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NAKAGAWA Keizo
Graduate School of Science, Technology and Innovation / Department of Science, Technology and Innovation
Associate Professor

Researcher basic information

■ Research Areas
  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Catalytic processes and resource chemistry
  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Transfer phenomena and unit operations
■ Committee History
  • Apr. 2024 - Present, 日本膜学会, 編集委員会, 委員
  • Mar. 2024 - Present, Kansai Branch, The Society of Chemical Engineers, Manager
  • Mar. 2023 - Present, 化学工学会, 反応工学部会触媒反応工学分科会, 会計担当
  • Mar. 2010 - Feb. 2024, 化学工学会, 反応工学部会若手会(反好会), 幹事
  • Mar. 2012 - Feb. 2023, 化学工学会, 反応工学部会触媒反応工学分科会, 幹事
  • Jan. 2021 - Dec. 2022, 化学工学会, 化学工学誌編集委員会, トピックス委員(触媒反応工学分科会)
  • Apr. 2018 - Mar. 2021, 文部科学省, 科学技術・学術政策研究所, 科学技術予測センター, 専門調査員
  • Apr. 2013 - Mar. 2016, 化学工学会, 中国四国支部若手の会, 幹事
  • May 2014 - May 2015, 触媒学会, 西日本支部, 幹事
  • Jul. 2010 - Jul. 2013, 化学工学会, 中国四国支部, public relations
  • Apr. 2012 - Mar. 2013, 石油学会, 中国四国支部, 庶務幹事

Research activity information

■ Award
  • Oct. 2024 国立大学法人 神戸大学, 令和6年度学長表彰(財務貢献者)
    中川 敬三

  • May 2018 The Japan Petroleum Institute, The Japan Petroleum Institute Award for Encouragement of Research and Development, Synthesis of metal oxide nanosheet catalysts by a bottom-up approach using surfactants
    NAKAGAWA KEIZO
    Japan society

  • Mar. 2018 The Society of Chemical Engineers, Japan, The SCEJ Service Award for Distinguished Service to the Society Activities, Remarkable Planning and Management by Young Researchers Contributed to Domestic and International Activities for Division of Chemical Reaction Engineering
    Takafumi HORIE, Keizo NAKAGAWA, Ryo WATANABE, Keita TANIYA
    Japan society

  • Mar. 2013 The Society of Chemical Engineers, Japan, The SCEJ Award for Outstanding Young Researcher, Improvement in the Catalytic Property of Metal Nanoparticles by Surface Covering
    NAKAGAWA KEIZO
    Japan society

■ Paper
  • Shinya Nishiyama, Naomichi Kimura, Yuri Ito, Tomoya Hirai, Keizo Nakagawa, Tomohisa Yoshioka
    Elsevier BV, Jan. 2025, Microporous and Mesoporous Materials, 381, 113332 - 113332, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Tomoki Watanabe, Miki Tabuchi, Muhammad Prayogie Aulia, Ralph Rolly Gonzales, Tooru Kitagawa, Yasunao Okamoto, Pengfei Zhang, Atsushi Matsuoka, Eiji Kamio, Tomohisa Yoshioka, Hideto Matsuyama
    Elsevier BV, Jan. 2025, Journal of Membrane Science, 713, 123309 - 123309, English
    [Refereed]
    Scientific journal

  • Ralph Rolly Gonzales, Keizo Nakagawa, Susumu Hasegawa, Kazuo Kumagai, Atsushi Matsuoka, Yasunao Okamoto, Zhan Li, Zhaohuan Mai, Tomohisa Yoshioka, Tomoyuki Hori, Hideto Matsuyama
    Corresponding, Elsevier BV, Jan. 2025, Separation and Purification Technology, 352, 128159 - 128159, English
    [Refereed]
    Scientific journal

  • Zheng Wang, Keizo Nakagawa, Kecheng Guan, Mengyang Hu, Zhaohuan Mai, Wenming Fu, Qin Shen, Yasunao Okamoto, Atsushi Matsuoka, Eiji Kamio, Tomohisa Yoshioka, Hideto Matsuyama
    Abstract Covalent organic networks (CONs) are considered ideal for precise molecular separation compared with traditional polymer membranes because their pores have a sharp molecular weight cut‐off and a robust structure. However, challenges remain with regard to tuning pores as a prerequisite for facile membrane fabrication to a defect‐free layer. Herein, a highly conjugated amino‐porphyrin is used and exploited its tunable stacking behavior to fabricate porphyrin‐based polyamide CONs with ordered structures through interfacial polymerization with acyl chlorides. Controlling the self‐aggregation behavior of the porphyrin and the conformation of the acyl chlorides can create different covalent networks. Acid‐triggered porphyrin protonation offsets stacking to reduce the pore in the network from mesopore to micropore, enabling selective molecule transport. Furthermore, different acyl chloride ligands are used to control the interlayer bonding in CONs. Accordingly, the tailored pore diameters (0.48–0.78 nm) are confirmed by the molecule rejections with performance stability over 25 days of operation, as well as under various conditions. This study leverages porphyrin chemistry and interfacial polymerization to fabricate a defect‐free CON layer with a significantly lower molecular weight cut‐off (< 330 Da) than previously reported porphyrin‐based membranes (>800 Da). This will pave the way for the development of ideal topological membranes.
    Corresponding, Wiley, Nov. 2024, Small, English
    [Refereed]
    Scientific journal

  • Shengnan He, Eiji Kamio, Atsushi Matsuoka, Keizo Nakagawa, Tomohisa Yoshioka, Hideto Matsuyama
    Elsevier BV, Nov. 2024, Journal of Membrane Science, 711, 123200 - 123200, English
    [Refereed]
    Scientific journal

  • Muhammad Prayogie Aulia, Ralph Rolly Gonzales, Miki Tabuchi, Tooru Kitagawa, Yasunao Okamoto, Pengfei Zhang, Nasrul Arahman, Tomohisa Yoshioka, Keizo Nakagawa, Hideto Matsuyama
    Corresponding, Elsevier BV, Oct. 2024, Journal of Membrane Science, 710, 123115 - 123115
    [Refereed]
    Scientific journal

  • Atsushi Matsuoka, Takefumi Miyake, Keizo Nakagawa, Tomohisa Yoshioka, Eiji Kamio, Hideto Matsuyama
    Elsevier BV, Oct. 2024, Journal of Membrane Science, 710, 123161 - 123161
    [Refereed]
    Scientific journal

  • Peter Sanciolo, Kana Moriguchi, Noel Dow, Fotios Sidiroglou, Tomohisa Yoshioka, Keizo Nakagawa, Mikel Duke
    Elsevier BV, Sep. 2024, Journal of Water Process Engineering, 66, 106018 - 106018, English
    [Refereed]
    Scientific journal

  • Jo Muroga, Eiji Kamio, Atsushi Matsuoka, Keizo Nakagawa, Tomohisa Yoshioka, Hideto Matsuyama
    Development of a tough gel membrane composed of Pebax 1657 and [Emim][C(CN)3] (Pebax ion gel membrane) with great CO2 separation performance.
    Royal Society of Chemistry (RSC), Jun. 2024, RSC Advances, 14(29) (29), 20786 - 20796, English
    [Refereed]
    Scientific journal

  • Takaya Fujiki, Megumi Kaji, Yuuya Tamamizu, Ryuuki Yasunari, Keizo Nakagawa, Tooru Kitagawa, Yasunao Okamoto, Atsushi Matsuoka, Eiji Kamio, Hideto Matsuyama, Tomohisa Yoshioka
    Elsevier BV, Jun. 2024, Separation and Purification Technology, 337, 126249 - 126249
    [Refereed]
    Scientific journal

  • Siyu Zhou, Kecheng Guan, Zhan Li, Ping Xu, Shang Fang, Aiwen Zhang, Zheng Wang, Shengnan He, Keizo Nakagawa, Hideto Matsuyama
    Abstract Chemically converted graphene oxide laminate membranes, which exhibit stable interlayered nanochannels in aqueous environments, are receiving increasing attention owing to their potential for selective water and ion permeation. However, how the molecular properties of conversion agents influence the stabilization of nanochannels and how effectively nanochannels are stabilized have rarely been studied. In this study, mono‐, di‐, and tri‐saccharide molecules of glucose (Glu), maltose (Glu2), and maltotriose (Glu3) are utilized, respectively, to chemically modify graphene oxide (GO). The aim is to create nanochannels with different levels of stability and investigate how these functional conversion agents affect the separation performance. The effects of the property differences between different conversion agents on nanochannel stabilization are demonstrated. An agent with efficient chemical reduction of GO and limited intercalation in the resulting nanochannel ensures satisfactory nanochannel stability during desalination. The stabilized membrane nanochannel exhibits a permeance of 0.69 L m−2 h−1 bar−1 and excellent Na2SO4 rejection of 96.42%. Furthermore, this optimized membrane nanochannel demonstrates enhanced stability under varying external conditions compared to the original GO. This study provides useful information for the design of chemical conversion agents for GO nanochannel stabilization and the development of nanochannel membranes for precise separation.
    Wiley, Apr. 2024, Small, English
    [Refereed]
    Scientific journal

  • Shengnan He, Eiji Kamio, Atsushi Matsuoka, Keizo Nakagawa, Tomohisa Yoshioka, Hideto Matsuyama
    Elsevier BV, Mar. 2024, Journal of Membrane Science, 695, 122482 - 122482, English
    [Refereed]
    Scientific journal

  • Yasuyuki Miyoshi, Yoshitomo Nakata, Tooru Kitagawa, Hideto Matsuyama, Tomohisa Yoshioka, Keizo Nakagawa
    American Chemical Society (ACS), Feb. 2024, Industrial & Engineering Chemistry Research, 63(9) (9), 4124 - 4133, English
    [Refereed]
    Scientific journal

  • Shunsuke Tanaka, Kojiro Fuku, Naoki Ikenaga, Maha Sharaf, Keizo Nakagawa
    Metal–organic frameworks (MOFs) represent the largest class of materials among crystalline porous materials ever developed, and have attracted attention as core materials for separation technology. Their extremely uniform pore aperture and nearly unlimited structural and chemical characteristics have attracted great interest and promise for applying MOFs to adsorptive and membrane-based separations. This paper reviews the recent research into and development of MOF membranes for gas separation. Strategies for polycrystalline membranes and mixed-matrix membranes are discussed, with a focus on separation systems involving hydrocarbon separation, CO2 capture, and H2 purification. Challenges to and opportunities for the industrial deployment of MOF membranes are also discussed, providing guidance for the design and fabrication of future high-performance membranes. The contributions of the underlying mechanism to separation performance and adopted strategies and membrane-processing technologies for breaking the selectivity/permeability trade-off are discussed.
    MDPI AG, Feb. 2024, Compounds, 4(1) (1), 141 - 171, English
    [Refereed]
    Scientific journal

  • Pengfei Zhang, Shang Xiang, Ralph Rolly Gonzales, Zhan Li, Yu-Hsuan Chiao, Kecheng Guan, Mengyang Hu, Ping Xu, Zhaohuan Mai, Saeid Rajabzadeh, Keizo Nakagawa, Hideto Matsuyama
    Elsevier BV, Feb. 2024, Journal of Membrane Science, 693, 122338 - 122338
    [Refereed]
    Scientific journal

  • Ryota Kumokita, Takahiro Bamba, Hisashi Yasueda, Ayato Tsukida, Keizo Nakagawa, Tooru Kitagawa, Tomohisa Yoshioka, Hideto Matsuyama, Yasuhito Yamamoto, Satoshi Maruyama, Takahiro Hayashi, Akihiko Kondo, Tomohisa Hasunuma
    Corresponding, Elsevier BV, Feb. 2024, Bioresource Technology, 393, 130144 - 130144, English
    [Refereed]
    Scientific journal

  • Siyu Zhou, Kecheng Guan, Shang Fang, Zheng Wang, Zhan Li, Ping Xu, Keizo Nakagawa, Ryosuke Takagi, Hideto Matsuyama
    Elsevier BV, Jan. 2024, Journal of Membrane Science, 689, 122185 - 122185, English
    [Refereed]
    Scientific journal

  • Atsushi Matsuoka, Masayuki Fukushima, Eiji Kamio, Tomohisa Yoshioka, Keizo Nakagawa, Yasunao Okamoto, Hideto Matsuyama
    American Chemical Society (ACS), Nov. 2023, Industrial & Engineering Chemistry Research, 62(46) (46), 19845 - 19854, English
    [Refereed]
    Scientific journal

  • Ralph Rolly Gonzales, Keizo Nakagawa, Kazuo Kumagai, Susumu Hasegawa, Atsushi Matsuoka, Zhan Li, Zhaohuan Mai, Tomohisa Yoshioka, Tomoyuki Hori, Hideto Matsuyama
    Corresponding, Elsevier BV, Nov. 2023, Water Research, 246, 120716 - 120716, English
    [Refereed]
    Scientific journal

  • Shengnan He, Eiji Kamio, Jinhui Zhang, Atsushi Matsuoka, Keizo Nakagawa, Tomohisa Yoshioka, Hideto Matsuyama
    Elsevier BV, Nov. 2023, Journal of Membrane Science, 685, 121912 - 121912, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Takumi Ueno, Zheng Wang, Tomohisa Yoshioka, Jiri Kulhavy, Keita Taniya, Atsushi Matsuoka, Eiji Kamio, Shik Chi Edman Tsang, Hideto Matsuyama
    Elsevier BV, Oct. 2023, Chemical Engineering Journal, 474, 145671 - 145671, English
    [Refereed]
    Scientific journal

  • Etsuko Tachi, Tomohisa Yoshioka, Takaya Fujiki, Ryuuki Yasunari, Keizo Nakagawa, Tooru Kitagawa, Yasunao Okamoto, Atsushi Matsuoka, Eiji Kamio, Hideto Matsuyama
    Elsevier BV, Oct. 2023, Separation and Purification Technology, 322, 124091 - 124091, English
    [Refereed]
    Scientific journal

  • Yusuke Yoshiwaka, Tooru Kitagawa, Takuji Shintani, Keizo Nakagawa, Tomohisa Yoshioka, Hideto Matsuyama
    Elsevier BV, Sep. 2023, Separation and Purification Technology, 320, 124150 - 124150, English
    [Refereed]
    Scientific journal

  • Shinya Nishiyama, Naomichi Kimura, Tomoya Hirai, Keizo Nakagawa, Tomohisa Yoshioka
    American Chemical Society (ACS), Aug. 2023, Industrial & Engineering Chemistry Research, 62(36) (36), 14611 - 14619, English
    [Refereed]
    Scientific journal

  • Atsushi Matsuoka, Airi Motoyama, Eiji Kamio, Tomohisa Yoshioka, Keizo Nakagawa, Hideto Matsuyama
    Elsevier BV, Aug. 2023, Journal of Molecular Liquids, 383, 122145 - 122145, English
    [Refereed]
    Scientific journal

  • Kecheng Guan, Zhaohuan Mai, Siyu Zhou, Shang Fang, Zhan Li, Ping Xu, Yu-Hsuan Chiao, Mengyang Hu, Pengfei Zhang, Guorong Xu, Keizo Nakagawa, Hideto Matsuyama
    American Chemical Society (ACS), Jun. 2023, Nano Letters, 23(13) (13), 6095 - 6101, English
    [Refereed]
    Scientific journal

  • Guohan Sun, Bo Yuan, Xinyu Wu, Shun Ying Lau, Linyuan Tian, Jung-Hoon Lee, Keizo Nakagawa, Yung-Kang Peng
    Urea pollution is a growing environmental concern, and its removal via catalytic hydrolysis is challenging due to the resonance-stabilized amide bonds. In nature, this reaction is catalyzed by ureases in many soil bacteria. However, the remedy of this problem with natural enzymes is not feasible as they are easily denatured and require high costs for both preparation and storage. Given this, the development of nanomaterials bearing enzyme-like activity (nanozymes) with advantages such as low production cost, simple storage, and pH/thermal stability has attracted much attention over the past decade. As inspired by the mechanism of urease-catalyzed urea hydrolysis, the co-presence of Lewis acid (LA) and Brønsted acid (BA) sites is imperative to proceed with this reaction. Herein, layered HNb3O8 samples with intrinsic BA sites were adopted for investigation. The layer reduction of this material to few-/single layers can expose Nb sites with various LA strengths depending on the degree of NbO6 distortion. Among the catalysts examined, single-layer HNb3O8 bearing strong LA and BA sites displays the best hydrolytic activity towards acetamide and urea. This sample with high thermal stability was found to outperform urease at temperatures higher than 50 °C. The acidity-activity correlation established in this study is believed to guide the future design of industrial catalysts to remediate urea pollution.
    Jun. 2023, Nanoscale, 15(22) (22), 9752 - 9758, English, International magazine
    [Refereed]
    Scientific journal

  • Shunsuke Kitamura, Tomohisa Yoshioka, Keizo Nakagawa, Tooru Kitagawa, Yasunao Okamoto, Atsushi Matsuoka, Eiji Kamio, Hideto Matsuyama
    Elsevier BV, Jun. 2023, Separation and Purification Technology, 315, 123576 - 123576, English
    [Refereed]
    Scientific journal

  • Zheng Wang, Keizo Nakagawa, Kecheng Guan, Qiangqiang Song, Siyu Zhou, Shunsuke Tanaka, Yasunao Okamoto, Atsushi Matsuoka, Eiji Kamio, Guangchao Li, Molly Meng-Jung Li, Tomohisa Yoshioka, Hideto Matsuyama
    Laminar membranes comprising graphene oxide (GO) and metal-organic framework (MOF) nanosheets benefit from the regular in-plane pores of MOF nanosheets and thus can support rapid water transport. However, the restacking and agglomeration of MOF nanosheets during typical vacuum filtration disturb the stacking of GO sheets, thus deteriorating the membrane selectivity. Therefore, to fabricate highly permeable MOF nanosheets/reduced GO (rGO) membranes, a two-step method is applied. First, using a facile solvothermal method, ZnO nanoparticles are introduced into the rGO laminate to stabilize and enlarge the interlayer spacing. Subsequently, the ZnO/rGO membrane is immersed in a solution of tetrakis(4-carboxyphenyl)porphyrin (H2 TCPP) to realize in situ transformation of ZnO into Zn-TCPP in the confined interlayer space of rGO. By optimizing the transformation time and mass loading of ZnO, the obtained Zn-TCPP/rGO laminar membrane exhibits preferential orientation of Zn-TCPP, which reduces the pathway tortuosity for small molecules. As a result, the composite membrane achieves a high water permeance of 19.0 L m-2  h-1  bar-1 and high anionic dye rejection (>99% for methyl blue).
    Corresponding, Apr. 2023, Small (Weinheim an der Bergstrasse, Germany), e2300672, English, International magazine
    [Refereed]
    Scientific journal

  • Tomoki Watanabe, Keizo Nakagawa, Ralph Rolly Gonzales, Tooru Kitagawa, Atsushi Matsuoka, Eiji Kamio, Tomohisa Yoshioka, Hideto Matsuyama
    Corresponding, Wiley, Mar. 2023, Journal of Applied Polymer Science, 140(22) (22), e53900, English
    [Refereed]
    Scientific journal

  • Kecheng Guan, Yanan Guo, Zhan Li, Yuandong Jia, Qin Shen, Keizo Nakagawa, Tomohisa Yoshioka, Gongping Liu, Wanqin Jin, Hideto Matsuyama
    Nanochannels in laminated graphene oxide nanosheets featuring confined mass transport have attracted interest in multiple research fields. The use of nanochannels for reverse osmosis is a prospect for developing next-generation synthetic water-treatment membranes. The robustness of nanochannels under high-pressure conditions is vital for effectively separating water and ions with sub-nanometer precision. Although several strategies have been developed to address this issue, the inconsistent response of nanochannels to external conditions used in membrane processes has rarely been investigated. In this study, we develop a robust interlayer channel by balancing the associated chemistry and confinement stability to exclude salt solutes. We build a series of membrane nanochannels with similar physical dimensions but different channel functionalities and reveal their divergent deformation behaviors under different conditions. The deformation constraint effectively endows the nanochannel with rapid deformation recovery and excellent ion exclusion performance under variable pressure conditions. This study can help understand the deformation behavior of two-dimensional nanochannels in pressure-driven membrane processes and develop strategies for the corresponding deformation constraints regarding the pore wall and interior.
    Feb. 2023, Nature communications, 14(1) (1), 1016 - 1016, English, International magazine
    [Refereed]
    Scientific journal

  • Ralph Rolly Gonzales, Keizo Nakagawa, Susumu Hasegawa, Atsushi Matsuoka, Kazuo Kumagai, Tomohisa Yoshioka, Hideto Matsuyama
    Corresponding, Elsevier BV, Jan. 2023, Journal of Membrane Science, 665, 121122 - 121122
    [Refereed]
    Scientific journal

  • Shota Takao, Saeid Rajabzadeh, Masahide Shibata, Chihiro Otsubo, Toyozo Hamada, Noriaki Kato, Keizo Nakagawa, Tooru Kitagawa, Hideto Matsuyama, Tomohisa Yoshioka
    For the first time, we have successfully fabricated microfiltration (MF) hollow fiber membranes by the thermally induced phase separation (TIPS) and non-solvent induced phase separation (NIPS) methods using cellulose acetate benzoate (CBzOH), which is a cellulose derivative with considerable chemical resistance. To obtain an appropriate CBzOH TIPS membrane, a comprehensive solvent screening was performed to choose the appropriate solvent to obtain a membrane with a porous structure. In parallel, the CBzOH membrane was prepared by the NIPS method to compare and evaluate the effect of membrane structure using the same polymer material. Prepared CBzOH membrane by TIPS method showed high porosity, pore size around 100 nm or larger and high pure water permeability (PWP) with slightly low rection performance compared to that by NIPS. On the contrary, CBzOH membranes prepared with the NIPS method showed three times lower PWP with higher rejection. The chemical resistance of the prepared CBzOH membranes was compared with that of cellulose triacetate (CTA) hollow fiber membrane, which is a typical cellulose derivative as a control membrane, using a 2000 ppm sodium hypochlorite (NaClO) solution. CBzOH membranes prepared with TIPS and NIPS methods showed considerable resistance against the NaClO solution regardless of the membrane structure, porosity and pore size. On the other hand, when the CTA membrane, as the control membrane, was subjected to the NaClO solution, membrane mechanical strength sharply decreased over the exposure time to NaClO. It is interesting that although the CBzOH TIPS membrane showed three times higher pure water permeability than other membranes with slightly lower rejection and considerably higher NaClO resistance, the mechanical strength of this membrane is more than two times higher than other membranes. While CBzOH samples showed no change in chemical structure and contact angle, CTA showed considerable change in chemical structure and a sharp decrease in contact angle after treatment with NaClO. Thus, CBzOH TIPS hollow fiber membrane is noticeably interesting considering membrane performance in terms of filtration performance, mechanical strength and chemical resistance on the cost of slightly losing rejection performance.
    MDPI, Dec. 2022, MEMBRANES, 12(12) (12), English
    [Refereed]
    Scientific journal

  • Yu Fujimura, Takahiro Kawakatsu, Masayuki Morimoto, Hitoshi Asakawa, Keizo Nakagawa, Tomohisa Yoshioka
    Elsevier BV, Dec. 2022, Journal of Molecular Liquids, 367, 120441 - 120441
    [Refereed]
    Scientific journal

  • Jinhui Zhang, Eiji Kamio, Atsushi Matsuoka, Keizo Nakagawa, Tomohisa Yoshioka, Hideto Matsuyama
    Elsevier BV, Dec. 2022, Journal of Membrane Science, 663, 121032 - 121032
    [Refereed]
    Scientific journal

  • Yu-Hsuan Chiao, Keizo Nakagawa, Mayu Matsuba, Masanao Okamoto, Takuji Shintani, Yuji Sasaki, Tomohisa Yoshioka, Eiji Kamio, S. Ranil Wickramasinghe, Hideto Matsuyama
    Corresponding, American Chemical Society (ACS), Oct. 2022, Industrial & Engineering Chemistry Research, 61(41) (41), 15345 - 15354, English
    [Refereed]
    Scientific journal

  • Atsushi Matsuoka, Shihomi Nishimori, Tomoki Takahashi, Eiji Kamio, Tomohisa Yoshioka, Keizo Nakagawa, Hideto Matsuyama
    Elsevier BV, Oct. 2022, Desalination, 540, 115991 - 115991
    [Refereed]
    Scientific journal

  • Shota Takao, Saeid Rajabzadeh, Chihiro Otsubo, Toyozo Hamada, Noriaki Kato, Keizo Nakagawa, Takuji Shintani, Hideto Matsuyama, Tomohisa Yoshioka
    For the first time, self-standing microfiltration (MF) hollow fiber membranes were prepared from cellulose triacetate (CTA) via the thermally induced phase separation (TIPS) method. The resultant membranes were compared with counterparts prepared from cellulose diacetate (CDA) and cellulose acetate propionate (CAP). Extensive solvent screening by considering the Hansen solubility parameters of the polymer and solvent, the polymer's solubility at high temperature, solidification of the polymer solution at low temperature, viscosity, and processability of the polymeric solution, is the most challenging issue for cellulose membrane preparation. Different phase separation mechanisms were identified for CTA, CDA, and CAP polymer solutions prepared using the screened solvents for membrane preparation. CTA solutions in binary organic solvents possessed the appropriate properties for membrane preparation via liquid-liquid phase separation, followed by a solid-liquid phase separation (polymer crystallization) mechanism. For the prepared CTA hollow fiber membranes, the maximum stress was 3-S times higher than those of the CDA and CAP membranes. The temperature gap between the cloud point and crystallization onset in the polymer solution plays a crucial role in membrane formation. All of the CTA, CDA, and CAP membranes had a very porous bulk structure with a pore size of similar to 100 nm or larger, as well as pores several hundred nanometers in size at the inner surface. Using an air gap distance of 0 mm, the appropriate organic solvents mixed in an optimized ratio, and a solvent for cellulose derivatives as the quench bath media, it was possible to obtain a CTA MF hollow fiber membrane with high pure water permeance and notably high rejection of 100 nm silica nanopartides. It is expected that these membranes can play a great role in pharmaceutical separation.
    AMER CHEMICAL SOC, Sep. 2022, ACS Omega, English
    [Refereed]
    Scientific journal

  • Ching Kit Tommy Wun, Ho Kit Mok, Tianxiang Chen, Tai-Sing Wu, Keita Taniya, Keizo Nakagawa, Sarah Day, Chiu C. Tang, Ziru Huang, Haibin Su, Wing-Yiu Yu, Terence Kin Wah Lee, Tsz Woon Benedict Lo
    Elsevier BV, Sep. 2022, Chem Catalysis, 2(9) (9), 2346 - 2363, English
    [Refereed]
    Scientific journal

  • Ryosuke Iesako, Tomohisa Yoshioka, Keizo Nakagawa, Takuji Shintani, Atsushi Matsuoka, Eiji Kamio, Hideto Matsuyama
    Elsevier BV, Sep. 2022, Separation and Purification Technology, 297, 121458 - 121458
    [Refereed]
    Scientific journal

  • Xuesong Yao, Kecheng Guan, Yuji Sasaki, Takuji Shintani, Keizo Nakagawa, Hideto Matsuyama
    A superwetting forward osmosis membrane was prepared by grafting a zwitterion (2-methacryloyloxyethyl phosphorylcholine, MPC) onto the polyamide membrane layer via atom transfer radical polymerization (ATRP) to enhance antifouling property. The modification of the hydrophilic layer was confirmed by the characterization including Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and contact angle goniometer. Moreover, membrane antifouling performance was evaluated by dynamic membrane fouling test using bovine-serum-albumin (BSA) and sodium alginate (SA). The grafted membranes not only showed high fouling resistance after being exposed to up to 500 ppm SA for 10 h, but also demonstrated excellent water flux recovery with the presence of up to 1000 ppm BSA, which was significantly improved as compared to the unmodified membrane. Robust hydration layer formed by the grafted zwitterion polymer could act as a physical and energy barrier preventing attachment of organic foulants on the membrane surface, thus significantly improving membrane fouling resistance.
    Aug. 2022, Journal of Applied Polymer Science, 139(30) (30)
    [Refereed]
    Scientific journal

  • Seiji Imoto, Keizo Nakagawa, Chechia Hu, Tomohisa Yoshioka, Takuji Shintani, Atsushi Matsuoka, Eiji Kamio, Takashi Tachikawa, Shik Chi Edman Tsang, Hideto Matsuyama
    A photocatalytic membrane for water treatment is required to have an efficient photocatalytic functions and high membrane performances, therefore, it is necessary to design a functional membrane structure that achieves both requirements. Herein, we describe two-dimensional material engineering on heterostructured nanochannels comprising graphitic carbon nitride (g-C3N4) and HNb3O8 nanosheets and demonstrate their potential water treatment applications based on their enhanced water permeance and photocatalytic degradation of organic compounds. Laminar HNb3O8/g-C3N4 composite membranes were fabricated by vacuum filtration. The incorporation of g-C3N4 into the HNb3O8 membrane led to an eight-fold improvement in the membrane's water permeance relative to that of the laminar HNb3O8 membrane, while maintaining high dye rejection performance. In addition, the HNb3O8/g-C3N4 composite membranes exhibited enhanced photocatalytic degradation of the cationic dye, rhodamine B, because of the formation of a heterojunction between g-C3N4 and HNb3O8 nanosheets with a suitable band-gap alignment. Furthermore, the permeance of an HNb3O8/g-C3N4 composite membrane could be completely restored via light irradiation after BSA fouling. Each type of nanosheet plays an important role as a membrane or photocatalyst component, thereby generating a synergistic effect based on the formation of two-dimensional heterostructured nanochannels in the photocatalytic nanosheet membrane.
    Corresponding, Elsevier {BV}, Aug. 2022, Chemical Engineering Journal, 442, 136254 - 136254, English
    [Refereed]
    Scientific journal

  • Ralph Rolly Gonzales, Takuji Shintani, Shunsuke Sunami, Yuji Sasaki, Keizo Nakagawa, Tomohisa Yoshioka, Hideto Matsuyama
    One process involved in biorefinery for generation of value-added products is fermentation. After fermentation, the downstream bioproduct purification process is conventionally performed by organic solvent extraction, which is environmentally-hazardous and costly. Membrane-based separation is a cost-efficient and environmentally-benign method for bioproduct separation and purification. In this study, a thin film composite (TFC) nanofiltration (NF) membrane was prepared and the pore size and charge of the polyamide layer were controlled by introducing iminodiacetic acid (IDA), a charged monoamine monomer, with piperazine (PIP) during interfacial polymerization (IP). The newly-developed NF membrane was found to have a molecular weight cut-off (MWCO) of 500 to 1350 Da, allowing the permeation of the fermentation product, while rejecting other higher molecular weight compounds. IDA addition in the aqueous amine solution during IP effectively engineered the MWCO values and pore sizes of TFC NF membranes for specific applications, such as separation of fermentation bioproducts. This study successfully showed that IDA reduced the diffusivity of PIP during IP, which negatively affected the polyamide formation and membrane performance. The optimal PIP:IDA concentration ratio was determined by MWCO and effective pore diameter for effective bioproduct separation and purification, which could not be performed by the current commercially-available NF membranes.
    Jul. 2022, Journal of Applied Polymer Science, 139(26) (26)
    [Refereed]
    Scientific journal

  • Kecheng Guan, Kai Ushio, Keizo Nakagawa, Takuji Shintani, Tomohisa Yoshioka, Atsushi Matsuoka, Eiji Kamio, Wanqin Jin, Hideto Matsuyama
    Corresponding, Elsevier BV, Jul. 2022, Journal of Membrane Science, 660, 120861 - 120861, English
    [Refereed]
    Scientific journal

  • Takahito Nakao, Shohei Goda, Yuki Miura, Masahiro Yasukawa, Miharu Ishibashi, Keizo Nakagawa, Takuji Shintani, Hideto Matsuyama, Tomohisa Yoshioka
    Osmotically assisted reverse osmosis (OARO) has been recently proposed for concentrating high-salinity brines. The long-term performance stability of the membrane is essential for OARO, considering the long-term commercial operation. In this study, we developed hollow fiber membranes for OARO operation made of cellulose triacetate, and elucidated the relationship between the membrane structure and resistance to compaction against long-term operation under high pressure at 7.0 MPa. The mechanical properties and the performance of membranes operated under reverse osmosis (RO) conditions were very well correlated with the long-term performances and dimensional stabilities of membranes operated under OARO conditions. Raman spectroscopy revealed the asymmetricity difference of the membranes before and after long-term operation. Finally, operation for more than 700 h under OARO conditions was performed using commercial-sized membrane modules, and this result was as expected based on results from laboratory-scale membrane modules. The membrane developed for higher compaction resistance retained 95% water permeance even after operation for 700 h. This study clearly showed a relationship between the resistance to compaction and the membrane structure, both of which are important for practical OARO operation.
    Corresponding, Elsevier {BV}, Jul. 2022, Journal of Membrane Science, 653, 120508 - 120508, English
    [Refereed]
    Scientific journal

  • Guohan Sun, Molly Meng-Jung Li, Keizo Nakagawa, Guangchao Li, Tai-Sing Wu, Yung-Kang Peng
    Elsevier {BV}, May 2022, Applied Catalysis B: Environmental, 313, 121461 - 121461, English
    [Refereed]
    Scientific journal

  • Xuesong Yao, Ralph Rolly Gonzales, Yuji Sasaki, Yuqing Lin, Qin Shen, Pengfei Zhang, Takuji Shintani, Keizo Nakagawa, Hideto Matsuyama
    Forward osmosis (FO) has attracted attention for wastewater treatment owing to its energy-saving characteristics; however, the low rejection of ammoniacal nitrogen (NH4+-N) for normal polyamide thin-film composite (TFC) FO membranes limits their practical applications for NH4+-N recovery or concentration from wastewater. Herein, ethylenediamine (EDA)- and 2-aminoethanol (AEA)-grafted TFC FO membranes were prepared to improve the NH4+-N rejection. EDA and AEA have similar molecular structures; however, their end groups differ. EDA has two primary amino groups, whereas AEA has one amino group and one hydroxy group. Both EDA- and AEA-grafted FO membranes significantly improved the NH4+-N rejection, and a further increase in NH4+-N rejection was noted (up to 97.5%) with increasing grafting times. These membranes showed high rejection, even at a feed solution with higher pH of 7.6 (89.7% and 83.0% for EDA- and AEA-grafted membranes, respectively). The carboxylic group density of the pristine and grafted membranes was measured to investigate the factors influencing the improvement in NH4+-N rejection. A significant correlation was found between the carboxylic group density and NH4+-N rejection, while the correlation between the surface zeta potential and NH4+-N rejection was unclear. This means not only positive charge chemical grafting can improve the NH4+-N rejection, but also the neutral chemical grafting can improve the NH4+-N rejection. It also indicates that reducing membrane surface carboxylic group density could alleviate cation exchange during FO process. This study clarified the factors influencing NH4+-N rejection and provided a novel idea for designing a FO membrane with high NH4+-N selectivity suitable for ammoniacal nitrogen concentration from wastewater.
    Elsevier {BV}, May 2022, Journal of Membrane Science, 650, 120429 - 120429, English
    [Refereed]
    Scientific journal

  • Jinhui Zhang, Eiji Kamio, Atsushi Matsuoka, Keizo Nakagawa, Tomohisa Yoshioka, Hideto Matsuyama
    American Chemical Society ({ACS}), Apr. 2022, Industrial & Engineering Chemistry Research, 61(13) (13), 4648 - 4658, English
    [Refereed]
    Scientific journal

  • Yu Fujimura, Takahiro Kawakatsu, Keizo Nakagawa, Takuji Shintani, Tomohisa Yoshioka
    Elsevier {BV}, Feb. 2022, Journal of Molecular Liquids, 347, 118366 - 118366, English
    [Refereed]
    Scientific journal

  • K.I. Ikrari, H. Hasbullah, W.N.W. Salleh, K. Nakagawa, T. Yoshioka
    Elsevier BV, 2022, Materials Today: Proceedings, 65, 3101 - 3108, English
    Scientific journal

  • Wataru Kushida, Ralph Rolly Gonzales, Takuji Shintani, Atsushi Matsuoka, Keizo Nakagawa, Tomohisa Yoshioka, Hideto Matsuyama
    Organic solvent reverse osmosis (OSRO) is currently considered as an energy-efficient membrane technology for separation of organic liquid mixtures.
    Royal Society of Chemistry ({RSC}), 2022, Journal of Materials Chemistry A, 10(8) (8), 4146 - 4156, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Misato Kunimatsu, Kengo Yasui, Tomohisa Yoshioka, Takuji Shintani, Eiji Kamio, Kuo Lun Tung, Shik Chi Edman Tsang, Hideto Matsuyama
    Organic solvent nanofiltration (OSN) is an energy-efficient alternative to distillation and evaporation for the separation of mixtures containing organic liquids. Laminar membranes using nanosheets as building blocks have great potential for OSN; however, a swelling of the interlayer spacing causes a severe decrease in the separation performance. Here, we present laminar HNb3O8-based composite membranes fabricated by vacuum filtration on an anodic aluminum oxide support for OSN applications. The laminar HNb3O8 membranes and composite (graphene oxide (GO) and HNb3O8) membranes were found to possess stable structures in various alcohols without severe swelling. As a result, the HNb3O8-based membranes showed higher dye rejections than the GO membrane. Among the HNb3O8-based membranes, the layered GO/HNb3O8 membrane had superior dye rejections in methanol (89.6% for Evans blue, 73.4% for acid red 265, and 43.4% for methyl orange) compared with the GO membranes. Alcohol permeation tests implied that the molecular diameter, rather than the solvent viscosity, was the dominant factor in the superior performance of the layered GO/HNb3O8 membrane. Molecular dynamics simulations suggest a stable GO/HNb3O8 interlayer ranging from around 1.165 to 1.333 nm, and a dense heterolayer formation at the interface between the HNb3O8 and GO layers. This heterolayer formation performs important roles in alcohol permeation and separation of organic dyes. Furthermore, the layered GO/HNb3O8 membrane showed stable permeation of a model photoresist waste liquid for 6 weeks and an excellent rejection of the photoresist waste, over 91%. We propose that laminar HNb3O8-based membranes have great potential for OSN applications.
    Dec. 2021, Journal of Membrane Science, 640, English
    [Refereed]
    Scientific journal

  • Takashi Ohkame, Kazushi Minegishi, Hideki Sugihara, Keizo Nakagawa, Takuji Shintani, Hideto Matsuyama, Tomohisa Yoshioka
    We report a new type of alkaline-stable hollow-fiber reverse osmosis (RO) membrane with an outside-in configuration that was established via adsorption of positively charged poly(vinyl alcohol) copolymers containing a small amount of quaternary ammonium moieties. Anionic sulfonated poly(arylene ether sulfone nitrile) hollow-fiber membranes were utilized as a substrate upon which the cationic copolymer layer was self-organized via electrostatic interaction. While the adsorption of the low-charge copolymer on the membrane support proceeded in a Layer-by-Layer (LbL) fashion, it was found that the adsorbed amount by one immersion step was enough to form a defect-free separation layer with a thickness of around 20 nm after cross-linking of vinyl alcohol units with glutaraldehyde. The resultant hollow-fiber membrane showed excellent desalination performances (NaCl rejection of 98.3% at 5 bar and 1500 mg/L), which is comparable with commercial low-pressure polyamide RO membranes, as well as good alkaline resistance. The separation performance could be restored by repeating the LbL treatment after alkaline degradation. Such features of LbL membranes may contribute to extending RO membrane lifetimes.
    MDPI, Dec. 2021, Membranes, 11(12) (12), English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Shintaro Araya, Kai Ushio, Misato Kunimatsu, Tomohisa Yoshioka, Takuji Shintani, Eiji Kamio, Kuo-Lun Tung, Hideto Matsuyama
    Two-dimensional (2D) laminar membranes are attracting much attention in organic solvent nanofiltration owing to the promising permeation and selective performance derived from their 2D ultrathin separation layer. However, owing to easy swelling (enlargement of interlayer spacing), controlling the interlayer spacing in organic solvents and stable solvent permeation are major issues for their application to organic solvent systems. In this study, laminar GO membranes were fabricated on a porous polyketone (PK) support membrane using triethanolamine (TEOA) as crosslinker (GO-TEOA/PK). The interlayer spacing (d) between GO sheets was characterized by X-ray diffraction. The TEOA crosslinker effectively suppressed swelling of the GO laminar structure. For GO-TEOA/PK, the variation in d corresponded well with the affinity between TEOA and each solvent, Ra(TEOA–solvent), as estimated using the Hansen solubility parameters. Furthermore, common linear correlation between the permeance of alcohols and the parameter combining affinity, viscosity, and equivalent molar diameter was clearly observed. Therefore, the affinity between crosslinker and solvent was an important factor in controlling interlayer spacing and solvent permeation in the laminar GO membranes containing crosslinker.
    Elsevier BV, Dec. 2021, Separation and Purification Technology, 276, 119279 - 119279, English
    [Refereed]
    Scientific journal

  • Eiji Kamio, Hiroki Kurisu, Tomoki Takahashi, Atsushi Matsuoka, Tomohisa Yoshioka, Keizo Nakagawa, Yuchen Sun, Hideto Matsuyama
    In this work, several types of ionic liquid (IL)-based thermosensitive draw solutions (DSs) were prepared for application in the forward osmosis (FO) process. The temperature dependence of the osmotic pressure of IL-based DS was investigated to examine the advantages of high-temperature membrane operation for regeneration and water recovery from the DS lean phase after liquid–liquid phase separation of DS with a lower critical solution temperature (LCST). From surface tension and dynamic light scattering measurements, it was found that the association of IL molecules and aggregation of IL associates occurred in hot water, which led to a decrease in the osmotic pressure of the IL-DS at elevated temperatures. The DS regeneration and water recovery using an RO membrane were examined using tetrabutylammonium 2,4,6-trimethylbenzenesulfonate with the largest temperature dependence on osmotic pressure. At elevated temperatures, the water flux and DS concentration in the concentrated solution increased effectively. The investigation demonstrated that high-temperature membrane operation is effective for the regeneration of LCST-type thermosensitive DS and water recovery.
    Elsevier BV, Nov. 2021, Separation and Purification Technology, 275, 119164 - 119164, English
    [Refereed]
    Scientific journal

  • Yuki Kawabata, Ralph Rolly Gonzales, Keizo Nakagawa, Takuji Shintani, Hideto Matsuyama, Yu Fujimura, Takahiro Kawakatsu, Tomohisa Yoshioka
    Reverse osmosis (RO) is a widely used energy-efficient separation technology for water treatment. Polyamide (PA) membranes are the conventional choice for this process. Fouling is a serious problem for RO separation. This issue leads to significant decreases in the water permeability of PA membranes, and it has yet to be fully elucidated. In particular, the fouling behavior of a nonionic substance on the negatively charged surface of a PA membrane in an aqueous environment has not been previously studied. In this work, the mechanisms of nonionic substances such as polyoxyethylene octyl ether (PE5) and maltose (Mal) were investigated using molecular dynamics (MD) simulations. In a PA membrane in which the carboxyl group was not dissociated, the hydrophobic portion of the membrane was exposed due to the localization of water molecules around the carboxyl groups in the PA membrane. This caused hydrophobic interaction with the hydrophobic groups of PE5. In the case of an amine-modified PA membrane containing no carboxyl groups, water was not localized around the functional group, and the water orientation of the polyamide surface was also low. Due to this membrane property, the presence of stabilized water around PE5 reduced the number of hydrophobic interactions. In similar manner, a PA membrane with a slightly dissociated carboxyl group was hydrophilic, which reduced the PE5 adsorption. The presence of many dissociated carboxyl groups, however, enhanced the adsorption of PE5 due to the increase in interactions between the dissociated carboxyl groups and the hydrophilic groups of PE5. Therefore, PE5 exhibited an amphipathic adsorption wherein both hydrophilic and hydrophobic groups contributed to adsorption onto the PA membrane. Mal, on the other hand, was highly stable in every aqueous environment independent of the state of the functional groups of the PA membrane, and was not easily affected by the properties of the PA membrane.
    Sep. 2021, Physical chemistry chemical physics : PCCP, English, International magazine
    [Refereed]
    Scientific journal

  • Jinhui Zhang, Eiji Kamio, Masayuki Kinoshita, Atsushi Matsuoka, Keizo Nakagawa, Tomohisa Yoshioka, Hideto Matsuyama
    An inorganic/organic micro-double-network (mu-DN) ion gel-based composite membrane with good mechanical properties and high CO2 permeance was developed in this study. The mu-DN ion gel was composed of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C(4)mim][Tf2N]), a cross-linked polymer network, and silica nanoparticle clusters. The mechanical strength of the mu-DN ion gel was optimized to achieve a fracture energy of 636 kJ/m(3). The fabricated composite membrane with an ion gel layer thickness of 4.5 mu m shows a CO2/N-2 permselectivity of 23 and a CO2 permeance of 119 GPU. The gas permeance of the composite membranes was calculated by considering a series of diffusion processes, and the results were in good agreement with the experimental data. The calculation results obtained using the proposed model show high potential of our mu-DN ion gel to achieve much higher CO2 permeance.
    AMER CHEMICAL SOC, Sep. 2021, INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 60(34) (34), 12698 - 12708, English
    [Refereed]
    Scientific journal

  • Jinhui Zhang, Eiji Kamio, Atsushi Matsuoka, Keizo Nakagawa, Tomohisa Yoshioka, Hideto Matsuyama
    A micro-double-network (mu-DN) ion gel membrane was fabricated using nonvolatile network precursors comprising a presynthesized cross-linkable polymer as the organic part, silica nanoparticles as the inorganic part, and 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C(4)mim][Tf2N]). The mechanical properties of the ion gel were effectively improved through optimizing the molecular weight of the cross-linkable polymer and the organic/inorganic network composition. The mu-DN ion gel membranes exhibited the CO2 permeability of approximately 920 Barrer under atmospheric pressure, which is much higher than those of the classic double-network ion gel membranes fabricated using volatile network precursors (556 Barrer) and the supported ionic liquid membranes (617 Barrer). The membrane also has good pressure resistance and long-term stability. The mu-DN ion gel membrane formed by nonvolatile network precursors shows good mechanical properties and high CO2 separation performance, which make it a good candidate base material for developing high-permeance thin ion gel membranes.
    AMER CHEMICAL SOC, Sep. 2021, INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 60(34) (34), 12640 - 12649, English
    [Refereed]
    Scientific journal

  • Hao-Chen Wu, Tomohisa Yoshioka, Keizo Nakagawa, Takuji Shintani, Hideto Matsuyama
    The use of an Amphotericin B_Ergosterol (AmBEr) channel as an artificial water channel in forward osmosis filtration (FO) was studied via molecular dynamics (MD) simulation. Three channel models were constructed: a common AmBEr channel and two modified C3deOAmB_Ergosterol (C3deOAmBEr) channels with different diameters (12 Å and 18 Å). During FO filtration simulation, the osmotic pressure of salt-water was a driving force for water permeation. We examined the effect of the modified C3deOAmBEr channel on the water transport performance. By tracing the change of the number of water molecules along with simulation time in the saltwater region, the water permeability of the channel models could be calculated. A higher water permeability was observed for a modified C3deOAmBEr channel, and there was no ion permeation during the entire simulation period. The hydrated ions and water molecules were placed into the channel to explore the ion leakage behavior of the channels. The mean squared displacement (MSD) of ions and water molecules was obtained to study the ion leakage performance. The Amphotericin B-based channels showed excellent selectivity of water molecules against ions. The results obtained on an atomistic scale could assist in determining the properties and the optimal filtration applications for Amphotericin B-based channels.
    Aug. 2021, Membranes, 11(9) (9)
    [Refereed]
    Scientific journal

  • Takahito Nakao, Mayumi Akashi, Miharu Ishibashi, Miyuki Yao, Keizo Nakagawa, Takuji Shintani, Hideto Matsuyama, Tomohisa Yoshioka
    Observing the nanoporous structure inside membranes has been one of the greatest challenges in membrane research, and many recent studies have employed positron annihilation lifetime spectroscopy, among other methods, to gain structural insights. In this report, we demonstrate the significant potential of Raman spectroscopy for investigating the nanoporous structure inside membranes under in situ conditions. Sulfonated poly(arylene ether sulfone) and cellulose triacetate asymmetric hollow fiber membranes were fabricated and their nanoporous structures were examined using Raman spectroscopy. The membrane dimensions, mechanical properties, and reverse osmosis (RO) performances were also measured. The membrane structures estimated by Raman spectroscopy correlated very well with the mechanical properties and RO performances. This study indicated that Raman spectroscopy represents a promising method for detecting the nanoporous structures inside membranes for desalination applications, and furthermore, that it would be a good tool for developing membranes with optimized nanoporous structures.
    Corresponding, Elsevier BV, Aug. 2021, Journal of Membrane Science, 631, 119337 - 119337, English
    [Refereed]
    Scientific journal

  • Takashi Ohkame, Masafumi Shibuya, Keizo Nakagawa, Takuji Shintani, Hideto Matsuyama, Tomohisa Yoshioka
    A new method for the preparation of chemically robust thin-film composite hollow-fiber (TFC-HF) nanofiltration membranes through a dip-coating process is reported. A negatively charged disulfonated poly(arylene ether sulfone) random copolymer (SPN-20) containing highly polar benzonitrile groups was utilized as a separation layer in a TFC-HF membrane. Only four polar aprotic solvents, N-methyl-2-pyrrolidone (NMP), dimethyl acetamide (DMAc), dimethyl formamide (DMF), and dimethyl sulfoxide (DMSO), proved to be good solvents for SPN-20 possibly due to its rigid chemical backbone and strong intermolecular interactions. In order to avoid dissolution or irreversible swelling of the polymeric supports in the dip-coating process, a polyphenylene oxide (PPO) hollow-fiber membrane was introduced as a novel substrate for TFC-HF fabrications. Solubility investigation using a framework of Hansen solubility parameters (HSPs) revealed that the PPO membrane is a suitable substrate for coating the SPN-20 copolymer due to its tolerance of polar aprotic solvents. By using DMSO as a coating solvent for the SPN-20 copolymer, TFC-HF membranes were successfully prepared with neither dissolution nor any damage to PPO supports. The dip-coating and drying processes were analyzed in detail to optimize the thickness and separation performance of TFC-HF membranes. The resultant membranes showed excellent rejection of Na2SO4 (>98%) and an almost 100% rejection of negatively charged dyes along with a reasonable level of pure water flux (1.0–10.3 [L∙m−2∙h−1∙bar−1]).
    Elsevier BV, Aug. 2021, Journal of Membrane Science, 631, 119336 - 119336, English
    [Refereed]
    Scientific journal

  • Eiji Kamio, Hiroki Kurisu, Tomoki Takahashi, Atsushi Matsuoka, Tomohisa Yoshioka, Keizo Nakagawa, Hideto Matsuyama
    Forward osmosis (FO) membrane process is expected to realize energy-saving seawater desalination. To this end, energy-saving water recovery from a draw solution (DS) and effective DS regeneration are essential. Recently, thermo-responsive DSs have been developed to realize energy-saving water recovery and DS regeneration. We previously reported that high-temperature reverse osmosis (RO) treatment was effective in recovering water from a thermo-responsive ionic liquid (IL)-based DS. In this study, to confirm the advantages of the high-temperature RO operation, thermo-sensitive IL-based DS was treated by an RO membrane at temperatures higher than the lower critical solution temperature (LCST) of the DS. Tetrabutylammonium 2,4,6-trimethylbenznenesulfonate ([N4444 ][TMBS]) with an LCST of 58◦C was used as the DS. The high-temperature RO treatment was conducted at 60◦C above the LCST using the [N4444 ][TMBS]-based DS-lean phase after phase separation. Because the [N4444 ][TMBS]-based DS has a significantly temperature-dependent osmotic pressure, the DS-lean phase can be concentrated to an osmotic pressure higher than that of seawater at room temperature (20◦C). In addition, water can be effectively recovered from the DS-lean phase until the DS concentration increased to 40 wt%, and the final DS concentration reached 70 wt%. From the results, the advantages of RO treatment of the thermo-responsive DS at temperatures higher than the LCST were confirmed.
    Jul. 2021, Membranes, 11(8) (8), 588, English
    [Refereed]
    Scientific journal

  • Hu, C., Tsai, W.-F., Wei, W.-H., Andrew Lin, K.-Y., Liu, M.-T., Nakagawa, K.
    Elsevier BV, Apr. 2021, Carbon, 175, 467 - 477, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Misato Kunimatsu, Kengo Yasui, Tomohisa Yoshioka, Takuji Shintani, Tomoki Yasui, Eiji Kamio, Wei-Song Hung, Kueir-Rarn Lee, Shik Chi Edman Tsang, Hideto Matsuyama
    Supplementary Journal Cover
    American Chemical Society (ACS), Mar. 2021, ACS Applied Nano Materials, 4(4) (4), 3455 - 3466, English, International magazine, Co-authored internationally
    [Refereed]
    Scientific journal

  • Takashi Tachibana, Tomohisa Yoshioka, Keizo Nakagawa, Takuji Shintani, Eiji Kamio, Hideto Matsuyama
    Methyl gallate (MG) and ethyl ferulate (EF) with a benzene ring were separately used as aromatic organic chelating ligands (aOCLs) to prepare two versions of TiO2-ZrO2-aOCL composite sols via hydrolysis and polycondensation reactions with titanium(IV) isopropoxide (Ti(OC3H7)4) and zirconium(IV) butoxide (Zr(OC4H9)4). Thermogravimetric and FT-IR analysis of dry gels revealed that aromatic rings were present in the residual organic matter when the gel was fired under nitrogen at 300 °C. In X-ray diffraction (XRD) measurements, the TiO2-ZrO2 composite material prepared using these two aOCLs showed an amorphous structure with no crystalline peaks for TiO2 and ZrO2. In N2 adsorption/desorption measurements at 77 K, the TiO2-ZrO2 samples using the aOCLs as a template appeared porous with a larger specific surface area than TiO2-ZrO2 without aOCL. TiO2-ZrO2-aOCL composite membranes were prepared by coating and firing TiO2-ZrO2-aOCL sol onto a SiO2 intermediate layer using an α-alumina porous tube as a substrate. Compared with the TiO2-ZrO2 membrane, the TiO2-ZrO2-aOCL membranes had higher gas permselectivity. The TiO2-ZrO2-EF membrane showed a He permeance of 2.69 × 10-6 mol m-2 s-1 Pa-1 with permeance ratios of He/N2 = 10.6 and He/CF4 = 163, while the TiO2-ZrO2-MG membrane revealed a bit less He permeance at 8.56 × 10-7 mol m-2 s-1 Pa-1 with greater permeance ratios of He/N2 = 61.7 and He/CF4 = 209 at 200 °C. A microporous TiO2-ZrO2 amorphous structure was obtained by introducing aOCL. The differences in the side chains of each aOCL could possibly account for the differences in the microporous structures of the resultant TiO2-ZrO2-aOCL membranes.
    Dec. 2020, Membranes, 10(12) (12), English, International magazine
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Kiyohito Uchida, Jiang Ling Chuan Wu, Takuji Shintani, Tomohisa Yoshioka, Yuji Sasaki, Li-Feng Fang, Eiji Kamio, Ho Kyong Shon, Hideto Matsuyama
    In this study, we fabricated porous polyketone (PK) support membranes with high pressure resistance and low structural parameter (S) by surface modification with aromatic compounds for osmotically driven membrane process applications. The effects of surface modification of PK using aromatic compounds on the membrane structure, mechanical properties, and membrane performance were investigated. Based on an estimation of the affinity between PK and aromatic compounds using Hansen solubility parameters and mechanical properties, m-phenylenediamine (MPD) was selected as an appropriate chemical modifier for PK membranes. The PK support membranes modified with MPD (PK-MPD) had a dense structure on the bottom side. The thickness and porosity of the PK membranes were changed by the treatment temperature. As a result, polyamide (PA)/PK-MPD thin film composite membranes showed superior pressure resistance in reverse osmosis. PA/PK-MPD modified at 110 °C possessed the highest pressure resistance of 21 bar, which was 3.5 times higher than that of the PA/untreated PK membrane, while maintaining a high water flux of 19.4 L m−2 h−1 in FO. This performance overcame the trade-off relationships between pressure resistance and FO flux and between pressure resistance and S value.
    Elsevier BV, Nov. 2020, Separation and Purification Technology, 251, 117400 - 117400
    [Refereed]
    Scientific journal

  • Lara Loske, Keizo Nakagawa, Tomohisa Yoshioka, Hideto Matsuyama
    In this study, the characteristics of different types of nanosheet membranes were reviewed in order to determine which possessed the optimum propensity for antifouling during water purification. Despite the tremendous amount of attention that nanosheets have received in recent years, their use to render membranes that are resistant to fouling has seldom been investigated. This work is the first to summarize the abilities of nanosheet membranes to alleviate the effect of organic and inorganic foulants during water treatment. In contrast to other publications, single nanosheets, or in combination with other nanomaterials, were considered to be nanostructures. Herein, a broad range of materials beyond graphene-based nanomaterials is discussed. The types of nanohybrid membranes considered in the present work include conventional mixed matrix membranes, stacked membranes, and thin-film nanocomposite membranes. These membranes combine the benefits of both inorganic and organic materials, and their respective drawbacks are addressed herein. The antifouling strategies of nanohybrid membranes were divided into passive and active categories. Nanosheets were employed in order to induce fouling resistance via increased hydrophilicity and photocatalysis. The antifouling properties that are displayed by two-dimensional (2D) nanocomposite membranes also are examined.
    Corresponding, MDPI AG, Oct. 2020, Membranes, 10(10) (10), 295 - 295, English
    [Refereed][Invited]
    Scientific journal

  • Youhei Yabuno, Kota Mihara, Naoki Miyagawa, Kensaku Komatsu, Keizo Nakagawa, Takuji Shintani, Hideto Matsuyama, Tomohisa Yoshioka
    © 2020 Elsevier B.V. Poly(vinylidene difluoride) (PVDF) hollow fiber membranes were prepared by using high-temperature rapid non-solvent-induced phase separation (HTR-NIPS). The conditions for fabricating interconnected bicontinuous structures via HTR-NIPS were investigated. We found that (1) the stock solution must not have a gelation temperature and (2) the membrane must be produced at an outer coagulation solution temperature higher than the upper critical solution temperature of the stock solution. A stock solution of PVDF/γ-butyrolactone/poly(vinylpyrrolidone) that satisfied these conditions was used for successful fabrication of PVDF membranes with a well-developed interconnected bicontinuous structure. The pure water permeances and strengths of these PVDF membranes were higher than those of previously reported PVDF membranes. A polyamide (PA) active layer was prepared on the PVDF hollow fiber membranes via interfacial polymerization to obtain PA-PVDF. Investigation of forward osmosis (FO) in the active layer facing the feed solution showed that the water flux Jw increased with decreasing thickness of the support layer. Higher water transport was achieved when the tortuosity τ, estimated from the S value, was lower. This suggests that the interconnected bicontinuous structure of the PVDF membrane is a key factor for FO membranes.
    Oct. 2020, Journal of Membrane Science, 612
    [Refereed]
    Scientific journal

  • Shingo Hikita, Takuji Shintani, Keizo Nakagawa, Hideto Matsuyama, Tomohisa Yoshioka
    © 2020 Elsevier B.V. An amphiphilic copolymer was used in the fabrication of hydrophilized poly (vinylidene fluoride) (PVDF) membranes. The amphiphilic copolymer was synthesized via the catalytic chain transfer radical polymerization (CCTP) of poly (methyl methacrylate) macromonomer (PMMA-MM), 2-hydroxyethyl methacrylate (HEMA), and 2-methoxyethyl acrylate (MEA). The copolymer, PMMA-co-P (HEMA-co-MEA) with various copolymerization ratios of HEMA and MEA was added to a stock solution containing PVDF, poly (vinylpyrrolidone) (PVP) and N,N-Dimethylacetamide (DMAc) in the preparation of hollow-fiber membranes via the non-solvent induction phase separation (NIPS) method. The resultant membrane had various porous structures and hydrophilicity. The permeability of the resultant membrane tended to be higher when a copolymer with a lower HEMA copolymerization ratio was added. The membrane was prepared using a copolymer with a high composition ratio of HEMA and had a structure that featured a smaller pore diameter and less connectivity in the inner surface, which reduced the water permeability. Amphiphilic copolymers would interfere with the formation of membrane structure. On the other hand, the surface hydrophilicity was better than that of a blank PVDF membrane, which revealed an interesting trade-off between hydrophilicity and water permeability.
    Oct. 2020, Journal of Membrane Science, 612
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Norihiro Togo, Ryosuke Takagi, Takuji Shintani, Tomohisa Yoshioka, Eiji Kamio, Hideto Matsuyama
    Reverse osmosis (RO) is commonly used to concentrate solutions in food preparation and environmental applications among others. Limitations on the applied pressure, which must be higher than the osmotic pressure of the feed solution, determine the concentration that can be achieved by RO. Recently, an osmotically assisted reverse osmosis (OARO) system that can be operated even with low applied pressure has been suggested as a new concentration process. In this study, we performed concentration tests on a multistage OARO system that used two types of hollow fiber (HF) membrane modules made from cellulose triacetate with different numbers of HFs. Water permeated through the membrane and the concentration increased as it progressed through the modules, even when using concentrated NaCl solutions (1.0 and 2.0 M) with low applied pressures (10 and 15 bar). The concentration increased in each of ten stages in a multistage concentration test. Water flux and concentration ratio were strongly influenced by the internal concentration polarization in the modules.
    Elsevier BV, Oct. 2020, Chemical Engineering Research and Design, 162, 117 - 124
    [Refereed]
    Scientific journal

  • Atsushi Matsuoka, Eiji Kamio, Tomohisa Yoshioka, Keizo Nakagawa, Hideto Matsuyama
    Elsevier BV, Oct. 2020, Separation and Purification Technology, 248, 117018 - 117018
    [Refereed]
    Scientific journal

  • Tong Yang Hsu, Tse Chiang Huang, Jun Hung Chou, Yi Feng Lin, Keizo Nakagawa, Tomohisa Yoshioka, Hideto Matsuyama, Hui Hsin Tseng, Kuo Lun Tung
    © 1973-2012 IEEE. This study presents two 3-D atmospheric plasma spray models, namely, internal and external powder injections, by using the computational fluid dynamics technique to study the status of the melting of a particle and its in-flight velocity during a porous ceramic layer fabrication process. A bulk fluid model, which solves the time-dependent standard k-ϵ model, is used in combination with a Lagrangian to track the trajectories of alumina particles. The results of the fluid-analytical models are compared with experimental measurements, and it is seen that the spray angle increases as the flow rate of the carrier gas increases, which is more significant for an internal than for an external powder injector. Internal powder injection gives a particle a greater in-flight velocity and particle surface temperature because of the location of the powder injector. It is seen that the particle injection velocity and the particle penetration depth vary with the particle size and the flow rate of the carrier gas and that the dispersion for the internal type is more concentrated than that for the external type because of the momentum. The surrounding setup also plays an important role in the process of plasma spraying.
    Aug. 2020, IEEE Transactions on Plasma Science, 48(8) (8), 2759 - 2767
    [Refereed]
    Scientific journal

  • Geng-Sheng Lin, Yu-Cheng Liu, Ramasamy Anbarasan, Keizo Nakagawa, Tomohisa Yoshioka, Hideto Matsuyama, Hui-Hsin Tseng, Kuo-Lun Tung
    Atmospheric plasma spraying (APS) of silicon carbide (SiC) is a challenging task due to the severe decomposition behaviour of the SiC. Previous studies, which utilized APS technique, mixed SiC powder with metals and/or metal oxides to prepare SiC coating. None of them sprayed silica gel-coated SiC and examined the characteristics of the coatings. In this work, silica gel-coated SiC, sodium dodecyl sulfate (SDS) enhanced silica gel-coated SiC, and the combination of alumina (Al2O3) and SiC were prepared and then deposited onto a titanium (Ti) plate by APS. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), adhesion and acid resistance test were performed to analyse the characteristics of modified powders and coatings. We found that compared to Commercial-SiC coatings, all the modified SiC coatings not only increase the coating thickness but also enhance the adhesion force between the coating and substrate; furthermore, the SDS-modified sample exhibits good sulfuric acid (H2SO4) resistance. On the other hand, samples containing Al2O3 showed a significant increase in coating thickness and adhesion force, despite a bit lower acid resistance. In sum, we believe that compared to silica-gel coated samples, Al2O3 contained samples are more suitable for industrial application. (C) 2020 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
    ELSEVIER, May 2020, JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS, 110, 173 - 181, English
    [Refereed]
    Scientific journal

  • Chih-Chen Yeh, Keizo Nakagawa, Yung Chang, Chechia Hu
    In the present study, thrombocytes, erythrocytes, and leukocytes were individually brought into contact with different immobilized blood proteins on the surface of polystyrene (PS), which was modified with a poly(styrene)-b-poly(acrylic acid) copolymer. When the concentration of fibronectin was greater than 5 μg mL-1, the attachment of erythrocytes increased, which indicated that the modified PS surface was less compatible with erythrocytes. In addition, vitronectin and laminin attached on the surface increased the adhesion of thrombocytes; higher adhesion was observed for leukocytes in the cases of fibrinogen, lysozyme, and laminin. Interestingly, adhesion properties of blood cells on the protein surface could be influenced by the addition of metal oxide- and carbon-based photocatalysts. After a photocatalytic treatment by metal oxide-based TiO2, the adhesion amounts of erythrocytes improved slightly, whereas the adhesion of leukocytes and thrombocytes decreased after treatment with a carbon-based g-C3N4 nanosheet. Our results suggested that the surface modification of the substrate through photocatalysis using various photocatalysts along with the grafting of the poly(styrene)-b-poly(acrylic acid) copolymer could be a promising approach to alternatively control the blood compatibility on the protein surface.
    Mar. 2020, Langmuir : the ACS journal of surfaces and colloids, 36(12) (12), 3268 - 3275, English, International magazine
    [Refereed]

  • Misato Kunimatsu, Keizo Nakagawa, Tomohisa Yoshioka, Takuji Shintani, Tomoki Yasui, Eiji Kamio, Shik Chi Edman Tsang, Jianxin Li, Hideto Matsuyama
    Membranes assembled by two-dimensional (2D) nanosheets have high potential for advanced molecular separation. The intercalation of nanomaterials into the laminar membrane is a promising strategy to control the nanochannel structure. We present 2D niobate nanosheet (NbN)-Graphene oxide (GO) composite membranes fabricated by simple vacuum filtration. The effect of the weight ratio of NbN/GO on the membrane structures and performances is investigated. The NbN-rich membranes have a more stable structure in the wet condition and a membrane structure with a larger channel size compared with GO-rich membranes. Especially, NbN55-GO45 (weight ratio of NbN/GO = 55/45) shows a superior water permeability of 20 L m−2 h−1 bar−1, which is around 6 times higher than an NbN membrane (NbN100) and 2 times higher than a GO membrane (GO100), while maintaining good rejection abilities of an anionic dye (nearly 100% for Evans blue) and salt (60% for Na2SO4). Different models for the water pathway through nanochannels can be classified according to the composite ratio of the NbN-GO membranes.
    Corresponding, Elsevier BV, Feb. 2020, Journal of Membrane Science, 595, 117598 - 117598
    [Refereed]
    Scientific journal

  • Kamio, E., Tanaka, M., Shirono, Y., Keun, Y., Moghadam, F., Yoshioka, T., Nakagawa, K., Matsuyama, H.
    2020, Industrial and Engineering Chemistry Research, 59(5) (5)
    [Refereed]
    Scientific journal

  • Shintani, T., Akamatsu, K., Hamada, S., Nakagawa, K., Matsuyama, H., Yoshioka, T.
    2020, Separation and Purification Technology, 239
    [Refereed]
    Scientific journal

  • Yuki Sada, Tomohisa Yoshioka, Keizo Nakagawa, Takuji Shintani, Ryosuke Iesako, Eiji Kamio, Hideto Matsuyama
    Organic chelate ligand (OCL)-templated TiO2-ZrO2 nanofiltration membranes were fabricated. Three types of OLCs, isoeugenol (ISOH), 2,3-dihydroxynaphthalene (DHN), and ethyl acetoacetate (EAA) were examined for use in the preparation of a TiO2-ZrO2 thin separation layer. All employed OCLs were completely decomposed and removed with firing at 500 degrees C under air, but OCL-templated TiO2-ZrO2 composite materials maintained their amorphous structure after firing. ISOH- and DHN-templated TiO2-ZrO2 composite powder samples were more microporous with a higher BET specific surface area than ordinary pure TiO2-ZrO2 composite material without OCL. On the other hand, EAA-templated TiO2-ZrO2 had a less-microporous structure similar to that of non-templated TiO2-ZrO2 powder. The average pore sizes of ISOH-, DHN-, and EAA-templated membranes were 2.0, 2.0, and 1.4 nm, respectively, while that of a non-templated TiO2-ZrO2 membrane was 1.4 nm. ISOH and DHN were more effective as an OCL for changing the characteristics of ordinary TiO2-ZrO2 composite materials. The molecular weight cut-off (MWCO) of OCL-templated TiO2-ZrO2 membranes was 600-1000 g/mol, and water permeability was 3.7-11.41/(m(2) h bar) (LMH/bar). OCLs could be useful for improvements in the water permeability of porous ceramic membranes that retain their solute rejection or separation characteristics.
    ELSEVIER, Dec. 2019, JOURNAL OF MEMBRANE SCIENCE, 591, English
    [Refereed]
    Scientific journal

  • Hao-Chen Wu, Tomohisa Yoshioka, Keizo Nakagawa, Takuji Shintani, Daisuke Saeki, Hideto Matsuyama
    Molecular simulation was adopted to investigate and compare the water-channel performance of a common Amphotericin B_Ergosterol (AmBEr) model with that of two hydrophobically modified Amphotericin B_Ergosterol (C3deOAmBEr) models. Structural characteristics and transport performances were also examined. The energy levels of the simulation models were explored to determine the stability of each channel. The hydrogen bonds between the Amphotericin B monomers and the water molecules within each channel illustrated the affinity of the channel water. Molecular dynamics (MD) and Monte Carlo (MC) methods were adopted to investigate the diffusion and sorption behaviors of the water molecule transport performance, respectively. Furthermore, the effect of modification was studied to reveal the features of the modified channel simulation model. In the case of the modified C3deOAmBEr model, the results indicated that modification led to hydrophobic properties in the channel. Although modification reduced the attractive forces and led to lower adsorbability within the channel, the special structure of the Amphotericin B monomer showed interesting results. In the case of the modified model, the hydrophilic entrance of the channel contributed to the attraction of water molecules, which facilitated a high level of water permeability. The MD and MC simulation methods enabled an illustration of the properties and performance on a microscopic level.
    ELSEVIER SCIENCE BV, Aug. 2019, JOURNAL OF MEMBRANE SCIENCE, 583, 49 - 58, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Tomohiro Sera, Misato Kunimatsu, Hiroharu Yamashita, Tomohisa Yoshioka, Takuji Shintani, Eiji Kamio, Shik Chi Edman Tsang, Hideto Matsuyama
    Niobate nanosheet membranes were fabricated by vacuum filtration using niobate nanosheets prepared by the hydrothermal method (HT-NbO membranes) and the exfoliation method (EX-NbO membranes). Membrane structure, water permeance and separation performance for these membrane types were measured and compared. Both membrane types had a dense structure and retained high structural stability in water via chemical cross-linking between sheets. The difference of the intercalated molecules and interaction between nanosheets affected the interlayer distance of the membranes. As a result, higher water permeance but lower rejection of polyethylene glycol, Na2SO4 and Acid Red 265 was observed for EX-NbO membranes than for HT-NbO membranes. This is due to the formation of larger nanochannels in EX-NbO membranes. A model of a water pathway through nanochannels based on void structure proposed for the HT-NbO membranes can also be applied for EX-NbO membranes.
    Elsevier BV, Jul. 2019, Separation and Purification Technology, 219, 222 - 229
    [Refereed]
    Scientific journal

  • Norihiro Togo, Keizo Nakagawa, Takuji Shintani, Tomohisa Yoshioka, Tomoki Takahashi, Eiji Kamio, Hideto Matsuyama
    Solution concentration processes such as evaporation, freeze concentration, and reverse osmosis are commonly used in food processing and environmental applications. However, these processes are frequently examined to lower energy costs and improve concentration ratios. This study performed concentration tests and theoretical calculations for osmotically assisted reverse osmosis (OARO) using a pilot-scale hollow-fiber membrane module. In the concentration test using NaCl solution, water flux and concentration ratio were measured with changing flow rate, concentration, and applied pressure. Water permeation and solution concentration were achieved, even using concentrated salt solutions (0.5 and 1.0 M), with applied pressure of 8-12 bar, which was lower than the osmotic pressure (25 bar for 0.5 M NaCl; 50 bar for 1.0 M NaCl). The calculation results were in good agreement with the experimental results, and the validity of the calculation model was confirmed. Analysis revealed that the concentration gradient and concentration polarization in the module changed with operating conditions, and these factors affected the water flux and the concentration ratio.
    Corresponding, American Chemical Society (ACS), Apr. 2019, Industrial & Engineering Chemistry Research, 58(16) (16), 6721 - 6729
    [Refereed]
    Scientific journal

  • Dubois, Vincent, Desmecht, Didier, Rkiouak, Laylla, Jacquet, Anne-Sophie, Hoshinoo, Tomoya, Nakagawa, Keizo, Hermans, Sophie
    2019, Reaction Kinetics Mechanisms and Catalysis, 126(1) (1), 399 - 415
    [Refereed]
    Scientific journal

  • Haynes, Tommy, Ersen, Ovidiu, Dubois, Vincent, Desmecht, Didier, Nakagawa, Keizo, Hermans, Sophie
    2019, Applied Catalysis B-Environmental, 241, 196 - 204
    [Refereed]
    Scientific journal

  • Yabuno, Y., Mihara, K., Komatsu, K., Shimamura, S., Nakagawa, K., Shintani, T., Matsuyama, H., Yoshioka, T.
    2019, Industrial and Engineering Chemistry Research, 58(47) (47)
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Shintaro Araya, Misato Kunimatsu, Tomohisa Yoshioka, Takuji Shintani, Eiji Kamio, Hideto Matsuyama
    Two-dimensional (2D) nanosheets show promise for the development of water treatment membranes with extraordinary separation properties and the advantages of atomic thickness with micrometer-sized lateral dimensions. Stacked graphene oxide (GO)-based membranes can demonstrate unique molecular sieving properties with fast water permeation. However, improvements to the structural stability of the membranes in water to avoid problems such as swelling, disruption of the ordered GO layer and decreased rejection are crucial issues. This study reports the fabrication of stacked GO nanosheet membranes by simple vacuum filtration using triethanolamine (TEOA) as a crosslinker and mild reducing agent for improved structural stability and membrane performance. Results show that GO membranes modified with TEOA (GO-TEOA membranes) have a higher structural stability in water than unmodified GO membranes, resulting in improved salt rejection performance. Furthermore, GO-TEOA membranes show stable water permeance at applied pressures up to 9 bar with Na2SO4 rejection of 85%, suggesting the potential benefits for water treatment applications.
    MDPI, Dec. 2018, MEMBRANES, 8(4) (4), English
    [Refereed]
    Scientific journal

  • Tomohisa Yoshioka, Keisuke Kotaka, Keizo Nakagawa, Takuji Shintani, Hao-Chen Wu, Hideto Matsuyama, Yu Fujimura, Takahiro Kawakatsu
    Polyamide (PA) membranes possess properties that allow for selective water permeation and salt rejection, and these are widely used for reverse osmotic (RO) desalination of sea water to produce drinking water. In order to design high-performance RO membranes with high levels of water permeability and salt rejection, an understanding of microscopic PA membrane structures is indispensable, and this includes water transport and ion rejection mechanisms on a molecular scale. In this study, two types of virtual PA membranes with different structures and densities were constructed on a computer, and water molecular transport properties through PA membranes were examined on a molecular level via direct reverse/forward osmosis (RO/FO) filtration molecular dynamics (MD) simulations. A quasi-non-equilibrium MD simulation technique that uses applied (RO mode) or osmotic (FO mode) pressure differences of several MPa was conducted to estimate water permeability through PA membranes. A simple NVT (Number, Volume, and Temperature constant ensemble)-RO MD simulation method was presented and verified. The simulations of RO and FO water permeability for a dense PA membrane model without a support layer agreed with the experimental value in the RO mode. This PA membrane completely rejected Na+ and Cl- ions during a simulation time of several nano-seconds. The naturally dense PA structure showed excellent ion rejection. The effect that the void size of PA structure exerted on water permeability was also examined.
    MDPI, Dec. 2018, MEMBRANES, 8(4) (4), English
    [Refereed]
    Scientific journal

  • Yihan Zhang, Keizo Nakagawa, Masafumi Shibuya, Kengo Sasaki, Tomoki Takahashi, Takuji Shintani, Tomohisa Yoshioka, Eiji Kamio, Akihiko Kondo, Hideto Matsuyama
    The hydrothermal pretreatment of rice straw generates a liquid fraction that contains low concentrations of sugars, as well as fermentation inhibitors which are not favourable for efficient bioethanol production. For the development of a forward osmosis (FO) process to concentrate sugars and remove fermentation inhibitors, we fabricated polyamide-polysulfone (PA-PSf) membranes treated with NaClO solution. The NaClO treatment improved the water permeability (A value) and the permselectivity of fermentation inhibitors against sugars. Maximum separation of xylose from furfural and acetic acid was achieved when the treated membranes had A values of 5.5-7 L m(-2) h(-1) bar(-1). Using an optimized membrane with A value of approximately 6 L m(-2) h(-1) bar(-1), a liquid fraction from hydrothermally pretreated rice straw was concentrated in a one-step FO process to increase sugar concentrations and decrease fermentation inhibitor concentrations. The ethanol concentration and yield (ethanol/total sugar) by xylose-utilizing Saccharomyces cerevisiae reached 18.0 g/L and 0.40, respectively, which were much higher than those obtained with commercial FO membranes. These results clearly indicate the possibility of introducing a simple and low-cost FO process into bioethanol production from lignocellulosic biomass by incorporating NaClO treatment to FO membrane.
    Corresponding, ELSEVIER SCIENCE BV, Nov. 2018, JOURNAL OF MEMBRANE SCIENCE, 566, 15 - 24, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Yuka Arai, Yosuke Umezaki, Akira Yoshida, Yasuko Kajiwara, Satoka Aoyagi, Hideto Matsuyama, Shigeru Sugiyama
    Hydroxyapatite nanostructures with various shapes have been prepared by phosphate surfactant self-assembly in aqueous solution. The hydroxyapatite structure is greatly influenced by the sodium dodecyl phosphate (SDP) concentration. X-ray diffraction, transmission electron microscopy measurements, thermogravimetric analysis, and Fourier transform infrared spectra were performed to investigate the nanostructures. Spindle-type nanoparticles formed by oriented attachment of hydroxyapatite nanocrystals were obtained with low SDP concentration, whereas rod-shaped and sheet-like nanostructures formed in the two-dimensional water phase of the lamellar structure with high SDP concentration. These results indicate that SDP molecules play a critical role in formation of hydroxyapatite nanostructures.
    Elsevier Ltd, Jul. 2018, Materials Chemistry and Physics, 213, 183 - 190, English
    [Refereed]
    Scientific journal

  • Hao-Chen Wu, Tomohisa Yoshioka, Keizo Nakagawa, Takuji Shintani, Toshinori Tsuru, Daisuke Saeki, Abdul Rajjak Shaikh, Hideto Matsuyama
    In this study, molecular simulation was used to explore the structural characteristics and water transport performance of Amphotericin B-Brgosterol (AmBEr) channels. A molecular dynamics (MD) technique was used to construct two types of molecular models of AmBEr channels: single-layer channel (SLC) and double-layer channel (DLC). A MD simulation was used to illustrate the differences between SLC and DLC AmBEr models with respect to structure, channel diameter, interior affinity, and transportation behavior of water molecules. A Monte Carlo (MC) method was adopted to investigate the sorption behavior in these two types of AmBEr channels. The intramolecular properties and intermolecular interactions indicated the feasibility of the simple model construction method adopted in this study. The internal diameter and channel shape showed that the use of funnel-type AmBEr channels would lead to high levels of permeability and selectivity. The special tunnel shape was reflected in the diffusion calculation that resulted in a high displacement of water molecules in two types of channel models. The water molecule-channel hydrogen bond distribution and snapshot analyses of the adsorption site revealed an affinity between the amphotericin B monomer and water molecules. The novel chemical structure of the amphotericin B monomer features simultaneous hydrophilic and hydrophobic segments. This particular structural characteristic was reflected in the unique shape of the water adsorption isotherm curves, which show a unique three-step increase in equilibrated water pressure. In transport prediction, two AmBEr models had similar permeability values but different water transport mechanisms. Concisely, fabrication of the artificial water channel would help to enhance the water permeability in the water transport process. The results from the simulation provided valuable information for structural characterization and in estimating the transport behavior of the molecules in the AmBEr channels.
    ELSEVIER SCIENCE BV, Jan. 2018, JOURNAL OF MEMBRANE SCIENCE, 545, 229 - 239, English
    [Refereed]
    Scientific journal

  • Hao-Chen Wu, Tomohisa Yoshioka, Keizo Nakagawa, Takuji Shintani, Toshinori Tsuru, Daisuke Saeki, Hideto Matsuyama
    The Membrane Society of Japan, Jan. 2018, Membrane, 42(6) (6), 250 - 254, English
    [Refereed]
    Scientific journal

  • Hao-Chen Wu, Tomohisa Yoshioka, Keizo Nakagawa, Takuji Shintani, Toshinori Tsuru, Daisuke Saeki, Yi-Rui Chen, Kuo-Lun Tung, Hideto Matsuyama
    In this study, the transport performance of water molecules and the ion-rejection ability of cyclic peptide nanotubes (CPNTs) were examined on a molecular level via a simulation of forward osmosis (FO) filtration phenomena. A FO filtration model and three types of CPNTs, 8CP, Mba-8CP, and 4Mba-8CP (with different levels of modification by hydrophobic functional groups), were constructed via molecular dynamics (MD). MD simulation was adopted to explain the diversity transport mechanism between different types of CPNTs, and to analyze how hydrophobic modified functional groups affect the FO filtration process. The hydration structures of cations and anions were validated via radial distribution function (RDF) and hydration analysis. The interaction energy of van der Waals (vdW) and coulombic energies at the interface between water molecules and the first cyclic peptide cage suggested that hydrophobic modified functional groups reduced the interior affinity between water molecules and nanotubes, which made it difficult for water molecules to enter a nanotube. During FO filtration calculation, the alteration in the number of water molecules in each region of saltwater, pure water and membrane was traced and recorded. The osmotic pressure was considered as the driving force for concentration driven FO process which was calculated via the Van't Hoff equation in this work. By combining the above results, water permeabilities of the three types of CPNTs could be directly calculated and compared. The results of the water permeabilities agreed well with the interaction energy analysis. Finally, the hydration structure of cations within a nanotube was used to directly study the ion rejection mechanism of CPNTs. Three types of CPNTs showed high selectively between water molecules and ions. The partial charge distribution of a cyclic peptide cage illustrated how cations are trapped within nanotubes. A microscopic view of this information was informative in the analysis of nanotube properties and in the application of CPNTs to the filtration process.
    ELSEVIER SCIENCE BV, Dec. 2017, DESALINATION, 424, 85 - 94, English
    [Refereed]
    Scientific journal

  • Hannah T. Kreissl, Molly M. J. Li, Yung-Kang Peng, Keizo Nakagawa, Thomas J. N. Hooper, John V. Hanna, Ashley Shepherd, Tai-Sing Wu, Yun-Liang Soo, S. C. Edman Tsang
    Hydrated niobium oxides are used as strong solid acids with a wide variety of catalytic applications, yet the correlations between structure and acidity remain unclear. New insights into the structural features giving rise to Lewis and Bronsted acid sites are presently achieved. It appears that Lewis acid sites can arise from lower coordinate NbO5 and in some cases NbO4 sites, which are due to the formation of oxygen vacancies in thin and flexible NbO6 systems. Such structural flexibility of Nb-O systems is particularly pronounced in high surface area nanostructured materials, including few-layer to monolayer or mesoporous Nb2O5 center dot nH(2)O synthesized in the presence of stabilizers. Bulk materials on the other hand only possess a few acid sites due to lower surface areas and structural rigidity: small numbers of Bronsted acid sites on HNb3O8 arise from a protonic structure due to the water content, whereas no acid sites are detected for anhydrous crystalline H-Nb2O5.
    AMER CHEMICAL SOC, Sep. 2017, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 139(36) (36), 12670 - 12680, English
    [Refereed]
    Scientific journal

  • K. Nakagawa, H. Yamashita, D. Saeki, T. Yoshioka, T. Shintani, E. Kamio, H. T. Kreissl, S. C. E. Tsang, S. Sugiyama, H. Matsuyama
    Niobate nanosheets are assembled into thin membranes by a vacuum filtration. The nanosheet membranes have a dense and stable structure in water via chemical cross-linking and showhigher permeance and salt rejection compared with graphene oxide membranes. A water pathway model based on the void structure is presented to explain the membrane performances.
    ROYAL SOC CHEMISTRY, Jul. 2017, CHEMICAL COMMUNICATIONS, 53(56) (56), 7929 - 7932, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Yoshiki Tezuka, Takuya Ohshima, Megumi Katayama, Toshimasa Ogata, Ken-Ichiro Sotowa, Masahiro Katoh, Sigeru Sugiyama
    Cerium carbonate hydroxide nanostructures composed of nanoparticles were synthesized using amine surfactant in hydrothermal solution. The nanostructures of the obtained samples were greatly influenced by laurylamine (LA) concentration. The shape of nanostructures of the cerium carbonate hydroxide was maintained after thermal decomposition to CeO2. A formation strategy is proposed by self-assembly of nanoparticles through surfactant-assisted approach. The obtained CeO2 nanostructures possess rod-like shape, large pore volumes and high surface areas in synthesis condition of high LA concentration even after thermal treatment at 550 degrees C. Owing to their unique nanostructure composed of nanoparticles, improved catalytic soot oxidation at lower temperature was achieved as compared with CeO2 synthesized without surfactant and CeO2 rod crystals synthesized by a conventional hydrothermal method. (C) 2016 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
    ELSEVIER SCIENCE BV, Sep. 2016, ADVANCED POWDER TECHNOLOGY, 27(5) (5), 2128 - 2135, English
    [Refereed]
    Scientific journal

  • Hannah Theresa Kreissl, Keizo Nakagawa, Yung-Kang Peng, Yusuke Koito, Junlin Zheng, Shik Chi Edman Tsang
    The conversion of sugars to 5-hydroxymethylfurfural (HMF) over solid acids in water represents an environmentally and separation-friendly route to an important platform molecule. In particular, the conversion of sucrose attracts increasing attention because it is cheaper and more widely available than glucose and fructose. Sucrose can undergo rapid hydrolysis to the two monosaccharides, however conversion mechanisms and interactions with solid acids remain unclear. Here, it is shown that niobium oxides possess Bronsted acid (BA) and Lewis acid (LA) sites of tunable quantity and strength, dependent on their structure and morphology. By systematically studying these acid catalysts, it is revealed for the first time that both acid type and strength are significant for the sugar conversion: Fructose reaction is catalyzed by BA, with weaker BA sites being more selective toward HMF. Glucose conversion to HMF involves an additional isomerization step to fructose, which can be catalyzed by both LA and strong BA but LA is more efficient. Sucrose is shown to be easily hydrolyzed into glucose and fructose under the reaction conditions and HMF is formed from the further conversion of the two sugars. It is demonstrated that mesoporous niobium oxide gives the highest HMF yield for sucrose conversion among all niobium oxides due to balanced BA and LA sites with appropriate acid strengths. (C) 2016 Elsevier Inc. All rights reserved.
    ACADEMIC PRESS INC ELSEVIER SCIENCE, Jun. 2016, JOURNAL OF CATALYSIS, 338, 329 - 339, English
    [Refereed]
    Scientific journal

  • Masahiro Katoh, Ayaka Satoh, Toshihide Horikawa, Keizo Nakagawa, Shigeru Sugiyama
    Three kinds of ZSM-5 (MFI structure) zeolites [SiO2/Al2O3 = 23.8 (Na form), 39.0 (NH4 form) and 193(NH4 form)] were alkali-treated, and the changes in structural and water adsorptive properties were investigated. With the alkali treatment, the MFI structure was preserved; a siliceous species was selectively dissolved from the framework of a zeolite, and mesopores were created in the zeolites. At the same time, NH4-form ZSM-5 zeolites (SiO2/Al2O3 = 39.0 and 193) were ion-exchanged to form Na in an aqueous solution of NaOH. In particular, for ZSM-5 (SiO2/Al2O3 = 23.8), the water adsorption changed with the alkali treatment. The difference in the amount of adsorbed water on the zeolite between 30 degrees C (adsorption temperature) and 100 degrees C (desorption temperature) increased by the treatment. The desorption temperature of water adsorbed at the stronger site decreased from 106 to 72 degrees C with the alkali treatment. These results indicate that the introduction of mesopores in ZSM-5 contributed to the enhanced water adsorption.
    SOC CHEMICAL ENG JAPAN, Feb. 2016, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 49(2) (2), 120 - 125, English
    [Refereed]
    Scientific journal

  • Shigeru Sugiyama, Ryuta Kitora, Haruka Kinoshita, Keizo Nakagawa, Masahiro Katoh, Kiyohiko Nakasaki
    To recover phosphorus from composted chicken manure, a batch method with aqueous HNO3, HCl and H2SO4 was used to examine the elution behavior of the aqueous calcium and phosphate contained in the manure. Since the main components in manure are Ca2+ and K+ along with PO43- and those ions can be dissolved using an acidic eluate, it was expected that most of the aqueous Ca2+, K+ and PO43- could be obtained via the elution. Therefore, it seemed plausible that the removal of the aqueous K+ obtained by the elution of composted chicken manure would result in the formation of calcium phosphates. If calcium phosphates are formed, they can be used for phosphate rock, which also consists of various calcium phosphates. When using 0.1 mol/L HNO3, HCl or H2SO4, the elution behavior of the PO43- was not dependent on the acids. However, 0.1 mol/L H2SO4 was not sufficient for the elution of Ca2+, probably due to the precipitation of the calcium sulfate. The eluted amount of K+ using 0.1 mol/L HNO3 was lower than that using 0.1 mol/L of either HCl or H2SO4. Since the poor elution of K+ should enrich the concentrations of Ca2+ and PO43- in the acidic aqueous solution after the elution, it was suggested that aqueous HNO3 would be suitable as an eluate in the present system. After the elution of the composted chicken manure, when 0.1 mol/L HNO3 was used to adjust the solution pH of the acidic aqueous solution to greater than 6, Ca2+ and PO43- were precipitated, but K+ was not. The precipitate was calcium hydroxyapatite, one of the typical components of phosphate rock, which showed that composted chicken manure could be replaced phosphate rock as a new source of phosphorus.
    SOC CHEMICAL ENG JAPAN, Feb. 2016, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 49(2) (2), 224 - 228, English
    [Refereed]
    Scientific journal

  • Takuya Ehiro, Ai Itagaki, Hisanobu Misu, Masashi Kurashina, Keizo Nakagawa, Masahiro Katoh, Yuuki Katou, Wataru Ninomiya, Shigeru Sugiyama
    MCM-41 (#41 Mobil Composition of Matter) is a favorable material for heterogeneous reactions because of its unique porous structure. However, the catalytic activity of MCM-41 for the oxidative dehydrogenation (ODH) of isobutane to isobutene is known to be quite low. In the present study, a metal-doping method was employed to improve this catalytic activity. Doping of Cr, Co, Ni, or Mo into MCM-41 resulted in a great improvement in the catalytic activity. Since chromium-doped MCM-41 (Cr-MCM-41) showed the greatest catalytic activity among these catalysts, its redox property was further analyzed via XPS, XAFS and H-2-TPR techniques. The XPS spectrum of Cr-MCM-41 suggested that it has Cr3+ and Cr6+ species on its surface. Also, a pre-edge peak due to Cr6+ species was confirmed in the XANES spectrum of Cr-MCM-41. In H-2-TPR measurement, Cr-MCM-41 was more reducible than crystalline Cr2O3, which showed low catalytic activity for the ODH of isobutane. The reducible Cr6+ species on Cr-MCM-41 contributed to an improvement in the catalytic activity of MCM-41.
    SOC CHEMICAL ENG JAPAN, Feb. 2016, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 49(2) (2), 136 - 143, English
    [Refereed]
    Scientific journal

  • Naotaka Ohtake, Yoshiki Yamane, Keizo Nakagawa, Masahiro Katoh, Shigeru Sugiyama
    Morphological control can be used to improve the catalytic activity of cerium oxide (ceria, CeO2). In this study, ceria with a high specific surface area was synthesized via the hydrothermal reaction of ceric nitrate and was tested for the catalytic conversion of ethanol to ethylene. As a reference, ceria was also synthesized via a precipitation reaction of cerous nitrate using aqueous ammonia. The Japan reference catalyst JRC-CEO-1 also served as a reference. The specific surface area of the hydrothermally synthesized ceria was as high as that of JRC-CEO-1, but was much higher than that of either reference after calcination at 873 K. Thermogravimetric analysis and IR spectroscopy revealed that the cerias made by hydrothermal and precipitation reactions consisted of high-purity CeO2, whereas JRC-CEO-1 contained 1.5% decomposable functional groups (OH-, CO32-). For both ethanol conversion and ethylene selectivity in a catalytic dehydration reaction of ethanol, the activity of the hydrothermally developed ceria was higher than that for either reference. The reaction pathway for the dehydration reaction of ethanol over ceria showed that the specific surface area and the basicity of the Lewis basic sites of the ceria were influential properties. The high catalytic activity of the hydrothermally synthesized ceria was derived from its high specific surface area and high-purity CeO2.
    SOC CHEMICAL ENG JAPAN, Feb. 2016, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 49(2) (2), 197 - 203, English
    [Refereed]
    Scientific journal

  • Takuya Ehiro, Ai Itagaki, Hisanobu Misu, Keizo Nakagawa, Masahiro Katoh, Yuuki Katou, Wataru Ninomiya, Shigeru Sugiyama
    Mesoporous silicas have shown promise as materials for solid catalysts or catalyst supports due to their unique characteristics. Metal-doped mesoporous silicas are known to be catalytically active in the oxidative dehydrogenation (ODH) of isobutane. However, heavy-metal-free mesoporous silicas have not been studied closely for their use as catalysts. In the present study, MCM-41 (#41 Mobil composition of matter) was acid-treated to enhance its catalytic activity, although pure MCM-41 was confirmed as catalytically inactive for the ODH of isobutane (isobutene yield = 0.9%). The pH of a slurry of as-synthesized MCM-41 was changed during acid treatment. A pH adjustment to 6.5 resulted in great improvement in catalytic activity (isobutene yield = 6.1%), but a pH adjustment to 4.5 resulted in insufficient improvement (isobutene yield = 4.5%). It was confirmed via XRD and N-2 adsorption-desorption measurement that the pH adjustment to 4.5 degraded the ordered structure of MCM-41. This degradation would be a crucial factor that would render acid treatment less effective. In addition to the acid treatment, Al doping to MCM-41 was conducted. Al doping also greatly enhanced the acidity and catalytic activity of MCM-41.
    SOC CHEMICAL ENG JAPAN, Feb. 2016, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 49(2) (2), 152 - 160, English
    [Refereed]
    Scientific journal

  • Takuya Ehiro, Ai Itagaki, Masashi Kurashina, Masahiro Katoh, Keizo Nakagawa, Yuuki Katou, Wataru Ninomiya, Shigeru Sugiyama
    The template ion exchange of chromium cations into FSM-16 (#16 Folded Sheets Mesoporous Materials) for 247 h resulted in a 2.89 wt% incorporation of those cations into the FSM-16, although only a 0.3 wt% incorporation had previously been reported. The XRD pattern of the resultant solid (Cr-FSM-16) showed that the hexagonal structure characteristic of FSM-16 remained after the 2.89 wt% incorporation of chromium cations. XPS could be used to detect the Cr3+ and Cr6+ species on the surface of Cr-FSM-16. A pre-edge peak that was due to a tetrahedrally coordinated Cr6+ species was confirmed in the XANES spectrum of the Cr-FSM-16, which showed that the coordination state around some Cr species was similar to that around the Si species in FSM-16. With the increase in the amount of chromium cations in FSM-16, its catalytic activity and stability during the oxidative dehydrogenation of isobutane were evidently improved. (C) 2015 The Ceramic Society of Japan. All rights reserved.
    CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI, Dec. 2015, JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 123(1444) (1444), 1084 - 1089, English
    [Refereed]
    Scientific journal

  • Masahiro Katoh, Michisato Kimura, Mao Sugino, Toshihide Horikawa, Keizo Nakagawa, Shigeru Sugiyama
    By using NaY zeolites as desiccant materials, commercial NaY zeolite was alkali treated with 1 M NaOH aqueous solution and then Mg2+ ion-exchanged by 0.5 M Mg(NO3)(2) aqueous solution. Alkali treatment (AT) of NaY zeolite removed silicon atoms selectivity from the framework of Y-type zeolite and enhanced water diffusivity of Y-type zeolite. On the other hand, Mg2+ ion-exchange of NaY zeolite increased the amount of water adsorbed. Prepared Y-AT-Mg zeolite had both water adsorption velocity and a large difference of water adsorbed amount between adsorption at 30 degrees C and desorption at 100 degrees C. (C) 2015 Elsevier Inc. All rights reserved.
    ACADEMIC PRESS INC ELSEVIER SCIENCE, Oct. 2015, JOURNAL OF COLLOID AND INTERFACE SCIENCE, 455, 220 - 225, English
    [Refereed]
    Scientific journal

  • Ichiro Mihara, Keizo Nakagawa, Masahiro Kudo, Satoka Aoyagi
    The evaluation of nanostructure is important to develop the highly controlled nanomaterials. In this study, two kinds of layered titanate nanosheets, which were produced by using hexylamine and laurylamine, respectively, as surfactants were investigated by Gentle Secondary Ion Mass Spectrometry Gentle-SIMS (G-SIMS) and g-ogram, which is the latest Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS) data analysis method for detecting more intact ions and obtaining the information on original chemical structures of samples precisely from complicated TOF-SIMS spectra. As a result, molecular related ions of the surfactants were detected from each sample, and the structural information of samples was obtained. From both samples, surfactant molecular ions connected with hydrocarbon were detected as more intact ions rather than molecular ions of themselves. It was suggested that hydrophobic domains of their lamellar mesostructure are formed robustly by more than two surfactant molecules connected with each other linearly. After all, important information on the chemical structure of the layered titanate nanosheets, which would be difficult to be found by using typical structural analysis methods such as X-ray diffraction and transmission electron microscopy, were obtained using G-SIMS and g-ogram. Therefore, it was shown that g-ogram and G-SIMS are helpful to evaluate the nanostructured materials. And it was also shown that g-ogram is applicable to organic-inorganic materials which contain long hydrocarbon structures. Copyright (c) 2015 John Wiley & Sons, Ltd.
    WILEY-BLACKWELL, Jul. 2015, SURFACE AND INTERFACE ANALYSIS, 47(7) (7), 764 - 770, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Takuya Ohshima, Yoshiki Tezuka, Megumi Katayama, Masahiro Katoh, Sigeru Sugiyama
    Rod and ellipsoid shaped CeO2 nanostructures were prepared using self-assemblies of amine surfactants as templates through the decomposition of cerium carbonate hydroxide. The morphologies of the products were greatly influenced by amine surfactants with different alkyl chain lengths. Different shaped CeO2 nanostructures supported CuO (CuO/CeO2) catalysts were prepared by a conventional impregnation method. CuO/CeO2 nanorods showed high reducibility at lower temperature, larger amount of oxygen species from H2-TPR and possessed larger external surface area and mesopore volume from N2 adsorption as compared with CuO/CeO2 with uncontrolled morphology. These catalysts showed effective soot combustion at lower temperature under tight contact condition using carbon black (CB) as a model of soot particle, as compared with CuO/CeO2 with uncontrolled morphology. Larger external surface area and mesopore volume of CuO/CeO2 catalysts contributed to the improved physical contact condition between CeO2 catalysts and aggregated CBs. Surface reducibility and the improved physical contact condition affected greatly their catalytic activity for soot combustion. (C) 2014 Elsevier B.V. All rights reserved.
    ELSEVIER SCIENCE BV, May 2015, CATALYSIS TODAY, 246, 67 - 71, English
    [Refereed]
    Scientific journal

  • Shigeru Sugiyama, Yasuhiro Okada, Yoshiki Yamane, Takuya Ehiro, Keizo Nakagawa, Masahiro Katoh, Yuuki Katou, Shuji Akihara, Toshiya Yasukawa, Wataru Ninomiya
    We have earlier showed how the catalytic conversion of 1,2-propandiol to propanal using FSM-16 (#16 folded sheets of mesoporous materials) when molded by wet treatment proceeded more favorably than when using FSM-16 molded by pressurization, while no comparison using other typical acidic catalysts and no examination of the acidic properties of FSM-16 was carried out. In the present study, the conversion using FSM-16 molded by wet treatment and pressurization was compared with that obtained by using typical acidic catalysts such as SiW12O40/SiO2 and MCM-41 (#41 of Mobil Composition of Matter) together with amorphous SiO2. Among these catalysts, FSM-16 molded by wet treatment showed the most suitable catalytic activity. In order to examine the effect of the molding procedure for FSM-16 on its structural and acidic properties, FSM-16 molded by both methods was examined using NH3-TPD, in situ FT-IR using NH3 as a probe molecule, and Hammett indicators together with XRD and TEM. According to Zaitsev's rule, the present conversion should afford acetone rather than propanal, which indicates that it would proceed via hydro cracking. Therefore, the conversion of 1,2-propandiol using FSM-16 was also examined in the presence and absence of hydrogen. Furthermore, hydration reactions of 1- and 2-propanol when using FMS-16 were examined. Based on the results obtained from this investigation, it was concluded that the conversion using a more acidic FSM-16 molded by wet treatment proceeded through dehydration rather than through hydro cracking.
    SOC CHEMICAL ENG JAPAN, Mar. 2015, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 48(3) (3), 215 - 221, English
    [Refereed]
    Scientific journal

  • Shigeru Sugiyama, Haruka Kinoshita, Ippei Shinomiya, Ryuta Kitora, Keizo Nakagawa, Masahiro Katoh, Kohei Masumoto
    During the recovery of phosphorus from the powder collected in a bag filter during the recycling of used fluorescence tubes (bag-powder), the batch method with aqueous HNO3 was used to examine the elution behavior of aqueous phosphate contained in the bag-powder. The main components of the bag-powder included Ca2+, PO43- and Y3+ along with Si4+, Sr2+ and lanthanide cations such as La3+ and Ce4+. Therefore, it seemed possible that, with the selective dissolution of Ca2+ and PO43- from the bag-powder, these lanthanide cations in the residue could be enriched. With the batch method, most of the phosphate in the bag-powder was dissolved within 0.2 min using 1.0 mol/L HNO3. The dissolution behavior of calcium cation was similar to that of the phosphate. In contrast, the dissolution of yttrium, the content of which was the highest among the lanthanide cations in the bag-powder, was increased with the dissolution times, reaching complete dissolution after 24 h. The Sr2+, La3+ and Si4+ in the bag-powder, however, did not dissolve under the same conditions. Although Ca2+, PO43- and Y3+ were the main components in the nitric acid extract, Y3+ was separated as YPO4 at pH = 4.0, while Ca2+ and PO43- were separated as calcium phosphates at pH = 7.0. These results revealed that the separation of calcium phosphates, YPO4 and some residue was possible, and resulted in the enrichment of lanthanide cations along with the recovery of phosphorus from the bag-powder. Using the present technique, 91% of the P in the bag-powder was recovered.
    SOC CHEMICAL ENG JAPAN, Feb. 2015, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 48(2) (2), 99 - 103, English
    [Refereed]
    Scientific journal

  • Shigeru Sugiyama, Takuya Ehiro, Yoshihisa Nitta, Ai Itagaki, Keizo Nakagawa, Masahiro Katoh, Yuuki Katoh, Shuji Akihara, Toshiya Yasukawa, Wataru Ninomiya
    Although previous researchers have found that FSM-16 (#16 Folded Sheet Mesoporous material) doped with chromium and related Cr-doped silica catalysts has shown great activity for the oxidative dehydrogenation of isobutane to isobutene, information on the nature of these catalysts is insufficient. For this study, three types of Cr-doped silica catalysts were prepared by applying the template ion exchange method. CrOx/FSM-16 and CrOx/SiO2 were used as references. These catalysts were used for oxidative dehydrogenation, which was then characterized via various techniques. The most active catalyst was Cr-doped silica, which did not have the hexagonal structure that is characteristic of mesoporous FSM-16. Various characterizations showed that the catalytic activity of the Cr-species, stemmed from a weak acidic nature and a redox nature that originated from the combination of silicate and a Cr cation, as opposed to the hexagonal structure and strong acidic nature of FSM-16.
    SOC CHEMICAL ENG JAPAN, Feb. 2015, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 48(2) (2), 133 - 140, English
    [Refereed]
    Scientific journal

  • Tiantian Jia, Molly M. J. Li, Lin Ye, Sam Wiseman, Guoliang Liu, Jin Qu, Keizo Nakagawa, S. C. Edman Tsang
    Single layer MoS2 synthesized by exfoliation with Li is demonstrated to take up the dye molecule, Eosin Y, with strong binding affinity via sulfur vacancies. This dye-sensitized single layer MoS2 ensemble exhibits remarkable activity and stability for photocatalytic hydrogen production from water.
    ROYAL SOC CHEMISTRY, 2015, CHEMICAL COMMUNICATIONS, 51(70) (70), 13496 - 13499, English
    [Refereed]
    Scientific journal

  • Yasuko Kajiwara, Hideo Iwai, Keizo Nakagawa, Noriko Kodani, Satoka Aoyagi
    Inorganic and organic composite materials have been utilized as high-functional materials over a wide variety of industrial fields. Understanding interactions between inorganic and organic components is important for their further improvements. In this study, hydroxyapatite (HAp) nanoparticles synthesized with sodium dodecylphosphate (SDP) were evaluated using gentle-SIMS (G-SIMS) and g-ogram, which are spectrum analysis methods for time-of-flight SIMS. As a result, G-SIMS and g-ogram indicates that SDP molecules are adsorbed onto the surface of HAp nanoparticles and partly used to form HAp nanostructures. The more intact fragment ions indicated by G-SIMS and g-ogram imply that lamellar structures are formed in HAp sample synthesized with the high SDP concentration. Therefore, it is suggested that G-SIMS and g-ogram provide useful information for understanding chemistry of fine structures within inorganic and organic composite materials. Copyright (c) 2014 John Wiley & Sons, Ltd.
    WILEY-BLACKWELL, Nov. 2014, SURFACE AND INTERFACE ANALYSIS, 46, 209 - 212, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Toshimasa Ogata, Kazuki Yamaguchi, Jun Jitoku, Ken-Ichiro Sotowa, Shigeru Sugiyama, Toshihiro Moriga, Motonari Adachi
    Layered titanate nanosheets with or without a lamellar mesostructure were synthesized by a hydrothermal process using a surfactant-templating approach. The mesostructure of the layered titanate nanosheets can be controlled by changing pH. Surfactant 1,12-dodecanediamine molecules play different roles in the formation of layered titanate nanosheets depending on the presence of ammonium cations. Positively charged 1,12-dodecanediamine molecules act as both a lamellar template and cations during the formation of the layered titanate nanosheets, which results in the formation of an ordered lamellar mesostructure at pH ranging from 10.0 to 11.0. The obtained layered titanate nanosheets with a lamellar mesostructure showed a larger wavelength shift of the absorption edge in the visible region and higher adsorption toward Rhodamine B compared with that of layered titanate nanosheets without a lamellar mesostructure, which led to improved photocatalytic degradation of Rhodamine B under visible light irradiation. The presence of a lamellar mesostructure in the layered metal oxide nanosheets is an important factor for the surface functionalization of nanosheets.
    AMER SCIENTIFIC PUBLISHERS, Jul. 2014, SCIENCE OF ADVANCED MATERIALS, 6(7) (7), 1535 - 1541, English
    [Refereed]
    Scientific journal

  • Shigeru Sugiyama, Ippei Shinomiya, Ryuta Kitora, Keizo Nakagawa, Masahiro Katoh
    A method for the recovery and enrichment of the phosphate from dephosphorization slag was examined. First, the elution of aqueous phosphate from dephosphorization slag using aqueous HNO3 was examined using both the batch and flow methods. With the batch method, 82% of the dephosphorization slag could be dissolved within 30 min using 1.0 mol/L HNO3, indicating that the batch method could be used for mass processing to extract phosphorus in the bulk phase, but all components contained in the slag were unselectively dissolved. In contrast, by using 0.05 mol/L HNO3 via the flow method, 22% of the slag was dissolved in 100 min giving a more selective dissolution of phosphate from the slag compared with the batch method, which indicated that this method would be incompatible with mass processing for the purpose of extracting phosphorus in the bulk phase. In order to remove the Fe-species in the aqueous solution obtained by the batch method using 1.0 mol/L HNO3, which has been referred to as the "slag solution," it was necessary to add calcium hydroxyapatite (CaHAp) to the slag solution. The optimal conditions for the removal of Fe-species using CaHAp were observed at a solution pH of ca. 1.5, which resulted in 100% removal of the Fe-species after 4 h. When the pH of the slag solution was adjusted to 7.0 after removing the Fe species, a pale pink solid sample was precipitated. The amounts of phosphate in the slag solution and in the pink solid were 3.5 and 42.0 mol%, respectively, indicating that the treatment suggested in the present study could be used for the recovery and enrichment of phosphate, that is, phosphorous, from dephosphorization slag.
    SOC CHEMICAL ENG JAPAN, Jun. 2014, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 47(6) (6), 483 - 487, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Tiantian Jia, Weiran Zheng, Simon Michael Fairclough, Masahiro Katoh, Shigeru Sugiyama, Shik Chi Edman Tsang
    We report single molecular sheets of niobate prepared by a simple bottom-up approach using hydrothermal synthesis of niobium ethoxide with the aid of triethanolamine as a structural modifier: the high kinetic stability of these molecular entities against self-assembly allows them to mix well with other colloids and facilitates their extensive electronic interactions and thus photocatalytic hydrogen evolution activity from water is much enhanced over composite of single niobate sheets with graphene and MoS2 due to efficient electron transfer and charge separation.
    ROYAL SOC CHEMISTRY, 2014, CHEMICAL COMMUNICATIONS, 50(89) (89), 13702 - 13705, English
    [Refereed]
    Scientific journal

  • Kouji Kinouchi, Masahiro Katoh, Keizo Nakagawa, Shigeru Sugiyama, Takushi Yoshikawa, Mamoru Wada
    The steam reforming of bio-ethanol has been carried out to compare with reagent ethanol using a palladium membrane at several reaction conditions (673 or 873 K, Delta P = 0.10 MPa and steam-to-carbon ratio (S/C) = 4-10). The raw material of these experiments was surplus bio-ethanol, which is one of the by-products in fermentation with sulfuring process in cornstarch production. As a result, the amount of total H-2 formation for bio-ethanol was comparable to that obtained with reagent ethanol under the same conditions. However, for bio-ethanol, the values of hydrogen permeate flow and hydrogen purity were smaller than that of reagent ethanol. In contrast, the amount of CO formed from bio-ethanol was greater than that from reagent ethanol. It is considered that carbon, which has a negative influence on the hydrogen-permeability of the palladium membrane, was produced from CO. The amount of CO was significantly decreased by lowering the temperature from 873 to 673 K. Moreover, CO was also decreased by increasing S/C and was not detected over S/C of 8. However, the amount of total hydrogen production and hydrogen permeate flow decreased by increasing the S/C ratio. Therefore, the best condition for hydrogen production from bio-ethanol using the palladium membrane reactor was at 673 K and S/C = 8.
    SOC CHEMICAL ENG JAPAN, 2014, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 47(1) (1), 14 - 20, English
    [Refereed]
    Scientific journal

  • Shigeru Sugiyama, Haruki Tanaka, Takuya Bando, Keizo Nakagawa, Ken-Ichiro Sotowa, Yuuki Katou, Takanori Mori, Toshiya Yasukawa, Wataru Ninomiya
    The liquid-phase oxidation of propylene glycol using Pd/C undoped with any heavy metal such as tellurium in the presence of aqueous NaOH under pressurized oxygen resulted in a significant production of lactic acid and a minimal amount of hydroxyl acetone, although, under these conditions, sodium lactate as sodium analogue of lactic acid has been known to easily convert to sodium pyruvate. The advantageous effect of doping Pd/C with a heavy metal, which has been reported for various catalytic reactions in an aqueous phase, was not observed in the present oxidation. Previous papers have reported that oxidation using heavy-metal-free Pd/C and Pd/C doped with a heavy metal at atmospheric pressure and a pH 8 produced pyruvic acid via the formation of hydroxyl acetone and lactic acid, respectively, and that Pd/C doped with a heavy metal rather than Pd/C was suitable for the formation of pyruvic acid from propylene glycol. However the results of the present study show that the use of pressurized oxygen conditions as used in the present study can result in the exclusion of doping with a heavy metal in the preparation of the catalyst, which is amenable to green chemistry. (C) 2012 Elsevier B. V. All rights reserved.
    ELSEVIER SCIENCE BV, Mar. 2013, CATALYSIS TODAY, 203, 116 - 121, English
    [Refereed]
    Scientific journal

  • Shigeru Sugiyama, Takuya Bando, Yusuke Seno, Emiko Watanabe, Keizo Nakagawa, Masahiro Katoh, Ken-Ichiro Sotowa, Yuuki Katou, Shuji Akihara, Wataru Ninomiya
    The optimization of the oxidative esterification of propionaldehyde to methyl propionate using a supported palladium catalyst in methanol under heavy-metal-free and pressurized-oxygen conditions, which we recently reported in a previous paper, were carried out together with a study of the reaction route, the nature of the catalytic active sites, and the effect of the support. In our previous paper, we reported significantly improved activity for oxidative esterification using commercially available 5% Pd/Al2O3 at 1.5 MPa of O-2 gas and 333 K and emphasized that the doping of 5% Pd/Al2O3 with lead was not needed for the reaction system, but we could not improve the activity that was reported when using 5% Pd/gamma-Al2O3 doped with 5% Pb (a 93.2% conversion of propionaldehyde, 76.8% selectivity for methyl propionate and a 71.6% yield of methyl propionate) at 0.3 MPa of O-2 gas and 353 K, as reported by another laboratory. In the present study, however, we exceeded those values and obtained a 98.3% conversion of propionaldehyde, 75.3% selectivity for methyl propionate and a 74.0% yield of methyl propionate using 5% Pd/gamma-Al2O3 undoped with Pb at 1.5 MPa of O-2 gas and 333 K. It should be noted that, in the preparation of the present 5% Pd/gamma-Al2O3, Pd was doped onto Al2O3 that had been previously treated with aqueous NaOH. Another active alumina support, eta-Al2O3, prepared from boehmite, afforded activity that was substantially lower than that of gamma-Al2O3 and depended on the calcination temperature of boehmite to eta-Al2O3. When using various concentrations of CH3OH in the aqueous reaction solution, the oxidative esterification proceeded through the formation of propionic acid. To determine why the Al2O3 support afforded better activity than the active carbon support, Pd/Al2O3 and Pd/C catalysts were examined by XAFS (X-ray absorption fine structure). XAFS revealed that Pd on Al2O3 shows a better redox nature than Pd on C, which resulted in activity on Pd/Al2O3 that was better than that on Pd/C.
    SOC CHEMICAL ENG JAPAN, 2013, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 46(7) (7), 455 - 460, English
    [Refereed]
    Scientific journal

  • Shigeru Sugiyama, Yasuhiro Okada, Youhei Kosaka, Keizo Nakagawa, Masahiro Katoh, Yuuki Katou, Shuji Akihara, Toshiya Yasukawa, Wataru Ninomiya
    The catalytic conversion of 1,2-propandiol to propanal is examined using FSM-16 particles (0.85-1.70 mm) molded by wet-treatment and pressurization. When FSM-16 was molded with 0.6 g of pressurization and supplied to the catalytic conversion of 1,2-propandiol at 673 K, this system resulted in a 94.8% conversion of 1,2-propandiol and 90.5% selectivity to propanal at 0.25 h on-stream, which was the maximum amount of activity. However, at 4.50 h on-stream, the activity decreased extremely to deactivation 19.9% conversion of 1,2-propandiol and 84.7% selectivity to propanal. In contrast, when FSM-16 molded with wet-treatment (0.15 g) was used for the conversion at 573 K, activity was greatly increased and stable 98.6% conversion of 1,2-propandiol and 56.2% selectivity to propanal at 0.25 h on-stream followed by 91.9% and 52.5%, respectively, at 4.50 h on-stream. The hexagonal structure of FSM-16 was suggested to have contributed to the suitable conversion of 1,2-propandiol to propanal.
    SOC CHEMICAL ENG JAPAN, 2013, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 46(9) (9), 620 - 624, English
    [Refereed]
    Scientific journal

  • Ichiro Mihara, Keizo Nakagawa, Masahiro Kudo, Satoka Aoyagi
    Nanostructure evaluation is crucial for developing highly controlled nanomaterials. The titanate nanosheets with a lamellar mesostructure synthesized using a lamellar self-assembly of dodecanediamine (DDA) were evaluated with time-of-flight secondary ion mass spectrometry (TOF-SIMS) and gentle-SIMS (G-SIMS) to evaluate detailed chemical structures which have not been provided with transmission electron microscopy (TEM), X-ray diffraction, and ultraviolet-visible diffuse reflectance spectra analysis. Although TOF-SIMS is a useful method for evaluating complex organic and inorganic materials, it is often difficult to interpret TOF-SIMS spectra of complex samples due to complicated fragment ions. Therefore, G-SIMS, helpful for analyzing intricate TOF-SIMS spectra, was applied to extract important information of TOF-SIMS data. For example, molecular ions and more intact fragment ions are emphasized and found easily using G-SIMS. The layered titanate nanosheets sample produced using tetraisopropyl orthotitanate (TIPT), triethanolamine (TEOA), and DDA (TIPT + DDA + TEOA) and reference nanoparticle samples TIPT + DDA, TIPT + TEOA, and TIPT were prepared. As a result, titanate compounds and DDA molecular ions were only detected in TIPT + DDA + TEOA. Therefore, it is indicated that robust lamellar mesostructure of titanate compounds and DDA is produced by reactions related to TIPT, DDA, and TEOA. It is also suggested that organic metal materials which have large hydrocarbon groups can be analyzed using G-SIMS. Copyright (C) 2012 John Wiley & Sons, Ltd.
    WILEY-BLACKWELL, Jan. 2013, SURFACE AND INTERFACE ANALYSIS, 45(1) (1), 453 - 456, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Tomoya Hoshinoo, Ken-Ichiro Sotowa, Shigeru Sugiyama, Laylla Rkiouak, Vincent Dubois, Sophie Hermans
    Carbon black (CB)-supported Pd catalysts (Pd/CB) were covered with organosilica layers via the hydrolysis of phenyl-triethoxysilane (PhTES). Coverage of Pd nanoparticles with organosilica layers suppressed particle sintering of Pd, as compared to the case of uncovered Pd/CB. The organosilica layers had hydrophobic properties because of the presence of phenyl groups. As a result, the organosilica-coated Pd catalysts prepared using PhTES showed superior catalytic performance for cyclohexane dehydrogenation, even after reduction at 623 K under H-2 atmosphere.
    CHEMICAL SOC JAPAN, Oct. 2012, CHEMISTRY LETTERS, 41(10) (10), 1308 - 1310, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Kazuki Yamaguchi, Keiji Yamada, Ken-Ichiro Sotowa, Shigeru Sugiyama, Motonari Adachi
    The synthesis of metal oxide nanosheets using a lamellar phase as a template effectively modified the nanosheets because surfactant molecules surround the entire surface of the nanosheets. Here, we show the development of layered titanate nanosheets with a lamellar mesostructure. The layered titanate nanosheet forms by using the lamellar self-assembly of cationic dodecanediamine as a template and an electrostatic interaction between negatively charged titanate nanosheets and positively charged 1,12-dodecanediamine during hydrothermal synthesis. This approach leads to titanate nanosheets with new properties such as visible light absorption and a high adsorption of cationic organic compounds, which results in the effective photodegradation of Rhodamine B under visible-light irradiation. This approach has important implications for the use of metal oxide nanosheets in environmental and industrial applications.
    WILEY-V C H VERLAG GMBH, Jun. 2012, EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, (16) (16), 2741 - 2748, English
    [Refereed]
    Scientific journal

  • S. Sugiyama, T. Hayashi, I. Shinomiya, K. Nakagawa, K.-I. Sotowa
    May 2012, Phosphorus Research Bulletin, 27, 23 - 27, English
    [Refereed]

  • Keizo Nakagawa, Tetsuya Okayama, Yusuke Tanimoto, Ken-Ichiro Sotowa, Shigeru Sugiyama, Toshihiro Moriga, Sakae Takenaka, Masahiro Kishida
    Carbon black-supported Pt metal particles (Pt/CB) were covered with microporous silica layers using different organosilanes like methyltriethoxysilane (MTES)(SiO2(MTES)/Pt/CB) and phenyltriethoxysilane (PhTES) (SiO2(PhTES)/Pt/CB). Pt metal particles in Pt/CB covered with microporous silica layers were stable at high temperature up to 973 K in a hydrogen atmosphere, because the microporous silica layers that wrapped around the Pt metal particles essentially prevent particle sintering. Methyl or phenyl groups were introduced into the silica layers that covered the Pt metal particles using MTES or PhTES hydrolysis. Micropores were formed in the silica layers effectively after thermal treatment at 973 K. The microporous silica-coated Pt catalysts were used as model catalysts for the dehydrogenation of cyclohexane. The microporous silica-coated Pt catalysts with thermal treatment at 973 K exhibited a higher conversion of cyclohexane compared with Pt/CB. Especially, the SiO2(PhTES)/Pt/CB catalysts showed relatively higher conversion of cyclohexane compared with the other silica-coated Pt catalysts even when the SiO2 loading was high. Microporous silica layers with a larger micropore volume promoted the diffusion of cyclohexane during the catalytic reaction. (C) 2011 Elsevier B.V. All rights reserved.
    ELSEVIER SCIENCE BV, Mar. 2012, APPLIED CATALYSIS A-GENERAL, 419, 13 - 21, English
    [Refereed]
    Scientific journal

  • Kenji Arita, Aimi Yamamoto, Yukari Shinonaga, Keiko Harada, Yoko Abe, Keizo Nakagawa, Shigeru Sugiyama
    The aims of this study were to improve the mechanical and chemical properties of conventional restorative glass ionomer cement (GIC) by adding hydroxyapatite (HAp) preparations with different characteristics, and to investigate the underlying reaction mechanisms. Fuji IX GP (R) was used as the control GIC. The experimental GICs consisted of four HAp-particles with different characteristics added at 8 mass% to Fuji IX-powder. All cements were prepared by mixing with Fuji IX-liquid (P/L=3.6). Four HAp-particles were analyzed, and then the mechanical strengths and the fluoride-ion- release-recharge-behaviors of five GIC groups were evaluated. The results of this study demonstrate that the addition of HAp particles with highly reactive properties such as high specific surface area can enhance the flexural strength and fluoride ion release properties of conventional restorative GIC. Our results further indicate that HAp functions as an adsorbent and an ion exchangeable agent, resulting in improved mechanical and chemical properties of GIC.
    JAPANESE SOC DENTAL MATERIALS DEVICES, Sep. 2011, DENTAL MATERIALS JOURNAL, 30(5) (5), 672 - 683, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Kazuki Yamaguchi, Keiji Yamada, Toshimasa Ogata, Ken-Ichiro Sotowa, Shigeru Sugiyama, Motonari Adachi
    Titanate nanosheets with a lamellar mesostructure were developed using the lamellar self-assembly of cationic 1,12-dodecanediamine (DDA) as a template. An electrostatic interaction between negatively charged titanate nanosheets and positively charged DDA molecules was required to form layered titanate nanosheets. This approach leads to titanate nanosheet surface characteristics such as visible light absorption and high adsorption of hydrophobic organic compounds.
    CHEMICAL SOC JAPAN, Jul. 2011, CHEMISTRY LETTERS, 40(7) (7), 687 - 689, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Yosuke Umezaki, Kaori Kitamura, Ken-Ichiro Sotowa, Shigeru Sugiyama
    We synthesized hydroxyapatite (HAp) nanoparticles using a lamellar phase, which was formed using a phosphorous surfactant, sodium dodecylphosphate (SDP). The HAp nanoparticles synthesized using SDP, after calcination, adsorbed more egg white lysozyme compared to that synthesized without SDP.
    CHEMICAL SOC JAPAN, Apr. 2011, CHEMISTRY LETTERS, 40(4) (4), 387 - 389, English
    [Refereed]
    Scientific journal

  • Ken-Ichiro Sotowa, Atsushi Yamamoto, Keizo Nakagawa, Shigeru Sugiyama
    This study was conducted to clarify the effect of indentations and baffles formed in a deep microchannel on the mixing performance. Since the fluid flow in a deep microchannel is laminar, the mixing relies on the molecular diffusion, which typically takes several hundreds of seconds even in microscale-channels. Formation of indentations and baffles is expected to be a convenient approach to enhance mixing rate in deep microchannels. Results from both theoretical and experimental investigations demonstrated they induce the secondary flow in the downstream of the intersection and thus enhance mixing. The mixing performance was influenced by their dimensions and the flow rate. The study showed that the flow rate was one of the most important parameters which affect the mixing rate. (C) 2010 Elsevier B.V. All rights reserved.
    ELSEVIER SCIENCE SA, Mar. 2011, CHEMICAL ENGINEERING JOURNAL, 167(2-3) (2-3), 490 - 495, English
    [Refereed]
    Scientific journal

  • Shigeru Sugiyama, Tomoki Hayashi, Dai Ioka, Keizo Nakagawa, Ken-Ichiro Sotowa
    Aqueous ammonium is a threat to the vitality of various fish and the present study examined the feasibility of its removal from both seawater and freshwater using magnesium hydrogen phosphate (MgHPO4). Regardless of the type of water, aqueous ammonium was favorably removed particularly under basic conditions such as a pH = 10. Even under neutral conditions (pH = 7), some aqueous ammonium can be removed. The results of the present study showed that MgHPO4 can be used to remove a serious threat to the vitality of fish posed by the dilute concentration of aqueous ammonium in both seawater and freshwater. The resultant formation of magnesium ammonium phosphate (MAP) was detected by X-ray diffraction (XRD), which confirmed the removal of aqueous ammonium. It is common knowledge that MAP is a fertilizer for waterweeds, which are essential for the growth of the fish while simultaneously promoting their nourishment.
    Japanese Association of Inorganic Phosphorus Chemistry, 2011, Phosphorus Research Bulletin, 25, 23 - 27, English
    [Refereed]

  • Shigeru Sugiyama, Dai Ioka, Tomoki Hayashi, Makiko Noguchi, Keizo Nakagawa, Ken-Ichiro Sotowa, Kyoko Takashima
    The recovery of aqueous phosphate from a model solution consisting of NH4+, NO2- and NO3-, which are contained in a surplus that phosphate in rivers in Tokushima Prefecture, Japan, using boehmite together with the elution behaviors of phosphate from dephosphorization slag using various eluates were examined. The recovery of aqueous phosphate using boehmite was not influenced by the coexistence of those nitrogen-containing contaminants under various pH conditions. For the elution behaviors of phosphate from dephosphorization slag, it was found that aqueous HNO3 among various acidic and basic solutions was a suitable solution as an eluate. Present study suggests that the employment of the unused resources such as aqueous phosphate in rivers and phosphate in the dephosphorization slag can be used as a possible candidate as a new raw material for rare phosphate.
    Japanese Association of Inorganic Phosphorus Chemistry, 2011, Phosphorus Research Bulletin, 25, 18 - 22, English
    [Refereed]

  • Shigeru Sugiyama, Yuhki Kato, Takahiro Wada, Shirou Ogawa, Keizo Nakagawa, Ken-Ichiro Sotowa
    MCM-41 and FSM-16 were both prepared using no hydrothermal conditions, and nickel was doped into these catalysts (Ni-MCM-41 and Ni-FSM-16) using a template ion exchange method. FSM-16 and Ni-FSM-16 had greater catalytic activity for the conversion of ethanol than MCM-41 and Ni-MCM-41, indicating that FSM-16 has potential as a catalyst for the conversion of ethanol to propylene.
    SPRINGER/PLENUM PUBLISHERS, Jun. 2010, TOPICS IN CATALYSIS, 53(7-10) (7-10), 550 - 554, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Toshimasa Ogata, Ken-Ichiro Sotowa, Shigeru Sugiyama, Motonari Adachi
    Layered titanate nanosheets were synthesized by hydrolyzing titanium tetraisopropoxide (TIPT) in hydrothermal solution using triethanolamine (TEOA), and dodecanediamine (DDA) as surfactant. The effects of synthesis conditions on the formation of layered titanate nanosheets were investigated. A layered structure of the titanate was produced under basic (pH12.8) conditions using NaOH or NH(4)OH aqueous solution. The flaky forms were observed only in reaction mixtures that included DDA, and the flaky forms had multilayer structure comprising several monolayer sheets. In addition, TEOA and DDA promote control of the crystalline structure of layered titanate. The surface acidity of layered titanate nanosheets was studied by coloration with color indicator reagents. The acidity of the sample corresponds to that of dilute hydrochloric acid. It is assumed that acid sites can be formed on the surface of titanate nanosheets by elimination of NH(4)(+) caused by calcination in air.
    WORLD SCIENTIFIC PUBL CO PTE LTD, Jun. 2010, INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 24(15-16) (15-16), 3248 - 3252, English
    [Refereed]
    Scientific journal

  • Yuhki Kato, Yukinori Nishioka, Takahiro Wada, Keizo Nakagawa, Ken-Ichiro Sotowa, Shigeru Sugiyama
    The conversion of ethylene to propylene on MCM-41 and that doped with Ni, the latter of which was prepared using various procedures, is described. Undoped MCM-41 showed no activity for the conversion of ethylene to propylene. The catalytic activity for the conversion of ethylene to propylene on Ni-doped MCM-41 was strongly dependent on the preparation procedure of the catalyst and the reaction conditions. It was found that template ion-exchange procedure using organic base was suitable for the preparation of Ni-doped MCM-41, while the catalysts thus prepared was suffered from carbon deposition during the conversion of ethylene. However the introduction of water into the reactant gas and the slower introduction of the reactant gas into the catalysts resulted in the enhancement of the catalytic activity and stability.
    WORLD SCIENTIFIC PUBL CO PTE LTD, Jun. 2010, INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 24(15-16) (15-16), 3253 - 3256, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Yusuke Tanimoto, Tetsuya Okayama, Ken-Ichiro Sotowa, Shigeru Sugiyama, Sakae Takenaka, Masahiro Kishida
    Carbon black (CB)-supported Pt metal nano-particles were covered with microporous silica layers using successive hydrolysis of 3-aminopropyl-triethoxysilane (APTES) and methyltriethoxysilane (MTES). The Pt/CB nanoparticles covered with microporous silica layers showed the high sintering resistance of Pt metal particles to thermal treatment at 973 K in a H-2 atmosphere as compared with Pt/CB. As a result, this catalyst showed higher catalytic activity for cyclohexane decomposition than Pt/CB after thermal treatment.
    SPRINGER, May 2010, CATALYSIS LETTERS, 136(1-2) (1-2), 71 - 76, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Sakae Takenaka, Hideki Matsune, Masahiro Kishida
    Silica-coated Pt-Ni alloys were prepared using a water-in-oil-type microemulsion. The silica-coated Pt-Ni alloys prepared without thermal treatment decomposed ethylene to form nanocomposites of carbon nanofibers.
    ELSEVIER SCIENCE BV, 2010, SCIENTIFIC BASES FOR THE PREPARATION OF HETEROGENEOUS CATALYSTS: PROCEEDINGS OF THE 10TH INTERNATIONAL SYMPOSIUM, 175, 793 - 796, English
    [Refereed]
    International conference proceedings

  • Keizo Nakagawa, Yusuke Tanimoto, Tetsuya Okayama, Ken-Ichiro Sotowa, Shigeru Sugiyama, Toshihiro Moriga
    Carbon-supported Pt metal nanoparticles were covered with a silica layer including phenyl or methyl groups using successive hydrolysis of 3-aminopropyl-triethoxysilane (APTES) and phenyltriethoxysilane (PhTES) or methyltriethoxysilane (MTES), followed by reduction with H-2. Highly dispersed Pt nanoparticles could be produced in silica-coated Pt catalysts using each organosilane. The results of N-2 adsorption showed that micropores were formed in the silica layer by introducing functional groups into the silica network. Because the microporous structure of silica layers which wrapped Pt metal particles increased the diffusion capability of cyclohexane, the Pt catalyst covered with silica layers containing functional groups showed higher activity in the cyclohexane dehydrogenation, compared with Pt catalysts covered with a silica layer containing no functional groups.
    ELSEVIER SCIENCE BV, 2010, SCIENTIFIC BASES FOR THE PREPARATION OF HETEROGENEOUS CATALYSTS: PROCEEDINGS OF THE 10TH INTERNATIONAL SYMPOSIUM, 175, 201 - 208, English
    [Refereed]
    International conference proceedings

  • Shigeru Sugiyama, Haruki Tanaka, Tetsuo Kikumoto, Keizo Nakagawa, Ken-Ichiro Sotowa, Keiko Maehara, Wataru Ninomiya
    According to previous reports, the oxidative dehydrogenation of lactic acid to pyruvic acid in an aqueous phase does not proceed with Pd/C, while Pd/C doped with Te or Pb has catalytic activity at atmospheric pressure and 363 K in an aqueous NaOH solution at a pH of 8. Since use of heavy metals, such as Te or Pb, is inconsistent with green chemistry, a heavy-metal-free Pd/C catalyst is employed in the present study. The oxidative dehydrogenation of sodium lactate to sodium pyruvate in an aqueous phase at 358 K under pressurized oxygen at 1MPa proceeded favorably using Pd/C with no adjustment of solution pH. Under pressurized oxygen, the catalytic activity of Pd/C was similar to that of Pd/C doped with either Te or Pb. This result suggests that a heavy-metal-free Pd/C catalytst might also be applied to other catalytic reactions. As an alternative to doping Pd/C with Te or Pb, the dissolution of gaseous oxygen into the reaction solution significantly enhanced the catalytic activity of Pd/C. To show the contribution of the dissolution of gaseous oxygen, the effects of the volume of oxygen in the reactor (stainless autoclave) on the reaction rate and the activity were examined. The activation parameters thus obtained reveal that the volume of oxygen in the reactor is a more important determinant of catalytic activity than the activation of the reaction itself.
    SOC CHEMICAL ENG JAPAN, 2010, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 43(6) (6), 514 - 520, English
    [Refereed]
    Scientific journal

  • Application of a Microreactor in the Oxidative Dehydrogenation of Propane to Propylene on Calcium Hydroxyapatite and Magnesium ortho-Vanadate Doped and Undoped with Palladium
    Shigeru Sugiyama, Naoto Sugimoto, Adusa Ozaki, Yukimi Furukawa, Keizo Nakagawa, Ken-Ichiro Sotowa
    A microreactor was employed for the oxidative dehydrogenation of propane to propylene in order to suppress a deep oxidation of the resultant propylene to CO and CO(2). Magnesium ortho-vanadate, doped and undoped with palladium, and calcium hydroxyapatite, were used as catalysts while the reaction temperature was controlled by steady- and unsteady-state conditions. The enhancement of the selectivity to propylene was the most advantageous effect from using the microreactor, and it occurred when calcium hydroxyapatite was used under an unsteady-state. For example, the selectivity to propylene was 0 and 73.0% using a fixed-bed continuous- flow reactor and the microreactor, respectively, under almost identical propane conversion of 3.1 and 3.2%, respectively. The advantageous effect was also achieved, although to a lesser degree, when magnesium ortho-vanadate was used undoped with palladium under both steady- and unsteady-state conditions. However these advantageous effects of the microreactor were not observed with magnesium ortho-vanadate doped with palladium. With regard to the selectivity to propylene, the redox nature of the catalysts seemed to influence the performance of the microreactor.
    SOC CHEMICAL ENG JAPAN, 2010, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 43(7) (7), 575 - 580, English
    [Refereed]
    Scientific journal

  • Ken-Ichiro Sotowa, Shigeru Sugiyama, Keizo Nakagawa
    Microreactors have attracted the attention of many engineers in chemical industry. since they can lie used to improve yields of various chemical reactions. To use microreactors in in industrial process, it is necessary to increase the throughput. As a strategy to increase the productivity of nucroreactors, we are studying deep microchannel reactors, which are simple in structure, and thus can be introduced at a lower capital cost. One of the concerns in the application of deep microchannel reactors is the flow maldistribution, which reduces the contact area between two fluids and thus deteriorates the performance its a reactor. It is anticipated that the major cause of low maldistribution is the nonideality in the flow conditions, which can be magnified fit a microchannel with a high aspect ratio. In the present study. the impact of nonideality fit the channel geometry tin the reaction interface was studied for a microchannel with a depth of 400 mm, which is expected to be the typical dimension for industrial-scale productions. A series of computational fluid dynamics simulation was carried out for vanous flow rates and fluid properties.The iresults showed that, in a deep microchannel reactor, the effect of nonideality in the channel geometry oat the reaction interface as rather small. This result suggests that it uniform contracting of two reactant feeds can be realizable even in deep microchannel reactors.
    AMER CHEMICAL SOC, Sep. 2009, ORGANIC PROCESS RESEARCH & DEVELOPMENT, 13(5) (5), 1026 - 1031, English
    [Refereed]
    Scientific journal

  • Shigeru Sugiyama, Tetsuo Kikumoto, Haruki Tanaka, Keizo Nakagawa, Ken-Ichiro Sotowa, Keiko Maehara, Yoshiyuki Himeno, Wataru Ninomiya
    The oxidative dehydrogenation of sodium lactate to sodium pyruvate in an aqueous phase proceeded favorably using Pd/C and that doped with Te at 358 K with no adjustment in solution pH under pressurized oxygen, although previous reports had stated that this reaction would not proceed using Pd/C while Pd/C doped with either Pb, Bi or Te showed the activity at atmospheric pressure, 363 K, and a pH of 8.
    SPRINGER, Aug. 2009, CATALYSIS LETTERS, 131(1-2) (1-2), 129 - 134, English
    [Refereed]
    Scientific journal

  • Toshiyuki Iguchi, Sakae Takenaka, Keizo Nakagawa, Yoshiki Orita, Hideki Matsune, Masahiro Kishida
    Formation of carbon nanofibers (CNFs) and carbon nanotubes (CNTs) through the decomposition of ethylene at 973 K was achieved using various metal catalysts covered with silica layers. CNFs of various diameters were formed by ethylene decomposition over a Co metal catalyst supported on the outer surface of the silica. In contrast, silica-coated Co catalysts formed CNTs with uniform diameters by ethylene decomposition. Silica-coated Ni/SiO2 and Pt/carbon black also formed CNTs with uniform diameters, while CNFs and CNTs with various diameters were formed over Ni/SiO2 and Pt/carbon black without a silica coating. These results indicate that silica layers that envelop metal particles prevent sintering of the metal particles during ethylene decomposition. This results in the preferential formation of CNTs with a uniform diameter.
    SPRINGER/PLENUM PUBLISHERS, Jun. 2009, TOPICS IN CATALYSIS, 52(6-7) (6-7), 563 - 570, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Yusuke Tanimoto, Ken-Ichiro Sotowa, Shigeru Sugiyama, Sakae Takenaka, Masahiro Kishida
    Pt catalysts covered with an organosilica layer containing phenyl and/or methyl groups showed higher conversion in the dehydrogenation of cyclohexane, compared with Pt catalysts covered with a silica layer containing no functional groups. Micropores formed in the organosilica layer owing to the decomposition of functional groups by heat treatment resulted in this increase in catalytic activity which is dependent on the functional groups contained in the organosilica layer.
    CHEMICAL SOC JAPAN, May 2009, CHEMISTRY LETTERS, 38(5) (5), 480 - 481, English
    [Refereed]
    Scientific journal

  • Sugiyama Shigeru, Manabe Tomoyuki, Ioka Dai, Nakagawa Keizo, Sotowa Ken-Ichiro, Shigemoto Naoya
    鉄鋼業および発電施設から排出された廃液中のアンモニアを回収し,資源浄化を行うとともに,回収したアンモニアを再生して原料として使用するため,リン酸水素マグネシウムを回収剤とするプロセスの検討を,特に工業廃液からのアンモニアのい回収という点から検討を行った.実際の工業廃液を用いても十分に回収可能であることを明らかにした.
    May 2009, Phosphorus Research Bulletin, Vol.23, 15 - 19, English
    [Refereed]
    Scientific journal

  • Shigeru Sugiyama, Yuka Shimizu, Tomoyuki Manabe, Keizo Nakagawa, Ken-Ichiro Sotowa
    Aqueous Pb(2+), Cd(2+), Co(2+), and Cu(2+) were continuously removed and regenerated using a bulk powder of calcium hydroxyapatite (Ca(10)(PO(4))(6)(OH)(2), CaHAp) and a glass plate coated with a thin film of CaHAp. Although use of CaHAp effectively removed aqueous Pb(2+) from the wastewater, lead cations immobilized on CaHAp could not be regenerated in an aqueous solution due to the formation of lead hydroxyapatite (Pb(10)(PO(4))(6)(OH)(2)), which is insoluble in water at acidic and neutral pH. In contrast, Co(2+) and Cu(2+) immobilized on CaHAp were easily regenerated in an aqueous solution by treatment with an acidic aqueous solution containing Ca(NO(3))(2), as previously reported for the CaHAp-Cd(2+) system. We found that the combination of the removal of the aqueous divalent cations by the CaHAp film and subsequent regeneration of the immobilized divalent cations from the him allowed for recycling of the him and for removal and regeneration of aqueous Cd(2+), Co(2+), and Cu(2+). (c) 2009 Elsevier Inc. All rights reserved.
    ACADEMIC PRESS INC ELSEVIER SCIENCE, Apr. 2009, JOURNAL OF COLLOID AND INTERFACE SCIENCE, 332(2) (2), 439 - 443, English
    [Refereed]
    Scientific journal

  • S. Sugiyama, Y. Hirata, K. Nakagawa, K. -I. Sotowa, K. Maehara, Y. Himeno, W. Ninomiya
    The oxidative dehydrogenation of propane on Pd(2+)-incorporated magnesium ortho-vanadate (Pd-ortho-MgVO) was examined, despite the long-held belief that magnesium ortho-vanadate (Mg(3)V(2)O(8)) demonstrates scant catalytic activity in oxidative dehydrogenation. At 0.75 h on-stream, a higher activity than that on magnesium pyro-vanadate (monoclinic Mg(2)V(2)O(7)), which is believed to be one of the more active catalysts for oxidative dehydrogenation, was observed using 5% Pd-ortho-MgVO. Unfortunately, the higher catalytic activity decreased with time on stream due to the rapid abstraction of lattice oxygen from 5% Pd-ortho-MgVO. Although the abstracted lattice oxygen was not regenerated during oxidative dehydrogenation in the presence of excess gaseous oxygen, it was easily regenerated during reoxidation in the absence of propane in the feedstream. Redox cycles of palladium and vanadium species during the catalytic reaction and reoxidation were confirmed using extended X-ray absorption fine structure around the Pd K-edge and (51)V magic-angle spinning nuclear magnetic resonance, respectively. The results of the present study suggest that the higher catalytic activity observed using 5% Pd-ortho-MgVO at 0.75 h on-stream can be maintained by using an unsteady-state operation in combination with the catalytic reaction and catalyst reoxidation. (C) 2008 Elsevier Inc. All rights reserved.
    ACADEMIC PRESS INC ELSEVIER SCIENCE, Nov. 2008, JOURNAL OF CATALYSIS, 260(1) (1), 157 - 163, English
    [Refereed]
    Scientific journal

  • Shigeru Sugiyama, Yuichi Inaba, Tomoyuki Manabe, Keizo Nakagawa, Ken-Ichiro Sotowa
    Boehmite (Al(OH)O) was employed for the removal of aqueous phosphate in the presence of harmful anions such as carbonate, sulphate, nitrate, nitrite, chloride and fluoride at 298 K. Although boehmite was shown to remove a certain simultaneous removal of phosphate together with fluoride, no influence of the presence of carbonate, sulphate, nitrate, nitrite and chloride on the removal of phosphate by boehmite was observed. In the present study, two kinds of boehmite, a commercially available form and boehmite prepared using a sol-gel technique, were employed for the simultaneous removal of phosphate and fluoride, and it was found that the latter form was superior for such removal. Solid-state P-31 MAS NMR analyses revealed that, in the presence of fluoride, phosphate was removed onto boehmite as different types of phosphate species, depending on the solution pH and the source of boehmite. (c) 2008 The Ceramic Society of Japan. All rights reserved.
    CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI, Sep. 2008, JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 116(1357) (1357), 984 - 988, English
    [Refereed]
    Scientific journal

  • Sakae Takenaka, Takafumi Arike, Keizo Nakagawa, Hideki Matsune, Eishi Tanabe, Masahiro Kishida
    PERGAMON-ELSEVIER SCIENCE LTD, Feb. 2008, CARBON, 46(2) (2), 365 - 368, English
    [Refereed]
    Scientific journal

  • Sotowa K.-I, Kume K, Takagi K, Tomiya R, Sugiyama S, Nakagawa K
    2008, 10th International Conference on Microreaction Technology, IMRET 2008 - Topical Conference at the 2008 AIChE Spring National Meeting, 9
    [Refereed]

  • Shigeru Sugiyama, Naoto Sugimoto, Yuuki Hirata, Keizo Nakagawa, Ken-Ichiro Sotowa
    Japanese Association of Inorganic Phosphorus Chemistry, 2008, Phosphorus Research Bulletin, 22, 13
    [Refereed]

  • Shigeru Sugiyama, Takeshi Osaka, Yuuki Hirata, Yuki Kondo, Keizo Nakagawa, Ken-Ichiro Sotowa
    In order to improve the catalytic activity of magnesium ortho-vanadate (Mg3V2O8.) for the oxidative dehydrogenation of propane, Mg3V2O8, doped with Fe3+, (Fe-Mg3V2O8) was prepared. The improvement of the conversion of propane from 4.8% on Mg3V2O8 to 8.2% on 5% Fe-Mg3V2O8 together with the rather similar selectivity to propylene on un-doped and doped catalysts (62.3 and 61.0%, respectively). To evaluate the redox nature of Fe-Mg3V2O8 during the oxidative dehydrogenation, the catalysts used for the conversion of propane with and without gaseous oxygen were analyzed by XRD, solid state V-51 MAS NMR, XAFS, and XPS. After the propane conversion without oxygen, complete conversion of Fe-Mg3V2O8 to Mg2VO4 and MgO together with a small amount of Fe2O3 was observed by XRD, while the reduction of V5+ to V4+ was detected by V-51 MAS NMR and V K-edge XAFS from the catalyst. However XPS analysis showed that such a reduction was not observed over the surface of Fe-Mg3V2O8, since oxygen was supplied from bulk to the surface of the catalyst to keep V5+ over the surface. After the treatment of the reduced catalysts with gaseous oxygen, the complete regeneration of Fe-Mg3V2O8 from the reduced phase was confirmed by those analyses.
    SOC CHEMICAL ENG JAPAN, Dec. 2007, JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 40(12) (12), 1064 - 1071, English
    [Refereed]
    Scientific journal

  • Sakae Takenaka, Hiroshi Matsumori, Keizo Nakagawa, Hideki Matsune, Eishi Tanabe, Masahiro Kishida
    Carbon nanotube (CNT)-supported Pt metal nanoparticles were covered with silica layers by utilizing the successive hydrolysis of 3-aminopropyl-triethoxysilane and tetraethoxysilane on CNTs with Pt hydroxide. The CNT-supported Pt metal particles covered with silica layers (denoted as SiO2/Pt/CNT) were used as the electrocatalysts. SiO2/Pt/CNT electrocatalysts showed a high stability for the repeated potential cycling experiment, whereas Pt/CNT electrocatalysts were deactivated seriously for the experiment because of the growth of Pt metal particles in size. The silica layers in SiO2/Pt/CNT prevent the dissolution of Pt metal particles as well as the migration and agglomeration of Pt metal particles on the supports, which results in the improvement of the stability of Pt/CNT electrocatalysts.
    AMER CHEMICAL SOC, Oct. 2007, JOURNAL OF PHYSICAL CHEMISTRY C, 111(42) (42), 15133 - 15136, English
    [Refereed]

  • Keizo Nakagawa, Yusuke Murata, Masahiro Kishida, Motonari Adachi, Masahiko Hiro, Kenzo Susa
    Mono-dispersed cubic CeO2 nanoparticles have been synthesized using a surfactant-assisted method with laurylamine hydrochloride and cerium alkoxide modified with acetylacetone in an aqueous solution system. The prepared cubic CeO2 nanoparticles had a highly crystallized structure at 353 K and formed rod-like structures by calcination at 673 K after freeze-drying the CeO2 gel. We discovered a clear potential to make 1D, 2D or 3D CeO2-materials with a well-controlled characteristic length and shape by assembling cubic-shaped CeO2 nanoparticle building blocks. CeO2-TiO2 composite nanostructures have also been synthesized by changing the mole ratio of cerium alkoxide/titanium alkoxides. By utilizing the redox characteristic of CeO2, CeO2 nanoparticles and CeO2-TiO2 composite nanostructures after calcination, showed reaction activity toward the oxidization of I- to I-2, due to the Lewis acid sites available on the CeO2-TiO2 nanostructure. The activity of the CeO2-TiO2 composite nanostructure reached a maximum at CeBu/TIPT = 75/25, with a calcination temperature at 623 K. (c) 2007 Elsevier B.V. All rights reserved.
    ELSEVIER SCIENCE SA, Jul. 2007, MATERIALS CHEMISTRY AND PHYSICS, 104(1) (1), 30 - 39, English
    [Refereed]
    Scientific journal

  • Keizo Nakagawa, Sakae Takenaka, Satoshi Imagawa, Hideki Matsune, Masahiro Kishida
    Carbon nanofibers with uniform diameter of 10-15 nm were produced by the decomposition of ethylene over silica-supported Ni catalysts covered with silica layers.
    CHEMICAL SOC JAPAN, Feb. 2007, CHEMISTRY LETTERS, 36(2) (2), 252 - 253, English
    [Refereed]
    Scientific journal

  • Fumin Wang, Jinting Jiu, Lihua Pei, Keizo Nakagawa, Seiji Isoda, Motonari Adachi
    Nanoplate structure of TiO2 was synthesized by surfactant-assisted hydrothermal method. The existence of nitrate ion with a high concentration prohibited the rolling of the nanosheets and played the key role on the formation of nanoplates of titanate. After calcinations, the titanate was transformed into TiO2 nanoplates (anatase) of micrometer-size with 20-30 nm in thickness. (c) 2006 Elsevier B.V. All rights reserved.
    ELSEVIER SCIENCE BV, Jan. 2007, MATERIALS LETTERS, 61(2) (2), 488 - 490, English
    [Refereed]
    Scientific journal

  • Sotowa K.-I, Kuroda K, Ishihana K, Sugiyama S, Nakagawa K
    2007, 2007 AIChE Annual Meeting
    [Refereed]

  • Satoshi Imagawa, Koji Inoke, Kenji Kaneko, Hideki Matsune, Keizo Nakagawa, Sakae Takenaka, Masahiro Kishida
    Novel submicron scale composites with hollow hexagonal cylinder structures were prepared by hydrolysis of tetraethyl orthosilicate in a micelle solution composed of polyoxyethylene (n = 15) cetyl ether/cyclohexane/ water containing Co-N2H4 compound nanoparticles.
    CHEMICAL SOC JAPAN, Jul. 2006, CHEMISTRY LETTERS, 35(7) (7), 816 - 817, English
    [Refereed]
    Scientific journal

  • FM Wang, JT Jiu, LH Pei, K Nakagawa, S Isoda, M Adachi
    Highly crystallized anatase nanotubes and nanorods were prepared by rolling of molecular nanosheets, i.e., lepidocrocite, by surfactant-assisted hydrothermal method in low temperature (413 K). Alcohol played an important role for deintercalation of the surfactant between lepidocrocite nanosheets. Morphology of nanoscale anatase TiO2 materials was controlled by choosing pH and composition.
    CHEMICAL SOC JAPAN, Sep. 2005, CHEMISTRY LETTERS, 34(9) (9), 1238 - 1239, English
    [Refereed]
    Scientific journal

  • K Nakagawa, H Matsuyama, T Maki, M Teramoto, N Kubota
    Mesoporous silica membranes were prepared by solvent evaporation methods using tetraethyl orthosilicate (TEOS) as a silica source and hexadecyltrimethylammonium chloride (CTAC) as a template and applied to filtration membranes which enable to separate solutes by nano-order size. Effect of the membrane thickness on structure formation was studied. The final membrane thicknesses were controlled from 0.43 mu m to 127.7 mu m by several deposition methods, such as spin-coating, casting by applicator, and pouring in Petri dish. The mesophase of the membrane changed from a cubic phase to a one-dimensional hexagonal (1d-H) phase with increasing membrane thickness. The membrane thickness was one of the key factors to control the mesostructure formed in the solvent evaporation method. In the monitoring of the structural growth process, it was found that 1d-hexagonal structure was initially obtained on a glass substrate, and this structure was changed to cubic structure. This result can be explained by changing the surfactant concentration, which decides the mesostructures. For filtration application, the silica membrane with the cubic structure was deposited by spin-coating on the porous alumina substrate. The rejection coefficient of Vitamin B-12 with the molecular weight of 1355 was about 0.8. (C) 2005 Elsevier B.V. All rights reserved.
    ELSEVIER SCIENCE BV, Jul. 2005, SEPARATION AND PURIFICATION TECHNOLOGY, 44(2) (2), 145 - 151, English
    [Refereed]
    Scientific journal

  • K Nakagawa, FM Wang, Y Murata, M Adachi
    Network structure of single-crystal- like TiO2 nanowires with anatase phase was synthesized at low temperature by the "oriented attachment" mechanism. The most important factor for synthesis of network structure of the TiO2 nanowires was elucidated as the effect of acetylacetone (ACA) on the formation of nanowires. Morphology and crystalline structure of TiO2 were varied by changing the mole ratio of ACA to Ti.
    CHEMICAL SOC JAPAN, May 2005, CHEMISTRY LETTERS, 34(5) (5), 736 - 737, English
    [Refereed]
    Scientific journal

  • FM Wang, JT Jiu, LH Pei, K Nakagawa, S Isoda, M Adachi
    The highly crystallized lepidocrocite nanosheets of TiO2 was synthesized by hydrothermal methods at low temperature by using dodecanediamine (DDA) as a surfactant. The above structural features of the titanium oxide nanosheets were confirmed by transmission electron microscopy (TEM), selected area electron diffraction (SAED), X-ray diffraction (XRD) and UV-vis optical spectra analysis.
    CHEMICAL SOC JAPAN, Mar. 2005, CHEMISTRY LETTERS, 34(3) (3), 418 - 419, English
    [Refereed]
    Scientific journal

  • K Nakagawa, Y Murata, M Kishida, M Adachi
    Crystallized CeO2-TiO2 composite nanostructures were prepared by surfactant-assisted method using mixed solution of alkoxides at 353 K. The morphology and crystalline structure of CeO2-TiO2 composite were varied with changing the mole ratio of cerium n-butoxide/tetraisopropyl orthotitanate. These nariostructured materials after calcinations showed reaction activity to oxidize I- to I-2 owing to Lewis acid sites without irradiation of light.
    CHEMICAL SOC JAPAN, Mar. 2005, CHEMISTRY LETTERS, 34(3) (3), 296 - 297, English
    [Refereed]
    Scientific journal

  • M Adachi, K Nakagawa, K Sago, Y Murata, Y Nishikawa
    Highly crystallized GeO2 nanosheets were synthesized by hydrolysis and condensation reactions of germanium alkoxide using a 2-dimensional flat thin lamellar phase water layer containing surfactant molecules at the liquid-liquid interface as a confined reaction field.
    ROYAL SOC CHEMISTRY, 2005, CHEMICAL COMMUNICATIONS, (18) (18), 2381 - 2383, English
    [Refereed]
    Scientific journal

  • M Adachi, Y Murata, K Sago, K Nakagawa
    The formation processes of the integrated ordered mesostructure of silica at the liquid-liquid interface in laurylamine/tetraethoxysilane system were elucidated by measuring the small-angle X-ray scattering pattern every second during the formation processes using strong synchrotron radiation X-rays. Cylinders of silica were formed in random configurations in the very early stage of reactions at the liquid-liquid interface. Since these cylinders were restricted in a two-dimensional liquid-liquid interface, they aligned easily with each other and made an ordered structure composed of aligned cylinders at the interface. These ordered structures then accumulated with each other, making an integrated ordered structure, such as a hexagonal array.
    AMER CHEMICAL SOC, Jul. 2004, LANGMUIR, 20(14) (14), 5965 - 5968, English
    [Refereed]
    Scientific journal

  • H Matsuyama, K Nakagawa, T Maki, M Teramoto
    Phase separation rate during porous membrane formation by immersion precipitation was investigated by light scattering in a polyimide/N-Methylpyrrolidone (NMP)/water system. In the light scattering measurement, plots of scattered intensity against scattered angle showed maxima in all cases, which indicated that phase separation occurred by a spinodal decomposition (SD). Characteristic properties of the early stage of SD, such as an apparent diffusion coefficient D and an interphase periodic distance Lambda, were obtained. ie growth process of Lambda was also followed by light scattering. The growth rate had the same tendency as D-app when water content in the nonsolvent bath and the polymer concentration in the cast solution were changed. The pore size of the final membrane increased with decreasing water content, which was opposite to the tendency of A growth rate. (C) 2003 Wiley Periodicals, Inc.
    JOHN WILEY & SONS INC, Oct. 2003, JOURNAL OF APPLIED POLYMER SCIENCE, 90(1) (1), 292 - 296, English
    [Refereed]
    Scientific journal

■ MISC
  • 浸透圧補助逆浸透法による中空糸膜モジュールを利用した高濃縮プロセス
    中川敬三, 吉岡朋久, 松山秀人
    May 2024, 分離技術, 54(3) (3), 135 - 144, Japanese
    [Refereed][Invited]
    Introduction scientific journal

  • 光触媒機能を備えたナノシート積層型分離膜のファウリング耐性—Antifouling Property of Laminar Nanosheet Separation Membrane With Photocatalytic Function—特集 反応と分離の協奏
    中川 敬三
    Jan. 2023, 化学工学 = Chemical engineering of Japan, 87(1) (1), 7 - 10, Japanese

  • Organic Solvent Nanofiltration of Laminar Membranes Utilizing Two-dimensional Nanosheets
    中川敬三
    2022, 膜, 47(2) (2)

  • 化学工学年鑑2022 5.分離操作
    赤松憲樹, 大渡啓介, ALCANTARA AVILA J.Rafael, 中川敬三, 田中孝徳, 二井晋
    2022, 化学工学, 86(10) (10)

  • ラマン分光法を利用した中空糸RO/NF膜ナノポーラス構造のin situ解析
    中尾崇人, 中尾崇人, 明石真由美, 石橋美晴, 中川敬三, 中川敬三, 新谷卓司, 新谷卓司, 松山秀人, 松山秀人, 吉岡朋久, 吉岡朋久
    2021, 膜シンポジウム(CD-ROM), (33) (33)

  • Yoshioka Tomohisa, Akamatsu Kazuki, Nakagawa Keizo, Takaba Hiromitsu, Araki Sadao, Kamio Eiji, Matsuoka Atsushi, Kai Teruhiko, Kawakatsu Takahiro, Ohshiba Yuhei, Higa Mitsuru, Ishii Katsunori, Nomura, Mikihiro, Saeki Daisuke, Tsuru Toshinori, Moriyama Norihiro, Sakai Motomu
    THE MEMBRANE SOCIETY OF JAPAN, 2021, MEMBRANE, 46(2) (2), 98 - 111, Japanese

  • Development of Organic Solvent Hyper Filtration Membranes for Process Innovation
    松山 秀人, 小野 貴博, 加藤 典昭, 新谷 卓司, 中川 敬三, 吉岡 朋久
    Sep. 2020, 化学工学, 84(9) (9), 440 - 443, Japanese
    [Refereed][Invited]
    Introduction scientific journal

  • Shintani Takuji, Nakagawa Keizo, Yoshioka Tomohisa, Matsuyama Hideto
    Separation of organic solvent by membrane is an emerging technology for the purification or separation of organic solvents. In this study, game changing OHF (Organic solvent Hyper Filtration) membranes and their applications are under development to realize the replacement from energy–consuming distillation to energy–efficient membrane process. Nano filtration (NF)–type hollow fiber OHF membrane was developed by TIPS (Thermally–Induced Phase Separation) method using solvent–resistant polymers such as nylon 6. The prepared membranes showed methanol (MeOH) permeability of > 2 LMH (L・m–2・h–1) with molecular weight cut–off (MWCO) of about 1,000 and stability for >1 month. Reverse osmosis (RO)–type organic composite OHF membrane was developed by the interfacial polymerization method. A highly cross-linked polyamide layer was prepared on a solvent resistant support membrane. The membrane showed selectivity for MeOH against toluene (TOL) in separation test using MeOH/TOL mixture. Membrane performance was Rej.= 65% Flux = 16 LMH at 40 bar. The stability was > 2 weeks. NF–type TiO2/ZrO2 ceramic composite OHF membrane was developed using organic chelating ligands (OCL) as a pore size–fixing spacer. The membrane showed high permeability for organic solvents such as hexane (26 LMH) and MeOH (25 LMH) at 6 bar with MWCO of about 1,000 and stability of > 1 week. NF–type inorganic nanosheet OHF membrane was developed by laminating nanosheets of niobate and/or graphene oxide onto solvent resistant support membrane using chemical binders. The membrane showed relatively high MeOH permeability (11 LMH at 2 bar) and good rejection against organic dyes such as Evans blue (Mw : 960.8) with 87%.
    THE MEMBRANE SOCIETY OF JAPAN, 2020, MEMBRANE, 45(4) (4), 165 - 170, Japanese

  • Functions of Polymeric Additives in Thermally Induced Phase Separation Process of Poly(Vinylidene Difluoride)
    薮野洋平, 薮野洋平, 小松賢作, 新谷卓司, 中川敬三, 吉岡朋久
    2020, 膜, 45(6) (6)

  • NAKAGAWA Keizo

    Two-dimensional (2D) transition metal oxide nanosheets have useful characteristics such as high surface areas, and defined and controllable surface acidity, with potential for applications in solid acid catalysts and photocatalysts. The most common synthesis method to obtain 2D metal oxide nanosheets is the "exfoliation method" from the corresponding bulk layered oxide by the top-down approach. However, fragmentation and re-aggregation of nanosheets are some of the problems. In addition, this method requires calcination processes for the synthesis of layered compounds at high temperature and prolonged exfoliation treatment of the 2D crystal layer. In this study, layered titanate nanosheets and single layer niobate nanosheets were formed by the bottom-up approach utilizing hydrolysis and condensation of metal alkoxides in the presence of surfactants. Formation processes of the metal oxide nanosheets and effects of surface modification by the surfactants on their properties were studied. In addition, these nanosheets were evaluated for photocatalytic reactions such as photodegradation of organic dyes and hydrogen evolution from water decomposition. Composites of niobate nanosheets with other types of 2D nanosheets (graphene oxide and MoS2) achieved effective photocatalytic activities. Furthermore, stacked nanosheet membranes can be formed by assembling nanosheets. The nanosheet membranes have stable structures in water and high separation performance against aniomic dyes and salts, suggesting high potential as separation membranes.

    The Japan Petroleum Institute, 2019, Journal of the Japan Petroleum Institute, 62(2) (2), 53 - 60, English
    [Refereed][Invited]

  • Nakagawa Keizo

    Two dimensional (2D) nanosheet membranes have opened up a new avenue for fabricating size-selective molecular separation membranes, benefiting from their unique atomic thickness with micrometer lateral dimensions. Stacked nanosheet membranes are formed by assembling single molecular sheets into thin membranes, and contain 2D nanochannels between the stacked sheets that allow water or solvents to pass through whilst rejecting unwanted solutes. Therefore, they represent promising materials for potentially high-functional membranes for liquid separation such as water treatment and organic solvent filtration. In this study, we fabricated nanosheet membranes using single 2D nanosheets of metal oxide such as niobate nanosheets. The channel structure and application for water treatment and organic solvent filtration will be discussed.

    The Japan Petroleum Institute, 2019, Proceeding of Annual/Fall Meetings of the Japan Petroleum Institute, 2019(0) (0), 13 - 13, Japanese
    Summary national conference

  • 野村 幹弘, 山口 猛央, 高羽 洋充, 赤松 憲樹, 酒井 求, 吉岡 朋久, 稲田 飛鳥, 佐々木 雄史, 谷口 育雄, 長澤 寛規, 中川 敬三, 安川 政宏
    THE MEMBRANE SOCIETY OF JAPAN, 2019, MEMBRANE, 44(6) (6), 276 - 288, Japanese
    Meeting report

  • Nakagawa Keizo
    Two–dimensional (2D) nanosheet materials with unique atomic thickness have become emerging building blocks for separation membranes. Recently, the separation membranes utilizing a variety of 2D nanosheet materials have been developed, and their fabrication methods, membrane performances as well as permeation mechanisms have been demonstrated. In this review, recent developments of 2D nanosheet membranes for liquid separation with three basic forms: nanoporous membrane, layered membrane and hybrid membrane are summarized. The promising research areas are highlighted and future directions are briefly discussed.
    THE MEMBRANE SOCIETY OF JAPAN, 2019, MEMBRANE, 44(3) (3), 115 - 120, Japanese

  • 受賞講演 2017年度奨励賞 界面活性剤を用いたボトムアップ型2次元金属酸化物ナノシート触媒の開発 (特集 2017年度受賞講演(2))
    中川 敬三
    石油学会 ; 1978-, Oct. 2018, ペトロテック = Petrotech : 石油学会情報誌, 41(10) (10), 図巻頭1p,779 - 784, Japanese

  • Nakagawa, K., Inada, A., Kamio, E., Yoshioka, T., Matsuyama, H.
    繊維学会, May 2018, Journal of Fiber Science and Technology, 74(5) (5), P - 186-192, Japanese

  • Nakagawa Keizo
    本研究では界面活性剤を鋳型もしくは修飾剤として用い、金属アルコキシドの加水分解・重縮合反応による2D金属酸化物ナノシート材料のボトムアップ合成法を開発した。合成プロセスの提案や表面修飾効果を明らかとし、また異種物質との複合化による効果的な触媒機能の発現を明らかとした。さらに、積層することにより得られるナノシート薄膜が、水中で安定かつ高い分離機能を有することを見出した。
    The Japan Petroleum Institute, 2018, Proceeding of Annual/Fall Meetings of the Japan Petroleum Institute, 2018(0) (0), 20 - 20, Japanese

  • M. Nomura, H. Nagasawa, T. Miyata, K. Akamatsu, I. Taniguchi, T. Shintani, E. Kamio, S. Kanehashi, K. Nakagawa, T. Yoshioka, M. Yasukawa, H. Takaba, M. Sakai
    THE MEMBRANE SOCIETY OF JAPAN, 2018, MEMBRANE, 43(6) (6), 252 - 252, Japanese
    Meeting report

  • 澁谷真史, 中川敬三, 佐々木建吾, 近藤昭彦, 松山秀人
    01 Jan. 2018, 膜, 43(1) (1), 21‐26, Japanese

  • 環境を守り,エネルギーを生み出す夢の膜工学 1 膜工学研究の将来展望
    松山秀人, 松山秀人, 吉岡朋久, 神尾英治, 中川敬三
    日本化学会, Aug. 2017, 化学と工業, 70(8) (8), 678 - 680, Japanese

  • 中川敬三
    Two–dimensional nanosheet membranes have opened up a new avenue for fabricating size–selective molecular separation membranes, benefiting from their unique atomic thickness with micrometer lateral dimensions, high mechanical strength and chemical inertness. In this review, recent developments of nanoporous and stacked nanosheet membranes using such as graphene–based materials are summarized. Stacked niobate nanosheet membranes with a stable structure in water and good membrane performances are also introduced.
    THE MEMBRANE SOCIETY OF JAPAN, 01 Jul. 2017, 膜, 42(4) (4), 121‐127 - 127, Japanese

  • 中空糸膜モジュールのモジュール形状が浸透圧発電プロセスに与える影響
    田中裕大, 安川政宏, 合田昌平, 渋谷真史, 高橋智輝, 岸本通雅, 中川敬三, 新谷卓司, 比嘉充, 松山秀人
    2017, 化学工学会年会研究発表講演要旨集(CD-ROM), 82nd

  • Synthesis of Metal Oxide Nanosheets by a Bottom-up Approach Using Surfactants
    中川敬三, 杉山茂
    触媒学会, Dec. 2015, 触媒, 57(6) (6), 355 - 361, Japanese

  • リン系界面活性剤を利用したハイドロキシアパタイトナノ粒子の設計と構造評価
    吉田晶, 荒川裕佳, 中川敬三, 加藤雅裕, 杉山茂, 梶原靖子, 青柳里果
    19 Nov. 2015, 日本吸着学会研究発表会講演要旨集, 29th, 87, Japanese

  • 化学工学年鑑2015 6.反応工学
    西山覚, 渡部綾, 中川敬三, 堀江孝史, 原野安土, 佐藤鋼一, 筒井俊雄, 霜垣幸浩, 羽深等, 筑根敦弘, 松岡亮, 尾上薫
    05 Oct. 2015, 化学工学, 79(10) (10), 754 - 762, Japanese

  • MCM-41のイソブタンの酸化脱水素反応に対する触媒活性の改善
    永廣卓哉, 三栖央頌, 倉科昌, 中川敬三, 加藤雅裕, 杉山茂, 加藤裕樹, 二宮航
    2015, 化学工学会年会研究発表講演要旨集(CD-ROM), 80th

  • リン酸三カルシウム及びカルシウムヒドロキシアパタイト担持クロミア触媒によるイソブタンの酸化脱水素反応
    永廣卓哉, 中川敬三, 加藤雅裕, 杉山茂, 加藤裕樹, 二宮航
    2015, 無機リン化学討論会講演要旨集, 25th

  • Ehiro Takuya, Itagaki Ai, Nitta Yoshihisa, Nakagawa Keizo, Katoh Masahiro, Sugiyama Shigeru, Katou Yuuki, Akihara Shuji, Ninomiya Wataru
    FSM-16にクロムを導入した触媒は、イソブタンの酸化脱水素反応によるイソブテンの接触反応に高活性を示し、高活性酸化脱水素触媒であるマグネシウムバナデート等より優れた性能を示した。一方、この触媒を、メタンの酸化カップリング、エタンおよびプロパンの酸化脱水素反応に適応しても、高い触媒活性は得られなかった。本触媒系は直鎖炭化水素の酸化脱水素には有効でなく枝分かれした炭化水素に高い活性を示すことがわかった。
    The Japan Petroleum Institute, 2013, Proceeding of Annual/Fall Meetings of the Japan Petroleum Institute, 2013, 13 - 13, Japanese

  • International Collaborative Research for Development of Silica-coated Pd Catalysts : Sintering Resistance and Catalytic Property for CyclohexaneDdehydrogenation in Bach Reactor
    Nakagawa Keizo, Hoshinoo Tomoya, Sotowa Ken-Ichiro, Sugiyama Shigeru, Rkiouak Laylla, Dubois Vincent, Hermans Sophie
    Here we developed silica-coated Pd catalysts and applied to liquid phase catalytic reaction such as dehydrogenation of cyclohexane. Carbon black (CB)-supported Pd catalysts (Pd/CB) were covered with organosilica layers via the hydrolysis of phenyltriethoxysilane (PhTES). Coverage of Pd nanoparticles with organosilica layers suppressed particle sintering of Pd, as compared to the case of uncovered Pd/CB. The organosilica layers had hydrophobic properties because of the presence of phenyl groups. As a result, the organosilica-coated Pd catalysts prepared using PhTES showed superior catalytic performance for cyclohexane dehydrogenation, even after reduction at 623K under H2 atmosphere.
    The University of Tokushima, 2013, Bulletin of Institute of Technology and Science the University of Tokushima, 58(58) (58), 27 - 32, Japanese

  • Effects of Coverage of Metal Nanoparticles with Porous Silica Layers
    NAKAGAWA Keizo
    15 Jan. 2012, 觸媒 = Catalyst, 54(1) (1), 64 - 64, Japanese

  • SUGIYAMA Shigeru, BANDO Takuya, TANAKA Haruki, NAKAGAWA Keizo, SOTOWA Ken-Ichiro, KATOU Yuuki, MORI Takanori, YASUKAWA Toshiya, NINOMIYA Wataru
    The use of pressurized oxygen greatly enhanced catalytic activity for oxidative esterification of propionaldehyde to methyl propionate with methanol using heavy-metal-free Pd/C and Pd/Al2O3. For example, the conversion of propionaldehyde, the selectivity to methyl propionate, and the yield of the propionate using 5 % Pd/Al2O3 were 99.9, 62.7, and 62.6 %, respectively, at 1.5 MPa of oxygen gas and 333 K. This result demonstrated that Pb doping of Pd catalysts was not needed to achieve comparable activity, which runs contrary to previous reports, in which it had been suggested that loading of Pd catalysts using a heavy metal such as Pb was needed for the great activity such as 93.2, 76.8, and 71.6 % of the conversion of propionaldehyde, the selectivity to methyl propionate, and the yield of the propionate, respectively, at 0.3 MPa of oxygen gas and 353 K using 5 % Pd/Al2O3 doped with 5 % Pb.
    The Japan Petroleum Institute, 01 Nov. 2011, Journal of the Japan Petroleum Institute, 54(6) (6), 380 - 384, English

  • NAKAGAWA Keizo
    The coverage of metal particles with silica layers is an effective method to functionalize the surface of metal particles. One of the advantages of the coverage of silica layers is to enhance the stability of metal particles. Silica-coated metal nanoparticles can be applied to various catalytic reactions through the fine structure of silica layers. The development of functionalized silica layers which cover the metal particles would lead to an increase in their application for catalytic reactions. This report will describe the preparation process of silica-coated metal particles using several organosilanes and application to the catalytic reaction involving larger reactant molecules. Pt particles covered with functionalized silica layers have sintering resistance to thermal treatment and show superior catalytic activity for dehydrogenation of organic hydride.
    The Society of Powder Technology, Japan, 10 Jan. 2011, Journal of the Society of Powder Technology, Japan, 48(1) (1), 28 - 33, Japanese

  • Sugiyama Shigeru, Toyoda Saeko, Ogawa Shiro, Nakagawa Keizo, Sotowa Ken-Ichiro
    It is generally accepted that the conversion of ethanol to propylene favorably proceeds on Ni-doped FSM-16 together with Ni-doped MCM-41. However most of the studies on the conversion have been examined at a low concentration of ethanol by 1 kPa and the examination at a higher concentration of ethanol is needed for the purpose of practical use of the conversion. In the present study, a higher concentration of ethanol by 30 kPa is used for the conversion to reveal some problems under the reaction conditions.
    The Japan Petroleum Institute, 2011, Proceeding of Annual/Fall Meetings of the Japan Petroleum Institute, 2011, 33 - 33, Japanese

  • 小川 史郎, 中村 翔太, 中川 敬三, 外輪 健一郎, 杉山 茂, 小西 征則, 大久保 彰
    公益社団法人 化学工学会, 2010, 化学工学会 研究発表講演要旨集, 2010, 641 - 641, Japanese

  • 中川 敬三, 岡山 哲也, 谷本 裕亮, 外輪 健一郎, 杉山 茂
    公益社団法人 化学工学会, 2010, 化学工学会 研究発表講演要旨集, 2010, 598 - 598, Japanese

  • 南 敦士, 外輪 健一郎, 中川 敬三, 杉山 茂
    公益社団法人 化学工学会, 2010, 化学工学会 研究発表講演要旨集, 2010, 68 - 68, Japanese

  • 山口 和希, 中川 敬三, 外輪 健一郎, 杉山 茂
    公益社団法人 化学工学会, 2010, 化学工学会 研究発表講演要旨集, 2010, 232 - 232, Japanese

  • Preparation of Carbon-Supported Pt Catalysts Covered with Silica Layers and Application to Dehydrogenation Catalysts of Organic Hydride
    Nakagawa Keizo, Tanimoto Yusuke, Sotowa Ken-Ichiro, Sugiyama Shigeru
    Carbon-supported Pt metal nanoparticles covered with silica layer including phenyl or methyl groups were prepared using successive hydrolysis of 3-aminopropyl-triethoxysilane (APTES) and phenyltriethoxysilane (PhTES) or methyltriethoxysilane (MTES). The Pt catalyst covered with silica layers containing functional groups showed higher activity in the cyclohexane dehydrogenation, compared with Pt catalysts covered with a silica layer containing no functional groups, because the microporous structure of silica layers which wrapped Pt metal particles increased the diffusion capability of cyclohexane. The Pt/CB nanoparticles covered with microporous silica layers showed the high sintering resistance of Pt metal particles to thermal treatment at 973 K in a H2 atmosphere as compared with Pt/CB. As a result, this catalyst showed higher catalytic activity for cyclohexane dehydrogenation than Pt/CB after thermal treatment.
    The University of Tokushima, 2010, Bulletin of Institute of Technology and Science the University of Tokushima, 55(55) (55), 37 - 43, Japanese

  • 杉山 茂, 菊本 哲雄, 田中 春樹, 中川 敬三, 外輪 健一郎, 前原 桂子, 姫野 嘉之, 二宮 航
    公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 43 - 43, Japanese

  • 谷本 裕亮, 中川 敬三, 外輪 健一郎, 杉山 茂
    公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 44 - 44, Japanese

  • 外輪 健一郎, 山口 進太郎, 杉山 茂, 中川 敬三
    公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 73 - 73, Japanese

  • 中川 敬三, 山口 和希, 尾方 敏匡, 外輪 健一郎, 杉山 茂
    公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 320 - 320, Japanese

  • 山本 篤, 外輪 健一郎, 中川 敬三, 杉山 茂
    公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 71 - 71, Japanese

  • 久米 啓司, 外輪 健一郎, 杉山 茂, 中川 敬三
    公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 56 - 56, Japanese

  • 和田 隆宏, 小川 史郎, 加藤 裕樹, 中川 敬三, 外輪 健一郎, 杉山 茂
    公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 385 - 385, Japanese

  • 杉本 直登, 尾崎 あづさ, 中川 敬三, 外輪 健一郎, 杉山 茂
    公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 373 - 373, Japanese

  • 外輪 健一郎, 黒田 勝也, 奥山 大輔, 杉山 茂, 中川 敬三
    公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 238 - 238, Japanese

  • 山口 進太郎, 外輪 健一郎, 中川 敬三, 杉山 茂
    公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 53 - 53, Japanese

  • 山本 篤, 外輪 健一郎, 中川 敬三, 杉山 茂
    公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 54 - 54, Japanese

  • 山口 和希, 中川 敬三, 外輪 健一郎, 杉山 茂
    公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 1007 - 1007, Japanese

  • 尾方 敏匡, 中川 敬三, 外輪 健一郎, 杉山 茂
    公益社団法人 化学工学会, 2009, 化学工学会 研究発表講演要旨集, 2009, 1006 - 1006, Japanese

  • 黒田 勝也, 外輪 健一郎, 奥山 大輔, 中川 敬三, 杉山 茂
    公益社団法人 化学工学会, 2008, 化学工学会 研究発表講演要旨集, 2008, 738 - 738, Japanese

  • 加藤 裕樹, 和田 隆宏, 西岡 幸則, 中川 敬三, 外輪 健一郎, 杉山 茂
    公益社団法人 化学工学会, 2008, 化学工学会 研究発表講演要旨集, 2008, 763 - 763, Japanese

  • 山口 進太郎, 外輪 健一郎, 高木 要, 杉山 茂, 中川 敬三
    公益社団法人 化学工学会, 2008, 化学工学会 研究発表講演要旨集, 2008, 553 - 553, Japanese

  • 久米 啓司, 外輪 健一郎, 杉山 茂, 中川 敬三
    公益社団法人 化学工学会, 2008, 化学工学会 研究発表講演要旨集, 2008, 538 - 538, Japanese

  • 尾方 敏匡, 中川 敬三, 外輪 健一郎, 杉山 茂
    公益社団法人 化学工学会, 2008, 化学工学会 研究発表講演要旨集, 2008, 93 - 93, Japanese

  • 谷本 裕亮, 中川 敬三, 外輪 健一郎, 杉山 茂, 岸田 昌浩
    公益社団法人 化学工学会, 2008, 化学工学会 研究発表講演要旨集, 2008, 674 - 674, Japanese

  • 真鍋 智行, 中川 敬三, 外輪 健一郎, 杉山 茂
    公益社団法人 化学工学会, 2008, 化学工学会 研究発表講演要旨集, 2008, 873 - 873, Japanese

  • 石花 健太, 外輪 健一郎, 黒田 勝也, 中川 敬三, 杉山 茂
    公益社団法人 化学工学会, 2008, 化学工学会 研究発表講演要旨集, 2008, 273 - 273, Japanese

  • 杉山 茂, 清水 由佳, 中川 敬三, 外輪 健一郎
    公益社団法人 化学工学会, 2008, 化学工学会 研究発表講演要旨集, 2008, 245 - 245, Japanese

  • 久米 啓司, 外輪 健一郎, 中川 敬三, 杉山 茂
    公益社団法人 化学工学会, 2008, 化学工学会 研究発表講演要旨集, 2008, 239 - 239, Japanese

  • 上原 裕也, 菊本 哲雄, 中川 敬三, 外輪 健一郎, 杉山 茂, 前原 桂子, 安川 隼也, 姫野 嘉之, 二宮 航
    公益社団法人 化学工学会, 2008, 化学工学会 研究発表講演要旨集, 2008, 187 - 187, Japanese

  • 山本 篤, 外輪 健一郎, 中川 敬三, 杉山 茂
    公益社団法人 化学工学会, 2008, 化学工学会 研究発表講演要旨集, 2008, 240 - 240, Japanese

  • SUGIYAMA Shigeru, HIRATA Yuuki, OSAKA Takeshi, MORIGA Toshihiro, NAKAGAWA Keizo, SOTOWA Ken-Ichiro
    To evaluate the redox nature of magnesium vanadates during the oxidative dehydrogenation of propane, magnesium pyro- and othro-vanadates (Mg2V2O7 and Mg3V2O8, respectively) used for the conversion of propane with and without gaseous oxygen were analyzed by XRD, solid state 51V MAS NMR and XAFS. After the propane conversion without oxygen, complete conversion of those magnesium vanadates to the corresponding vanadate containing V4+ or V3+ species together with MgO was observed by XRD, while the reduction of V5+ was detected by 51V MAS NMR and V K-edge XAFS from those catalysts. However XRD and 51V MAS NMR revealed that re-oxidation of the reduced Mg3V2O8 resulted in the regeneration of the original phase together with that of a V5+ species, while the re-oxidation of the reduced Mg2V2O7 afforded a phase (triclinic system) different from the original one (monoclinic system), but, in which the V5+ species was regenerated from the reduced vanadium.
    The Ceramic Society of Japan, 01 Oct. 2007, Journal of the Ceramic Society of Japan, 115(1346) (1346), 667 - 671, English

  • Preparation of carbon-supported Pt catalysts covered with silica layers and application of their catalysts to PEFC
    TAKENAKA Sakae, MATSUMORI Hiroshi, KAWASHIMA Kenji, ARIKE Takafumi, NAKAGAWA Keizo, MATSUNE Hideki, KISHIDA Masahiro
    触媒学会, 05 Sep. 2007, 触媒 = Catalysts & Catalysis, 49(6) (6), 456 - 458, Japanese

  • 清水 由佳, 真鍋 智行, 中川 敬三, 外輪 健一郎, 杉山 茂
    公益社団法人 化学工学会, 2007, 化学工学会 研究発表講演要旨集, 2007, 699 - 699, Japanese

  • 外輪 健一郎, 黒田 勝也, 石花 健太, 杉山 茂, 中川 敬三
    公益社団法人 化学工学会, 2007, 化学工学会 研究発表講演要旨集, 2007, 64 - 64, Japanese

  • 中川 敬三, 松根 英樹, 竹中 壮, 岸田 昌浩
    公益社団法人 化学工学会, 2006, 化学工学会 研究発表講演要旨集, 2006, 111 - 111, Japanese

  • 中川 敬三, 北條 裕子, 松根 英樹, 竹中 壮, 岸田 昌浩
    公益社団法人 化学工学会, 2006, 化学工学会 研究発表講演要旨集, 2006, 670 - 670, Japanese

  • 中川 敬三, 王 富民, 村田 雄輔, 足立 基齊
    公益社団法人 化学工学会, 2005, 化学工学会 研究発表講演要旨集, 2005, 97 - 97, Japanese

  • 中川 敬三, 川原 直美, 松山 秀人, 寺本 正明
    公益社団法人 化学工学会, 2003, 化学工学会 研究発表講演要旨集, 2003, 565 - 565, Japanese

■ Books And Other Publications
  • ポストグラフェン材料の創製と用途開発最前線 ~二次元ナノシートの物性評価、構造解析、合成、成膜プロセス技術、応用展開~
    柚原淳司, 中川敬三, その他49名
    Contributor, 第III編 第3章 第3節 金属酸化物ナノシートを利用した積層型分離膜の開発, 株式会社エヌ・ティー・エス, Apr. 2020

  • Fabrication of Innovative Separation Membranes in Kobe University
    NAKAGAWA KEIZO, INADA ASUKA, KAMIO EIJI, YOSHIOKA TOMOHISA, MATSUYAMA HIDETO
    Joint work, Journal of the Society of Fiber Science and Technology, Japan, 2018, Japanese
    Scholarly book

■ Lectures, oral presentations, etc.
  • 酸化グラフェン層空間を利用した金属有機構造体ナノシートの形成による 高透水性ナノろ過膜の開発
    中川敬三, Zheng Wang, Kecheng Guan, 田中俊輔, 岡本泰直, 松岡 淳, 神尾英治, 吉岡朋久, 松山秀人
    膜シンポジウム2024, Nov. 2024, Japanese
    Oral presentation

  • Construction of two-dimensional nanochannel reaction space for catalytic applications
    Keizo Nakagawa
    Victoria Univ – Kobe Univ international collaborative reasearch seminar, Aug. 2024, English
    Public discourse

  • 2D heterostructured nanochannels in laminar membrane for molecular separation and catalytic reaction
    Keizo Nakagawa
    14th conference of the Aseanian Membrane Society (AMS14), Jul. 2024, English
    [Invited]
    Keynote oral presentation

  • Two-dimensional MoS2 nanochannel as a membrane reactor for continuous catalytic reaction
    Keizo Nakagawa
    NSFC-JSPS (China-Japan) Bilateral Joint Project Symposium 2024, Jul. 2024, English
    Public discourse

  • フッ素含有シリカで修飾された多孔質ポリケトン膜によるW/Oエマルション分離
    中川敬三, 渡辺智貴, 北河享, 岡本泰直, 松岡淳, 神尾英治, 吉岡朋久, 松山秀人
    日本膜学会第46年会, Jun. 2024, Japanese
    Oral presentation

  • Pretreatment of high strength wastewater prior to ammoniacal nitrogen enrichment
    Nakagawa Keizo, Gonzales Ralph Rolly, Hasegawa Susumu, Kumagai Kazuo, Yoshioka Tomohisa, Matsuyama Hideto
    化学工学会第89年会, Mar. 2024, Japanese
    Oral presentation

  • 2次元ヘテロ構造ナノチャネルを有するHNb3O8/g-C3N4ナノシート複合光触媒膜の開発
    中川 敬三, 井元 誠志, Hu Chechia, 吉岡 朋久, 松岡 淳, 神尾 英治, 松山 秀人
    化学工学会第89年会, Mar. 2024, Japanese
    Oral presentation

  • ナノシート積層型光触媒膜の異種ナノシート界⾯における蛍光挙動の解析
    中川敬三
    令和5年度神戸大学分子フォトサイエンス研究センター共同研究成果報告会, Mar. 2024, Japanese
    Public discourse

  • MoS2ナノシート膜の二次元ナノチャネルを利用したp-ニトロフェノールの連続触媒還元反応
    中川敬三, 上野拓洋, Zheng Wang, 吉岡朋久, Jiri Kulhavy, 谷屋啓太, 松岡 淳, 神尾英治, Shik Chi Edman Tsang, 松山秀人
    日本膜学会「第45年会」・「膜シンポジウム2023」合同大会, Nov. 2023, Japanese
    Oral presentation

  • 有機溶剤膜分離による高効率化学・バイオプロセスの構築
    中川 敬三, 北河 享, 吉岡 朋久
    2023 年度 神戸大学大学院 科学技術イノベーション研究科 年次定例シンポジウム, Nov. 2023, Japanese
    Nominated symposium

  • Nanosheet based photocatalytic membrane reactor with two dimensional heterostructured nanochannels for efficient water treatment
    Keizo NAKAGAWA, Seiji IMOTO, K, Chechia HU, Tomohisa YOSHIOKA, Atsushi MATSUOKA, Eiji KAMIO, Takashi TACHIKAWA, Ko, Shik Chi Edman, TSANG, Hideto MATSUYAMA
    The 12th International Conference on Separation Science and Technology (ICSST23), Nov. 2023, English
    Oral presentation

  • ナノシート積層薄膜の開発と膜分離・触媒反応への応用
    中川敬三
    第9回神戸大学先端膜工学拠点Workshop, Oct. 2023, Japanese
    [Invited]
    Nominated symposium

  • Development of laminar HNb3O8/g-C3N4 nanosheet photocatalytic membrane reactor with two-dimensional heterostructured nanochannels,
    K. Nakagawa, S. Imoto, C. Hu, T. Yoshioka, T. Shintani, A. Matsuoka, E. Kamio, T. Tachikawa, S.C.E. Tsang, H. Matsuyama
    International Congress on Membranes and Membrane Processes (ICOM) 2023, Jul. 2023, English
    Oral presentation

  • Two-dimensional heterostructured nanochannels for nanosheet photocatalytic membrane reactor
    Keizo Nakagawa
    3rd JSPS-NSFC (JPN-CHN) Bilateral Program coreserach symposium, Jul. 2023, English
    Nominated symposium

  • 正浸透膜の選択透過性制御による バイオエタノール生産の効率化 ~科学技術イノベーション研究科×先端膜工学研究センター×先端バイオ工学研究センター~
    中川 敬三, 北河 享, 吉岡 朋久
    2022 年度 神戸大学大学院 科学技術イノベーション研究科 年次定例シンポジウム, Nov. 2022, English
    Nominated symposium

  • 2D laminar membranes with enhanced anti-swelling property for organic solvent nanofiltration
    Keizo Nakagawa
    2nd JSPS-NSFC (JPN-CHN) Bilateral Program coreserach symposium, Aug. 2022, English
    Nominated symposium

  • Development of HNb3O8/g-C3N4 nanosheet composite photocatalytic membranes with improved water permeance and photocatalytic activity
    Keizo Nakagawa, Seiji Imoto, Chechia Hu, Tomohisa Yoshioka, Takuji Shintani, Atsushi Matsuoka, Eiji Kamio, Shik Chi, Edman Tsang, Hideto Matsuyama
    15th International Conference on Catalysis in Membrane Reactors (ICCMR-15), Aug. 2022, English
    [Invited]
    Invited oral presentation

  • Laminar HNb3O8/g-C3N4 composite membranes with photocatalytic antifouling property for water treatment
    K. Nakagawa, S. Imoto, C. Hu, T. Yoshioka, T. Shintani, A. Matsuoka, E. Kamio, S. C. E. Tsang, H. Matsuyama
    The 13th Conference of the Aseanian Membrane Society (AMS13), Jul. 2022, English
    Oral presentation

  • Development of Laminar HNb3O8-Based Membranes with Enhanced Anti-Swelling Property for Organic Solvent Nanofiltration
    Keizo Nakagawa, Misato Kunimatsu, Kengo Yasui, Tomohisa Yoshioka, Takuji Shintani, Eiji Kamio, Kuo-Lun Tung, Shik Chi Edman Tsang, Hideto Matsuyama
    The 16th International Conference on Inorganic Membranes (ICIM 16), Jun. 2022, English
    [Invited]
    Invited oral presentation

  • 耐膨潤性を有するHNb3O8系ナノシート積層膜の作製と有機溶剤ナノろ過特性
    中川敬三, 國松美里, 安井健悟, 吉岡朋久, 新谷卓司, 神尾英治, 松山秀人
    日本膜学会第44 年会, Jun. 2022, Japanese
    Oral presentation

  • Advancing Metal Oxide-based Laminar Membranes :Water treatment and Organic Solvent Filtration
    Keizo NAKAGAWA
    International Membrane Conference in Taiwan 2021, Oct. 2021, English
    [Invited]
    Keynote oral presentation

  • Two-dimensional nanomaterial-based membranes for water treatment and organic solvent filtration
    Keizo Nakagawa
    Online Lecture Series on "Nanoscience and Nanotechnology" (The Hong Kong Polytechnic University), Aug. 2021, English
    [Invited]
    Public discourse

  • 2次元ナノチャネルを有するナノシート積層膜の開発
    中川敬三, Kecheng Guan, 松山秀人
    第15回酸化グラフェン研究会, Jun. 2021, Japanese
    [Invited]
    Invited oral presentation

  • バイオ生産のための原材料の膜による分離精製
    中川敬三
    第1回先端膜工学研究推進機構特定テーマフォーラム~医薬・バイオプロセスにおける膜利用の現状と将来展望~, Dec. 2020, Japanese
    [Invited]
    Invited oral presentation

  • Fabrication of niobate nanosheet-graphene oxide composite membranes and their organic solvent nanofiltration performance
    Keizo NAKAGAWA, Misato KUNIMATSU, Tomohisa YOSHIOKA, Takuji SHINTANI, Eiji KAMIO, Hideto MATSUYAMA
    International Congress on Membranes & Membrane Processes 2020 (ICOM2020), English
    Oral presentation

  • 界面緻密層を有するレイヤー型複合ナノシート積層膜の作製とナノろ過特性
    中川敬三, 國松美里, 吉岡朋久, 新谷卓司, 神尾英治, 松山秀人
    膜シンポジウム2020, Nov. 2020, Japanese
    Oral presentation

  • TiO2-ZrO2-有機キレート配位子(OCL)複合膜の有機溶剤ナノろ過特性
    家迫遼介, 吉岡朋久, 中川敬三, 新谷卓司, 神尾英治, 松山秀人
    化学工学会第85年会, Mar. 2020, Japanese, 化学工学会, 大阪府, Domestic conference
    Poster presentation

  • 圧力支援法によるMoS2ナノシート積層膜の作製とナノろ過特性の評価
    釆尾崇哉, 中川敬三, Shik Chi Edman Tsang, 新谷卓司, 神尾英治, 松山秀人, 吉岡朋久
    化学工学会第85年会, Mar. 2020, Japanese, 化学工学会, 大阪府, Domestic conference
    Poster presentation

  • 有機キレート配位子を用いたTiO2-SiO2膜の作製と気体透過特性評価
    安成竜輝, 吉岡朋久, 中川敬三, 新谷卓司, 神尾英治, 松山秀人
    化学工学会第85年会, Mar. 2020, Japanese, 化学工学会, 大阪府, Domestic conference
    Poster presentation

  • 分子シミュレーションを用いたポリアミド膜に対する低分子量物質のファウリング機構解明
    川端優希, 吉岡朋久, 中川敬三, 新谷卓司, 松山秀人
    化学工学会第85年会, Mar. 2020, Japanese, 化学工学会, 大阪府, Domestic conference
    Poster presentation

  • シリカ担持触媒を用いたMCH脱水素反応および触媒膜の作製
    山田 雛乃, 中川敬三, 新谷卓司, 神尾英治, 松山秀人, 吉岡朋久
    化学工学会第85年会, Mar. 2020, Japanese, 化学工学会, 大阪府, Domestic conference
    Poster presentation

  • 分子動力学シミュレーションを用いた酸化グラフェン積層膜の透過機構解明
    安井健悟, 吉岡朋久, 中川敬三, 新谷卓司, 神尾英治, 松山秀人
    化学工学会第85年会, Mar. 2020, Japanese, 化学工学会, 大阪府, Domestic conference
    Poster presentation

  • 合成有機化合物の分離精製のための新規NF膜及びプロセス開発
    角南俊輔, 新谷卓司, 中川敬三, 佐々木雄史, 松山秀人, 吉岡朋久
    化学工学会第85年会, Mar. 2020, Japanese, 化学工学会, 大阪府, Domestic conference
    Poster presentation

  • FOファウリングでの透水挙動に及ぼすファウラント組成の影響
    松葉真由, 中川敬三, 新谷卓司, 吉岡朋久, 長谷川進, 佐々木雄史, 神尾英治, 松山秀人
    化学工学会第85年会, Mar. 2020, Japanese, 化学工学会, 大阪府, Domestic conference
    Poster presentation

  • 分子動力学法によるゼオライト膜における分離透過メカニズム解析と高性能膜の設計
    植田 敬文, 吉岡 朋久, 中川 敬三, 新谷 卓司, 神尾 英治, 松山 秀人
    第22回化学工学会学生発表会(岡山大会), 2020, Japanese, 化学工学会, 岡山県, Domestic conference
    Oral presentation

  • アミン系架橋剤を利用した積層型酸化グラフェン膜の作製と有機溶剤ナノろ過特性の評価
    牛尾 海, 中川 敬三, 吉岡 朋久, 新谷 卓司, 神尾 英治, 松山 秀人
    第22回化学工学会学生発表会(岡山大会), 2020, Japanese, 化学工学会, 岡山県, Domestic conference
    Oral presentation

  • 界面重縮合反応を用いたフッ素含有ポリアミド膜の作製と水及び有機溶剤の透過性評価
    串田 航, 新谷 卓司, 中川 敬三, 佐々木 雄史, 長谷川 進, 神尾 英治, 松山秀人
    第22回化学工学会学生発表会(岡山大会), 2020, Japanese, 化学工学会, 岡山県, Domestic conference
    Oral presentation

  • 有機キレート配位子を利用したチタニア-ジルコニア複合膜の細孔径制御
    家迫 遼介, 吉岡 朋久, 中川 敬三, 新谷 卓司, 神尾 英治, 松山 秀人
    化学工学会姫路大会2019, Dec. 2019, Japanese, 化学工学会, 兵庫県, Domestic conference
    Oral presentation

  • 担持Pt触媒を用いたシリカ系触媒膜の作製とメチルシクロヘキサン脱水素反応の評価
    山田 雛乃, 中川 敬三, 新谷 卓司, 神尾 英治, 松山 秀人, 吉岡 朋久
    化学工学会姫路大会2019, Dec. 2019, Japanese, 化学工学会関西支部, 兵庫県, Domestic conference
    Oral presentation

  • 分子動力学シミュレーションを用いた酸化グラフェン積層膜の透過・分離機構の解明
    安井 健悟, 吉岡 朋久, 中川 敬三, 新谷 卓司, 神尾 英治, 松山 秀人
    化学工学会姫路大会2019, Dec. 2019, Japanese, 化学工学会関西支部, 兵庫県, Domestic conference
    Oral presentation

  • 二次成長法によるナノシート膜上へのCuBDC MOF膜の作製
    小野山真之, 中川敬三, 田中俊輔, 新谷卓司, 神尾英治, 松山秀人, 吉岡朋久
    膜シンポジウム2019, Nov. 2019, Japanese, 日本膜学会, 大阪府, Domestic conference
    Poster presentation

  • Pt含有酸化グラフェン積層膜の作製とp-ニトロフェノール還元反応における触媒活性評価
    塩野颯斗, 中川敬三, 新谷卓司, 神尾英治, 松山秀人, 吉岡朋久
    膜シンポジウム2019, Nov. 2019, Japanese, 日本膜学会, 大阪府, Domestic conference
    Poster presentation

  • MoS2ナノシート積層膜の作製と加圧処理が及ぼす膜性能への影響
    釆尾崇哉, 中川敬三, Shik Chi Edman Tsang, 新谷卓司, 神尾英治, 松山秀人, 吉岡朋久
    膜シンポジウム2019, Nov. 2019, Japanese, 日本膜学会, 大阪府, Domestic conference
    Poster presentation

  • 界面活性剤の分離精製における新規NF膜及びプロセス開発
    角南俊輔, 新谷卓司, 中川敬三, 佐々木雄史, 松山秀人, 吉岡朋久
    膜シンポジウム2019, Nov. 2019, Japanese, 日本膜学会, 大阪府, Domestic conference
    Poster presentation

  • 分子動力学法による有機溶剤のTiO2膜ナノ細孔における透過現象の解析
    小原 侑也, 吉岡朋久, 中川敬三, 新谷卓司, 神尾英治, 松山秀人
    膜シンポジウム2019, Nov. 2019, Japanese, 日本膜学会, 大阪府, Domestic conference
    Poster presentation

  • 芳香族系有機キレート剤を用いたTiO2-ZrO2複合ガス分離膜の作製と透過特性評価
    橘 高志, 吉岡朋久, 中川敬三, 新谷卓司, 神尾英治, 松山秀人
    膜シンポジウム2019, Nov. 2019, Japanese, 日本膜学会, 大阪府, Domestic conference
    Poster presentation

  • 層間が架橋された酸化グラフェン積層膜の開発
    牛尾海, 中川敬三, 吉岡朋久, 新谷卓司, 神尾英治, 松山秀人
    第18回無機膜研究会「プロセス開発に向けた無機膜研究の基礎から応用」, Oct. 2019, Japanese, 化学工学会分離プロセス部会膜工学分科会化学工学会反応工学部会反応分離分科会, 岐阜県, Domestic conference
    Poster presentation

  • 分子動力学法によるMFI型ゼオライト膜の吸着・拡散性の評価
    植田敬文, 吉岡朋久, 中川敬三, 新谷卓司, 松山秀人
    第18回無機膜研究会「プロセス開発に向けた無機膜研究の基礎から応用」, Oct. 2019, Japanese, 化学工学会分離プロセス部会膜工学分科会化学工学会反応工学部会反応分離分科会, 岐阜県, Domestic conference
    Poster presentation

  • 水処理膜における膜ファウリングメカニズムの解明
    松葉真由, 中川敬三, 新谷卓司, 吉岡朋久, 佐々木雄史, 神尾英治, 松山秀人
    第18回無機膜研究会「プロセス開発に向けた無機膜研究の基礎から応用」, Oct. 2019, Japanese, 化学工学会分離プロセス部会膜工学分科会化学工学会反応工学部会反応分離分科会, 岐阜県, Domestic conference
    Poster presentation

  • 有機キレート配位子を用いたSiO2-TiO2複合膜材料の開発
    安成竜輝, 吉岡朋久, 中川敬三, 新谷卓司, 神尾英治, 松山秀人
    第18回無機膜研究会「プロセス開発に向けた無機膜研究の基礎から応用」, Oct. 2019, Japanese, 化学工学会分離プロセス部会膜工学分科会化学工学会反応工学部会反応分離分科会, 岐阜県, Domestic conference
    Poster presentation

  • Development of novel organic solvent resistant RO membrane
    Ayane HIROSUE, Takuji SHINTANI, Keizo NAKAGAWA, Yuji SASAKI, Susumu HASEGAWA, Tomohisa YOSHIOKA, Hideto MATSUYAMA
    The 18th Asian Pacific Confederation of Chemical Engineering Congress, Sep. 2019, English, The Society of Chemical Engineers, Japan, Sapporo, Japan, International conference
    Poster presentation

  • Molecular dynamics simulation of organic solvent permeation in nanoporous TiO2 membranes
    Yuya OHARA, Tomohisa YOSHIOKA, Keizo NAKAGAWA, Takuji SHINTANI, Eiji KAMIO, Hideto MATSUYAMA
    The 18th Asian Pacific Confederation of Chemical Engineering Congress, Sep. 2019, English, The Society of Chemical Engineers, Japan, Sapporo, Japan, International conference
    Poster presentation

  • Molecular dynamics study of CO3-absorbed ionic liquid structures and diffusivity
    Yusaku EBINA, Tomohisa YOSHIOKA, Keizo NAKAGAWA, Takuji SHINTANI, Eiji KAMIO, Hideto MATSUYAMA, Koseki SUGIYAMA
    The 18th Asian Pacific Confederation of Chemical Engineering Congress, Sep. 2019, English, The Society of Chemical Engineers, Japan, Sapporo, Japan, International conference
    Poster presentation

  • Fabrication of CuBDC MOF nanosheet laminated membrane by suction filtration
    Masayuki ONOYAMA, Keizo NAKAGAWA, Takuji SHINTANI, Eiji KAMIO, Hideto MATSUYAMA, Tomohisa YOSHIOKA
    The 18th Asian Pacific Confederation of Chemical Engineering Congress, Sep. 2019, English, The Society of Chemical Engineers, Japan, Sapporo, Japan, International conference
    Poster presentation

  • Improvement in pressure resistance by structure control of porous polyketone membrane for pressure retarded osmosis
    Kiyohito UCHIDA, Keizo NAKAGAWA, Takuji SHINTANI, Tomohisa YOSHIOKA, Susumu HASEGAWA, Yuji SASAKI, Eiji KAMIO, Hideto MATSUYAMA
    The 18th Asian Pacific Confederation of Chemical Engineering Congress, Sep. 2019, English, The Society of Chemical Engineers, Japan, Sapporo, Japan, International conference
    Poster presentation

  • Fabrication of graphene oxide membranes on porous α-alumina support by pressure assisted method
    Hayato SHIONO, Keizo NAKAGAWA, Takuji SHINTANI, Eiji KAMIO, Hideto MATSUYAMA, Tomohisa YOSHIOKA
    The 18th Asian Pacific Confederation of Chemical Engineering Congress, Sep. 2019, English, The Society of Chemical Engineers, Japan, Sapporo, Japan, International conference
    Poster presentation

  • Gas permeation properties of TiO2-ZrO3-Gallate nanocomposite porous membranes,
    Takashi TACHIBANA, Tomohisa YOSHIOKA, Keizo NAKAGAWA, Takuji SHINTANI, Eiji KAMIO, Hideto MATSUYAMA
    The 18th Asian Pacific Confederation of Chemical Engineering Congress, Sep. 2019, English, The Society of Chemical Engineers, Japan, Sapporo, Japan, International conference
    Poster presentation

  • Evaluation of pore size distribution of microporous ceramic membranes by micropore ?lling phase permeation method using various condensable gases
    Yu OGAWA, Tomohisa YOSHIOKA, Keizo NAKAGAWA, Takuji. SHINTANI, Eiji KAMIO, Hideto MATSUYAMA
    The 18th Asian Pacific Confederation of Chemical Engineering Congress, Sep. 2019, English, The Society of Chemical Engineers, Japan, Sapporo, Japan, International conference
    Poster presentation

  • Effect of composite membrane structure on performance of graphene oxide/metal oxide nanosheets composite membranes
    Misato KUNIMATSU, Keizo NAKAGAWA, Tomohisa YOSHIOKA, Takuji SHINTANI, Eiji KAMIO, Hideto MATSUYAMA
    The 18th Asian Pacific Confederation of Chemical Engineering Congress, Sep. 2019, English, The Society of Chemical Engineers, Japan, Sapporo, Japan, International conference
    Poster presentation

  • Fabrication of niobium oxide based nanosheet membranes and their nanofiltration performance in water and alcohol
    Keizo NAKAGAWA, Misato KUNIMATSU, Tomohisa YOSHIOKA, Takuji SHINTANI, Eiji KAMIO, Hideto MATSUYAMA
    The 18th Asian Pacific Confederation of Chemical Engineering Congress, Sep. 2019, English, The Society of Chemical Engineers, Japan, Sapporo, Japan, International conference
    Oral presentation

  • Molecular dynamics simulation of FO/RO water permeation in amphotericin B water channel
    Tomohisa YOSHIOKA, Keisuke Kotaka, Keizo NAKAGAWA, Takuji SHINTANI, Takahiro KAWAKATSU, Yu FUJIMURA, Hao-Chen WU, Hideto MATSUYAMA
    The 18th Asian Pacific Confederation of Chemical Engineering Congress, Sep. 2019, English, The Society of Chemical Engineers, Japan, Sapporo, Japan, International conference
    Oral presentation

  • Development of the novel nanofiltration membrane for separating divalent cation and divalent anion in the electrodialysis drainage
    Takuji SHINTANI, Shinnosuke HAMADA, Kazuki AKAMATSU, Tomoki TAKAHASHI, Keizo NAKAGAWA, Hideto MATSUYAMA, Tomohisa YOSHIOKA
    AMS12 (12th Conference of the Aseanian Membrane Society), Jul. 2019, English, Aseanian Membrane Society, Jeju, Korea, International conference
    Poster presentation

  • 炭素電極を用いた容量性脱イオンおよび膜容量性脱イオン
    川端優希, 塩冶一馬, 中川敬三, 新谷卓司, 吉岡朋久, 清野竜太郎
    分離技術会年会2019, May 2019, Japanese, The Society of Separation Process Engineering, Japan, Nagoya Institute of Technology, Nagoya, Domestic conference
    Poster presentation

  • ニオブ酸化物ナノシート/酸化グラフェン複合型積層膜の作製とナノろ過特性の評価
    國松美里, 中川敬三, 吉岡朋久, 新谷卓司, 神尾英治, 松山秀人
    分離技術会年会2019, May 2019, Japanese, The Society of Separation Process Engineering, Japan, Nagoya Institute of Technology, Nagoya, Domestic conference
    Poster presentation

  • ミクロ孔充填相透過法を用いた多孔性セラミック膜の細孔径分布評価
    小川祐生, 吉岡朋久, 中川敬三, 新谷卓司, 神尾英治, 松山秀人
    分離技術会年会2019, May 2019, Japanese, The Society of Separation Process Engineering, Japan, Nagoya Institute of Technology, Nagoya, Domestic conference
    Oral presentation

  • 活性炭素繊維電極を用いた膜容量性脱イオン
    川端優希, 塩冶一馬, 中川敬三, 新谷卓司, 吉岡朋久, 清野竜太郎
    日本膜学会第41年会, 2019, Japanese, The Membrane Society of Japan, Waseda Univeristy, Tokyo, Domestic conference
    Poster presentation

  • 有機キレート配位子を鋳型にしたチタニア-ジルコニア複合ナノろ過膜の有機溶剤透過・分画特性評価
    家迫遼介, 吉岡朋久, 中川敬三, 新谷卓司, 神尾英治, 松山秀人
    日本膜学会第41年会, 2019, Japanese, The Membrane Society of Japan, Waseda Univeristy, Tokyo, Domestic conference
    Poster presentation

  • 架橋型酸化グラフェン積層膜および酸化グラフェン/ニオブ酸化物ナノシート複合積層膜の作製とナノろ過性能の比較検討
    中川敬三, 國松美里, 荒屋伸太朗, 吉岡朋久, 新谷卓司, 神尾英治, 松山秀人
    日本膜学会第41年会, 2019, Japanese, The Membrane Society of Japan, Waseda Univeristy, Tokyo, Domestic conference
    Oral presentation

  • Development of Stacked Metal Oxide Nanosheet Membranes for Water Treatment
    Nakagawa Keizo
    Advanced Hybrid Materials and Membrane Separation Symposium, May 2019, English, Chung Yuan Christian University, International conference
    Keynote oral presentation

  • 有機溶媒耐性を有する新規PA-TFC膜の開発
    廣末 絢音, SHINTANI TAKUJI, NAKAGAWA KEIZO, SASAKI YUJI, HASEGAWA Susumu, MATSUYAMA HIDETO, YOSHIOKA TOMOHISA
    化学工学会第84.年会, Mar. 2019, Japanese, 化学工学会, 芝浦工業大学, Domestic conference
    Poster presentation

  • 有機キレート配位子を鋳型とする多孔性TiO2-ZrO2ナノろ過膜の細孔径評価と分画特性
    YOSHIOKA TOMOHISA, 貞 佑樹, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    化学工学会第84.年会, Mar. 2019, Japanese, 化学工学会, 芝浦工業大学, Domestic conference
    Oral presentation

  • 分子シミュレーションによるイオン液体中の二酸化炭素拡散性評価
    海老名 祐作, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    化学工学会第84.年会, Mar. 2019, Japanese, 化学工学会, 芝浦工業大学, Domestic conference
    Poster presentation

  • 電気透析排水から2価陽イオンと2価陰イオンを選択分離する新規ナノ濾過膜の開発
    濵田 慎之介, SHINTANI TAKUJI, 赤松 憲樹, NAKAGAWA KEIZO, SASAKI YUJI, HASEGAWA Susumu, MATSUYAMA HIDETO, YOSHIOKA TOMOHISA
    日本海水学会若手会第10回学生研究発表会, Mar. 2019, Japanese, 日本海水学会若手会, 旧佐世保鎮守府凱旋記念館, Domestic conference
    Poster presentation

  • 高分子膜を利用した正浸透法における膜ファウリング特性
    岡本 将尚, NAKAGAWA KEIZO, SHINTANI TAKUJI, YOSHIOKA TOMOHISA, HASEGAWA Susumu, SASAKI YUJI, KAMIO EIJI, MATSUYAMA HIDETO
    化学工学会第84.年会, Mar. 2019, Japanese, 化学工学会, 芝浦工業大学, Domestic conference
    Poster presentation

  • 計算機支援による水および有機溶剤のナノ空間における分子拡散現象の解析
    小原 侑也, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, MATSUYAMA HIDETO
    化学工学会第84.年会, Mar. 2019, Japanese, 化学工学会, 芝浦工業大学, Domestic conference
    Poster presentation

  • 吸引ろ過法を利用したCuBDC MOFナノシート積層膜の作製
    小野山 真之, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO, YOSHIOKA TOMOHISA
    化学工学会第84.年会, Mar. 2019, Japanese, 化学工学会, 芝浦工業大学, Domestic conference
    Poster presentation

  • 圧力支援法を用いた多孔質アルミナ管上への酸化グラフェン積層膜の作製
    塩野 颯斗, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO, YOSHIOKA TOMOHISA
    化学工学会第84.年会, Mar. 2019, Japanese, 化学工学会, 芝浦工業大学, Domestic conference
    Poster presentation

  • ポリケトン支持膜の構造制御による耐圧性と正浸透膜における透水性への影響
    内田 聖人, NAKAGAWA KEIZO, SHINTANI TAKUJI, YOSHIOKA TOMOHISA, 長谷川 進, SASAKI YUJI, KAMIO EIJI, MATSUYAMA HIDETO
    化学工学会第84.年会, Mar. 2019, Japanese, 化学工学会, 芝浦工業大学, Domestic conference
    Poster presentation

  • チタニア・ジルコニア複合ナノろ過膜の作製と有機溶剤透過性評価
    家迫 遼介, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    第21回化学工学会学生発表会(京都大会), Mar. 2019, Japanese, 公益社団法人化学工学会, 京都, Domestic conference
    Oral presentation

  • アルカノールアミンで架橋されたGO積層膜の透水性能と塩阻止性
    荒屋 伸太朗, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO, YOSHIOKA TOMOHISA
    化学工学会第84.年会, Mar. 2019, Japanese, 化学工学会, 芝浦工業大学, Domestic conference
    Poster presentation

  • TiO2-ZrO2-Gallateナノ複合多孔膜の細孔構造と気体透過特性評価
    橘 高志, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    化学工学会第84.年会, Mar. 2019, Japanese, 化学工学会, 芝浦工業大学, Domestic conference
    Poster presentation

  • MoS2ナノシートを用いた積層膜の作製と製膜法による積層構造の変化
    釆尾 崇哉, NAKAGAWA KEIZO, YOSHIOKA TOMOHISA, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    第21回化学工学会学生発表会(京都大会)+H31:K31, Mar. 2019, Japanese, 公益社団法人化学工学会, 京都, Domestic conference
    Oral presentation

  • Preparation of polyamide thin film composite forward osmosis membranes using hydrophilic PVDF and PSF hollow fibers modified by PVA perdiffusion method
    Youhei YABUNO, K. Mihara, K. Komatsu, S. Shimamura K. Nakagawa, T. Shintani, H. Matsuyama, T. Yoshioka
    AMS12 (12th Conference of the Aseanian Membrane Society), Jul. 2019, English, Aseanian Membrane Society, Jeju, Korea, International conference
    Oral presentation

  • The nanofiltration property of stacked nanosheet composite membrane incorporating graphene oxide into metal oxide membrane
    Misato KUNIMATSU, Keizo NAKAGAWA, Tomohisa YOSHIOKA, Takuji SHINTANI, Eiji KAMIO, Hideto MATSUYAMA
    AMS12 (12th Conference of the Aseanian Membrane Society), Jul. 2019, English, Aseanian Membrane Society, Jeju, Korea, International conference
    Poster presentation

  • Evaluation of Pore Size Distribution of Microporous Ceramic Membranes by Gas Permeation and Micropore Filling Phase Permeation Method
    Yu OGAWA, Tomohisa YOSHIOKA, Keizo NAKAGAWA, Takuji SHINTANI, Eiji KAMIO, Hideto MATSUYAMA
    AMS12 (12th Conference of the Aseanian Membrane Society), Jul. 2019, English, Aseanian Membrane Society, Jeju, Korea, International conference
    Poster presentation

  • Fabrication of forward osmosis membrane with improved pressure resistance using structure-controlled porous polyketone support membrane
    Keizo NAKAGAWA, K. Uchida, J. Wu, T. Shintani, T. Yoshioka, L. F. Fang, S. Hasegawa, Y. Sasaki, E. Kamio, H. Matsuyama
    AMS12 (12th Conference of the Aseanian Membrane Society), Jul. 2019, English, Aseanian Membrane Society, Jeju, Korea, International conference
    Poster presentation

  • Nanofiltration characteristics of organic chelate ligand (OCL)-templated microporous TiO2-ZrO2 membranes
    Tomohisa YOSHIOKA, Yuki SADA, Keizo NAKAGAWA, Takuji SHINTANI, Eiji KAMIO, Hideto MATSUYAMA
    AMS12 (12th Conference of the Aseanian Membrane Society), Jul. 2019, English, Aseanian Membrane Society, Jeju, Korea, International conference
    Oral presentation

  • 分子シミュレーションによるAmphotericin B-Ergosterolとポリアミド膜のFO透水性能比較Comparison of Forward Osmosis Water Permeability of Amphotericin B-Ergosterol and Polyamide Membrane by Molecular Simulation
    Keisuke Kotaka, Tomohisa Yoshioka, Keizo Nakagawa, Takuji Shintani, Takahiro Kawakatsu, Yu Fujimura, WU HAO CHEN, Daisuke. Saeki, Hideto Matsuyama
    第28回日本MRS年次大会, Dec. 2018, Japanese, 北九州国際会議場・西日本総合展示場, Domestic conference
    Poster presentation

  • ポリケトン支持膜のアミン修飾による膜構造や耐圧性の影響
    内田 聖人, NAKAGAWA KEIZO, SHINTANI TAKUJI, YOSHIOKA TOMOHISA, HASEGAWA Susumu, KAMIO EIJI, MATSUYAMA HIDETO
    化学工学会 中国四国支部;関西支部合同徳島大会, Dec. 2018, Japanese, 徳島大学, Domestic conference
    Oral presentation

  • ガス透過法およびミクロ孔充填相透過法を用いた多孔性セラミック膜の細孔構造評価Characterization of Porous Structures of Microporous Ceramic Membranes by Gas Permeation and Micropore Filling Phase Permeation Method
    Yuu Ogawa, Tomohisa Yoshioka, Keizo Nakagawa, Takuji Shintani, Eiji Kamio, Hideto Matsuyama
    第28回日本MRS年次大会, Dec. 2018, Japanese, 北九州国際会議場・西日本総合展示場, Domestic conference
    Poster presentation

  • TiO2-ZrO2-有機キレート配位子複合ガス分離膜の開発Development of TiO2-ZrO2-organic chelate ligand composite membranes for gas separation
    Tomohisa Yoshioka, Shoichi Hirai, Keizo Nakagawa, Takuji Shintani, Eiji Kamio, Hideto Matsuyama
    第28回日本MRS年次大会, Dec. 2018, Japanese, 北九州国際会議場・西日本総合展示場, Domestic conference
    Oral presentation

  • Fabrication of cross-linked graphene oxide membranes by using alkanolamine
    Shintaro Araya, Keizo Nakagawa, Tomohisa Yoshioka, Takuji Shintani, Eiji Kamio, Hideto Matsuyama
    第28回日本MRS年次大会, Dec. 2018, Japanese, 北九州国際会議場・西日本総合展示場, Domestic conference
    Poster presentation

  • 有機キレート配位子を鋳型に用いたTiO2-ZrO2複合NF膜の分離特性
    貞 佑樹, YOSHIOKA TOMOHISA, 中川 敬三, 新谷 卓司, 神尾 英治, 松山 秀人
    膜シンポジウム2018, Nov. 2018, Japanese, 日本膜学会, 神戸市, Domestic conference
    Poster presentation

  • 分子シミュレーションによるポリイミド膜構造の規則性が気体透過特性に及ぼす影響評価
    片山 基輔, YOSHIOKA TOMOHISA, 中川 敬三, 新谷 卓司, 藤原 寛, 神尾 英治, 松山 秀人
    膜シンポジウム2018, Nov. 2018, Japanese, 神戸市, Domestic conference
    Poster presentation

  • 非平衡分子動力学シミュレーションによるTiO2 ナノ細孔内液相透過現象のモデリング
    YOSHIOKA TOMOHISA, 鈴木悠太, 中川 敬三, 新谷 卓司, 松山 秀人
    膜シンポジウム2018, Nov. 2018, Japanese, 日本膜学会, 神戸市, Domestic conference
    Oral presentation

  • 電気透析排水中の2価陽イオンと2価陰イオンを高度に選択分離する新規ナノ濾過膜の開発と性能評価
    濵田 慎之介, 新谷 卓司, 赤松 憲樹, 中川 敬三, 長谷川 進, 松山 秀人, YOSHIOKA TOMOHISA
    膜シンポジウム2018, Nov. 2018, Japanese, 日本膜学会, 神戸市, Domestic conference
    Poster presentation

  • 中空シリカ担持Pt触媒を用いたシリカ系分離膜の作製とメチルシクロヘキサン脱水素反応の評価
    岩崎 太幹, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO, YOSHIOKA TOMOHISA
    膜シンポジウム2018, Nov. 2018, Japanese, 神戸, Domestic conference
    Poster presentation

  • 浸透圧補助型低圧逆浸透法における塩水濃縮に及ぼす各種操作条件の影響
    東郷 範弘, NAKAGAWA KEIZO, 高橋 智輝, SHINTANI TAKUJI, YOSHIOKA TOMOHISA, KAMIO EIJI, MATSUYAMA HIDETO
    膜シンポジウム2018, Nov. 2018, Japanese, 神戸, Domestic conference
    Poster presentation

  • ニオブ酸化物ナノシート積層型分離膜の作製―ナノシート調製法が膜性能に及ぼす影響―
    中川 敬三, 世良友宏, 國松美里, YOSHIOKA TOMOHISA, 新谷 卓司, 神尾 英治, 松山 秀人
    膜シンポジウム2018, Nov. 2018, Japanese, 日本膜学会, 神戸市, Domestic conference
    Oral presentation

  • ニオブ酸化物/酸化グラフェン複合ナノシート膜における積層構造と透水性の関係
    國松 美里, NAKAGAWA KEIZO, YOSHIOKA TOMOHISA, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    膜シンポジウム2018, Nov. 2018, Japanese, 神戸, Domestic conference
    Poster presentation

  • アルカノールアミンを利用した架橋型酸化グラフェン積層膜の作製
    荒屋 伸太朗, NAKAGAWA KEIZO, SHINTANI TAKUJI, YOSHIOKA TOMOHISA, KAMIO EIJI, MATSUYAMA HIDETO
    膜シンポジウム2018, Nov. 2018, Japanese, 神戸, Domestic conference
    Poster presentation

  • Fabrication of Silica-based Catalytic Membrane including Pt CatalystsEncapsulated in Hollow Silica Nanotubes
    Daiki Iwasaki, Keizo Nakagawa, Takuji Shintani, Eiji Kamio, Hideto Matsuyama, Tomohisa Yoshioka
    6th International Workshop on Process Intensification (IWPI 2018), Nov. 2018, English, National Taiwan University, International conference
    Oral presentation

  • Enhanced Membrane Filtration Performance of Stacked Niobate Nanosheet Membranes by The Addition of Graphene Oxide
    Nakagawa Keizo, Kunimatsu Misato, Araya Shintaro, Yoshioka Tomohisa, Shintani Takuji, Kamio Eiji, Matsuyama Hideto
    6th International Workshop on Process Intensification (IWPI 2018), Nov. 2018, English, National Taiwan University, International conference
    [Invited]
    Invited oral presentation

  • 有機溶剤分離のためのTiO2-ZrO2複合膜の細孔径制御と性能評価
    家迫 遼介, YOSHIOKA TOMOHISA, 中川 敬三, 新谷 卓司, 神尾 英治, 松山 秀人
    第17 回無機膜研究会, Oct. 2018, Japanese, 化学工学会分離プロセス部会膜工学分科会, 長野県駒ヶ根市, Domestic conference
    Poster presentation

  • 化学的に剥離されたMoS2ナノシートによる積層膜の作製
    釆尾 崇哉, 中川 敬三, YOSHIOKA TOMOHISA, 新谷 卓司, 神尾 英治, 松山 秀人
    第17 回無機膜研究会, Oct. 2018, Japanese, 化学工学会分離プロセス部会膜工学分科会, 長野県駒ヶ根市, Domestic conference
    Poster presentation

  • 「酸化チタンナノワイヤーおよびグラフェを利用した触媒膜の設計
    塩野 颯斗, 中川 敬三, 新谷 卓司, 神尾 英治, 松山秀人, YOSHIOKA TOMOHISA
    第17 回無機膜研究会, Oct. 2018, Japanese, 化学工学会分離プロセス部会膜工学分科会, 長野県駒ヶ根市, Domestic conference
    Poster presentation

  • TiO2-ZrO2-有機キレート複合材料の特性評価と気体分離膜への応用
    橘 高志, YOSHIOKA TOMOHISA, 中川 敬三, 新谷 司, 神尾 英治, 松山 秀人
    第17 回無機膜研究会, Oct. 2018, Japanese, 化学工学会分離プロセス部会膜工学分科会, 長野県駒ヶ根市, Domestic conference
    Poster presentation

  • 膜透過分子間相互作用を考慮した多孔性セラミック膜の細孔構造評価
    小川 祐生, YOSHIOKA TOMOHISA, 中川 敬三, 新谷 卓司, 神尾 英治, 松山 秀人
    化学工学会第50回秋季大会, Sep. 2018, Japanese, 化学工学会, 鹿児島市, Domestic conference
    Oral presentation

  • 中空糸膜モジュールを用いた浸透圧補助低圧逆浸透法による塩水濃縮と透水挙動解析
    東郷 範弘, 中川 敬三, 高橋 智輝, 新谷 卓司, YOSHIOKA TOMOHISA, 神尾 英治, 松山 秀人
    化学工学会第50回秋季大会, Sep. 2018, Japanese, 化学工学会, 鹿児島市, Domestic conference
    Oral presentation

  • 水分子共存下におけるシリカナノ粒子の高分子膜表面への付着挙動の分子動力学シミュレーション
    岡田 恵丞, YOSHIOKA TOMOHISA, 中川 敬三, 新谷 卓司, 松山 秀人, 藤村 侑, 川勝 孝博
    化学工学会第50回秋季大会, Sep. 2018, Japanese, 化学工学会, 鹿児島市, Domestic conference
    Oral presentation

  • ニオブ酸化物ナノシート積層膜のナノろ過特性に及ぼす酸化グラフェン複合化の効果
    國松 美里, 中川 敬三, YOSHIOKA TOMOHISA, 新谷 卓司, 神尾 英治, 松山 秀人
    化学工学会第50回秋季大会, Sep. 2018, Japanese, 化学工学会, 鹿児島市, Domestic conference
    Oral presentation

  • Pt内包シリカナノチューブ触媒を用いたメチルシクロヘキサン脱水素反応および触媒膜の作製
    岩崎 太幹, 中川 敬三, 新谷 卓司, 神尾 英治, 松山 秀人, YOSHIOKA TOMOHISA
    化学工学会第50回秋季大会, Sep. 2018, Japanese, 化学工学会, 鹿児島市, Domestic conference
    Oral presentation

  • 2D Metal Oxide Nanosheets Synthesized by A Bottom-up Approach: Application to Catalyst and Membrane
    Nakagawa Keizo
    Bilateral Kobe-Kiel Workshop, Sep. 2018, English, Kobe University, International conference
    Nominated symposium

  • 水処理膜への応用を目指した二次元無機ナノシート積層膜
    NAKAGAWA Keizo
    新技術説明会, Aug. 2018, Japanese, JST, Domestic conference
    Oral presentation

  • 水処理膜への応用を目指した二次元無機ナノシート積層膜
    Nakagawa Keizo
    JST新技術説明会, Aug. 2018, Japanese, JST東京本部別館1Fホール, Domestic conference
    Public discourse

  • Molecular dynamics simulation study of polyamide membrane structures and RO/FO water permeation properties
    Yoshioka Tomohisa, Keisuke Kotaka, Keizo Nakagawa, Shintani Takuji, Kwakatsu Takahiro, Fujimura Yu, Wu Hao-Chen, Matsuyama Hideto
    The 11th Conference of Aseanian Membrane Society (AMS11), Jul. 2018, English, The Rydges Hotel, Brisbane Southbank, Australia, International conference
    Oral presentation

  • Fabrication of 2D Niobium Oxide/Graphene Oxide Nanosheet Composite Membranes for Nanofiltration
    Keizo NAKAGAWA, Misato KUNIMATSU, Daisuke SAEKI, Tomohisa YOSHIOKA, Takuji SHINTANI, Eiji KAMIO, Hideto MATSUYAMA
    The 11th Conference of Aseanian Membrane Society (AMS11), Jul. 2018, English, Aseanian Membrane Society, Brisbane (Australia), International conference
    Oral presentation

  • Development of polyamide thin-film composite membrane using novel porous support for organic solvent treatment
    Takuji SHINTANI, Yuki NAKAGAWA, Tomoki TAKAHASHI, Keizo NAKAGAWA, Hideto MATSUYAMA, Tomohisa YOSHIOKA
    The 11th Conference of Aseanian Membrane Society (AMS11), Jul. 2018, English, Aseanian Membrane Society, Brisbane (Australia), International conference
    Poster presentation

  • 酸化グラフェンの複合による金属酸化物ナノシート積層膜の膜性能向上
    國松 美里, NAKAGAWA Keizo, YOSHIOKA Tomohisa, SHINTANI Takuji, KAMIO Eiji, MATSUYAMA Hideto
    第7回JACI/GSCシンポジウム, Jun. 2018, Japanese, 新化学技術推進協会, 神戸市, Domestic conference
    Poster presentation

  • 気体透過法による多孔性無機膜のサブナノ細孔径分布評価と気体透過選択性の予測
    小川 祐生, YOSHIOKA TOMOHISA, NAKAGAWA Keizo, SHINTANI Takuji, KAMIO Eiji, MATSUYAMA Hideto
    第7回JACI/GSCシンポジウム, Jun. 2018, Japanese, 新化学技術推進協会, 神戸市, Domestic conference
    Poster presentation

  • Simulation and modeling of water permeation in TiO2 nanoporous membranes using non-equilibrium molecular dynamics
    Yoshioka Tomohisa, Suzuki Yuta, Keizo Nakagawa, Shintani Takuji, Kamio Eiji, Matsuyama Hideto, Tsuru Toshinori
    15th International Conference on Inorganic Membranes (ICIM-15)15th International Conference on Inorganic Membranes, Jun. 2018, English, The Westin Bellevue Dresden, Germany, International conference
    Oral presentation

  • 2D niobium oxide nanosheet membranes for water treatment: effects of nanosheet preparation methods on their membrane performances
    NAKAGAWA Keizo, SERA Tomohiro, KUNIMATSU Misato, Daisuke SAEKI, YOSHIOKA Tomohisa, SHINTANI Takuji, KAMIO Eiji, MATSUYAMA Hideto
    15th International Conference on Inorganic Membranes (ICIM2018), Jun. 2018, English, International conference
    Oral presentation

  • 有機キレート配位子を鋳型に用いた高透水性TiO2-ZrO2複合NF膜の分離特性
    貞 佑樹, YOSHIOKA TOMOHISA, 中川 敬三, 新谷 卓司, 神尾 英治, 松山 秀人
    化学工学会第50回秋季大会, May 2018, Japanese, 化学工学会, 鹿児島市, Domestic conference
    Oral presentation

  • 気体透過法による多孔性無機膜のin-situサブナノ細孔径分布評価法の開発
    小川 祐生, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    日本膜学会第40年会, May 2018, Japanese, 東京, Domestic conference
    Poster presentation

  • 界面活性剤を用いたボトムアップ型金属酸化物ナノシート触媒の合成
    Nakagawa Keizo
    石油学会第61回年会, May 2018, Japanese, タワーホール船堀, Domestic conference
    [Invited]
    Invited oral presentation

  • ニオブ酸化物ナノシート積層型分離膜の酸化グラフェン導入によるナノろ過特性の向上
    國松 美里, NAKAGAWA KEIZO, SAEKI DAISUKE, YOSHIOKA TOMOHISA, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    日本膜学会第40年会, May 2018, Japanese, 東京, Domestic conference
    Poster presentation

  • キュービック型メソポーラスシリカ膜で被覆されたPt触媒の触媒活性と構造耐久性
    NAKAGAWA Keizo, 吉田 晶, 西田 優, 加藤 雅裕, YOSHIOKA Tomohisa, MATSUYAMA Hideto, 杉山 茂
    日本膜学会第40年会, May 2018, Japanese, 日本膜学会, 東京都, Domestic conference
    Oral presentation

  • Relating osmotic performance and pressure resistance of thin-film composite membranes to the properties of reinforcing non-woven fabrics
    孫 雨辰, Li-feng Fang, CHENG LIANG, Takuji Shintani, Keizo Nakagawa, Hideto Matsuyama
    第7回JACI/GSCシンポジウム, May 2018, English, 神戸, Domestic conference
    Poster presentation

  • Pt内包シリカナノチューブを利用した触媒膜の作製
    岩﨑 太幹, NAKAGAWA Keizo, SHINTANI Takuji, KAMIO Eiji, MATSUYAMA Hideto, YOSHIOKA Tomohisa
    分離技術会年会2018, May 2018, Japanese, 分離技術会, 千葉県習志野市, Domestic conference
    Poster presentation

  • 水処理膜への応用を目指した二次元金属酸化物ナノシート積層膜の開発
    Nakagawa Keizo
    先端膜工学センター成果発表会, Apr. 2018, Japanese, 神戸大学瀧川記念学術交流会館, Domestic conference
    Nominated symposium

  • ⾦属酸化物ナノシート/酸化グラフェン積層膜の作製と膜性能に及ぼす複合⽐の影響
    國松 美里, NAKAGAWA KEIZO, 世良 友宏, SAEKI DAISUKE, YOSHIOKA TOMOHISA, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    第20回化学工学会学生発表会, Mar. 2018, Japanese, 広島, Domestic conference
    Oral presentation

  • 有機溶媒耐性を有するポリアミド系複合薄膜の開発
    中川 湧貴, SHINTANI TAKUJI, TAKAHASHI TOMOKI, HASEGAWA Susumu, NAKAGAWA KEIZO, MATSUYAMA HIDETO, YOSHIOKA TOMOHISA
    化学工学会第83回年会, Mar. 2018, Japanese, 大阪, Domestic conference
    Poster presentation

  • 分子動力学法を用いたイオン液体水溶液の特性評価と正浸透膜透過シミュレーション
    佐田久 紗暉, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, 三野 泰志, TAKAHASHI TOMOKI, KAMIO EIJI, MATSUYAMA HIDETO
    化学工学会第83回年会, Mar. 2018, Japanese, 大阪, Domestic conference
    Poster presentation

  • 分子動力学法による水中の高分子膜表面近傍におけるシリカナノ粒子の挙動解析
    岡田 恵丞, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, MATSUYAMA HIDETO
    化学工学会第83回年会, Mar. 2018, Japanese, 大阪, Domestic conference
    Poster presentation

  • 分子シミュレーションによる新規ポリイミド膜の構造設計と気体透過特性評価
    片山 基輔, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, 藤原 寛, KAMIO EIJI, MATSUYAMA HIDETO
    化学工学会第83回年会, Mar. 2018, Japanese, 大阪, Domestic conference
    Poster presentation

  • 分子シミュレーションによるポリアミド膜設計とFO/RO透水性能評価
    古高 啓介, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, 川勝 孝博, 藤村 侑, Wu Hao-Chen, SAEKI DAISUKE, MATSUYAMA HIDETO
    化学工学会第83回年会, Mar. 2018, Japanese, 大阪, Domestic conference
    Poster presentation

  • 剥離法により調製した金属酸化物ナノシートを利用した積層薄膜の作製と水処理膜への応用
    世良 友宏, NAKAGAWA KEIZO, SAEKI DAISUKE, YOSHIOKA TOMOHISA, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    化学工学会第83回年会, Mar. 2018, Japanese, 大阪, Domestic conference
    Poster presentation

  • 電気透析排水中の2価陽イオンと2価陰イオンを分離する新規ナノ濾過膜の開発
    濵田 慎之介, SHINTANI TAKUJI, 赤松 憲樹, NAKAGAWA KEIZO, HASEGAWA Susumu, MATSUYAMA HIDETO, YOSHIOKA TOMOHISA
    化学工学会第83回年会, Mar. 2018, Japanese, 大阪, Domestic conference
    Poster presentation

  • 電気透析排水から2価陽イオンと2価陰イオンを選択分離する新規ナノ濾過膜の開発
    濵田 慎之介, SHINTANI TAKUJI, 赤松 憲樹, NAKAGAWA KEIZO, TAKAHASHI TOMOKI, HASEGAWA Susumu, MATSUYAMA HIDETO, YOSHIOKA TOMOHISA
    日本海水学会若手会第9回学生研究発表会, Mar. 2018, Japanese, 東京, Domestic conference
    Oral presentation

  • 中空糸膜を利用した正浸透法および逆浸透法における膜ファウリング特性の比較検討
    岡本 将尚, NAKAGAWA KEIZO, TAKAHASHI TOMOKI, SHINTANI TAKUJI, YOSHIOKA TOMOHISA, HASEGAWA Susumu, KAMIO EIJI, MATSUYAMA HIDETO
    化学工学会第83回年会, Mar. 2018, Japanese, 大阪, Domestic conference
    Poster presentation

  • 正浸透膜法による食品工程廃水濃縮プロセスに関する研究
    瀧上 直哉, SHINTANI TAKUJI, TAKAHASHI TOMOKI, HASEGAWA Susumu, NAKAGAWA KEIZO, MATSUYAMA HIDETO, YOSHIOKA TOMOHISA
    化学工学会第83回年会, Mar. 2018, Japanese, 大阪, Domestic conference
    Poster presentation

  • 正浸透膜の選択透過性の向上と糖液濃縮およびバイオエタノール生産に及ぼす効果
    張 一涵, Keizo Nakagawa, Kengo Sasaki, 渋谷 真史, Tomoki Takahashi, Takuji Shintani, Tomohisa Yoshioka, 長谷川 進, Michimasa Kishimoto, Eiji Kamio, Akihiko Kondo, Hideto Matsuyama
    化学工学会第83年会, Mar. 2018, Japanese, 化学工学会, 吹田市, Domestic conference
    Poster presentation

  • 正浸透膜の選択透過性の向上と糖液濃縮およびバイオエタノール生産に及ぼす効果
    張 一涵, NAKAGAWA KEIZO, SASAKI KENGO, 渋谷 真史, TAKAHASHI TOMOKI, SHINTANI TAKUJI, YOSHIOKA TOMOHISA, HASEGAWA Susumu, KISHIMOTO MICHIMASA, KAMIO EIJI, KONDO AKIHIKO, MATSUYAMA HIDETO
    化学工学会第83回年会, Mar. 2018, Japanese, 大阪, Domestic conference
    Poster presentation

  • 気体透過法による多孔膜のサブナノ細孔径分布評価
    小川 祐生, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    第20回化学工学会学生発表会, Mar. 2018, Japanese, 広島, Domestic conference
    Oral presentation

  • ポリケトン膜のアミン修飾による耐圧性向上の要因と正浸透膜への応用
    呉 蒋霊川, NAKAGAWA KEIZO, FANG LIFENG, TAKAHASHI TOMOKI, SHINTANI TAKUJI, YOSHIOKA TOMOHISA, HASEGAWA Susumu, KAMIO EIJI, MATSUYAMA HIDETO
    化学工学会第83回年会, Mar. 2018, Japanese, 大阪, Domestic conference
    Poster presentation

  • キレート配位子を鋳型とするナノ多孔性TiO2-ZrO2複合膜の作製と性能評価
    貞 佑樹, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    化学工学会第83回年会, Mar. 2018, Japanese, 大阪, Domestic conference
    Poster presentation

  • TiO2-ZrO2-有機キレート配位子複合ガス分離膜の作製とCO2透過特性の評価
    平井 翔一, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    化学工学会第83回年会, Mar. 2018, Japanese, 大阪, Domestic conference
    Poster presentation

  • Pt内包中空シリカナノチューブ触媒の調製と脱水素反応用触媒膜への適用
    岩﨑 太幹, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO, YOSHIOKA TOMOHISA
    化学工学会第83回年会, Mar. 2018, Japanese, 大阪, Domestic conference
    Poster presentation

  • 2D金属酸化物ナノシート材料を利用した積層膜の作製と膜分離性能
    NAKAGAWA KEIZO, 世良 友宏, 國松 美里, SAEKI DAISUKE, YOSHIOKA TOMOHISA, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    化学工学会金沢大会2017, Dec. 2017, Japanese, 石川, Domestic conference
    Oral presentation

  • 分子動力学法を用いたイオン液体水溶液のLCST型相挙動を決定する因子の解明
    佐田久 紗暉, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, 三野 泰志, TAKAHASHI TOMOKI, KAMIO EIJI, MATSUYAMA HIDETO
    第8回イオン液体討論会, Nov. 2017, Japanese, 東京, Domestic conference
    Poster presentation

  • 二次元金属酸化物ナノシート積層膜の開発–水中における構造安定性と膜分離性能–
    NAKAGAWA KEIZO, 山下洋令, 世良友宏, SAEKI DAISUKE, YOSHIOKA TOMOHISA, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    膜シンポジウム2017, Nov. 2017, English, 富山, Domestic conference
    Poster presentation

  • 二次元ナノシート材料を用いた積層型分離膜の開発
    Nakagawa Keizo
    先端膜工学研究拠点第3回ワークショップ, Nov. 2017, Japanese, 神戸大学, Domestic conference
    Nominated symposium

  • 浸透圧補助低圧逆浸透法を用いた高濃縮膜プロセスの検討
    東郷範弘, NAKAGAWA KEIZO, TAKAHASHI TOMOKI, SHINTANI TAKUJI, YOSHIOKA TOMOHISA, KAMIO EIJI, KISHIMOTO MICHIMASA, MATSUYAMA HIDETO
    膜シンポジウム2017, Nov. 2017, English, 富山, Domestic conference
    Poster presentation

  • 金属酸化物ナノシート積層型分離膜の開発とナノろ過特性
    Nakagawa Keizo
    反応分離シンポジウム2017, Nov. 2017, Japanese, 神戸大学, Domestic conference
    [Invited]
    Nominated symposium

  • TiO2–ZrO2– 有機キレート複合材料を用いたCO2 分離膜の作製と特性評価
    平井翔一, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    膜シンポジウム2017, Nov. 2017, English, 富山, Domestic conference
    Poster presentation

  • TEMPERATURE-RESPONS IVE PROPERTY OF DRAW SOLUTIONS FOR FORWARD OSMOS IS DESALINATION: A MOLECULAR SIMULATION STUDY
    Saki SADAHISA, Tomohisa YOSHIOKA, Keizo NAKAGAWA, Takuji SHINTANI, Yasushi MINO, Eiji KAMIO, Hideto MATSUYAMA
    The 11th International Conference onSeparation Science and Technology(ICSST17), Nov. 2017, English, 韓国(釜山), International conference
    Poster presentation

  • NON-EQUILIBRIUM MOLECULAR DYNAM ICS SIMULATION OF WATER TRANSPORT THROUGH TiO2 NANOPOROUS MEMBRANES
    Yuta SUZUKI, Tomohisa YOSHIOKA, Keizo NAKAGAWA, Takuji SHINTANI, Yasushi MINO, Eiji KAMIO, Hideto MATSUYAMA
    The 11th International Conference onSeparation Science and Technology(ICSST17), Nov. 2017, English, 韓国(釜山), International conference
    Poster presentation

  • MOLECULAR SIMULATION OF CYCLIC PEPTIDE NANOTUBES FOR NOVEL WATER CHANNEL
    Tomohisa YOSHIOKA, Hao-Chen WU, Keizo NAKAGAWA, Takuji SHINTANI, Hiroki NAGASAWA, Masakoto KANEZASHI, Toshinori TSURU, Daisuke SAEKI, Hideto MATSUYAMA
    The 11th International Conference onSeparation Science and Technology(ICSST17), Nov. 2017, English, 韓国(釜山), International conference
    Poster presentation

  • FABRICAT ION OF HIGHLY STABLE STACKED NIOBATE NANOSHEET MEMBRANES FOR NANOFILTRAT ION
    Keizo NAKAGAWA, Tomohiro SERA, Hiroharu YAMASHITA, Daisuke SAEKI, Tomohisa YOSHIOKA, Takuji SHINTANI, Eiji KAMIO, Hideto MATSUYAMA
    The 11th International Conference onSeparation Science and Technology(ICSST17), Nov. 2017, English, 韓国(釜山), International conference
    Oral presentation

  • EFFECT OF NANOSHEET PREPARATION METHODS ON THE MEMBRANE PERFORMANCE OF STACKED NIOBATE NANOSHEET MEMBRANES
    Tomohiro SERA, Keizo NAKAGAWA, Hiroharu YAMASHITA, Misato KUNIMATSU, Daisuke SAEKI, Takuji SHINTANI, Tomohisa YOSHIOKA, Eiji KAMIO, Hideto MATSUYAMA
    The 11th International Conference onSeparation Science and Technology(ICSST17), Nov. 2017, English, 韓国(釜山), International conference
    Poster presentation

  • CHARACTERIZATION OF NANOPOROUS TITANIA-ZIRCONIA COMPOSITE MEMBRANES PREPARED BY USING ORGANIC CHELATING LIGANDS
    Yuki SADA, Tomohisa YOSHIOKA, Keizo NAKAGAWA, Takuji SHINTANI, Eiji KAMIO, Hideto MATSUYAMA
    The 11th International Conference onSeparation Science and Technology(ICSST17), Nov. 2017, English, 韓国(釜山), International conference
    Poster presentation

  • 気体透過法による多孔膜のサブナノ細孔径分布評価
    小川 祐生, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    第16 回無機膜研究会, Oct. 2017, Japanese, 静岡, Domestic conference
    Poster presentation

  • メンブレンリアクターへの利用を目指した新規シリカ被覆金属触媒の調製
    岩崎 太幹, NAKAGAWA KEIZO, YOSHIOKA TOMOHISA, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    第16 回無機膜研究会, Oct. 2017, Japanese, 静岡, Domestic conference
    Poster presentation

  • 2D ナノシート材料を利用した積層型無機膜の作製と膜性能評価
    國松 美里, NAKAGAWA KEIZO, 世良 友宏, 山下 洋令, SAEKI DAISUKE, YOSHIOKA TOMOHISA, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    第16 回無機膜研究会, Oct. 2017, Japanese, 静岡, Domestic conference
    Poster presentation

  • 有機溶媒耐性を有する高分子系複合薄膜の開発
    中川 湧貴, SHINTANI TAKUJI, TAKAHASHI TOMOKI, SAEKI DAISUKE, NAKAGAWA KEIZO, MATSUYAMA HIDETO, YOSHIOKA TOMOHISA
    化学工学会第49回秋季大会, Sep. 2017, Japanese, 名古屋, Domestic conference
    Oral presentation

  • 正浸透膜法による糖液濃縮およびバイオエタノール生産に及ぼすポリアミド層の分離性能の影響
    張 一涵, Keizo Nakagawa, Kengo Sasaki, 渋谷 真史, Tomoki Takahashi, Takuji Shintani, Tomohisa Yoshioka, Michimasa Kishimoto, Eiji Kamio, Akihiko Kondo, Hideto Matsuyama
    化学工学会第49回秋季大会, Sep. 2017, Japanese, 化学工学会, 名古屋市, Domestic conference
    Poster presentation

  • ニオブ酸ナノシート積層型分離膜のシートサイズが及ぼす膜性能への影響
    世良 友宏, NAKAGAWA KEIZO, SAEKI DAISUKE, YOSHIOKA TOMOHISA, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    化学工学会第49回秋季大会, Sep. 2017, Japanese, 名古屋, Domestic conference
    Poster presentation

  • Relating osmotic performance and pressure resistance of thin-film composite membranes to the properties of reinforcing non-woven fabrics
    Yuchen Sun, Lifeng Fang, CHENG LIANG, Shintani Takuji, Keizo Nakagawa, Hideto Matsuyama
    化学工学会第49回秋季大会, Sep. 2017, English, 名古屋, Domestic conference
    Poster presentation

  • Preparation of Amphotericin B-Ergosterol structures and molecular simulation of water adsorption and diffusion
    Hao-Chen Wu, Tomohisa YOSHIOKA, Keizo NAKAGAWA, Takuji SHINTANI, Toshinori TSURU, Daisuke SAEKI, Abdul Rajjak, Hideto MATSUYAMA
    2017 International Congress on Membranes and Membrane Processes (ICOM2017), Jul. 2017, English, USA(San Francisco), International conference
    Poster presentation

  • Preparation and nanofiltration performance of niobate nanosheet membranes
    Keizo NAKAGAWA, Hiroharu YAMASHITA, Daisuke SAEKI, Tomohisa Yoshioka, Takuji Shintani, Eiji Kamio, Hideto MATSUYAMA
    2017 International Congress on Membranes and Membrane Processes (ICOM2017), Jul. 2017, English, USA(San Francisco), International conference
    Oral presentation

  • Effects of separation performance of forward osmosis membranes on sugar concentration for bio-ethanol production
    Yihan ZHANG, Keizo NAKAGAWA, Masafumi SHIBUYA, Kengo SASAKI, Tomoki TAKAHASHI, Takuji SHINTANI, Tomohisa YOSHIOKA, Michimasa KISHIMOTO, Eiji KAMIO, Akihiko KONDO, Hideto MATSUYAMA
    2017 International Congress on Membranes and Membrane Processes (ICOM2017), Jul. 2017, English, USA(San Francisco), International conference
    Poster presentation

  • Characterization of porous titania-zirconia composite membrane materials prepared by using organic chelating ligands
    Tomohisa YOSHIOKA, Yuki SADA, Keizo NAKAGAWA, Takuji SHINTANI, Eiji KAMIO, Hideto MATSUYAMA
    2017 International Congress on Membranes and Membrane Processes (ICOM2017), Jul. 2017, English, USA(San Francisco), International conference
    Poster presentation

  • 有機溶媒耐性を有するポリアミド活性層複合膜の開発
    中川 湧貴, SHINTANI TAKUJI, NAKAGAWA KEIZO, YOSHIOKA TOMOHISA, TAKAHASHI TOMOKI, KAMIO EIJI, MATSUYAMA HIDETO
    日本膜学会第39年会, May 2017, Japanese, 東京, Domestic conference
    Poster presentation

  • 有機キレートをテンプレートとする多孔性TiO2-ZrO2複合膜の特性評価
    貞 佑樹, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    日本膜学会第39年会, May 2017, Japanese, 東京, Domestic conference
    Poster presentation

  • 正浸透膜の耐圧性能に及ぼす多孔性支持膜へのアミン修飾の影響
    呉 蒋霊川, NAKAGAWA KEIZO, TAKAHASHI TOMOKI, SHINTANI TAKUJI, YOSHIOKA TOMOHISA, KAMIO EIJI, MATSUYAMA HIDETO
    日本膜学会第39年会, May 2017, Japanese, 東京, Domestic conference
    Poster presentation

  • Recent developments in two-dimensional nanosheet membranes for water treatment
    NAKAGAWA KEIZO
    日本膜学会第39年会, May 2017, Japanese, 早稲田大学西早稲田キャンパス, 膜による水処理技術は,蒸留や電気分解に比べてエネルギー消費が低く,高い分離選択性や連続運転を可能とする重要な分離プロセスである。耐熱性や耐薬品性,機械的強度に優れた無機膜は,水処理への応用も幅広く展開されている。例えば,近年では卓越した合成技術を備えたシリカ系やアルミナ,チタニア膜,また精密な細孔構造を有するゼオライトやカーボンナノチューブに代表されるナノ構造材料を用いた膜において,逆浸透法による脱塩や浸透気化法による有機水溶液の脱水など様々な研究が精力的に進められている。ここでは,新たな無機膜として注目されている二次元ナノシート膜について紹介する。, Domestic conference
    [Invited]
    Invited oral presentation

  • 金属酸化物ナノシート積層膜の形成と膜性能に及ぼす各種ナノシート合成法の影響
    世良 友宏, NAKAGAWA KEIZO, 山下 洋令, SAEKI DAISUKE, SHINTANI TAKUJI, YOSHIOKA TOMOHISA, KAMIO EIJI, MATSUYAMA HIDETO
    日本膜学会第39年会, May 2017, Japanese, 東京, Domestic conference
    Poster presentation

  • TiO2ナノ細孔内水透過シミュレーションと透過モデルによる解析
    鈴木 悠太, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, 三野 泰志, KAMIO EIJI, MATSUYAMA HIDETO
    分離技術会年会2017, May 2017, Japanese, 神奈川, Domestic conference
    Oral presentation

  • TiO2-ZrO2複合膜材料のナノ細孔構造に及ぼす有機キレート配位子の影響
    貞 佑樹, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    分離技術会年会2017, May 2017, Japanese, 神奈川, Domestic conference
    Oral presentation

  • 有機キレートを用いた多孔性TiO2-ZrO2複合膜の作製と構造評価
    SADA YUKI, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA HIDETO
    第19回化学工学会学生発表会 (豊中大会), Mar. 2017, Japanese, 大阪, Domestic conference
    Oral presentation

  • 分子動力学法を用いたTiO2ナノ細孔内水透過機構の検討
    SUZUKI YUTA, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, MINO YASUSHI, KAMIO EIJI, MATSUYAMA Hideto
    化学工学会第82年会, Mar. 2017, Japanese, 東京, Domestic conference
    Poster presentation

  • 分子シミュレーションによる温度応答性イオン液体水溶液の相転移挙動解析
    SADAHISA SAKI, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, MINO YASUSHI, TAKAHASHI TOMOKI, KAMIO EIJI, MATSUYAMA Hideto
    化学工学会第82年会, Mar. 2017, Japanese, 東京, Domestic conference
    Poster presentation

  • 二次元チャネル構造を有する金属酸化物ナノシート積層膜の膜性能評価
    NAKAGAWA KEIZO, 山下 洋令, SAEKI DAISUKE, YOSHIOKA TOMOHISA, SHINTANI TAKUJI, 加藤 雅裕, 杉山 茂, Eiji KAMIO, MATSUYAMA Hideto
    化学工学会第82年会, Mar. 2017, English, 東京, Domestic conference
    Oral presentation

  • 中空糸膜モジュールのモジュール形状が浸透圧発電プロセスに与える影響
    田中 裕大, YASUKAWA Masahiro, 合田 昌平, 渋谷 真史, TAKAHASHI Tomoki, KISHIMOTO MICHIMASA, NAKAGAWA KEIZO, SHINTANI TAKUJI, 比嘉 充, MATSUYAMA Hideto
    化学工学会第82年会, Mar. 2017, Japanese, 東京, Domestic conference
    Poster presentation

  • 多段式低圧逆浸透法を利用した塩水濃縮プロセスの検討
    東郷 範弘, 田中 裕大, NAKAGAWA KEIZO, TAKAHASHI Tomoki, Eiji KAMIO, SHINTANI TAKUJI, KISHIMOTO MICHIMASA, YOSHIOKA TOMOHISA, MATSUYAMA Hideto
    第19回化学工学会学生発表会(豊中大会), Mar. 2017, Japanese, 大阪, Domestic conference
    Oral presentation

  • 浸透圧補助低圧逆浸透法による海水高濃縮技術に関する基礎的検討
    東郷 範弘, 田中 裕大, NAKAGAWA KEIZO, TAKAHASHI Tomoki, Eiji KAMIO, SHINTANI TAKUJI, KISHIMOTO MICHIMASA, YOSHIOKA TOMOHISA, MATSUYAMA Hideto
    日本海水学会若手会 第8回学生研究発表会, Mar. 2017, Japanese, 山口, Domestic conference
    Oral presentation

  • 吸引ろ過法により作製されたニオブ酸ナノシート積層膜の膜性能に及 ぼす作製条件の影響
    山下 洋令, NAKAGAWA KEIZO, SAEKI DAISUKE, YOSHIOKA TOMOHISA, SHINTANI TAKUJI, 加藤 雅裕, 杉山 茂, Eiji KAMIO, MATSUYAMA Hideto
    化学工学会第82年会, Mar. 2017, English, 東京, Domestic conference
    Poster presentation

  • ポリアミド活性層の表面改質が及ぼす正浸透膜法による糖液濃縮およ びバイオエタノール生産への影響
    張 一涵, NAKAGAWA KEIZO, 渋谷 真史, TAKAHASHI Tomoki, SHINTANI TAKUJI, YOSHIOKA TOMOHISA, KISHIMOTO MICHIMASA, Eiji KAMIO, MATSUYAMA Hideto
    化学工学会第82年会, Mar. 2017, Japanese, 東京, Domestic conference
    Poster presentation

  • TiO2-ZrO2-有機キレート複合材料の特性評価とCO2分離膜への応用
    HIRAI SHOICHI, YOSHIOKA TOMOHISA, NAKAGAWA KEIZO, SHINTANI TAKUJI, KAMIO EIJI, MATSUYAMA Hideto
    化学工学会第82年会, Mar. 2017, Japanese, 東京, Domestic conference
    Poster presentation

  • 糖液濃縮用分離膜の表面改質による糖類と発酵阻害物質の選択透過性への影響
    張 一涵, NAKAGAWA KEIZO, 渋谷 真史, TAKAHASHI Tomoki, Eiji KAMIO, SHINTANI TAKUJI, KISHIMOTO MICHIMASA, YOSHIOKA TOMOHISA, MATSUYAMA Hideto
    膜シンポジウム2016, Dec. 2016, Japanese, 大阪, Domestic conference
    Poster presentation

  • 吸引ろ過法を用いた異なる膜厚さのナノシート積層膜の作製と膜分離性能
    山下 洋令, NAKAGAWA KEIZO, SAEKI DAISUKE, Eiji KAMIO, SHINTANI TAKUJI, YOSHIOKA TOMOHISA, MATSUYAMA Hideto, 加藤 雅裕, 杉山 茂
    膜シンポジウム2016, Dec. 2016, Japanese, 大阪, Domestic conference
    Poster presentation

  • 吸引ろ過法により作製されたニオブ酸ナノシート積層膜の膜性能評価
    山下 洋令, NAKAGAWA KEIZO, SAEKI DAISUKE, Eiji KAMIO, SHINTANI TAKUJI, YOSHIOKA TOMOHISA, MATSUYAMA Hideto, 加藤 雅裕, 杉山 茂
    第15回無機膜研究会, Nov. 2016, Japanese, 愛知, Domestic conference
    Poster presentation

  • 吸引ろ過法による二次元ナノシート積層膜の作製と膜分離特性
    山下 洋令, SAEKI DAISUKE, NAKAGAWA KEIZO, SHINTANI TAKUJI, YOSHIOKA TOMOHISA, 加藤 雅裕, 杉山 茂, MATSUYAMA Hideto
    化学工学会第48回秋季大会, Sep. 2016, Japanese, 徳島, Domestic conference
    Oral presentation

  • 吸引ろ過法による二次元ナノシート積層膜の作製と膜分離性能
    山下 洋令, SAEKI DAISUKE, NAKAGAWA KEIZO, SHINTANI TAKUJI, YOSHIOKA TOMOHISA, 加藤 雅裕, 杉山 茂, MATSUYAMA Hideto
    化学工学会第48回秋季大会, Sep. 2016, Japanese, 徳島, Domestic conference
    Oral presentation

  • Tailoring acidities of niobium oxides for catalytic conversion of sugars to 5-Hydroxymethylfurfural
    KREISSL Hannah Theresa, NAKAGAWA KEIZO, PENG Yung-Kang, TSANG Shik Chi Edman
    The 16th International Congress on Catalysis (ICC 16), Jul. 2016, English, Beijing, International conference
    Poster presentation

  • Sintering Resistance and Cyclohexane Dehydrogenation of Pt Catalyst Covered with Cubic Mesoporous Silica Layers
    NAKAGAWA KEIZO, NISHIDA Suguru, YOSHIDA Akira, KATOH Masahiro, SUGIYAMA Shigeru, DUBOIS Vincent, HERMANS Sophie
    The 10th Conference of Aseanian Membrane Society (AMS10), Jul. 2016, English, Nara Kasugano International Forum, Nara, Japan, International conference
    Poster presentation

  • Single Layer Niobate Nanosheets Prepared by A Bottom-Up Approach: Photocatalytic Hydrogen Evolution from Water/Methanol Solution
    NAKAGAWA KEIZO, KATOH Masahiro, SUGIYAMA Shigeru, TSANG Shik Chi Edman
    The 10th Conference of Aseanian Membrane Society (AMS10), Jul. 2016, English, Nara Kasugano International Forum, Nara, Japan, International conference
    Poster presentation

  • Preparation of Titania Thin Film for Dye-Sensitized Solar Cells using Titanium Oxide Nanosheets
    HIRAOKA Saki, MOTOKI Naoya, HONDA Yuta, NAKAGAWA KEIZO, KATOH Masahiro, SUGIYAMA Shigeru, ADACHI Motonari, MATSUO Hiroshi, UCHIDA Fumio
    The 10th Conference of Aseanian Membrane Society (AMS10), Jul. 2016, English, Nara Kasugano International Forum, Nara, Japan, International conference
    Poster presentation

  • Layered Titanate Nanosheets with and without Lamellar Mesostructure Formed by Surfactant Self-Assembly
    NAKAGAWA KEIZO, SUGIYAMA Shigeru, ADACHI Motonari
    The 10th Conference of Aseanian Membrane Society (AMS10), Jul. 2016, English, Nara Kasugano International Forum, Nara, Japan, International conference
    Poster presentation

  • Formation and Structural Analysis of Niobate Nanosheets with Different Sheet Thickness
    NAKAGAWA KEIZO, Hiroharu YAMASHITA, KATOH Masahiro, SUGIYAMA Shigeru, SAEKI Daisuke, MATSUYAMA Hideto
    The 10th Conference of Aseanian Membrane Society (AMS10), Jul. 2016, English, Nara Kasugano International Forum, Nara, Japan, International conference
    Poster presentation

■ Affiliated Academic Society
  • THE SOCIETY OF CHEMICAL ENGINEERS, JAPAN

  • THE MEMBRANE SOCIETY OF JAPAN

  • THE JAPAN PETROLEUM INSTITUTE

  • CATALYSIS SOCIETY OF JAPAN

■ Research Themes
  • Development of ultrathin laminar nanosheet membranes with controlled 2-D channel structure for organic solvent filtration
    中川 敬三
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2022 - 31 Mar. 2025

  • 革新的水処理および創エネルギー技術の構築を目指した次世代型正浸透膜法の体系化
    松山 秀人, 松方 正彦, 比嘉 充, 小野 努, 吉岡 朋久, 中川 敬三, 神尾 英治, 佐伯 大輔, 松岡 淳
    日本学術振興会, 科学研究費助成事業 基盤研究(A), 基盤研究(A), 神戸大学, 05 Apr. 2021 - 31 Mar. 2025
    1.新規水チャネル型FO膜の創製 1-1.環状ペプチド分子集合体チャネル膜の創製(松山、吉岡、佐伯):分子動力学計算に基づき分子設計された種々の環状ペプチドについて、リン脂質二分膜へ導入してペプチドチャネル型FO膜作成を行った。1-2.イオンビーム飛跡グラフト重合法によるナノウォーターチャネルFO膜の構築(比嘉):ポリエチレンフィルムにXeイオンビームを照射後、クロロメチルスチレンのグラフト重合を行うことでナノチャネル作成を試みた。照射前後の膜電位測定でグラフト鎖の導入を確認した。1-3.革新的ロバスト無機ゼオライトFO膜の創製(松方):孔構造の異なる支持体上にゼオライト膜を製膜しそのFO膜特性の評価を行った。支持体構造がゼオライト膜の水透過性に影響することが明らかになった。1-4.計算機科学による高機能FO膜開発支援 (吉岡):Amphotericin Bの環状ペプチドの一部の水酸基を水素に置換することで疎水化したチャネルモデルがより高い透水性を示すことを分子動力学(MD)シミュレーションで見出した。 2.新規刺激応答性駆動溶液(DS)の創製 2-1.熱応答性イオン液体DSの創製(小野、松岡):種々の水素結合性官能基を有するカチオンと、疎水的なアニオンであるbis(trifluoromethylsulfonyl)imideからなる数種の上限臨界溶液温度型イオン液体を開発した。2-2.刺激応答性有機ポリマーDSの開発(中川):親水的なエチレンオキサイド(EO)及び疎水的なブチレンオキサイド(BO)の共重合比によって相分離挙動を制御する下限臨界溶液温度型コポリマーDSを開発した。 3.FO膜透過とDS再生を含む連続システムによるFS評価とFO膜システムの実証(松山、神尾):開発DSを用いて連続再生するFOシステムのラボ実験を行い、透水性能評価とともに物質収支データを収集した。

  • 項目2-2 NH4+の分離濃縮による資源化に関する研究開発
    NEDO, ムーンショット型研究開発事業/産業活動由来の希薄な窒素化合物の循環技術創出, Oct. 2020 - Mar. 2025, Coinvestigator

  • Depelopment of microporous TiO2-ZrO2-organic composite membranes with ultra-high permeability for organic solvent liquid phase separation
    吉岡 朋久, 中川 敬三, 新谷 卓司
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2020 - 31 Mar. 2023
    1.TiO2-ZrO2-有機キレート配位子(OCL)複合ゲル粉体の特性評価 OCLとしてMethyl gallate (MG), Ethyl ferulate (EF), および3,5-di-tert-butylcatechol (DTBC) をTiとZrのアルコキシドに配位させ,ゾル-ゲル法によってTiO2-ZrO2-OCL複合ゾルを調製した.ゾルを乾燥させたゲル試料のTG測定,焼成した粉体試料のXRD,FT-IR測定を行った.600 oCで焼成した粉体試料のXRD測定により,結晶化ピークが観察されなかったことから,TiO2とZrO2の複合化が示された.TG測定により,試料中のOCLが段階的に分解することが示唆され,OCLの構造が異なることがFT-IRの結果から確認された. 2.TiO2-ZrO2複合アモルファス膜の作製と膜構造評価 多孔質基材上に,調製したゾルをコーティングして,300, 350, 500 oC(空気中),300 oC(N2中)で焼成することによりTiO2-ZrO2-DTBC複合膜を,300 oC(N2中)で焼成することによりTiO2-ZrO2-MGおよびTiO2-ZrO2-EF複合膜を作製した.ナノパームポロメトリー法や分画分子量測定,ガス透過測定を行うことで膜の細孔構造を評価した.TiO2-ZrO2-DTBC複合膜の平均細孔径は焼成条件に依存し,約1.0~2.0 nmであった.これらの膜の分画分子量は500~1700であり,この分子量相当の溶質分子径はナノパームポロメトリー法における平均細孔径と一致した.また,MGあるいはEFを配位させたTiO2-ZrO2複合膜は分子ふるい性を示すことが確認され,TiO2-ZrO2-MG膜のHe/CO2透過率比は約60倍を示した.有機キレート配位子の側鎖構造が異なることにより,透過選択性が異なることが確認された.

  • ナノシート積層型有機溶剤ナノろ過膜の開発による省エネルギー溶剤回収
    中川敬三, Kecheng Guan
    NEDO, 官民による若手研究者発掘支援事業/マッチングサポートフェーズ(環境・エネルギー分野), Jan. 2022 - Mar. 2023, Principal investigator

  • Development of ultrathin separation membranes utilizing 2D nanosheet materials for water treatment
    Nakagawa Keizo
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), Kobe University, 01 Apr. 2019 - 31 Mar. 2022
    Inorganic membranes have excellent chemical resistance and mechanical strength. Therefore, the inorganic membranes have a wide range of applications, a long membrane life, and relatively high separation property. However, there are problems in terms of permeance, membrane-forming, and manufacturing cost. In this study, we have developed ultrathin laminar membranes using graphene oxide and niobate nanosheets for water treatment. The composite membranes showed higher separation properties of salts than each single laminar membrane. From the results of structural analysis such as the positron annihilation method and molecular dynamics simulation, it was clarified that high separation performance is exhibited by the formation of an interfacial dense heterolayer between different nanosheet layers.

  • Matsuyama Hideto
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Kobe University, 01 Apr. 2018 - 31 Mar. 2022
    The forward osmosis (FO) membrane process is an ultimate energy-saving membrane separation water treatment method that utilizes the phenomenon of spontaneous water movement through osmotic pressure difference. In this study, we created an original, innovative, and highly water-permeable water channel substance specialized for forward osmosis process, created a channel-type FO membrane incorporating the water channel substance, and created a novel ionic liquid-type draw solution (DS) that is temperature-responsive and can be recovered and regenerated by thermal phase separation. We also developed a water treatment process using these membrane and DS, and achieved a significantly energy-saving seawater desalination process that consumes less energy than the conventional reverse osmosis membrane method.
    Competitive research funding

  • 有機溶剤の超ろ過膜法開発による化学品製造プロセス革新
    NEDO, 平成30年度エネルギー・環境新技術先導プログラム, Jun. 2018 - May 2020, Coinvestigator

  • Nakagawa Keizo
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), Kobe University, 01 Apr. 2016 - 31 Mar. 2019, Principal investigator
    Porous inorganic membranes have advantages of high temperature resistance, chemical stability and mechanical strength, therefore, various researches for water treatment have been investigated. In this study, stacked nanosheet membranes utilizing two-dimensional nanosheets were fabricated for the development of functional inorganic membranes with superior water permeability, separation performance as well as high antifouling property. We have successfully fabricated the stacked nanosheet membranes with high structural stability using simple vacuum filtration method. The nanosheet membranes show high rejection against anionic organic dyes and divalent salts, which were found to act as nanofiltration. Furthermore, the fouling resistance with recovery function of water flux under ultraviolet light irradiation was also confirmed.
    Competitive research funding

  • 正浸透膜法を用いた革新的省エネ型水処理技術の開発
    NEDO, 平成27年度エネルギー・環境新技術先導プログラム, Jan. 2016 - Dec. 2018, Coinvestigator

  • Matsuyama Hideto, MIYATA Takashi, KUMANO Atsuo
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Kobe University, 01 Apr. 2015 - 31 Mar. 2018
    In this study, innovative forward osmosis (FO) membranes and draw solutions (DSs) were developed for the purpose of construction of water treatment process with infinitely close to zero energy consumption. The water channel membrane with biomimetic property having high water permeability and high salt rejection, hydrogel membrane with micro-phase separation and electrostatic repulsion property, and robust inorganic membrane with high organic solvent resistance and high mechanical strength were successfully developed as FO membranes. In addition, photo-responsive DS and both carbon dioxide responsive and thermo-responsive DS were developed as novel regenerable DSs.
    Competitive research funding

  • New approach of preparation of thin and durable Pd membrane by introduction of double silica layers into porous SUS support
    Katoh Masahiro, NAKAGAWA Keizo
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), The University of Tokushima, 01 Apr. 2013 - 31 Mar. 2016
    In this study, thin and durable palladium (Pd) membranes were prepared by a new approach. Double intermediate layers were introduced into porous stainless steel (PSS) supports. The purposes were to modify the pore size of the PSS support and to improve the hydrogen permeability. At first, silicalite with micro pores and mesoporous silica (MCM-48) were selected as double layers. But the mechanical strength of these layers were not enough for electro-less plating of Pd on layers. For an enhancement of durability of intermediate layers, an alumina (boehmite) layer with mesopores was choose as an upper intermediate layer. As the results, Pd membrane with mesoporous silica showed high hydrogen permeance and Pd membrane with silicalite showed no helium permeance at room temperature. The results of this research show that the introduction of double intermediate layers into porous stainless steel support was effective for controlling both hydrogen permeance and selectivity.

  • Development of layered nanosheet photocatalysts using lamellar phase as a template and their catalytic properties
    Nakagawa Keizo, SUGIYAMA SHIGERU, KATOH MASAHIRO
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), The University of Tokushima, 01 Apr. 2013 - 31 Mar. 2016
    Two dimensional transition metal oxide sheets are expected to be utilized in various scientific fields because of their attractive features such as high surface areas and unique surface properties. However, improvements in the preparation method and application for the photocatalysts should be necessary. In this study, nanosheet composite photocatalysts are prepared toward the development of high functional photocatalysts. Single molecular sheets of niobate are successfully prepared by a simple bottom-up approach and show superior photocatalytic activity for hydrogen evolution from water under UV light irradiation. Photocatalytic hydrogen evolution activity is much enhanced over composite of single niobate sheets with other materials such as graphene and MoS2 due to efficient electron transfer and charge separation.

  • Development of palladium-catalysts un-doped with heavy metals using the characteristics of the catalytic fields
    SUGIYAMA Shigeru, SOTOWA Ken-Ichiro, NAKAGAWA Keizo
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), The University of Tokushima, 01 Apr. 2012 - 31 Mar. 2015
    In the catalytic liquid-phase oxidation, dissolution of gaseous oxygen may be the rate determining step. In the present study, the heterogeneous and homogeneous catalytic oxidations in a liquid phase wers examined using a micro reactor, in which the slug flow can be easily formed. The slug flow has an advantageous property, in which the rate of the dissolution of gaseous oxygen is enhanced. As an example obtained in the present study, in the oxidation of ethyl lactate to the ethyl pyruvate using VOCl3, that is, homogeneous catalytic system, the yield of ethyl pyruvate was enhanced by 8% on using the microreactor. In the palladium catalyst system for the liquid phase oxidation, the doping of the palladium catalyst with heavy metals is sometimes needed due to a lack of oxygen in the liquid. However, the results obtained in the present reaction indicates that doping of palladium catalyst with heavy metal is not needed in using the micro reactor.

  • 中川 敬三
    産学が連携した研究開発成果の展開 研究成果展開事業 研究成果最適展開支援プログラム(A-STEP) 探索タイプ, 徳島大学, 2012 - 2013
    自己組織化プロセスによるラメラ相鋳型法により開発した層状ナノシート光触媒を含むゲルを利用してチタニア電極を作製し、色素増感太陽電池への応用を行った。ナノシート層間に新しい物質粒子層の積層ナノシート構造を形成させ、層状構造の耐久性を向上させることに成功した。しかし、有機色素の光分解実験においては活性が得られ無い等の電極として実用するための今後の研究課題も見つかった。一方、色素増感太陽電池の検討では層状ナノシートのみでは効果的な結果が得られなかったものの、P-25と層状ナノシートを混合したゲルを用いて作製した電極では、重量比を変化させた際にP-25標準電極を上回る変換効率が得られた。今後低温焼成による電極作製法の確立等によりさらなる効率の改善が期待できる。

  • Development of functional silica-coated metal catalysts with high durability and superior catalytic activity for dehydrogenation
    NAKAGAWA Keizo
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), The University of Tokushima, 2010 - 2012
    The coverage of metal catalysts with silica layers is an effective method to enhance the stability of catalysts. On the other hand, it brings about the possibility of decrease of activity because the silica coverage could suppress diffusion rate of reactant. In addition, the application could be confined to catalytic reaction associated with small molecules. In this study, we prepared metal catalysts covered with porous and thin silica layers. It was found that the silica-coated metal catalysts had remarkable thermal stability of the metal without major sintering and showed high catalytic activity because the microporous and thin silica layers enable the high diffusion rate.

  • 中川 敬三
    産学が連携した研究開発成果の展開 研究成果展開事業 研究成果最適展開支援プログラム(A-STEP) 探索タイプ, 徳島大学, 2011 - 2011
    可視光型光触媒として期待できる薄片状層状ナノシート光触媒の構造安定化及び機能性向上を目指し、層状構造の層間に無機ピラーを挿入した層状ナノシートを開発した。無機ピラーを層間へ挿入した場合、2次元ナノシート構造の安定化が見られた。一方、可視光照射下における光触媒活性試験では、光触媒活性が向上する成果が得られた。これらの結果により今後光触媒材料の事業化へ向けた取り組みが加速されると共に、層状ナノシートの新規機能性の創出に繋がることから新たな応用展開が期待できる。

  • New strategic study on advanced utilization of rare phosphorus
    SUGIYAMA Shigeru, TANAKA Hideji, ARITA Kenji, UENO Satoru, SOTOWA KenーIchiro, NAKAGAWA Keizo, SHIMABAYASHI Saburo, OOKUBO Akira
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), The University of Tokushima, 2008 - 2010
    Phosphorus is an important element for various advanced materials. However it is pointed out that phosphorus ore, that is a main raw material of phosphorus, will disappear in the near future. Therefore a new system, that is not dependent on phosphorus ore, should be established as early as possible. In order to reply to the serious problem, researchers in the field of engineering, pharmacy and dentistry in the University of Tokushima have extensively studied the followings in the present project : (1) Search of new phosphorus sources and development of the qualitative and quantitative detection technique of various phosphorus-containing compounds. (2) Development of new process for the recovery of aqueous phosphorus-containing compounds. (3) Development of advanced functions of phosphorus-containing compounds. (4) Application of advanced functions of phosphorus-containing compounds.

  • 中川 敬三
    産学が連携した研究開発成果の展開 研究成果展開事業 地域事業 地域イノベーション創出総合支援事業 シーズ発掘試験, 徳島大学, 2009 - 2009, Principal investigator
    光触媒の実用化に向けて、これまで吸着性能や触媒活性の向上などについて検討されているが、材料合成に特別な処理を必要とするためコストの増大は免れず実用化には不向きである。本研究課題では、低コストで合成しうる新規合成法による薄片状金属酸化物ナノシート触媒の合成及び光触媒特性の評価を行い、ナノシートを用いた新たな光触媒開発技術を検討する。

  • Developnent of functional ceria nanosheets catalyst using two dimensional reaction filed
    NAKAGAWA Keizo
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), The University of Tokushima, 2008 - 2009
    Novel functional ceria (CeO_2) nanoparitices with different morphology in hydrothermal solution including carbonate ion have been developed. Cerium carbonate with nanowires, nanorods, nanosheets morphology has been successfully synthesized using surfactants. Their morphologies were sustained after thermal decomposition-oxidation to ceria. Each ceria nanoparticles synthesized using surfactant exhibited higher oxygen storage capacity than ceria nanoparticles synthesized without surfactants. These ceria nanoparticles showed superior activity for the carbon combustion than JRC-CEO-1.

  • 中川 敬三
    産学が連携した研究開発成果の展開 研究成果展開事業 地域事業 地域イノベーション創出総合支援事業 シーズ発掘試験, 徳島大学, 2008 - 2008, Principal investigator
    地球環境問題とエネルギーの安定供給に対する対策として水素利用技術の期待が高まる中,有機ハイドライドの脱水素反応を利用した水素貯蔵・供給システムが注目されている。この反応は吸熱反応であるため高温での反応が有利となるが、高温反応下では触媒担体上の貴金属粒子がシンタリングし、活性低下が起こるため、触媒の長寿命化が望まれている。本研究課題では、シリカ被覆Pt触媒を用いて有機ハイドライド脱水素反応を行い、高温反応下におけるシンタリング耐性に優れた触媒の研究開発を行う。

  • シリカ被覆Ptナノ粒を用いた新規PEFC電極触媒の開発
    中川 敬三
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (Start-up), Grant-in-Aid for Young Scientists (Start-up), 2006 - 2007
    PEFC電極触媒について、アノード電極ではPtのCOによる被毒が、カソード電極ではPtの溶出が問題となっている、本研究ではこれらの問題に対応可能なPt電極触媒を最終目標として、シリカ被覆Ptナノ粒子を用いた電極触媒の研究開発を行った。以下に得られた結果について示す。 1シリカ被覆PtをPEFCのアノード電極に用いた場合、シリカ層によるH_2とCOの分離により、COを100ppm含む水素を供給した場合でCO被毒耐性が得られた。またシリカ被覆PtにCoを添加し700℃でエチレン分解を行うことでカーボンナノチューブ(CNT)を生成させた場合、高い発電特性が得られたが、一方CO被毒耐性が低下した。シリカ内部のPt上で水素が活性化され、生成した電子がCNTにより効率よく移動したため発電特性は向上するが、CNT生成に伴いシリカの細孔構造が崩れたためCO被毒耐性を保つには至らなかったと考えられる。CO被毒耐性については、今後シリカ被覆Pt触媒の電子伝導性の向上に対する別のアプローチが必要であると考える。 2カーボンナノチューブを生成したシリカ被覆Pt触媒をカソード電極に用いて、電位変動によるPt溶出耐久試験を行った。炭素担持Pt触媒では500回のサイクルで発電特性が半減したものの、シリカ被覆Pt触媒ではPtのシンタリングを抑制させることができ、発電特性が保たれるという結果が得られ、高い溶出耐性が示された。このようにPt溶出耐性について、シリカ被覆Pt触媒が有効であるという重要な知見が得られた。

■ Industrial Property Rights
  • ナノシート積層型分離膜及びその製造方法
    中川 敬三, 佐伯 大輔, 山下 洋令, 新谷 卓司, 吉岡 朋久, 松山 秀人
    JP2017029627, 18 Aug. 2017, 国立大学法人神戸大学, WO2018-038013, 01 Mar. 2018
    Patent right

  • 触媒構造体および水素製造装置
    加藤 雅裕, 真田 雅和, 中川 敬三
    特願2014-258550, 22 Dec. 2014, 国立大学法人徳島大学, 株式会社SCREENホールディングス, 特開2016-117028, 30 Jun. 2016
    Patent right

  • 薄片様層状化合物
    中川 敬三, 杉山 茂, 外輪 健一郎
    特願2009-208349, 09 Sep. 2009, 国立大学法人徳島大学, 特開2011-056390, 24 Mar. 2011, 特許第5470639号, 14 Feb. 2014
    Patent right

  • 複合ナノシート及びその製造方法、並びに金属酸化物ナノシートの製造方法
    足立 基齊, 中川 敬三, 村田 雄輔, 佐郷 賢亮, 西川 幸宏
    特願2006-528845, 01 Jul. 2005, 国立大学法人京都大学, 特許第4765079号, 24 Jun. 2011
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