Research activity information

• May 2019 粉体工学会2019年度春季研究発表会, ベストプレゼンテーション賞, リキッドマーブルを用いたマイクロ空間における BZ 反応の挙動

  岡本泰直, 田上隼也, 名和愛利香, 山本大吾, 藤井秀司, 塩井章久


• Nov. 2018 13th Japan-Korea Symposium on Materials & Interfaces, Poster Award, Quantification of mixing state in solutions with chemical waves induced by Belousov-Zhabotinsky reaction

  岡本泰直,名和愛利香,山本大吾,塩井章久


• Nov. 2016 12th Japan-Korea Symposium on Materials & Interfaces, Poster Award, Effects of mixing in solutions on chemical waves formed by Belousov-Zhabotinsky reaction

  岡本泰直,山本大吾,塩井章久

• Fouling-resistant superhydrophobic polyketone membranes modified with fluorine-containing silica for water-in-oil emulsion separation

  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

  [Refereed]

  Scientific journal


• Treatment of high-strength wastewater with coupled flocculation and membrane filtration prior to ammoniacal nitrogen enrichment by osmotically assisted reverse osmosis

  Ralph Rolly Gonzales, Keizo Nakagawa, Susumu Hasegawa, Kazuo Kumagai, Atsushi Matsuoka, Yasunao Okamoto, Zhan Li, Zhaohuan Mai, Tomohisa Yoshioka, Tomoyuki Hori, Hideto Matsuyama

  Elsevier BV, Jan. 2025, Separation and Purification Technology, 352, 128159 - 128159

  [Refereed]

  Scientific journal


• Self‐Aggregation Control of Porphyrin for Enhanced Selective Covalent Organic Network Membranes

  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.

  Wiley, Nov. 2024, Small

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Chitin-augmented wetting resistance and water-in-oil emulsion separation performance of silane-modified polyketone membrane

  Muhammad Prayogie Aulia, Ralph Rolly Gonzales, Miki Tabuchi, Tooru Kitagawa, Yasunao Okamoto, Pengfei Zhang, Nasrul Arahman, Tomohisa Yoshioka, Keizo Nakagawa, Hideto Matsuyama

  Elsevier BV, Oct. 2024, Journal of Membrane Science, 710, 123115 - 123115

  [Refereed]

  Scientific journal


• Collective motion of catalytic particles driven by abiotic aerobic metabolism

  Daigo Yamamoto, Tsuyoshi Takada, Yuto Io, Masaki Kubouchi, Yasunao Okamoto, Erika Okita, Kenichi Yoshikawa, Akihisa Shioi

  Jun. 2024, Colloids and Surfaces A, 698, 134580, English, International magazine

  [Refereed]

  Scientific journal


• Pervaporation dehydration of an isopropanol aqueous solution using microporous TiO2-SiO2-OCL (Organic chelating Ligand) composite membranes prepared under different firing conditions

  Takaya Fujiki, Megumi Kaji, Yuuya Tamamizu, Ryuuki Yasunari, Keizo Nakagawa, Tooru Kitagawa, Yasunao Okamoto, Atsushi Matsuoka, Eiji Kamio, Hideto Matsuyama, Tomohisa Yoshioka

  Jun. 2024, Separation and Purification Technology, 337

  [Refereed]

  Scientific journal


• The Reversible Transformation of a Vesicular Aggregate in Response to a pH Oscillation

  Moeka Shimada, Risa Someya, Yasunao Okamoto, Daigo Yamamoto, Akihisa Shioi

  MDPI AG, Mar. 2024, Processes, 12(3) (3), 514 - 514

  [Refereed]

  Scientific journal


• Fundamental Investigation on Osmotic Pressure and Phase Behavior of Novel pH-Responsive Draw Solute with Imine-Based Dynamic Covalent Chemistry

  Atsushi Matsuoka, Masayuki Fukushima, Eiji Kamio, Tomohisa Yoshioka, Keizo Nakagawa, Yasunao Okamoto, Hideto Matsuyama

  Nov. 2023, Industrial and Engineering Chemistry Research, 62(46) (46), 19845 - 19854

  [Refereed]

  Scientific journal


• The effects of firing temperature and Ti/Si ratio on the H2 permeation characteristics of microporous TiO2-SiO2-organic chelating-ligand composite membranes

  Etsuko Tachi, Tomohisa Yoshioka, Takaya Fujiki, Ryuuki Yasunari, Keizo Nakagawa, Tooru Kitagawa, Yasunao Okamoto, Atsushi Matsuoka, Eiji Kamio, Hideto Matsuyama

  Oct. 2023, Separation and Purification Technology, 322

  [Refereed]

  Scientific journal


• Droplet duos on water display pairing, autonomous motion, and periodic eruption

  Yutaka Sumino, Ryo Yamashita, Kazuki Miyaji, Hiroaki Ishikawa, Maho Otani, Daigo Yamamoto, Erika Okita, Yasunao Okamoto, Marie Pierre Kraff, Kenichi Yoshikawa, Akihisa Shioi

  Jul. 2023, Scientific Reports, 13(1) (1), 12377 - 12377, English, International magazine

  [Refereed]

  Scientific journal


• Organic solvent reverse osmosis characteristics of TiO2-ZrO2-organic chelating ligand (OCL) composite membranes using OCLs with different molecular sizes

  Shunsuke Kitamura, Tomohisa Yoshioka, Keizo Nakagawa, Tooru Kitagawa, Yasunao Okamoto, Atsushi Matsuoka, Eiji Kamio, Hideto Matsuyama

  Jun. 2023, Separation and Purification Technology, 315

  [Refereed]

  Scientific journal


• Two-Dimensional Interlayer Space Induced Horizontal Transformation of Metal-Organic Framework Nanosheets for Highly Permeable Nanofiltration Membranes.

  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

  Apr. 2023, Small (Weinheim an der Bergstrasse, Germany), 19(33) (33), e2300672, English, International magazine

  [Refereed]

  Scientific journal


• Reversed spin of a ratchet motor on a vibrating water bed

  Miku Hatatani, Yasunao Okamoto, Daigo Yamamoto, Akihisa Shioi

  Springer Science and Business Media LLC, Aug. 2022, Scientific Reports, 12(1) (1), 14141 - 14141, English, International magazine

  [Refereed]

  Scientific journal


• Star-Shaped Peptide–Polymer Hybrids as Fast pH-Responsive Supramolecular Hydrogels

  Tomoyuki Koga, Yuta Oatari, Hideki Motoda, Shin-nosuke Nishimura, Yoko Sasaki, Yasunao Okamoto, Daigo Yamamoto, Akihisa Shioi, Nobuyuki Higashi

  American Chemical Society (ACS), Jun. 2022, Biomacromolecules, 23(7) (7), 2941 - 2950, English, International magazine

  [Refereed]

  Scientific journal


• Detection of Inhomogeneity After Mixing Solutions by Analyzing the Chemical Wave Pattern in the Belousov-Zhabotinsky Reaction

  Yasunao Okamoto, Erika Okita, Daigo Yamamoto, Satoshi Nakata, Akihisa Shioi

  Lead, Frontiers Media SA, May 2022, Frontiers in Physics, 10(895824) (895824), 1 - 10, English

  [Refereed][Invited]

  Scientific journal


• Elucidation of Synthetic Mechanism of Various Metal Nanoparticles through Unidirectional Diffusion in a Gel

  Masaki Murakami, Kento Obayashi, Yasunao Okamoto, Akihisa Shioi, Daigo Yamamoto

  The Society of Powder Technology, Japan, Mar. 2022, Journal of the Society of Powder Technology, Japan, 59(3) (3), 108 - 114

  [Refereed]

  Scientific journal


• Energy flux on a micromotor operating under stationary direct current voltage

  Wenyu Zhang, Kohei Ohara, Yasunao Okamoto, Erika Nawa-Okita, Daigo Yamamoto, Akihisa Shioi

  Elsevier BV, Oct. 2021, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 627, 127197 - 127197

  [Refereed]

  Scientific journal


• Particle layer effect of liquid marble on Belouzov–Zhabotinsky reaction

  Yasunao Okamoto, Jun'ya Tanoue, Daigo Yamamoto, Akihisa Shioi

  Lead, Sep. 2021, JSST2021 The 40th JSST Annual International Conference on Simulation Technology Conference Proceedings

  [Refereed]

  International conference proceedings


• Mode Bifurcation on Contact Line Dynamics at Oil/Water Interface Depending on the Contact Line Length

  Daigo Yamamoto, Jumpei Maeno, Yuki Manabe, Yasunao Okamoto, Erika Nawa-Okita, Akihisa Shioi

  Frontiers Media SA, Jul. 2021, Frontiers in Chemistry, 9, 708633 - 708633, English, International magazine

  [Refereed]

  Scientific journal


• Horizontal spin of ratchet motor by vertical agitation

  Toshinobu Takahashi, Erika Okita, Daigo Yamamoto, Yasunao Okamoto, Akihisa Shioi

  Springer Science and Business Media LLC, Jun. 2021, Scientific Reports, 11(1) (1), 11983 - 11983, English, International magazine

  [Refereed]

  Scientific journal


• Energy Conversion Efficiency of Micromotor System

  Wenyu Zhang, Yasunao Okamoto, Daigo Yamamoto, Akihisa Shioi

  The Chemical Society of Japan, Jan. 2021, Chemistry Letters, 50(4) (4), 661 - 663

  [Refereed]

  Scientific journal


• The Behavior of BZ Reaction in Small Space with Liquid Marble

  Yasunao Okamoto, Jun’ya Tanoue, Erika Nawa-Okita, Daigo Yamamoto, Syuji Fujii, Taisuke Maki, Kazuhiro Mae, Akihisa Shioi

  Lead, The Society of Powder Technology, Japan, Feb. 2020, Journal of the Society of Powder Technology, Japan, 57(2) (2), 74 - 79

  [Refereed][Invited]

  Scientific journal


• Autonomous Movement System Induced by Synergy between pH Oscillation and a pH-Responsive Oil Droplet

  Yasunao Okamoto, Yoko Sasaki, Erika Nawa-Okita, Daigo Yamamoto, Akihisa Shioi

  Lead, American Chemical Society (ACS), Nov. 2019, Langmuir, 35(44) (44), 14266 - 14271, English, International magazine

  [Refereed]

  Scientific journal


• Coupling of Two Microbeads Exhibiting Different Features of Oscillations in the Belousov-Zhabotinsky Reaction

  Masakazu Kuze, Yuri Hiranishi, Yasunao Okamoto, Akihisa Shioi, Satoshi Nakata

  Aug. 2019, Chemistry Letters, 48(8) (8), 847 - 850, English

  [Refereed]

  Scientific journal


• Creation of Active Matter and Building of Active Transfer System Driven by pH Oscillation

  Yasunao OKAMOTO, Akihisa SHIOI

  Lead, Hosokawa Powder Technology Foundation, 2018, Hosokawa Powder Technology Foundation ANNUAL REPORT, 26(0) (0), 161 - 165

  [Refereed]

  Scientific journal

• Chemoresponsive Materials: Smart Materials for Chemical and Biological Stimulation: Edition 2

  Akihisa Shioi, Daigo Yamamoto, Yasunao Okamoto

  Joint work, The Royal Society of Chemistry, Jul. 2022, ISBN: 9781839162770

• 垂直振動を与えた水面上の歯車の運動

  畑谷実玖, 岡本泰直, 山本大吾, 塩井章久

  日本物理学会 第77回年次大会, Mar. 2022


• BZ 反応による 一次元混合状態の推定

  岡本泰直

  化学工学会第87年会, Mar. 2022


• Pt粒子の集団運動によって発現する物質の能動輸送

  松田 直樹, 岡本 泰直, 塩井 章久, 山本 大吾

  化学工学会関西大会2021, Dec. 2021


• ガラス基板上での自走性油水液滴の二次元的運動における履歴特性

  奥野剛大, 岡本泰直, 山本大吾, 塩井章久

  第31回 非線形反応と協同現象研究会, Dec. 2021


• 拡散混合を用いた様々な金属ナノ粒子の合成機構の解明

  村上雅樹, 岡本泰直, 塩井章久, 山本大吾

  化学工学会 関西支部大会 2021, Dec. 2021


• Particle layer effect of liquid marble on Belouzov–Zhabotinsky reaction

  Yasunao Okamoto, Jun'ya Tanoue, Daigo Yamamoto, Akihisa Shioi

  JSST 2021 The 40th JSST Annual International Conference on Simulation Technology, Sep. 2021

  Oral presentation


• 上下振動を与えた粒子層上の歯車の回転運動

  高橋俊敦, 沖田愛利香, 岡本泰直, 山本大吾, 塩井章久

  化学工学会 第52回秋季大会, Sep. 2021


• 一方拡散を用いた金属微粒子の形成機構の解明

  村上雅樹, 大林健人, 岡本泰直, 塩井章久, 山本大吾

  2021年度粉体工学会 春期研究発表会, Jun. 2021

  Oral presentation


• 非線形同期を利用した吸脱着過程と巨視的運動状態の相互作用に関する研究

  塩井 章久, 笠井 柾宏, 山本 大吾, 沖田 愛利香, 岡本 泰直

  化学工学会 第86年会, Mar. 2021


• 様々な有機燃料下における自走性微粒子の集団運動

  仕名野 弘貴, 岡本 泰直, 山本 大吾, 塩井 章久

  第23回化学工学会学生発表会, Mar. 2021


• pH振動反応下におけるpH応答性油滴の自律運動

  岡本泰直

  第２回 非線形科学オンライン研究会（若手の会）― 非平衡下で時空間発展する現象 ―, Jul. 2020

• 粉体工学会


• 化学工学会

• Study of autonomous movement of pH-responsive oil droplet on pH oscillation

  Okamoto Yasunao

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Research Activity Start-up, Doshisha University, 11 Sep. 2020 - 31 Mar. 2022

  The autonomous moving system and its mechanism has been studied with pH-responsive dropllet (surfactant) on pH oscillation reaction. One system represents the autonomous and sustainable movement, and this can be caused by the surface surfactant gradient due to the limitation of the space and the solubility of the surfactant. Unlike this droplet, another droplet containing another surfactant on pH gradient travels autonomously along the boundary of pH.


• pH振動反応を用いたアクティブマターの創生と能動輸 送系の構築

  岡本泰直, 塩井章久

  公財）ホソカワ粉体工学振興財団, 研究者育成, 同志社大学, Apr. 2018 - Mar. 2019