蔵岡 孝治 | ![]() |
クラオカ コウジ | |
大学院海事科学研究科 海事科学専攻 | |
教授 | |
応用化学関係 |
2022年07月 日本包装学会, 学生ベストポスター賞, ポリアクリロニトリルを用いたグラフェン分散有機-無機ハイブリッドガスバリア膜の開発
2019年07月 日本包装学会, 学生ベストポスター賞, グラフェンを用いた有機-無機ハイブリッドガスバリア膜の作製
日本包装学会第28回年次大会で最も優れたポスター発表であったため, 日本国国内学会・会議・シンポジウム等の賞
2001年04月 文部科学省, 第60回注目発明, 気相におけるアルコール蒸気阻止膜
1998年05月 日本セラミックス協会, 第53回(平成10年度)日本セラミックス協会技術賞受賞, 新規多孔質ガラスによる高性能分離膜の開発
1997年04月 科学技術庁, 第56回注目発明, 無機キセロゲル膜およびその製造方法ならびに無機キセロゲル膜からなる気体分離膜
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© 2018 Elsevier B.V. We aim to determine the detection threshold of Kapton as an Etched Track Detector irradiated with 345 MeV/u U ion, as well as other several heavy ions of Al, Si, Ar, Kr and Xe. The heavier ions are found to have higher detection threshold in the stopping power. At the same stopping power, the track registration sensitivity decreases with increasing the nuclear charge of ions. U ion has the lowest sensitivity as S = 0.04 at the detection threshold of 3400 keV/μm. We have updated the conventional radial dose distribution theory using a relatively new experimentally supported formula for the effective charge up to U ion. The local doses at a track radius of 0.8 nm, which is half of the length of a repeat unit of Kapton, is useful to understand the relation between the sensitivity of heavy ions and the stopping power at each detection threshold.
Elsevier, 2019年12月01日, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 460, 240 - 243, 英語[査読有り]
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© 2017 Elsevier Inc. Properties of modified surface, behavior against salting-out effect, suppressive effect for protein nonspecific adsorption, and wettability were examined using various mercapto compounds bearing methyloligoethylene glycol, oligoethylene glycol, alkyl oligoethylene glycol, alkyl phosphoryl choline, alkyl inverse phosphoryl choline, and alkyl sulfobetaine moieties. The behavior against salting-out effect was examined using gold nanoparticle with PBS and NaCl aqueous solution. The suppressive effect for protein nonspecific adsorption was evaluated by SPR, and the wettability was measured on the SPR chip. The gold nanoparticle modified with 8C3EG, 12C4EG, 12CPC, 6CCP, and 12CCP showed excellent behavior against salting-out effect. The suppression of protein nonspecific adsorption was effective with 6EG, 12C4EG, 12CPC, and 12CS. On the other hand, the modified surface possessed high wettability except for the surface modified with M6EG. The results indicate that incorporation of alkyl group into surface modification materials is effective for the enhancement of behavior against salting-out effect and suppressive effect for protein nonspecific adsorption regardless of wettability. Among the zwitter ionic derivatives, inverse phosphoryl choline derivatives showed intriguing properties, high behavior against salting-out effect with high wettability but low suppressive effect for protein nonspecific adsorption.
2017年07月01日, Journal of Colloid and Interface Science, 497, 309 - 316, 英語[査読有り]
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Highly ethylene-selective organic inorganic hybrid membranes were prepared via sol gel method and Ag+-exchange treatment. The ratio of the permeance, C2H4/C2H6 through the membrane was more than 90 at 373 K and showed a dependence on temperature. Increase in the measurement temperature promoted the decomplexation of C2H4 from sites. The membrane indicates C2H4 selectivity even at relatively high temperature and at 298 K using a mixture of 50% C2H4-50% C2H6 as feed gas.
CHEMICAL SOC JAPAN, 2014年05月, CHEMISTRY LETTERS, 43 (5), 582 - 583, 英語[査読有り]
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Silica/poly(butylene succinate-co-adipate) organic-inorganic hybrid biodegradable materials were prepared by the sol-gel method. Fourier-transform infrared spectroscopy (FT-IR) and Thermogravimetry/differential thermal analysis (TG/DTA) indicated that the inorganic (SiO(2), C(6)H(5)SiO(3/2)) and organic (PBSA) components were well dispersed in the hybrid material. Heat resistant test shows that the hybrid material was both heat resistant and flexible. The presence of phenyl groups and siloxane network was responsible for the flexibility and heat resistance.
SPRINGER, 2011年03月, Journal of Polymer Research, 18 (2), 279 - 282, 英語[査読有り]
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Silica/poly(vinyl alcohol) (PVA) organic-inorganic hybrid gas barrier films were prepared by sol-gel method with microwave irradiation using tetraethoxysilane (TEOS), methyltriethoxysilane (MeTEOS) and poly(vinyl alcohol) on polypropylene (PP) substrates. Oxygen permeation through the films was measured by a variable-pressure method. Water vapor transmission rate of the films was also evaluated by dish method. Oxygen permeability coefficients of the hybrid layer was small and about one-sixth of those of poly(vinylidene chloride) (PVDC) and water vapor transmission rate of the hybrid layer was the same order of PVDC. Pencil hardnesses (50 g load) of the PP with the hybrid layers were more than HB. These values were considerably higher than that of PP (6B). These properties were thought to be due to well dispersion of inorganic segments (silica) and organic segments (PVA) at molecular level in the hybrid. From the results, it was found that the organic-inorganic hybrids could be applicable to gas barrier films.
DESALINATION PUBL, 2010年05月, DESALINATION AND WATER TREATMENT, 17 (1-3), 66 - 71, 英語[査読有り]
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Silica/poly(vinyl alcohol) (PVA) organic-inorganic hybrid gas barrier films were prepared by sol-gel method with microwave irradiation using tetraethoxysilane (TEOS), methyltriethoxysilane (MeTEOS) and poly(vinyl alcohol) on polypropylene (PP) substrates. Oxygen permeation through the films was measured by a variable-pressure method. Water vapor transmission rate of the films was also evaluated by dish method. Oxygen permeability coefficients of the hybrid layer was small and about one-sixth of those of poly(vinylidene chloride) (PVDC) and water vapor transmission rate of the hybrid layer was the same order of PVDC. Pencil hardnesses (50 g load) of the PP with the hybrid layers were more than HB. These values were considerably higher than that of PP (6B). These properties were thought to be due to well dispersion of inorganic segments (silica) and organic segments (PVA) at molecular level in the hybrid. From the results, it was found that the organic-inorganic hybrids could be applicable to gas barrier films. © 2010 Desalination Publications.
Taylor and Francis Inc., 2010年, Desalination and Water Treatment, 17 (1-3), 66 - 71, 英語[査読有り]
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Clay/poly(methyl metacrylate) (PMMA) organic-inorganic hybrid gas barrier layers on PP were prepared by photopolymerization. The effects of clay content oil the oxygen barrier property and surface hardness of the films were investigated. Oxygen permeability coefficients of the hybrid layer was small and about eight times higher than that of poly(vinylidene chloride) (PVDC) and water vapor transmission rate of the hybrid layer was the same order of PVDC. Pencil hardnesses (50 g load) of the PP with the hybrid layers were more than B. These values were considerably higher than that of PP (6B). These properties were thought to be due to well dispersion of inorganic segments (clay) and organic segments (PMMA) in the hybrid. From the results, it was found that the organic-inorganic hybrids could be applicable to gas barrier films. (C) 2009 The Ceramic Society of Japan. All rights reserved.
CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI, 2009年11月, JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 117 (1371), 1243 - 1245, 英語[査読有り]
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A proton-conducting solid electrolyte membrane based on polyvinyl phosphonic acid (PVPA) and 3-glycidoxypropyltrimethoxysilane was developed via the sol-gel process. The electrical conductivity of the organically-modified membrane obtained with optimum composition was 3.7 x 10(-2) S.cm(-1) at 353 K under 90% of relative humidity (RH), which was sufficient for its practical use as a solid electrolyte for fuel cells. In addition, a membrane based on polyphosphoric acid (PPA) and alkoxysilane was fabricated for comparison by employing polyethylene glycol dimethacrylate (PDM) as an additive. Though the PPA system (with PDM) exhibited similar electrical conductivity to the PVPA system, the latter had a superior mechanical strength and flexibility. Furthermore, the PVPA-based membrane with optimum composition was thermally stable up to ca. 473 K. The membrane exhibited electrical conductivity of 1.3 x 10(-2) S.cm(-1) at 398 K even under 30% of RE, which was similar to that of Nafion (R) at the same temperature under 100% of RH. (C) 2008 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE BV, 2008年03月, SOLID STATE IONICS, 178 (39-40), 1958 - 1962, 英語[査読有り]
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A cobalt phthalocyanine/porous glass composite membrane for oxygen separation was prepared by ship-m-a-bottle synthesis where encapsulation of cobalt phthalocyanine into pores of porous glass was achieved by chemical vapour deposition using 1,2-dicyanobenzene. Formation of CoPc in the pores of porous glass was confirmed by UV-vis spectroscopy. Single gas permeation through the membrane was measured at 298, 323 and 373 K using O-2 and N-2. Ratio of the permeances, O-2/N-2 through the membrane was about 3. This value was three times higher than the theoretical Knudsen value (O-2/N-2 = 0.94). Binary gas permeation at 298 K was also investigated using a gas mixture of 79% N-2-21% O-2. The ideal separation factor of O-2/N-2 through the membrane was 2.9. This value was the same as the O-2/N-2 selectivity factor calculated from the single gas measurement. This membrane indicates O-2-selectivity even at relatively high temperature and at 298 K using a gas mixture of 79% N-2-21% O-2 as feed gas. (c) 2006 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE BV, 2006年12月, JOURNAL OF MEMBRANE SCIENCE, 286 (1-2), 12 - 14, 英語[査読有り]
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The leaching behavior of Na from soda-lime-silicate glass was investigated by preparing glass powders with average particle diameters of 53 and 19 mu m, and leaching in HNO3 at 90 degrees-140 degrees C. A new theoretical equation for Na leaching from a spherical particle is proposed based on the assumption that a rate-determining process is the three-dimensional self-diffusion of Na in glass. The diffusion constant (D) of Na in glass was obtained by fitting the experimental data to a theoretical equation. The values of D and activation energy obtained are comparable to those obtained in other studies on larger particles.
BLACKWELL PUBLISHING, 2005年10月, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 88 (10), 2962 - 2965, 英語[査読有り]
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A thin palladium film supported on SiO2-modified porous stainless steel has been fabricated by a novel preparation procedure. SiO2 colloid suspensions with different particle sizes were applied to modify the pore size of the substrate and form an intermediate SiO2 layer to support the palladium layer as well. Palladium nuclei were seeded inside the pores of the modified substrate besides some particles deposited over the surface by a chemical vapor deposition process using Pd(F(6)acac)(2) as the metal precursor, and then a palladium layer of 2-6 mu m was prepared by an electroless plating process. The membrane had a H-2 permeance of 2.7 x 10(-6) mol/m(2.)s(.)Pa and a permselectivity of P-H2/P-N2 in the range of 300-450 measured using single pure gases at a pressure difference of 0.5 x 10(5) Pa and at 773 K. The surface morphology and the components of the different layers of the membrane have been studied by scanning electron microscopy and energy-dispersive X-ray analysis. The permeance and permselectivity of the membranes with different thicknesses have bean measured at different temperatures and pressures. The stability of the membrane during the heat cycles indicated that a stable structure of the composite membrane was fabricated. The transportation mechanism is elucidated based on the analysis.
AMER CHEMICAL SOC, 2005年04月, INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 44 (9), 3053 - 3058, 英語[査読有り]
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Inorganic-organic hybrid membranes containing silica as the structure matrix, poly(N-vinylpyrrolidone) (PVP) as the organic mediating agent and silver ions as olefinic carriers were prepared using sol-gel method and dip-coating process. The structure and permeances of the membranes for N-2, He, C2H4, C2H6 at different temperatures indicated that defect-free membranes were obtained and the transportation of the C2H4 through the membranes followed the dissolution and diffusion mechanism. Ideal separation factors of C2H4/C2H6 through the membranes were evaluated at the temperature of 298,373 and 423 K respectively using mixture gas of 50% C2H4-50% C2H6. The results showed that the ideal separation factors of C2H4/C2H6 through the membranes were obviously greater than the ratio of PC2H4/PC2H6 obtained from the single gas measurement due to the hindering effect by the adsorbed C2H4 The ideal separation factors of C2H4/C2H6 increased with temperature and reached 10 at 423 K, which suggested that C2H4 and C2H6 could be separated at lower humidity compared to the reported organic polymer/silver salt membranes in which humidified gases and higher silver loading were usually used. The transport of C2H4 in the inorganic-organic hybrid membrane was proposed to follow the hopping mechanism, that is, olefins moved across the fixed silver sites.
SPRINGER, 2005年03月, JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, 33 (3), 327 - 332, 英語[査読有り]
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An organic-inorganic hybrid ionic conductive material was prepared through oxidation of thiol groups in a surface-modified porous glass. Surface-modified pores in the hybrid materials acted as permeation paths for protons. Proton conductivity of the hybrid material was 4.2 X 10(-2) S/cm at 120degreesC under 100% relative humidity. This hybrid material was thermally stable at high temperature (above 100degreesC) due to the temperature-tolerant inorganic frameworks.
WILEY-BLACKWELL, 2004年03月, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 87 (3), 504 - 506, 英語研究論文(学術雑誌)
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A porous glass membrane modified with sulfonic acid groups was evaluated as a proton-conducting electrolyte in direct methanol fuel cells (DMFCs), and the performance was examined. The cell performance was characterized by voltage vs. current measurements, electrochemical impedance spectroscopy, and methanol permeation (crossover) measurements. When diluted methanol (3 M) was supplied to the cell, the porous glass membrane showed inferior performance compared to Nafion due to lower conductivity of the porous glass membrane. However, the porous glass membrane showed better performance with a 17.5 M methanol solution than the Nafion membrane. This better performance of the porous glass membrane is due to the lower methanol permeation in concentrated methanol solutions. (C) 2004 The Electrochemical Society.
ELECTROCHEMICAL SOC INC, 2004年, ELECTROCHEMICAL AND SOLID STATE LETTERS, 7 (11), A394 - A396, 英語[査読有り]
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Thin Palladiun/SiO2 composite membrane supported on porous stainless steel has been fabricated by a novel preparation procedure. SiO2 colloid suspensions with different particle sizes were applied to modify the pore size of the substrate and also form an intermediate SiO2 layer to support the palladium layer. Palladium nuclei were seeded by a chemical vapor deposition process using Pd(F-6acac)(2) as metal precursor, and then a palladium layer thinner than 10 mum was prepared by electroless plating. The membrane had a hydrogen permeance of 2.7x10(-6) mol/m(2).s.Pa and a permselectivity of P-H2 / P-N2 in the range of 300-400 at 773K. The preparation process showed that SiO2 layer had a unique property for palladium adhesion compared with other studied metal oxides. The seeding process by chemical vapor deposition showed this step is significant for the preparation of a defect-free membrane. A novel electroless plating process was also applied using a weak acidic both, which is different from the usually used basic ones containing N2H4. The surface morphology and component of the membrane have been studied by scanning electron micrograph (SEM) and energy-dispersive X-ray analysis (EDX). The permeance and permselectivity of the membrane to hydrogen have bean measured at different temperatures.
MATERIALS RESEARCH SOCIETY, 2004年, MATERIALS AND TECHNOLOGY FOR HYDROGEN ECONOMY, 801, 217 - 224, 英語[査読有り]
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High performance membranes having aligned nanopores were prepared by an organic-inorganic hybrid process using an electric field to align the liquid crystal molecules therein. © 2004 Royal Society of Chemistry.
2004年, Chemical Communications, 4 (10), 1198 - 1199, 英語[査読有り]
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Thermally stable mesoporous titanium oxide can be synthesized under non-aqueous conditions by reacting a sodium-glycotitanate(IV) complex and hexadecylamine in ethylene glycol. The mesoporous structure is retained after calcination in air at 350 degreesC for 5 h. Modification of the compound with palladium by the deposition-precipitation method results in formation of ultrafine palladium particles. Although a fairly large part of the particles are considered to be confined in the blind pores, the catalytic activity for methanol decomposition to carbon monoxide and hydrogen is significantly higher than that of palladium supported on a commercial titanium oxide. (C) 2003 Elsevier Science B.V. All rights reserved.
ELSEVIER SCIENCE BV, 2003年05月, JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 198 (1-2), 303 - 308, 英語研究論文(学術雑誌)
Ultrafine palladium particles can be deposited on mesoporous cerium oxide by a deposition-precipitation method. After reduction with hydrogen at 300degreesC, palladium on the mesoporous compound is cationic with a valence close to +1 whereas the particles have a metallic structure. The catalytic activity in selective methanol decomposition to hydrogen and carbon monoxide at 180degreesC is significantly higher than that of palladium supported on non-porous cerium oxide, suggesting that the mesoporous structure is advantageous to the reaction. When the palladium content is high, part of mesopores are probably choked with large palladium particles, which will cause saturation of the activity.
KLUWER ACADEMIC/PLENUM PUBL, 2003年05月, CATALYSIS LETTERS, 88 (1-2), 83 - 87, 英語研究論文(学術雑誌)
Microporous layered titanium phenylphosphonate, Ti(O3PC6H5)(2) and sulfonated titanium phenylphosphonate, Ti(O3PC6H4SO3H)(0.89) (O3PC6H5)(1.1).1.8H(2)O were prepared in the presence of sodium dodecylsulfate (SDS). Interplanar spacing (d(001)) of titanium phenylphosphonate is 1.43 nm and after sulfonation it increased to 1.64 nm. The surface area of titanium phenylphosphonate is 264 m(2) g(-1).
CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI, 2003年04月, JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 111 (4), 219 - 221, 英語研究論文(学術雑誌)
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For the purpose of utilizing waste glass as construction materials, i.e., replacement of sand in cement, we studied the extraction of sodium from the soda-lime-silicate glass powders by acid solution. The soda-lime-glass having similar composition of bottle glass was ground to the size smaller than 63mum and leached in nitric acid. The fractions of leached Na and Ca were estimated by analyzing the concentration of those elements in leached solution by atomic absorption spectroscopy and inductively coupled plasma spectroscopy (ICP). The leaching behavior largely depended on the particle size and treatment temperature. It is found that the elusion of Na can be explained by diffusion equation. The preliminary reaction test for this leached glass and cement is also presented.
AMER CERAMIC SOC, 2003年, ENVIRONMENTAL ISSUES AND WASTE MANAGEMENT TECHNOLOGIES IN THE CERAMIC AND NUCLEAR INDUSTRIES VIII, 143, 39 - 46, 英語[査読有り]
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Microporous layered titanium phenylphosphonate, Ti(O3PC6H5)2 and sulfonated titanium phenylphosphonate, Ti(O3PC6H4SO3H)0.89 (O3PC6H5)1.1·1.8H2O were prepared in the presence of sodium dodecylsulfate (SDS). Interplanar spacing (d001) of titanium phenylphosphonate is 1.43 nm and after sulfonation it increased to 1.64 nm. The surface area of titanium phenylphosphonate is 264m2g-1.
Ceramic Society of Japan, 2003年, 公益社団法人日本セラミックス協会 日本セラミックス協会学術論文誌, 111 (1292), 219 - 221, 英語[査読有り]
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Silicalite-1 has been prepared using a novel SiO2-ZrO2 porous glass tube as both a silica source and a substrate. The SiO2ZrO2 glass tube was found to possess sufficient physical strength to enable practical use as a separation and catalytic membrane after silicate-1 deposition within its channel. This is in contrast to porous SiO2 glass which cannot be used to synthesize a silicalite-1 deposited membrane with enough physical strength to perform gas permeance measurements.
AMER CERAMIC SOC, 2002年10月, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 85 (10), 2569 - 2571, 英語[査読有り]
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Novel mesolamellar niobium phosphates have been synthesized using neutral and cationic surfactants. Long range ordered mesostructured lamellar phase was obtained with hexadecylamine (HDA) as a surfactant. A cationic surfactant, cetyltrimethylammonium bromide (CTMABr) gives disordered lamellar structure. Influence of various parameters such as temperature, surfactant/Nb, H3PO4/Nb and method of preparation were studied. Mesolamellar spacing of compounds prepared using HDA is between 3.53 and 4.35 run, depending upon synthesis parameters.
CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI, 2002年10月, JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 110 (10), 890 - 893, 英語[査読有り]
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Silicalite-1 has been prepared using a novel SiO2-ZrO2 porous glass tube as both a silica source and a substrate. The SiO2ZrO2 glass tube was found to possess sufficient physical strength to enable practical use as a separation and catalytic membrane after silicate-1 deposition within its channel. This is in contrast to porous SiO2 glass which cannot be used to synthesize a silicalite-1 deposited membrane with enough physical strength to perform gas permeance measurements.
AMER CERAMIC SOC, 2002年10月, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 85 (10), 2569 - 2571, 英語[査読有り]
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The porous glass membrane modified by hydrophobic organocompound such as octadecyldimethylchlorosilane was prepared and methanol separation using this membrane was attempted to carry out by pervaporation technique.
ELSEVIER SCIENCE BV, 2002年09月, DESALINATION, 148 (1-3), 17 - 18, 英語[査読有り]
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The porous glass membrane modified by hydrophobic organocompound such as octadecyldimethylchlorosilane was prepared and methanol separation using this membrane was attempted to carry out by pervaporation technique.
ELSEVIER SCIENCE BV, 2002年09月, DESALINATION, 148 (1-3), 17 - 18, 英語[査読有り]
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Mesoporous titanostanno silicate, Ti-Sn-M-CM-41 was prepared by direct hydrothermal synthesis. Samples were characterized using XRD, SEM, UV-visible, FT-IR, Sorption techniques (N-2 and H2O), TG-DTA and Si-29 MAS NMR. Sn-containing samples are more hydrophilic in nature and contain more hydroxyl groups in comparison to Si-MCM-41. The selectivity of cyclohexene to cyclohexene oxide in the presence of tert-butyl hydroperoxide over Sn-Ti-MCM-41 is higher than Ti-MCM-41.
ELSEVIER SCIENCE BV, 2002年, IMPACT OF ZEOLITES AND OTHER POROUS MATERIALS ON THE NEW TECHNOLOGIES AT THE BEGINNING OF THE NEW MILLENNIUM, PTS A AND B, 142, 1379 - 1386, 英語[査読有り]
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Restructured V-MCM-41 prepared using parent V-MCM-41 (calcined form) via secondary synthesis possessing non-leaching vanadium in framework shows remarkable hydrothermal stability. Samples were characterized using various techniques such as XRD, N-2-sorption, UV-visible, FT-IR, TG-DTA and V-51 MAS NMR. Activity of parent and restructured V-MCM-41 were compare in the oxidation of toluene and 1-naphthol in the presence of aqueous H2O2. Conversion of toluene and 1-naphthol over reused restructured V-MCM-41 are 2 fold more than that of parent V-MCM-41 with similar Si/V ratio.
ELSEVIER SCIENCE BV, 2002年, IMPACT OF ZEOLITES AND OTHER POROUS MATERIALS ON THE NEW TECHNOLOGIES AT THE BEGINNING OF THE NEW MILLENNIUM, PTS A AND B, 142, 1307 - 1314, 英語[査読有り]
研究論文(学術雑誌)
Titanium containing ethane bridged hybrid mesoporous materials with uniform hexagonal arrangement are prepared by two different routes and characterized using several analytical techniques. The effect of substitution of bridged silsesquioxane precursors for siloxane precursors on the properties of resultant mesoporous bulk materials are also evaluated and discussed in term of mesoscopic order and oxidation catalysis. The materials are highly hydrophobic and selectively epoxidize the alpha-pinene to alpha-pinene oxide ( with >99% selectivity) and display high hydrogen peroxide efficiencies.
ROYAL SOC CHEMISTRY, 2002年, JOURNAL OF MATERIALS CHEMISTRY, 12 (10), 3078 - 3083, 英語[査読有り]
研究論文(学術雑誌)
A high gas selectivity, high flexibility glass hollow-fiber membrane based on spinodal phase separation has been prepared by direct winding from glass melt, followed by acid leaching processing.
ROYAL SOC CHEMISTRY, 2002年, CHEMICAL COMMUNICATIONS, 6 (6), 664 - 665, 英語[査読有り]
研究論文(学術雑誌)
Sodium borosilicate porous glasses arising from spinodal phase separation are promising functional materials for separation membranes, enzyme and catalyst supports, and photonic materials. The present paper studied the effect of the additive of ZrO2 on the spinodal phase separation and pore distribution of the sodium borosilicate glasses using B-11 nuclear magnetic resonance spectrum, Si-29 nuclear magnetic resonance spectrum, mercury measurement, and nitrogen adsorption techniques. The experimental results showed that ZrO2 inhibited both the initiation process in early stage and the coarsening process in later stage of the spinodal phase separation. The pore volume was found to decrease slightly with the addition of ZrO2 at the beginning. However, when ZrO2 content > 7 mass%, the pore volume decreases dramatically with further addition of ZrO2. 65% of the pore volume in the sample without addition of ZrO2 will be lost when the addition amount of ZrO2 increases from 0 to 10 mass%. The inhibition effect on the pore volume is due to the structural change of boron network by the introduction of ZrO2. The oxygen defects, such as oxygen vacancy, which initiates the spinodal phase separation, are reduced during the transformation process from four-coordinated boron to three-coordinated boron by the introduction of ZrO2. The growth of the pore size of the sample, which is controlled by the dynamic process of coarsening in the later stage of the spinodal phase separation, is also inhibited by the introduction of ZrO2. With the addition of zirconia, the three-coordinated boron with stronger bond energy increases. This may reduce the movement of the oxygen-contained boron groups during mass transfer of the coarsening process of the spinodal phase separation, and consequently inhibit the growth of the pore size.
AMER CHEMICAL SOC, 2001年12月, The Journal of Physical Chemistry B, 105 (48), 11949 - 11954, 英語[査読有り]
研究論文(学術雑誌)
Two types of the silica membrane were prepared by the CVD with the aid of evacuation. Porous glass tubes with outer diameter of 5 mm, inner diameter of 4 mm were used as supports. Mean pore diameters of the supports were 4 mn (CVD-1) and 2 nm (CVD-2), respectively. Tetraethoxysilane (TEOS, Si(OC2H5)(4)) and oxygen were used as reactants. The inside of the membrane modules were evacuated with a vacuum pump to deposit silica near the pores preferentially. Due to evaluate methanol vapor separation, mixed gas separation of the membranes were measured using H-2-10%CH3OH and CO-10%CH3OH gas mixtures at 373 and 473 K. At 473 K, the separation factors of H-2/CH3OH were about 6 for CVD-1 and about 20 for CVD-2. These value were higher than that of the porous glass membrane with mean pore diameter of 4 mn (H-2/CH3OH = 1.2). The separation factor for CVD-2 was about 5 times as large as the theoretical Knudsen value (H-2/CH3OH = 4). (C) 2001 Elsevier Science B.V. All rights reserved.
ELSEVIER SCIENCE BV, 2001年10月, SEPARATION AND PURIFICATION TECHNOLOGY, 25 (1-3), 161 - 166, 英語[査読有り]
研究論文(学術雑誌)
Novel inorganic-organic membranes that contained Ag+ ions as olefin carriers were prepared using sol-gel and dip-coating processes. The permeance of the membranes for nitrogen, helium, ethane (C2H6), and ethene (C2H4) were evaluated using the single-gas permeation method at temperatures of 298, 373, and 423 K. The results showed that the selectivity of the membranes to C2H4 against C2H6 increased as the measurement temperature increased, because the decomplexation rate of C2H4 molecules from Ag+ sites is enhanced by increases in the temperature. Fourier transform infrared spectrophotometry of the hybrid membranes and the performance of the membranes at 373 and 423 K indicated that poly(N-vinylpyrrolidone) (PVP) had a role in increasing the flexibility of the inorganic network and also served as a mediation agent to fix Ag+ ions in the polymer segments, because of the coordination interaction between the Ag+ ions and the PVP.
AMER CERAMIC SOC, 2001年03月, Journal of the American Ceramic Society, 84 (3), 654 - 656, 英語[査読有り]
研究論文(学術雑誌)
The present paper describes the synthesis and properties of porous glass membranes surface-modified using organosilane compounds with different hydrocarbon lengths (CnH2n+1(CH3)(2)SiCl; n = 1, 3, 8, 18). Single gas permeation through the membranes was measured at 298, 333 and 373 K using He, N-2, CO2, CH4, C2H6, C3H8, n-C4H10 and i-C4H10. The membranes showed highly selective separation of hydrocarbon gases and high permeances. Hydrocarbon gas selectivity increased with increasing carbon chain length in the hydrocarbon gases and in the organosilane compounds used. For C18 membrane (surface-modified with dimethyloctadecylchlorosilane), the ratio of the permeances, n-C4H10/N-2 was 66.6 at 298 K, 22.5 at 333 K and 14.0 at 373 K. The value at 298 K is around 100 times the theoretical Knudsen value (n-C4H10/N-2 = 0.69). Binary gas permeation at 373 K was also investigated using a gas mixture of 90% CH4-10% n-C4H10. The ideal separation factor of n-C4H10/CH4 through C18 membrane was 8.8, higher than in single gas measurement due to hindering by adsorbed molecules. To evaluate the adsorption affinities of the hydrocarbon gases CH4, C2H6, C3H8, n-C4H10 and i-C4H10 on surface-modified membranes at high temperature, dynamic flow adsorption measurement was performed at 373 K. Due to the low relative pressures, all the isotherms obtained followed Henry's adsorption equation almost exactly. Amounts of hydrocarbon gases adsorbed increased with increasing carbon chain length in the organosilane compounds. These results confirmed that surface modification of porous glass membranes using a covalently bonded molecular monolayer is a special way of altering membrane performance to introduce various organic functionalities. The main frame of surface-modified membrane was inorganic glass with rigid pore. which were modified by the organic monolayer. The permeation paths of gas molecules were maintained due to the small influence of the micro-Brownian motion of the organic chains. These surface-modified membranes, therefore, displayed high thermal stability and high permeance as well as organic functionality (high selectivity). (C) 2001 Elsevier Science B.V. All rights reserved.
ELSEVIER SCIENCE BV, 2001年02月, JOURNAL OF MEMBRANE SCIENCE, 182 (1-2), 139 - 149, 英語[査読有り]
研究論文(学術雑誌)
The effect of Al2O3 on the structure change and the phase separation in Na2O-B2O3-SiO2 glass was investigated using B-11 nuclear magnetic resonance (NMR), Si-29 MAS NMR, and Al-27 MAS NMR together with infrared absorption spectroscopy and field emission scanning electron microscopy (FE-SEM). The results show that the structure change from the introduction of Al2O3 contributes greatly to the inhibition of phase separation. First, the introduction of Al2O3 imparts an ionic character to the boron-oxygen network, resulting in the formation of B-O-Al-O-Si bonds and thus increases the compatibility of the silicon network with the boron-oxygen network. Second, the addition of Al2O3 causes the sodium ion to transfer from the boron-oxygen network to AlO4 tetradedra, changing a number of four-coordinated borons into three-coordinated borons. As the bond energy of the four-coordinated boron is weaker than that of the three-coordinated boron, the -B-O-Si- bond with the four-coordinated boron in Na2O-B2O3-SiO2 glasses is easily broken and results in severe phase separation during heat treatment. However, the -B-O-Al- bond with the three-coordinated boron formed in Na2O-B2O3-SiO2-Al2O3 glasses is difficult to be broken due to the high bond energy. In addition, the silicon network in Na2O-B2O3-SiO2-Al2O3 glasses is also strengthened by the addition of Al2O3, which prevents [BO] groups from further aggregation. As a result, the tendency of the glass towards phase separation is greatly suppressed in the Na2O-B2O3-SiO2-Al2O3 system. (C) 2000 Kluwer Academic Publishers.
KLUWER ACADEMIC PUBL, 2000年10月, Journal of Materials Science, 35 (19), 4865 - 4871, 英語[査読有り]
研究論文(学術雑誌)
[査読有り]
研究論文(学術雑誌)
The kinetics of the phase separation in 15Na(2)O-85B(2)O(3) binary glasses was investigated using B-11 nuclear-magnetic-resonance (NMR) spectra, X-ray diffraction (XRD) and scanning electron microscopy (SEM) observation. It was found that the equilibrium of the phase separation took long time due to the growth of a boron-rich phase and the composition fluctuation in Na-rich phase. Although the XRD results showed that the development of the boron-rich phase was through nucleation and growth, the NMR spectra indicated that the sodium-rich phase always occurred as amorphous glasses with fluctuation in composition during the phase separation. This may result from that the over-coordination of oxygen atoms in the sodium-rich phase, which renders difficulties in the crystallization of the sodium-rich phase with less than 75 mol% sodium oxides. It was found that, at 500 degrees C, the 15Na(2)O-85B(2)O(3) glasses was finally separated into Na2O . 9B(2)O(3) and 3Na(2)O . B2O3 rather than those being proposed by the conventional phase diagram. (C) 2000 Kluwer Academic Publishers.
KLUWER ACADEMIC PUBL, 2000年08月, JOURNAL OF MATERIALS SCIENCE, 35 (15), 3913 - 3921, 英語[査読有り]
研究論文(学術雑誌)
Glass hollow fiber membranes with ultra-micropores (pore diameter less than 1 nm) were prepared by acid leaching. The effects of various acids and leaching times on the preparation of the membranes were investigated. It was found from acid leaching that the sodium ions of the Al-0 (composition: 62.5SiO(2)-28.3B(2)O(3)-9.2Na(2)O wt.%) and Al-3 (composition: 62.5SiO(2)-27.3B(2)O(3)-7.2Na(2)O-3.0Al(2)O(3) wt.%) glass hollow fibers were completely eluted after 10 and 90 min, respectively, with 3 mol/dm(3) HNO3, and after 30 and 90 min, respectively, with 3 mol/dm(3) H3PO4 or 3 mol/dm(3) CH3COOH. Ideal separation factors of H-2/N-2 were measured at 373 K using a gas mixture of 50% H-2-50% N-2. The membranes showed highly selective separation of hydrogen. Values for the Al-0 hollow fiber membrane treated with 3 mol/dm(3) HNO3 reached more than 80. However, ideal separation factors of H-2/N-2 for the Al-3 hollow fiber membranes treated with various acids were smaller. This is thought to be due to the addition of Al2O3. Four coordination aluminum species (AlO4-) are strongly attracted to alkali metal ions because of charge compensation. Sodium ions in the Al-3 glass hollow fibers were, therefore, prevented from moving within the glass network and the destruction of the glass network during acid leaching caused defects in the Al-3 glass hollow fiber membranes. The formation mechanism of the ultra-micropores was also investigated. From N-2 adsorption measurement and gas separation measurement, it was concluded that the ultra-micropores of the membranes were formed by elution of the phase-separated sodium borate-rich phase at sub-nanometer level and that these defect-free membranes could only be obtained by using phase separation rather than elution of homogeneously distributed ions from homogeneous glasses (no phase separation) such as the alkali-silicate glasses reported previously. (C) 2000 Elsevier Science B.V. All rights reserved.
ELSEVIER SCIENCE BV, 2000年08月, JOURNAL OF MEMBRANE SCIENCE, 175 (2), 215 - 223, 英語[査読有り]
研究論文(学術雑誌)
Nuclear magnetic resonance (NMR) spectra have been used to investigate the spinodal phase separation of sodium borosilicate glasses in the early stage, in which the phase separation is induced by rapidly quenching as opposed to heat treatment at a constant temperature. The experimental results show that the spinodal phase separation occurs under the quenching rates of 10(6) and 10 Ws. Although the domain size of the phase separation increases with decreasing quenching rate, B-11 NMR spectra and Si-29 MAS NMR spectra do not vary with the change of the domain size of the spinodal phase separation resulting from oxygen diffusion on quenching. The structure-analysis by NMR measurement indicates that the oxygen diffusion is controlled by a vacancy mechanism. On the basis of these NMR data, a structural model in the initial stage of the spinodal phase separation is proposed. The model suggests that the oxygen vacancy migrates by rotating itself to neighboring-bridged oxygen and reacting with the neighboring-bridged oxygen while the coordination number of the boron and silicon does not change. By the rotation and reaction, borons are connected together along the motion trace of the vacancy. According to the model, double-boron-group chains and triborate-group chains with high connectivity may be formed on rapidly quenched sodium borosilicate glasses.
AMER CHEMICAL SOC, 2000年03月, JOURNAL OF PHYSICAL CHEMISTRY B, 104 (9), 2109 - 2116, 英語[査読有り]
研究論文(学術雑誌)
The B-11 nuclear magnetic resonance (NMR) spectra, together with X-ray diffraction (XRD) and scanning electron microscopy (SEM), have been used to investigate the phase separation in 15Na(2)O-85B(2)O(3) binary glass. Based on the present investigation we suggest that the phase equilibrium in sodium borate glasses is controlled by the rate competition of the nucleation and crystal growth between two immiscible phases rather than those being proposed by the conventional phase diagram. The experimental results show that the sodium-rich phase, after being heat-treated at 500 degrees C, was not Na2O . 4B(2)O(3) as indicated by phase diagram. The over-coordination of oxygen atoms in the sodium-rich phase rendered difficulties in the crystallization of the sodium-rich phase with less than 75 mol % sodium oxide. Therefore, the high growth rate of the boron-rich phase can force the residual glass toward much higher concentrations of sodium oxide. According to the NMR measurements, it was found that, after reaching equilibrium,: the 15Na(2)O-85B(2)O(3) glass separated into Na2O . 9B(2)O(3) and 3Na(2)O . B2O3. (C)2000 Academic Press.
ACADEMIC PRESS INC, 2000年02月, Journal of Solid State Chemistry, 149 (2), 459 - 464, 英語[査読有り]
研究論文(学術雑誌)
A MCM-41/Nafion(R) composite prepared from tetraethoxysilane and Nafion gel solution with cetyltrimethylammonium surfactant, is a highly selective catalyst for alpha-methylstyrene dimerization to form the corresponding acyclic dimer.
ROYAL SOC CHEMISTRY, 2000年, Chemical Communications, 16 (16), 1523 - 1524, 英語[査読有り]
研究論文(学術雑誌)
An aluminosilicate gel barrier as a zeolite precursor is first incorporated in the pores of an alumina support tube and then subjected to hydrothermal crystallization, leading to ZSM-5 zeolite membranes with high compactness at the molecular level.
ROYAL SOC CHEMISTRY, 2000年, CHEMICAL COMMUNICATIONS, 17 (17), 1621 - 1622, 英語[査読有り]
研究論文(学術雑誌)
A novel oxygen selective inorganic-organic hybrid membrane containing (N,N'-disalicylideneethylenediaminato)cobalt(ii) (salcomine) as an oxygen carrier was prepared via the sol-gel method using poly(N-vinylpyrrolidone) (PVP) as the mediation agent.
ROYAL SOC CHEMISTRY, 2000年, CHEMICAL COMMUNICATIONS, 24 (24), 2477 - 2478, 英語[査読有り]
研究論文(学術雑誌)
The kinetics of phase separation in 15Na2O⋅85B2O3 binary glass was investigated using 11B nuclear-magnetic-resonance (NMR) spectra together with X-ray diffraction (XRD) and scanning electron microscopy (SEM). The experimental results showed that the product of sodium-rich phase after heat-treated at 500°C was not Na2O⋅4B2O3 as suggested by previous phase diagram. It was found that the high growth rate of boron-rich phase can force residual glass to much higher concentrations of sodium oxide. After reaching equilibrium, a 15Na2O⋅85B2O3 glass was separated into Na2O⋅9B2O3 and 3Na2O⋅B2O3 according to NMR measurement.
公益社団法人日本セラミックス協会, 1999年12月01日, 日本セラミックス協会学術論文誌, 107 (1252), 1151 - 1155, 英語The kinetics of phase separation in 15Na(2)O . 85B(2)O(3) binary glass was investigated using B-11 nuclear-magnetic-resonance (NMR) spectra together with X-ray diffraction (XRD) and scanning electron microscopy (SEM). The experimental results showed that the product of sodium-rich phase after heat-treated at 500 degrees C was not Na2O . 4B(2)O(3) as suggested by previous phase diagram. It was found that the high growth rate of boron-rich phase can force residual glass to much higher concentrations of sodium oxide. After reaching equilibrium, a 15Na(2)O . 85B(2)O(3) glass was separated into Na2O . 9B(2)O(3) and 3Na(2)O . B2O3 according to NMR measurement.
CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI, 1999年12月, Journal of the Ceramic Society of Japan, 107 (12), 1151 - 1155, 英語[査読有り]
研究論文(学術雑誌)
The characterization of pores arising from spinodal phase separation in quenched sodium borosilicate glasses is investigated. Theory predicts that the wavelength of the initial stage for spinodal phase separation on cooling is ca. 5-10 nm, whereas after acid leaching, the size of the pore based on so-called spinodal decomposition is much smaller with pores formed in quenched sodium borosilicate glass after leaching being of micropore type with radii of <1 nm. The acid leaching model proposed in the present study suggests that the characteristics of the pores in the quenched glass result from the small amplitude of the spinodal decomposition wave on cooling.
ROYAL SOC CHEMISTRY, 1999年11月, JOURNAL OF MATERIALS CHEMISTRY, 9 (11), 2723 - 2725, 英語[査読有り]
研究論文(学術雑誌)
[査読有り]
研究論文(学術雑誌)
Silica membranes were prepared by depositing silica on porous glass tubes with the aid of evacuation using tetraethoxysilane as a reactant in the temperature range 673-773 K. The basic permeation properties of methanol vapor in gas phase were investigated. This membrane appears to hinder permeation of methanol vapor. This behavior is quite different from the original porous glass and other reported membranes. The separation factors of He/CH3OH were 7.1 at 373 K and 16.9 at 473 K. These values are much higher than the Knudsen value (He/CH3OH=2.8). The permeances of He and N-2 through this membrane were also measured for varying temperatures in order to investigate the permeation mechanism. Gas permeation through the membrane was predominantly governed by an activated diffusion mechanism. (C) 1999 Elsevier Science B.V. All rights reserved.
ELSEVIER SCIENCE BV, 1999年07月, JOURNAL OF MEMBRANE SCIENCE, 160 (1), 31 - 39, 英語[査読有り]
研究論文(学術雑誌)
Tubular SiO2-glass membranes with thin, dense SiO2 layers on porous glass supports were prepared via sputtering, using the novel sputtering apparatus for tubular supports. This apparatus had a holder for tubular supports and a rotation mechanism, The sputtering conditions of the membranes were investigated. A support temperature of 573 K was determined to be the best among the temperatures that were selected in our experiments. Scanning electron microscopy observations showed that the membrane surfaces became smooth as the sputtering time increased and had no cracks. The permeances of helium, nitrogen, and CO2 were measured at a temperature of 373 K, The permeances for the membranes were on the order of 10(-9) mol.m(-2).s(-1).Pa-1 (10(-5) cm(3)(STP).cm(-2).s(-1).(cm Hg)(-1)). The ratio of the permeances of helium to nitrogen was similar to the theoretical Knudsen value. These values were much lower than the values that were expected from the dense SiO2 glass. This phenomenon was considered to be attributable to the presence of microcracks during the sputtering deposition.
AMER CERAMIC SOC, 1999年05月, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 82 (5), 1325 - 1328, 英語[査読有り]
研究論文(学術雑誌)
The gas permeability of polymer hybrid membranes has been investigated. The membranes were prepared by dip-coating a methanol solution of poly(N-vinylpyrrolidone) (PVP) and methyltrimethoxysilane (MTMOS) on porous glass tubes. The permeance was measured by using N-2, CO2 and He separately at a pressure of 1 kg cm(-2). It was found that the permeance of these gases all increased with temperature in the PVP hybrid membranes. In particular, the permeance of He increased at a much greater rate with temperature, resulting in high selectivity against N-2. For instance, the permeance of He is 150 times greater than that of N-2 at 100 degrees C. The results indicate the dense structure of PVP hybrid membranes as confirmed by SEM observations. The hybrid membranes also exhibited high selectivity of CO2 against N-2. This could be attributed to the high polarity of amide groups in PVP chains which would facilitate the sorption of CO2. These polymer hybrid membranes were also found to have high thermal stability compared to organic polymer membranes.
ROYAL SOC CHEMISTRY, 1999年, JOURNAL OF MATERIALS CHEMISTRY, 9 (8), 1741 - 1746, 英語[査読有り]
研究論文(学術雑誌)
The methanol decomposition to carbon monoxide and hydrogen is catalyzed at 200 degrees C over nickel supported on porous glasses of which major pore diameters are 4, 19, and 45 nm. The catalyst in which the crystallite size of nickel is close to the pore diameter of 19 nm is the most active while in other samples the crystallite size is significantly different from the pore diameter, suggesting that the reaction over nickel particles is enhanced in the pore of which size is close to that of the particles. (C) 1998 Elsevier Science B.V. All rights reserved.
ELSEVIER SCIENCE BV, 1998年10月, CATALYSIS TODAY, 45 (1-4), 191 - 196, 英語[査読有り]
研究論文(学術雑誌)
The gas separation characteristics of ultramicroporous glass capillary membranes were investigated. Glass capillary membranes which had ultramicropores (pore diameter less than 1 nm) were prepared by elution of alkali metal ions from glass capillaries, It was found from elution treatment that alkali metal ions of 3.5 Na (composition: 77.8 SiO2, 22.2 Na2O mol%) and 3.5 K (composition: 77.8 SiO2, 22.2 K2O mol%) glass capillaries were completely eluted after 90 and 10 minutes with 3 mol/L HNO3, 240 and 10 minutes with 3 mol/L CH3COOH and 3 mol/L H3PO4, respectively. Permeations of N-2, He, and CO2 were measured at 298, 373, and 473 K. Permeation rates of the 3.5 Na and 3.5 K glass capillary membranes were 1-10(-1) (cm(3)(STP).cm(-2).s(-1).cmHg(-1)). The ratios of permeation rates, CO2/N-2 and He/N-2, were similar to the theoretical Knudsen values.
MARCEL DEKKER INC, 1998年, SEPARATION SCIENCE AND TECHNOLOGY, 33 (3), 297 - 309, 英語[査読有り]
研究論文(学術雑誌)
A sol-gel method has been used to prepare particle-dispersed glasses containing superfine (less than 30 nm in diameter) particles of cuprous oxide Cu(2)O. The Xray diffraction spectrum of the bulk material and the absorption spectra of thin (less than 1 mu m thick) films show that partial reduction induced by an exposure to H(2) produces core-shell-structured (Cu(2)O core and Cu shell) superfine-particle-dispersed glasses. Those glasses are stable in a dry atmosphere.
GORDON BREACH PUBLISHING, TAYLOR & FRANCIS GROUP, 1998年, MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 314, 273 - 278, 英語[査読有り]
研究論文(学術雑誌)
E-glass fiber with diameter of 11-12 mu m was prepared and treated in hot dilute hydrochloric acid solution to prepare microporous glass. The surface was leached with 1 mol/l acid and microporous layer was formed. The pore volume and specific surface area of the porous layer initially increased, reached maxima and then decreased with acid treatment. Micropores developed by leaching collapsed after prolonged acid treatment as a result of structural transformation of the leached layer. The leach rate of soluble components decreased with the disappearance of micropores. The pore structure of the fibers treated with 4 mol/l acid altered similarly while the fibers were completely leached in a short period. (C) 1997 Elsevier Science B.V.
ELSEVIER SCIENCE BV, 1997年07月, JOURNAL OF NON-CRYSTALLINE SOLIDS, 215 (2-3), 262 - 270, 英語[査読有り]
研究論文(学術雑誌)
The hydrolysis and condensation of tetramethoxysilane in a DMF solution of polyamides containing LiCl, CaCl2 or ZnCl2, both in presence and absence of polyoxazoline, resulted in the facile formation of polyamide-silica gel hybrids. Films were cast from the resulting mixtures and evaporation of the solvent resulted in the formation of clear, transparent hybrids with the salts dispersed at the molecular level. Pyrolysis of hybrids at 600 degrees C gave porous silica. Pore size and surface characteristics of these silica gel samples indicated a porous nature with a pore radius of 1.1 nm for silica gels obtained from hybrids HPA-6 (containing no salt) and HPA-9 (containing ZnCl2) and a surface area of 213 m(2)g(-1) and 310 m(2)g(-1), respectively. Silica gel from hybrid HPA-7 (containing LiCl) had a pore radius of 1.9 nm and a surface area of 15 m(2)g(-1). The silica gel samples obtained from hybrids HPA-6, HPA-7 and HPA-9 exhibited narrow slit-like pores with a pore volume of 0.68 cm(3)g(-1).
SPRINGER VERLAG, 1997年05月, POLYMER BULLETIN, 38 (5), 501 - 508, 英語[査読有り]
研究論文(学術雑誌)
[査読有り]
研究論文(学術雑誌)
Gold colloids were prepared from aqueous HAuCl4 solutions ranging in concentration from 0.01 to 0.05 wt% by reducing with sodium citrate and dispersed in a monolithic disk, with 35 mm diameter and 1 mm thickness, by the sol-gel method. Tetramethoxysilane is the only useful reagent as Si source. The particle size of dispersed gold colloids was about 50 nm. This silica gel had a third-order optical non-linearity and its susceptibility, chi(3), was about 7 x 10(-12) esu.
ELSEVIER SCIENCE BV, 1994年05月, JOURNAL OF NON-CRYSTALLINE SOLIDS, 170 (1), 105 - 108, 英語[査読有り]
[招待有り]
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A proton-conducting solid electrolyte membrane based on polyvinyl phosphonic acid (PVPA) and 3-glycidoxypropyltrimethoxysilane was developed via the sol-gel process. The electrical conductivity of the organically modified membrane obtained with optimum composition was 3.7 × 10-2 S/cm at 80°C under 90% relative humidity (RH), which was sufficient for its practical use as a solid electrolyte for fuel cells. In addition, a membrane based on polyphosphoric acid (PPA) and alkoxysilane was fabricated for comparison, by employing polyethylene glycol dimethacrylate (PDM) as an additive. Although the PPA system (with PDM) exhibited similar electrical conductivity to the PVPA system, the latter had superior mechanical strength and flexibility. Furthermore, the PVPA-based membrane with optimum composition was thermally stable up to ca. 200°C. The membrane exhibited electrical conductivity of 1.3 × 10-2 S/cm at 125°C even under 30% RH, which was similar to that of Nafion® at the same temperature under 100% RH. © 2008 Elsevier Ltd. All rights reserved.
2008年04月, Fuel Cells Bulletin, 2008 (4), 12 - 16記事・総説・解説・論説等(学術雑誌)
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口頭発表(一般)
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ポスター発表
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ポスター発表
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口頭発表(一般)
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口頭発表(一般)
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口頭発表(一般)
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口頭発表(一般)
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口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
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口頭発表(一般)
ポスター発表
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口頭発表(一般)
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口頭発表(一般)
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口頭発表(一般)
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ポスター発表
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口頭発表(一般)
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口頭発表(招待・特別)
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口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
ポスター発表
口頭発表(一般)
[招待有り]
口頭発表(招待・特別)
ポスター発表
ポスター発表
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
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口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
ポスター発表
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
ポスター発表
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
[招待有り]
口頭発表(招待・特別)
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
口頭発表(一般)
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競争的資金
競争的資金
競争的資金
シリカ-ポリヒドロキシウレタン樹脂組成物及び有機無機ハイブリッド膜
特願2014-135144, 2014年06月30日, 大学長, 特許6374236, 2018年07月27日特許権
シロキサン樹脂組成物
特願2017-109034, 2017年06月01日, 特許6770779, 2020年09月30日特許権
シロキサン樹脂組成物
特願2015-245072, 2015年12月16日, 特許6529036, 2019年05月24日特許権
酸性ガス含有ガス処理用分離膜、及び酸性ガス含有ガス処理用分離膜の製造方法
特願2017-555008, 特許6457659, 2018年12月28日特許権
ポリカーボネート樹脂用コーティング組成物及びコーティング物
特願2014-64475, 特許6298678特許権
二酸化炭素分離膜
特願2016-19470, 特許6177360特許権