教育活動

大学院：人間環境学(基礎I)
学部：現代工学基礎Ⅰ，流れ学第一，熱流体工学，機械工学総合演習第一，機械工学総合演習第二，創造設計演習，Mechanical Engineering Seminar I，Mechanical Engineering Seminar II

研究活動

カーボンニュートラルを実現するために必要とされる水素の活用や二酸化炭素回収技術の開発のためには，多孔体材料や高分子材料をはじめとする微細な空間内の流れの理解に基づくデバイス設計が不可欠です．微細な空間では，流体を連続体として扱うことが妥当ではなくなり，分子論的な視点に立って現象を解析する必要が生じます．このような流動現象の理解と制御を目的として，界面近傍における現象の解明とマルチスケール解析手法の構築に取り組んでいます．

◆気液界面における蒸発現象の解明とデバイス応用
　蒸発を伴う流れは自然や工学応用において普遍的にみられる現象であり，植物の蒸散，土壌からの水分の蒸発，淡水化デバイス，半導体素子の冷却などにおいて重要な役割を果たしています．しかし，流れを解析する上で必要となる気液界面の境界条件には未だに様々な議論があり，現象を定量的に予測する際の障壁となっています．我々の研究室では相変化の微視的描像を明らかにすることを目指して，分子線法や非線形分光法を用いた気液界面の計測に取り組んでいます．また，蒸発により気液界面近傍に生じる非平衡性の強い流れを解析するための効率的な数値計算法の構築を進めています．

キーワード: 分子流体力学，希薄気体力学，ボルツマン方程式，分子線



◆固体高分子形燃料電池内の輸送解析
　移動体や定置型発電用途で活用が進められつつある固体高分子形燃料電池ですが，更なる普及のためにはシステムの小型化と低コスト化が求められています．これらの要求を満たすためには高電流密度化（電池の断面積あたりから取り出せる電流を増やすこと）が必要ですが，電流密度が増加すると，電池内部の物質輸送抵抗が発電性能低下の主要因となることが知られています．我々の研究室では，燃料電池を構成する部材のひとつであるカソード触媒層を対象として，触媒層内部の酸素と水の輸送機構を実験と数値シミュレーションにより明らかにし，より高性能な材料を設計するための筋道を示すことを目指しています．

キーワード: 多孔体，クヌッセン拡散，毛管凝縮



◆水電解電極で発生する酸素気泡の脱離挙動の解明
　水素の製造方法のひとつであるアルカリ水電解は，発生した酸素気泡が電極表面から脱離せずに反応を阻害し，電流密度の向上が困難になるという課題があります．一方で，電極から脱離した気泡が電解液を撹拌して反応を促進する効果もあり，水電解装置の効率向上には電極表面での気泡の挙動の理解が不可欠です．本研究では，高速度カメラを用いた気泡挙動の計測と，数値シミュレーションによる流れの解析をあわせて実施することで，気泡が脱離するメカニズムの理解と，電流密度の向上を可能にする電極表面形状の設計指針を得ることを目指しています．

キーワード: 混相流，接触線，ぬれ性，数値流体力学，データ同化



◆高性能CO₂分離膜の気体輸送機構に関する研究
　二酸化炭素の分離，回収には様々な方法が用いられますが，その中でも高分子膜を用いた気体分離膜は，システムの簡便さやコストの観点から，有効な手段になることが期待されています．気体分離膜の性能を表す指標である透過性と選択性にはトレードオフの関係があり，このトレードオフの関係を打破する高性能な分離膜が求められています．我々の研究室では，高分子膜内の二酸化炭素の分離機構を分子シミュレーションにより明らかにし，材料設計への指針を与えることを目指しています．

キーワード: 分子動力学シミュレーション，グランドカノニカルモンテカルロシミュレーション

文献

• Hiroki Imai, Ikuya Kinefuhi, "Pore-scale effect on the non-equilibrium gas flow induced by evaporation from two-dimensional porous surfaces," Physics of Fluids 38 (8), 082002 (2026). (Editor's Pick, Scilight article)
• Yu Saiki, Ikuya Kinefuhi, Yuji Suzuki, "Direct measurement of O-atom adsorption with plasma molecular beam scattering," Journal of Vacuum Science and Technology A 44 (3), 033207 (2026).
• Aoi Watanabe, Ryuhei Sato, Ikuya Kinefuchi, Yasushi Shibuta, "douka: A universal platform of data assimilation for materials modeling," Journal of Chemical Physics 163 (11), 112502 (2025).
• Clint John Cortes Otic, Ikuya Kinefuchi, "Machine Learning-Driven 3D Reconstruction of PEMFC Catalyst Layers from FIB-SEM Imaging," Journal of Power Sources 651, 237556 (2025).
• Clint John Cortes Otic, Shota Katayama, Masazumi Arao, Masashi Matsumoto, Hideto Imai, Ikuya Kinefuchi, "Water Condensation in the Nanoscale Pores of Pt/C Catalyst Particles and Its Impact on Catalyst Utilization: A Simulation Based on a Reconstructed Structure from Nanoimaging," ACS Applied Materials & Interfaces 16 (16), pp. 20375–20390 (2024).
• Huihang Qiu, Keisuke Obata, Zhicheng Yuan, Takeshi Nishimoto, Yaerim Lee, Keisuke Nagato, Ikuya Kinefuchi, Junichiro Shiomi, Kazuhiro Takanabe, "Quantitative description of bubble formation in response to electrolyte engineering," Langmuir 39, pp. 4993–5001 (2023).
• Toshihiro Kaneko, Junpei Ooyama, Maria Ohki, Hiroyuki Kanesaka, Yuta Yoshimoto, Ikuya Kinefuchi, "Effect of ionomer swelling and capillary condensation of water on porous characteristics in cathode catalyst layers of polymer electrolyte membrane fuel cells under humidified conditions," International Journal of Heat and Mass Transfer 200, 123491 (2022).
• Yuta Yoshimoto, Yuiko Tomita, Kohei Sato, Shiori Higashi, Masafumi Yamato, Shu Takagi, Hiroyoshi Kawakami, Ikuya Kinefuchi, "Gas Adsorption and Diffusion Behaviors in Interfacial Systems Composed of a Polymer of Intrinsic Microporosity and Amorphous Silica: A Molecular Simulation Study," Langmuir 38 (24), pp. 7567–7579 (2022).
• Ahmet Alperen Gunay, Sivasankaran Harish, Masanori Fuchi, Ikuya Kinefuchi, Yaerim Lee, Junichiro Shiomi, "Metal-Organic Framework Coated Porous Structures for Enhanced Thermoelectric Performance," Energy Conversion and Management 255, 115289 (2022).
• Soichiro Shimotori, Toshihiro Kaneko, Yuta Yoshimoto, Ikuya Kinefuchi, Amer Alizadeh, Wei-Lun Hsu, Hirofumi Daiguji, "Evaluation of gas permeability in porous separators for polymer electrolyte fuel cells: CFD simulation based on micro X-ray computed tomography images," Physical Review E 104, 045105 (2021).
• Yuta Yoshimoto, Sou Sugiyama, Shuntaro Shimada, Toshihiro Kaneko, Shu Takagi, Ikuya Kinefuchi, "Molecular Insight into the Mechanical Properties of Polymer–Fullerene Bulk Heterojunctions for Organic Photovoltaic Applications," Macromolecules 54 (2), pp. 958–969 (2021).
• Chihiro Kamijima, Yuta Yoshimoto, Yutaro Abe, Shu Takagi, Ikuya Kinefuchi, "Relating the thermal properties of a micro pulsating heat pipe to the internal flow characteristics via experiments, image recognition of flow patterns and heat transfer simulations," International Journal of Heat and Mass Transfer 163, 120415 (2020).
• Daniel F. Hanks, Zhengmao Lu, Jay Sircar, Ikuya Kinefuchi, Kevin R. Bagnall, Todd R. Salamon, Dion S. Antao, Banafsheh Barabadi, Evelyn N. Wang, "High Heat Flux Evaporation of Low Surface Tension Liquids from Nanoporous Membranes," ACS Applied Materials & Interfaces 12 (6), pp. 7232–7238 (2020).
• Toshihiro Kaneko, Yuta Yoshimoto, Takuma Hori, Shu Takagi, Junpei Ooyama, Takeshi Terao, Ikuya Kinefuchi, "Relation between oxygen gas diffusivity and porous characteristics under capillary condensation of water in cathode catalyst layers of polymer electrolyte membrane fuel cells," International Journal of Heat and Mass Transfer 150, 119277 (2020).
• Zhengmao Lu, Ikuya Kinefuchi, Kyle Wilke, Geoff Vaartstra, Evelyn Wang, "A Unified Relationship for Evaporation Kinetics at Low Mach Numbers," Nature Communications 10, 2368 (2019).
• Yuta Yoshimoto, Koichi Isomura, Sou Sugiyama, Hua An, Takuma Hori, Taiki Inoue, Shohei Chiashi, Shu Takagi, Shigeo Maruyama, Ikuya Kinefuchi, "In situ observation of dewetting-induced deformation of vertically aligned single-walled carbon nanotubes," Diamond and Related Materials 95, pp. 115–120 (2019). (selected for cover image)
• Masataka Nakauchi, Takuya Mabuchi, Yuta Yoshimoto, Takuma Hori, Ikuya Kinefuchi, Hideki Takeuchi, Takashi Tokumasu, "A Molecular Dynamics Study of Oxygen Scattering Behavior on Perfluorosulfonic Acid Ionomer Thin Films," Journal of Physical Chemistry C 123 (12), pp. 7125–7133 (2019).
• Yu Saiki, Ikuya Kinefuchi, Yong Fan, Yuji Suzuki, "Evaluation of H-atom adsorption on wall surfaces with a plasma molecular beam scattering technique," Proceedings of the Combustion Institute 37 (4), pp. 5569–5576 (2019).
• 木原 玄悟, 吉本 勇太, 堀 琢磨, 高木 周, 杵淵 郁也, "非マルコフ散逸粒子動力学に基づく水の粗視化モデルの構築," 日本機械学会論文集 84巻865号, 18-00193 (2018).
• 吉本 勇太, 杵淵 郁也, "Mori-Zwanzig射影演算子法及びiterative Boltzmann inversion法に基づく非マルコフ粗視化モデルの構築," アンサンブル 20 (20), pp. 119–125 (2018).
• Takuma Hori, Takafumi Kamino, Yuta Yoshimoto, Shu Takagi, Ikuya Kinefuchi, "Mutual influence of molecular diffusion in gas and surface phases," Physical Review E 97 (1), 013101 (2018).
• Yuta Yoshimoto, Zhen Li, Ikuya Kinefuchi, George Karniadakis, "Construction of non-Markovian coarse-grained models employing the Mori-Zwanzig formalism and iterative Boltzmann inversion," Journal of Chemical Physics 147 (24), 244110 (2017).
• Yuta Yoshimoto, Takuma Hori, Ikuya Kinefuchi, Shu Takagi, "Effect of capillary condensation on gas transport properties in porous media," Physical Review E 96 (4), 043112 (2017).
• Zhengmao Lu, Kyle L Wilke, Daniel J. Preston, Ikuya Kinefuchi, Elizabeth Chang-Davidson, Evelyn N. Wang, "An Ultra-Thin Nanoporous Membrane Evaporator," Nano Letters 17 (10), pp. 6217–6220 (2017).
• Ikuya Kinefuchi, Yusuke Kotsubo, Kenichi Osuka, Yuta Yoshimoto, Nobuya Miyoshi, Shu Takagi, Yoichiro Matsumoto, "Incident energy dependence of the scattering dynamics of water molecules on silicon and graphite surfaces: The effect on tangential momentum accommodation," Microfluidics and Nanofluidics 21 (2), 15 (2017).
• Yuta Yoshimoto, Kenichi Osuka, Nobuya Miyoshi, Ikuya Kinefuchi, Shu Takagi, Yoichiro Matsumoto, "Hyperthermal molecular beam source using a non-diaphragm-type small shock tube," Review of Scientific Instruments 87 (10), 105117 (2016).
• Akinori Fukushima, Toshiki Mima, Ikuya Kinefuchi, Takashi Tokumasu, "Channel Size Dependence of the Friction Coefficient Between a Water Droplet and a Nanochannel Wall by Molecular Dynamics Simulation," Journal of Physical Chemistry C 119 (51), pp. 28396–28404 (2015).
• Akinori Fukushima, Toshiki Mima, Ikuya Kinefuchi, Takashi Tokumasu, "Molecular Dynamics Study for Channel Size Dependence of Shear Stress Between Droplet and Wall," Journal of Nanoscience and Nanotechnology 15 (4), pp. 3224–3228 (2015).
• Gota Kikugawa, Taku Ohara, Tohru Kawaguchi, Ikuya Kinefuchi, Yoichiro Matsumoto, "A Molecular Dynamics Study on Heat Conduction Characteristics inside the Alkanethiolate SAM and Alkane Liquid," International Journal of Heat and Mass Transfer 78, pp. 630–635 (2014).
• Gota Kikugawa, Taku Ohara, Tohru Kawaguchi, Ikuya Kinefuchi, Yoichiro Matsumoto, "A Molecular Dynamics Study on Heat Transfer Characteristics over the Interface of Self-Assembled Monolayer and Water Solvent," ASME Journal of Heat Transfer 136 (10), 102401 (2014).
• Nobuya Miyoshi, Kenichi Osuka, Ikuya Kinefuchi, Shu Takagi, Yoichiro Matsumoto, "Molecular Beam Study of the Scattering Behavior of Water Molecules from a Graphite Surface," Journal of Physical Chemistry A 118 (26), pp. 4611–4619 (2014).
• Yuta Yoshimoto, Ikuya Kinefuchi, Toshiki Mima, Akinori Fukushima, Takashi Tokumasu, Shu Takagi, "Bottom-up construction of interaction models of non-Markovian dissipative particle dynamics," Physical Review E 88 (4), 043305 (2013).
• Yuta Yoshimoto, Kenichi Osuka, Nobuya Miyoshi, Ikuya Kinefuchi, Shu Takagi, Yoichiro Matsumoto, "A non-diaphragm type small shock tube for application to a molecular beam source," Review of Scientific Instruments 84 (7), 075105 (2013).
• Ikuya Kinefuchi, Junichiro Shiomi, Shu Takagi, Shigeo Maruyama, Yoichiro Matsumoto, "Gas-Surface Energy Exchange in Collisions of Helium Atoms with Aligned Single-Walled Carbon Nanotube Arrays," Journal of Physical Chemistry C 117 (27), pp. 14254–14260 (2013).
• Mitsuhisa Ichiyanagi, Ryoji Miyazaki, Toshiyuki Ogasawara, Ikuya Kinefuchi, Yoichiro Matsumoto, Shu Takagi, "Measurements of microbubble generation process in microchannel using ultra high-speed micro-PTV system," Microfluidics and Nanofluidics 14 (6), pp. 1011–1020 (2013).
• Nobuya Miyoshi, Kenichi Osuka, Yuta Yoshimoto, Ikuya Kinefuchi, Shu Takagi, Yoichiro Matsumoto, "Development of High-Energy Molecular Beam Source Using Small Shock Tube," Transactions of the JSME (in Japanese) 79 (798), pp. 140–147 (2013).
• Toru Kawaguchi, Gota Kikugawa, Ikuya Kinefuchi, Shinichi Yatsuzuka, Taku Ohara, Yoichiro Matsumoto, "Interfacial Thermal Resistance of Hydrophilically-Terminated Self-Assembled Monolayer and Water: A Molecular Dynamics Study," Transactions of the Japan Society of Mechanical Engineers C (in Japanese) 76 (768), pp. 1936–1938 (2010).
• Jumpei Kawasaki, Yushi Harada, Ikuya Kinefuchi, Kei Ishikawa, Junichiro Shiomi, Shu Takagi, Shigeo Maruyama, Yoichiro Matsumoto, "Scattering Process of Transmitted Gas Molecules Through Vertically Aligned Single-Walled Carbon Nanotube Arrays," Transactions of the Japan Society of Mechanical Engineers C (in Japanese) 76 (768), pp. 1933–1935 (2010).
• Yoichiro Matsumoto, Ikuya Kinefuchi, "Scattering of Gas Molecules on Solid Surfaces," Nagare (in Japanese) 28 (3), pp. 225–231 (2009).
• Ikuya Kinefuchi, Hiroki Yamaguchi, Yukinori Sakiyama, Shu Takagi, Yoichiro Matsumoto, "Inhomogeneous Decomposition of Ultrathin Oxide Films on Si(100): Application of Avrami Kinetics to Thermal Desorption Spectra," Journal of Chemical Physics 128 (16), 164712 (2008).
• Ikuya Kinefuchi, Hiroki Yamaguchi, Yukinori Sakiyama, Shu Takagi, Yoichiro Matsumoto, "Thermal Decomposition Process of Ultrathin Oxide Layers on Si(100)," Journal of The Surface Science Society of Japan (in Japanese) 29 (9), pp. 537–542 (2008).
• Ikuya Kinefuchi, Akira Ito, Hiroki Yamaguchi, Yukinori Sakiyama, Yoichiro Matsumoto, "Oxidation Dynamics of Si(100) Surface with O2 Molecular Beam," Thermal Science and Engineering 13 (4), pp. 73–76 (2005).

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