Updated on 2025/10/02

写真a

 
nagasawa tsuyoshi
 
Organization
School of Engineering Associate Professor
Title
Associate Professor
External link

News & Topics

Research Interests

  • After-Treatment System for Automotive Emission

  • Internal Combustion Engine

  • Solid Oxide Fuel Cell

  • Energy Conversion

  • Combustion Synthesis

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Catalyst and resource chemical process

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Chemical reaction and process system engineering

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Fluid engineering

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Thermal engineering

Education

  • Tokyo Institute of Technology

    2013.4 - 2018.3

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    Country: Japan

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  • Georgia Institute of Technology

    2015.9 - 2015.11

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    Country: United States

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  • Tokyo Institute of Technology

    2009.4 - 2013.3

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    Country: Japan

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Research History

  • Institute of Science Tokyo   School of Engineering, Department of Mechanical Engineering   Associate Professor

    2024.10

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    Country:Japan

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  • Tokyo Institute of Technology   School of Engineering, Department of Mechanical Engineering   Associate Professor

    2024.4 - 2024.9

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    Country:Japan

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  • Tokyo Institute of Technology   Assistant Professor

    2018.4 - 2024.3

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  • 日本学術振興会特別研究員DC2

    2016.4 - 2018.3

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Papers

  • Simple Electronic Descriptor for Predicting the Catalytic Activity of Ammonia Synthesis and Decomposition Reviewed

    Yeongjun Yoon, Tsuyoshi Nagasawa, Kyeounghak Kim

    Korean Journal of Chemical Engineering   2025.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s11814-025-00397-1

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    Other Link: https://link.springer.com/article/10.1007/s11814-025-00397-1/fulltext.html

  • Effect of flame temperature on structure and CO oxidation properties of Pt/CeO2 catalyst by flame-assisted spray pyrolysis Reviewed

    Naoya Minegishi, Peizhou Li, Tsuyoshi Nagasawa, Hidenori Kosaka

    Applications in Energy and Combustion Science   20   100303   2024.11

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jaecs.2024.100303

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  • Visualization of oxide ion incorporation in CO2 electrolysis on LSCM-based cathodes of solid oxide electrolysis cell Reviewed

    Kodai Takahashi, Tsuyoshi Nagasawa, Merika Chanthanumataporn, Katsunori Hanamura

    Journal of Power Sources   595   234073   2024.1

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    Authorship:Corresponding author  

    DOI: 10.1016/j.jpowsour.2024.234073

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  • Mechanistic study of oxygen reduction reaction on a Pd/CeO2-ZrO2 catalyst Reviewed

    Hyo Min You, Tsuyoshi Nagasawa, Jae Woo Lee, Hyunguk Kwon, Kyeounghak Kim

    Applied Surface Science   648   159045   2023.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.apsusc.2023.159045

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  • Three-dimensional numerical simulation of oxygen isotope transport in lanthanum strontium manganese - Yttria-stabilized zirconia cathode of solid oxide fuel cell Reviewed

    Takaaki Shimura, Tsuyoshi Nagasawa, Naoki Shikazono, Katsunori Hanamura

    International Journal of Hydrogen Energy   48 ( 50 )   19233 - 19247   2023.2

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.ijhydene.2023.01.349

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  • Effects of Diesel Injector Nozzle Hole Deposit on Fuel Injection and Spray Characteristics Reviewed

    Athiwat Butmarasri, Tsuyoshi Nagasawa, Hidenori Kosaka

    International Journal of Automotive Engineering   13 ( 4 )   177 - 187   2022.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Society of Automotive Engineers of Japan, Inc.  

    DOI: 10.20485/jsaeijae.13.4_177

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  • Visualization of oxygen storage process in Pd/CeO2-ZrO2 three-way catalyst based on isotope quenching technique Reviewed

    Tsuyoshi Nagasawa, Atsushi Kobayashi, Susumu Sato, Hidenori Kosaka, Kyeounghak Kim, Hyo Min You, Katsunori Hanamura, Ami Terada, Takao Mishima

    Chemical Engineering Journal   453 ( 2 )   139937   2022.10

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.cej.2022.139937

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  • Structural Characterization of Ceria-Supported Pt Nanoparticles by Flame-Assisted Spray Pyrolysis Using a Burner Diffusion Flame Reviewed

    Tsuyoshi Nagasawa, Kai Matsumoto, Naoya Minegishi, Hidenori Kosaka

    Energy and Fuels   35 ( 15 )   12380 - 12391   2021.7

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

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  • Distribution of Reaction Sites in SOFC Cathode through Oxygen Isotope Labeling with Three-dimensional Microstructural Analysis Reviewed

    Tsuyoshi Nagasawa, Takaaki Shimura, Naoki Shikazono, Katsunori Hanamura

    Journal of The Electrochemical Society   168 ( 6 )   064506   2021.6

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  • 壁面衝突する噴霧火炎と非燃焼燃料蒸発噴霧の局所熱伝達に及ぼす雰囲気条件と燃料噴射条件の影響 Reviewed

    鄭 載勳, 佐藤 進, 長澤 剛, 小酒 英範

    日本機械学会論文集   86 ( 892 )   20-00274   2020.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

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  • Study on Effect of Nozzle Hole Length to Diameter Ratio on Near-Field Diesel Spray Characteristics at High Density Conditions Reviewed

    Dittapoom Shinabuth, Tsuyoshi Nagasawa, Susumu Sato, Hidenori Kosaka

    International Journal of Automotive Engineering   11 ( 4 )   20204573   2020.11

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  • SIエンジンにおける空気過剰率および筒内水噴射が壁面熱伝達に与える影響 Reviewed

    長澤 剛, 木村 岳, 神戸 聡一, 大倉 優一, 佐藤 進, 小酒 英範

    自動車技術会論文集   51 ( 5 )   739 - 746   2020.8

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  • 希薄燃焼SIエンジンにおける筒内水噴射方向が燃焼特性に与える影響 Reviewed

    長澤 剛, 神戸 聡一, 木村 岳, 佐藤 進, 小酒 英範

    自動車技術会論文集   51 ( 5 )   747 - 753   2020.8

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  • Thermal efficiency improvement of super-lean burn spark ignition engine by stratified water insulation on piston top surface Reviewed

    Tsuyoshi Nagasawa, Yuichi Okura, Ryota Yamada, Susumu Sato, Hidenori Kosaka, Takeshi Yokomori, Norimasa Iida

    International Journal of Engine Research   22 ( 5 )   1421 - 1439   2020.4

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

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  • Investigation on Effect of Offset Orifice Nozzle under Multi Pulse Ultrahigh Pressure Injection and PPC Combustion Conditions Reviewed

    Pop-Paul Ewphun, Miku Otake, Tsuyoshi Nagasawa, Hidenori Kosaka, Susumu Sato

    International Journal of Automotive Engineering   11 ( 1 )   20204127   2020.2

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    Language:English   Publishing type:Research paper (scientific journal)  

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  • Combustion Characteristics of Offset Orifice Nozzle under Multi Pulse Ultrahigh Pressure Injection and PCCI Combustion Conditions Reviewed

    Pop-Paul Ewphun, Miku Otake, Tsuyoshi Nagasawa, Hidenori Kosaka, Susumu Sato

    SAE International Journal of Advances and Current Practices in Mobility   2 ( 2 )   1002 - 1012   2020.1

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  • Effect of injection pressure and ambient density on spray characteristics of diesel and biodiesel surrogate fuels Reviewed

    Meshack Hawi, Hidenori Kosaka, Susumu Sato, Tsuyoshi Nagasawa, Ahmed Elwardany, Mahmoud Ahmed

    Fuel   254   115674   2019.6

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  • Direct Visualization of Oxygen Incorporation for Oxygen Reduction on Porous Mixed-Conducting LaSrCoO3 Cathode Reviewed

    Merika Chanthanumataporn, Tsuyoshi Nagasawa, Katsunori Hanamura

    Journal of The Electrochemical Society   166 ( 10 )   F581 - F586   2019.3

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  • Investigation of oxide ion flux at cathode/electrolyte interface in solid oxide fuel cell Reviewed

    Tsuyoshi Nagasawa, Katsunori Hanamura

    Journal of Power Sources   412   695 - 700   2018.12

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  • Microstructure-scaled active sites imaging of a solid oxide fuel cell composite cathode Reviewed

    Tsuyoshi Nagasawa, Katsunori Hanamura

    Journal of Power Sources   367   57 - 62   2017.9

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  • Prediction of overpotential and effective thickness of Ni/YSZ anode for solid oxide fuel cell by improved species territory adsorption model Reviewed

    Tsuyoshi Nagasawa, Katsunori Hanamura

    Journal of Power Sources   353   115 - 122   2017.4

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  • In situ Raman spectroscopic analysis of the coking resistance mechanism on SrZr0.95Y0.05O3-x surface for solid oxide fuel cell anodes Reviewed

    Tsuyoshi Nagasawa, Dongchang Chen, Samson Yuxiu Lai, Meilin Liu, Katsunori Hanamura

    Journal of Power Sources   324   282 - 287   2016.5

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  • Surface reaction controlling hydrogen permeation through lanthanum-doped ceria membrane with asymmetric structure Reviewed

    Masaru Kanie, Warit Ua-Amnueychai, Merika Chanthanumataporn, Keiji Asada, Tsuyoshi Nagasawa, Katsunori Hanamura

    Mechanical Engineering Letters   1   15-00359   2015.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    A thin membrane (thickness = ~10 µm) made of a lanthanum highly-doped cerium oxide (La0.5Ce0.5O2-δ, LDC) was fabricated on a mixed porous layer consisting of Ni and the LDC. Comparing the results of permeation experiments for hydrogen and helium gases confirmed that the asymmetric membrane acted as a mixed protonic and electronic conducting hydrogen separation membrane and that the thin LDC membrane was an almost dense layer. The most striking result of the permeation experiments was that the hydrogen permeation flux increased with increase in the crystal grain boundary length per unit area of the surface and increased in proportion to the square root of hydrogen partial pressure, showing that the flux is controlled by a surface reaction between the adsorbed hydrogen and proton at the crystal grain boundary.

    DOI: 10.1299/mel.15-00359

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  • Theoretical analysis of hydrogen oxidation reaction in solid oxide fuel cell anode based on species territory adsorption model Reviewed

    Tsuyoshi Nagasawa, Katsunori Hanamura

    Journal of Power Sources   290   168 - 182   2015.5

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  • Power generation characteristics of a SOFC with a Ni/YSZ anode incorporating a SrZr0.95Y0.05O3-α proton conductor Reviewed

    Tsuyoshi Nagasawa, Katsunori Hanamura

    Journal of Thermal Science and Technology   10 ( 1 )   15-00112   2015.4

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers and The Heat Transfer Society of Japan  

    In order to improve the performance and stability of anodes for solid oxide fuel cells (SOFCs) under low hydrogen concentration conditions, SrZr0.95Y0.05O3-α (SZY) proton conductor particles were incorporated into the conventional Ni/YSZ anode. Power generation experiments were conducted using the electrolyte-supported single cells with conventional Ni/YSZ and Ni/YSZ-5%SZY anodes. Enhanced output power density under low hydrogen partial pressure conditions was achieved with the modified anode. This enhancement is ascribed to a decline in the anode overpotential of the Ni/YSZ-5%SZY anode, estimated from impedance spectra, compared to that of the conventional Ni/YSZ anode. In addition, the amount of hydrogen adsorption on Ni, YSZ, and SZY was measured using thermal desorption spectroscopy (TDS). This revealed that the proton conductor SZY could adsorb a large amount of hydrogen compared with YSZ. Consequently, the SZY proton conductor may play an important role in the supply/storage of adsorbed hydrogen, or in increasing the oxidation resistance of Ni under low hydrogen concentration conditions.

    DOI: 10.1299/jtst.2015jtst0011

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MISC

  • 同位体イメージングによる排ガス浄化三元触媒の酸素吸蔵可視化と解析 Invited

    長澤 剛

    セラミックス   60 ( 10 )   688 - 691   2025.10

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

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  • 火炎合成による排ガス浄化触媒の構造制御と粒子生成機構解明に向けたマルチスケール解析 Invited

    峯岸 直也, 長澤 剛, 小酒 英範

    JSAE Engine Review   15 ( 8 )   2025.9

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  • 火炎合成による担持金属触媒の創成と構造制御 Invited

    長澤 剛

    日本機械学会熱工学部門ニュースレター   105   9 - 15   2025.4

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  • COMODIA2025開催のご案内 Invited

    森吉 泰生, 長澤 剛

    日本機械学会エンジンシステム部門ニュースレター   73   1 - 2   2025.3

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    Language:Japanese   Publishing type:Meeting report  

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  • レポート:第34回内燃機関シンポジウム,排気・燃焼生成物・後処理2 Invited

    長澤 剛

    JSAE Engine Review   14 ( 1 )   2024.2

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  • 層状水蒸気遮熱による超希薄燃焼ガソリンエンジンの熱効率向上 Invited

    長澤 剛, 小酒 英範

    自動車技術   77 ( 12 )   52 - 57   2023.12

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  • 水噴射を巧みに操り超希薄燃焼ガソリンエンジンの熱効率を大幅アップ Invited

    長澤 剛, 小酒 英範

    日本機械学会誌   125 ( 1245 )   40 - 41   2022.8

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  • 筒内水噴射による超希薄燃焼ガソリンエンジンの熱効率向上技術 -現象解明と最適化に向けた研究- Invited

    長澤 剛, 小酒 英範

    JSAE Engine Review   12 ( 4 )   2022.8

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  • Imaging of Reaction Distribution in SOFC Cathode by Oxygen Isotope Labeling Combined with Three-Dimensional Microstructural Analysis Invited

    Tsuyoshi Nagasawa, Takaaki Shimura, Naoki Shikazono, Katsunori Hanamura

    The Journal of Fuel Cell Technology   21 ( 4 )   13 - 19   2022.4

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

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  • 固体酸化物形燃料電池の電極反応場と三次元微細構造の同時観察技術 Invited

    長澤 剛, 志村 敬彬

    クリーンエネルギー   31 ( 1 )   9 - 14   2022.1

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:日本工業出版  

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  • スーパーリーンバーンと筒内水噴射の融合が示した超高熱効率ガソリンエンジンの可能性 Invited

    長澤 剛, 佐藤 進, 小酒 英範

    JSAE Engine Review   10 ( 4 )   2020.6

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  • 日本伝熱学会奨励賞を受賞して Invited

    長澤 剛

    伝熱   57 ( 240 )   15   2018.7

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Awards

  • 日本機械学会動力エネルギーシステム部門 優秀講演表彰

    2023.11  

    長澤 剛

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  • Outstanding Presentation Award

    2023.5   Society of Automotive Engineers of Japan  

    Tsuyoshi Nagasawa

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  • JSME Medal for Outstanding Paper

    2022.4   The Japan Society of Mechanical Engineers   Thermal efficiency improvement of super-lean burn spark ignition engine by stratified water insulation on piston top surface

    Tsuyoshi Nagasawa, Yuichi Okura, Ryota Yamada, Susumu Sato, Hidenori Kosaka, Takeshi Yokomori, Norimasa Iida

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  • 令和3年度工学院若手奨励賞

    2021.10   東京工業大学  

    長澤 剛

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  • AUTSE Young Scientist Award

    2020   Asian Union of Thermal Science and Engineering  

    Tsuyoshi Nagasawa

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  • 平成30年度手島精一記念研究賞 博士論文賞

    2019.3   東京工業大学  

    長澤 剛

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  • 日本伝熱学会奨励賞

    2018.5   日本伝熱学会  

    長澤 剛

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  • Best Poster Award, 4th UK-Japan Engineering Education League Workshop

    2016.8   UK-Japan Engineering Education League  

    Tsuyoshi Nagasawa

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  • 優秀プレゼンテーション賞,第53回日本伝熱シンポジウム

    2016.5   日本伝熱学会  

    長澤 剛

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  • 武藤栄治賞優秀学生賞

    2013.3   日本設計工学会  

    長澤 剛

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Research Projects

  • マルチスケールその場計測による低温スス酸化反応メカニズムの解明

    Grant number:25K07617  2025.4 - 2029.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    中村 真季, 長澤 剛

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    Grant amount:\4550000 ( Direct Cost: \3500000 、 Indirect Cost:\1050000 )

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  • 薄膜モデル触媒と同位体可視化を用いた高温反応界面の速度論解析補助事業

    2025.4 - 2026.3

    公益財団法人JKA 競輪とオートレースの補助事業(個別研究) 

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    Authorship:Principal investigator 

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  • 乗用車および重量車の合成燃料利用効率の向上とその背反事象の改善に関する技術開発

    2024.4 - 2026.3

    NEDOグリーンイノベーション基金事業 

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  • 気相燃焼合成による担持金属触媒構造の制御と粒子生成機構解明

    2024.4 - 2026.3

    自動車用内燃機関技術研究組合(AICE) 萌芽的研究 

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    Authorship:Principal investigator 

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  • 燃焼場を用いた多様な複合微粒子デザイン基盤の構築補助事業

    2024.4 - 2025.3

    公益財団法人JKA 競輪とオートレースの補助事業(個別研究) 

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  • パターン触媒・電極を用いた高解像同位体可視化に基づく局所速度論パラメータ計測

    2024.1 - 2025.3

    精密測定技術振興財団  精密測定技術振興のための調査・研究事業 

    長澤 剛

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  • 超高解像計測を基盤とする気固界面輸送反応場の革新的モデリング技術創出補助事業

    2023.4 - 2024.3

    公益財団法人JKA  競輪とオートレースの補助事業(個別研究) 

    長澤 剛

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  • 気相燃焼合成による高活性・高耐久な排ガス浄化触媒の創成

    2022.12 - 2024.3

    自動車用内燃機関技術研究組合(AICE)  萌芽的研究 

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  • 気相燃焼合成による多孔質反応場エンジニアリング

    Grant number:22H01413  2022.4 - 2026.3

    日本学術振興会  科学研究費助成事業 基盤研究(B)  基盤研究(B)

    長澤 剛, 小酒 英範

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    Grant amount:\17940000 ( Direct Cost: \13800000 、 Indirect Cost:\4140000 )

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  • Engineering of Porous Reaction Field by Gas-Phase Combustion Synthesis

    Grant number:23K22684  2022.4 - 2026.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Grant amount:\17940000 ( Direct Cost: \13800000 、 Indirect Cost:\4140000 )

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  • 同位体ラベリング計測と逆解析に基づく高温電極・触媒内局所反応速度測定法の開発

    2022.4 - 2023.3

    精密測定技術振興財団  精密測定技術振興のための調査・研究事業 

    長澤 剛

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  • 壁面熱流動・熱伝達複合計測に基づく超希薄燃焼ガソリンエンジンの層状水蒸気遮熱効果の解明

    2021.4 - 2022.3

    第5回テクノバ賞研究助成 

    長澤 剛

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  • 燃焼合成によるナノ粒子三次元構造制御技術の確立と担持金属触媒への応用

    Grant number:20K14665  2020.4 - 2023.3

    日本学術振興会  科学研究費助成事業 若手研究  若手研究

    長澤 剛

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    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

    自動車の排ガス浄化システムや燃料改質の触媒として広く使用される担持金属触媒においては,高温にて耐凝集性を有する構造の実現が望まれる.本研究では気相燃焼合成法を用い,白金/セリアをモデル系として様々な条件においてナノ粒子合成を実施し,粒子構造制御因子の解明と貴金属の凝集を抑制しつつ高い比表面積を有する最適な触媒構造の実現を目指す.
    前駆体溶液を超音波振動で霧化して拡散バーナ火炎中へと供給するタイプの燃焼合成装置を用い(火炎噴霧熱分解法),火炎温度および前駆体濃度が白金/セリアナノ粒子の構造に与える影響を調査した.火炎温度一定で前駆体濃度を変化させたところ,濃度の減少に伴ってセリアの粒径は減少する一方,白金の粒径は大きく影響を受けないことが明らかとなった.また高濃度の前駆体溶液を用いた場合,中空のセリア粒子が多く観察された.次に前駆体濃度一定で火炎温度を変化させたところ,高温条件においては10nm以下の細かい粒子が主に生成され,低温になるにつれて100nm程度の大きい粒子の生成が支配的になる傾向が見られた.これらに加え,低温においては多結晶構造を有するセリア粒子が多く確認され,また白金粒径は低温ほど小さくなることが明らかとなった.以上の結果をもとに,気相反応による粒子生成ルートと液滴からの生成ルートそれぞれにおける白金/セリアナノ粒子生成メカニズムの考察を行った.
    高比表面積,貴金属高分散性が要求される触媒粒子としては,一般に粒径は小さい方が有利となる.そこで上記の結果より微細な粒子が得られる高温火炎を用い,粒子捕集効率の向上および捕集時間の短縮のために流路を改良し,前駆体濃度を増加させた上で,白金/セリア粒子の合成を行った.得られた粒子のBET比表面積は112.4 m2/g,COパルス吸着法による白金比表面積は2.4 m2/g(白金分散度19.7%)であった.

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  • Flame spray pyrolysis of stable composite nanoparticles with high surface area for metal supported catalysts

    Grant number:19K21068  2019.4 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Research Activity Start-up  Grant-in-Aid for Research Activity Start-up

    Nagasawa Tsuyoshi

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    Grant amount:\2990000 ( Direct Cost: \2300000 、 Indirect Cost:\690000 )

    For automotive exhaust after-treatment catalyst, precious metal agglomeration and following deterioration of catalytic conversion efficiency is one of the big problems. In order to stabilize metal phase and prevent agglomeration, here we aim to fabricate composite nanoparticles consisting of precious metal and oxide phases by combustion synthesis method. For particle fabrication, combustion synthesis apparatus with coaxial flow diffusion flame burner with double tube structure was constructed. In CH4/O2 diffusion flame, chemical precursor solution atomized by ultrasonic vibrator is supplied with N2. By using the constructed equipment, Pt/CeO2 nanoparticles were synthesized. From a mixture solution of Ce and Pt precursors, 5wt%-Pt/CeO2 nanoparticles with CeO2 diameter of around 100 nm and Pt of around 10 nm were synthesized. In addition, 3D-structure observation of Pt/CeO2 particles by TEM tomography shows that Pt particles are embedded on CeO2 surface or included inside CeO2 particles.

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  • 多角的光学計測による次世代超希薄燃焼ガソリンエンジン壁面近傍の熱流動現象及び成層水噴射効果の解明

    2019.4 - 2020.3

    マツダ財団  第35回マツダ研究助成 

    長澤 剛

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    Authorship:Principal investigator 

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  • 噴霧燃焼合成による固体酸化物型燃料電池電極の一括成膜技術の開発

    2018.4 - 2019.3

    平成30年度日新製糖奨学育英基金 

    長澤 剛

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    Authorship:Principal investigator 

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  • 同位体クエンチ可視化による固体酸化物型燃料電池電極内の電流密度・過電圧分布定量化

    2018.4 - 2019.3

    服部報公会  平成30年度工学研究奨励援助金 

    長澤 剛

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    Authorship:Principal investigator 

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  • 原子ラベリング・FIB-SEM融合によるSOFC燃料極の3次元イオン分布計測

    Grant number:16J03479  2016.4 - 2018.3

    日本学術振興会  科学研究費助成事業 特別研究員奨励費  特別研究員奨励費

    長澤 剛

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    Grant amount:\2300000 ( Direct Cost: \2300000 )

    本研究は固体酸化物型燃料電池(SOFC)の多孔質電極内反応場分布を,反応のクエンチと同位体ラベリングを用いて明らかにしようとするものである.昨年度までに,ヘリウムガスの衝突噴流によるSOFCのクエンチと酸素同位体ラベリングにより,空気極の反応場分布を電極微構造スケールで取得することに成功している.このため本年度は,同手法を用いてLSM(ランタンストロンチウムマンガナイト)/YSZ(イットリア安定化ジルコニア)空気極内部の反応場をより詳細かつ定量的に調べた.
    酸化物イオンの拡散が速い電解質(YSZ)部分における同位体酸素分布を得るために,発電温度を800℃から700℃へと下げて実験を行った.同位体酸素を用いて700℃において発電を行い,その後ヘリウムガスの衝突噴流によってSOFCを1秒程度でクエンチした.クエンチ後の電解質/空気極界面における断面内同位体酸素分布を高空間分解能の二次イオン質量分析計にて計測した.その結果,空気極/電解質界面近傍でのみLSM粒子内部への同位体酸素拡散が見られたことから,この界面近傍で酸素の化学ポテンシャルが大きく低下していること,すなわち過電圧が増加していることが明らかとなった.また可視化結果から得られたYSZ電解質部分の同位体酸素プロファイルを半無限固体の1次元拡散方程式にて解析し,そこから電解質/空気極界面における酸化物イオンフラックスを定量的に見積もった.その結果,空気極から流れ込む酸化物イオンフラックスのうちの2~3割が電解質/空気極界面から,残りの7~8割が多孔質空気極部分から流入していることが明らかとなった.

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