Updated on 2025/09/30

写真a

 
OHKUBO Takahiro
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Professor
Position
Professor
External link

Degree

  • Doctor(Science) ( 2003.3   Chiba University )

Research Interests

  • Metal Complex

  • Adsorption

  • XAFS

  • Boron Nitride

  • Nanopore

  • Carbon Material

  • Hydration

Research Areas

  • Nanotechnology/Materials / Fundamental physical chemistry

  • Nanotechnology/Materials / Inorganic/coordination chemistry

  • Nanotechnology/Materials / Nanometer-scale chemistry

  • Nanotechnology/Materials / Inorganic compounds and inorganic materials chemistry

  • Nanotechnology/Materials / Nanomaterials

  • Nanotechnology/Materials / Composite materials and interfaces

  • Nanotechnology/Materials / Functional solid state chemistry

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Education

  • Chiba University   大学院自然科学研究科  

    1998.4 - 2003.3

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    Country: Japan

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  • Chiba University   理学部   化学科

    1994.4 - 1998.3

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    Country: Japan

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Research History

  • Okayama University   Faculty of Environmental, Life, Natural Science and Technology   Professor

    2023.4

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    Country:Japan

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  • Okayama University   Faculty of Natural Science and Technology   Associate Professor

    2021.4 - 2023.3

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    Country:Japan

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  • Okayama University   Graduate School of Natural Science and Technology   Associate Professor

    2007.4 - 2021.3

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    Country:Japan

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  • Tokyo University of Science   Research Institute on Science and Technology   Assistant Professor

    2004.4 - 2007.3

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  • Oita University   Faculty of Science and Technology

    2022.10 - 2023.3

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  • Kyushu University   Institute for Materials Chemistry and Engineering   Visiting Associate Professor

    2016.10 - 2017.3

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  • Japan Society for Promotion of Science   Australia-Japan Emerging Research Leaders Exchange Program   Visiting Researcher

    2012.2 - 2012.3

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  • Tokyo University of Science   Visiting Associate Professor

    2007.5 - 2008.3

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  • University of Queensland   Visiting Researcher

    2006.1 - 2006.3

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  • Japan Society for Promotion of Science   Young Research Fellow

    2002.4 - 2004.3

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Professional Memberships

  • International Adsorption Society

    2020.11

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  • THE CHEMICAL SOCIETY OF JAPAN

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  • Division of Colloid and Interface Science, The Chemical Society of Japan

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  • THE CARBON SOCIETY OF JAPAN

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  • American Chemical Society

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  • The Japan Society of Adsorption

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  • The Society of Iodine Science

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  • JAPAN OIL CHEMISTS' SOCIETY

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  • Japan Research Institute of Material Technology

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  • The Surfece Science Society of Japan

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Committee Memberships

  • 日本吸着学会   理事  

    2025.4   

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    Committee type:Academic society

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  • 日本化学会コロイドおよび界面化学部会   賞選考委員会副委員長  

    2025.3   

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    Committee type:Academic society

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  • 日本化学会コロイドおよび界面化学部会   討論会委員会 委員長  

    2025.3   

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    Committee type:Academic society

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  • 日本化学会 中国四国支部   化学教育協議会委員  

    2024.3   

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    Committee type:Academic society

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  • 日本化学会 中国四国支部   幹事  

    2024.3   

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    Committee type:Academic society

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  • 日本化学会 コロイドおよび界面化学部会   役員会委員  

    2008.3   

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    Committee type:Academic society

    日本化学会 コロイドおよび界面化学部会

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  • 日本化学会コロイドおよび界面化学部会   財務委員会委員  

    2025.3   

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    Committee type:Academic society

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  • 日本化学会コロイドおよび界面化学部会   将来構想委員会委員  

    2025.3   

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    Committee type:Academic society

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  • 日本化学会コロイドおよび界面化学部会   国際交流委員会委員  

    2025.3   

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    Committee type:Academic society

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  • 日本化学会コロイドおよび界面化学部会   討論会委員会 副委員長  

    2023.3 - 2025.2   

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    Committee type:Academic society

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  • 日本化学会コロイドおよび界面化学部会   事業企画委員会委員  

    2020.3   

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    Committee type:Academic society

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  • 炭素材料学会   次世代の会幹事  

    2015 - 2021.12   

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    Committee type:Academic society

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  • 日本吸着学会   運営委員  

    2015 - 2019   

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    Committee type:Academic society

    日本吸着学会

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  • 日本化学会 コロイドおよび界面化学部会   広報委員  

    2014 - 2022   

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    Committee type:Academic society

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  • 日本化学会 コロイドおよび界面化学部会   国際交流委員  

    2014 - 2016   

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    Committee type:Academic society

    日本化学会 コロイドおよび界面化学部会

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  • 日本吸着学会   第23回吸着シンポジウム(吸着夏の学校)実行委員長  

    2014   

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    Committee type:Academic society

    日本吸着学会

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  • 日本表面科学会   討論会委員  

    2014   

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    Committee type:Academic society

    日本表面科学会

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  • 日本吸着学会   評議委員  

    2013.4 - 2025.3   

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    Committee type:Academic society

    日本吸着学会

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  • 日本化学会 コロイドおよび界面化学部会   若手ワーキンググループ委員(2019-2020:委員長)  

    2012 - 2020   

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    Committee type:Academic society

    日本化学会 コロイドおよび界面化学部会

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  • 日本吸着学会   編集委員  

    2009 - 2012   

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    Committee type:Academic society

    日本吸着学会

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Papers

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Books

  • Research, Development, and Applications of Carbon Nanotubes

    Shinji Kawasaki( Role: Contributor)

    2025.2  ( ISBN:9784781318615

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  • 吸着技術の産業応用~基礎知識・吸着剤の特性・技術応用事例~

    大久保貴広( Role: Contributor ,  第1章 液相吸着現象)

    情報機構  2023.2  ( ISBN:9784865022445

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  • Synthesis and applications of porous carbon materials

    ( Role: Contributor)

    2019.10  ( ISBN:9784781314419

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    Total pages:vi, 206p   Language:Japanese

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  • CO2の分離・回収・貯留の最新技術

    西尾, 匡弘( Role: Contributor ,  第2編 第4章 第2節「極低圧領域での選択的CO2吸着材の開発」(織田晃,大久保貴広,黒田泰重))

    エヌ・ティー・エス  2022.4  ( ISBN:9784860437718

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    Total pages:2, 6, 329, 8p, 図版20p   Language:Japanese

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  • XAFS/EELSによる局所構造解析・状態解析技術

    ( Role: Contributor ,  第4章第9節「カーボンナノチューブ細孔内に吸着した水和錯体のXAFSによる構造解析」)

    情報機構  2014.9  ( ISBN:9784865020717

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  • 機械的処理による分散技術

    技術情報協会  2009 

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  • 機能性微粒子とナノマテリアルの開発―材料設計のためのナノテクノロジー (フロンティアテクノシリーズ)

    小石, 真純( Role: Contributor ,  第4章「ナノ細孔体の機能と新規細孔性材料の設計」(大久保貴広,加納博文,金子克美))

    フロンティア出版  2004.5  ( ISBN:4902410028

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    Total pages:301   Language:Japanese

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MISC

  • Outside Front Cover

    Journal of Colloid and Interface Science   630   OFC - OFC   2023.1

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    Language:English   Publisher:Elsevier BV  

    DOI: 10.1016/s0021-9797(22)01949-x

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  • New Evolution of Boron Nitride from the Viewpoint of Gas Adsorption Characteristics Invited Reviewed

    Takahiro Ohkubo

    7 ( 2 )   58 - 66   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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  • 窒化ホウ素細孔体のガス吸着特性 Invited

    大久保貴広

    Fine Ceramics Report   40 ( 1 )   6 - 10   2022.1

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:日本ファインセラミックス協会  

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    Other Link: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19K05650/

  • 単層カーボンナノチューブを反応容器として使う―ナノ制約銅錯体の可視光還元反応― Reviewed

    大久保貴広

    材料表面   2 ( 2 )   64 - 71   2017

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  • Group of Inorganic Chemistry, Department of Chemistry, Shool of Science, Okayama University Invited

    Takahiro Ohkubo

    Oleoscience   24 ( 6 )   276 - 277   2024.6

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

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  • Self-growth of silver tree-like fractal structures and their surface-enhanced Raman application Invited

    Nobuyuki Takeyasu, Jun Kano, Takahiro Ohkubo, Toshihiko Kiwa, Qingyuan Ma, Satoru Shoji

    Photonics NEWS   9 ( 2 )   83 - 87   2023.12

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

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  • Production of the Unprecedented M2+ and [M-M]2+ (M=Zn and Cd) Species by Utilizing the Sub-nano-sized Zeolite Space and Structural Analysis for the Formation Site Reviewed

    Ohkubo Takahiro, Oda Akira, Kuroda Yasushige

    SPring-8/SACLA Research Report   11 ( 1 )   10 - 14   2023.2

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Rapid communication, short report, research note, etc. (bulletin of university, research institution)   Publisher:Japan Synchrotron Radiation Research Institute  

    DOI: 10.18957/rr.11.1.10

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  • Selective Collection of Xe under Low Pressure at Room Temperature Driven by the Formation of Ag(I)-Xe Compound Observed in MFI Zeolite Pores

    Zeolite   40 ( 1 )   1 - 8   2023.1

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

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  • XAFS - Analysis of local structure around a selected element -

    Takahiro Ohkubo

    31 ( 3 )   15 - 25   2017

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    Authorship:Lead author, Corresponding author   Language:Japanese  

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  • わこうどの声

    大久保貴広

    炭素   266   52 - 52   2015

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  • 単層カーボンナノチューブ細孔内で見られる特異な光還元反応 Invited

    大久保貴広

    Colloid and Interface Communication   40 ( 1 )   22 - 23   2015

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    Authorship:Lead author, Corresponding author   Language:Japanese  

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  • 酸化グラフェンと酸化スズからなるマクロ孔配列の作製

    後藤良子, 大澤侑史, 田嶋智之, 仁科勇太, 仁科勇太, 西政康, 大久保貴広, 高口豊

    日本化学会講演予稿集   94th ( 3 )   2014

  • 微小サイズの水溶液:ナノ溶液

    大久保貴広

    オレオサイエンス   13   336 - 337   2013

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    Authorship:Lead author, Corresponding author  

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  • Hydration Structure around a Zinc Ion Restricted in Carbon Nanospace

    51 ( 3 )   103 - 114   2013

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    Authorship:Corresponding author   Language:Japanese  

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  • Hydration and coordination structure of d-block metals formed by the confinement effect of carbon micropores Reviewed

    T. Ohkubo

    TANSO   260 ( 260 )   297 - 305   2013

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    Authorship:Lead author, Corresponding author   Language:English   Publisher:THE CARBON SOCIETY OF JAPAN  

    We have studied the structure around a metal ion such as zinc and copper restricted in the micropores of carbon materials with the X-ray absorption fine structure (XAFS) technique and adsorption isotherm analyses. We succeeded in revealing the dehydrated structure of zinc ions confined in the micropores of activated carbon fibers (ACFs) and carbon nanotubes (CNTs) whose pore widths are below 1 nm. XAFS spectra and adsorption isotherms of zinc ions at 303 K strongly indicate that the dehydrated structure can be stably formed even in a micropore whose pore width is less than the diameter of a spherically hydrated zinc ion, where the dehydrated ions can be stabilized by the strong potential well of the carbon micropores. Also, we studied the local structure around a copper ion of copper acetate restricted in the micropore of two kinds of ACFs by the XAFS technique. The results obtained indicate the elongation of the Cu-Cu distance of the dinuclear copper complex because of the distortion or the reduction in the number of bridging carboxylates inside the micropore. We could understand the specific formation of hydration or coordination structure formed in micropores by using d-block elements as probe metal ions.

    DOI: 10.7209/tanso.2013.297

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    Other Link: https://jlc.jst.go.jp/DN/JALC/10026812310?from=CiNii

  • ナノ制約空間中で形成される異常な水溶液構造

    大久保貴広

    Colloid and Interface Communication   38 ( 3 )   54 - 56   2013

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publisher:日本化学会コロイドおよび界面化学部会  

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  • カーボンナノチューブ/フラロデンドロン超分子光増感剤を利用した水素生成

    笹田由香里, 田嶋智之, 西政康, 大久保貴広, 内田哲也, 高口豊

    光化学討論会講演要旨集   2013   2013

  • Unprecedented reversible redox cycle found in the ZnMFI-H_2 system

    TORIGOE Hiroe, ODA Akira, ITADANI Atsushi, OHKUBO Takahiro, YUMURA Takashi, KOBAYASHI Hisayoshi, KURODA Yasushige

    54 ( 2 )   93 - 95   2012.3

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  • Green tea mediated biosynthesis of a-Fe2O3 nano-/ micro -particles and their characterization Reviewed

    B. Ahmmad, J. Kurawaki, T. Ohkubo, Y. Kuroda

    ICNE conference proceeding in World Journal of Engineering   8   19 - 20   2011

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  • 岡山大学理学部化学科 無機化学研究室

    大久保 貴広

    C & I commun : colloid & interface communication : newsletter from DCSC / 日本化学会企画部 編   36 ( 2 )   37 - 39   2011

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    Language:Japanese   Publisher:日本化学会コロイドおよび界面化学部会  

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  • XAFS study of specific methane adsorption at 298 K on CuMFI zeolite

    A. Itadani, M. Tanaka, H. Torigoe, Y. Hirose, T. Ohkubo, Y. Kuroda

    Photon Factory Activity Report 2008   26   44 - 44   2010

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  • Structural informatino of the states of acetylene adsorbed on CuMFI zeolite at 298 K

    A. Itadani, Y. Hirose, H. Torigoe, K. Takahara, T. Ohkubo, Y. Kuroda

    Photon Factory Activity Report 2008   26   22 - 22   2010

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  • Fundamental Understanding of Nanoporous Carbons for Energy Application Potentials Reviewed

    Katsumi Kaneko, Miki Arai, Masahiro Yamamoto, Tomonori Ohba, Jun-Ichi Miyamoto, Dong-Young Kim, Yousheng Tao, Cheol-Min Yang, Kouki Urita, Toshihiko Fujimori, Hideki Tanaka, Takahiro Ohkubo, Shigenori Utsumi, Yoshiyuki Hattori, Takehisa Konishi, Takashi Fujikawa, Hirofumi Kanoh, Masakao Yudasaka, Kenji Hata, Motoo Yumura, Sumio Iijima, Hiroyuki Muramatsu, Takuya Hayashi, Yoong-Ahm Kim, Morinobu Endo

    Carbon letters   10 ( 3 )   177 - 180   2009.9

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    Publisher:Korean Carbon Society  

    DOI: 10.5714/cl.2009.10.3.177

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  • 固体細孔内の電解質水溶液-ナノ溶液-

    大久保貴広

    Adsorption News   23 ( 1 )   3 - 9   2009

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    Authorship:Lead author, Corresponding author  

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  • ナノ制約環境下における電解質溶液の構造特性

    大久保貴広

    NEWSLETTER(日本化学会 コロイドおよび界面化学部会)   33 ( 2 )   2 - 6   2008

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    Authorship:Corresponding author   Language:Japanese  

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  • Preparation of hard nanoceramics of borides and functionalization of titania by metallothermic reduction method Reviewed

    Takahiro Ohkubo, Hideki Sakai, Masahiko Abe, Katsuhiro Nishiyama

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   54 ( 4 )   251 - 259   2007.4

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    Authorship:Lead author   Language:Japanese   Publisher:Japan Society of Powder and Powder Metallurgy  

    DOI: 10.2497/jjspm.54.251

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    Other Link: http://id.ndl.go.jp/bib/8799017

  • Storage function of carbon nanospaces for molecules and ions Reviewed

    D. Noguchi, Y. Hattori, C. M. Yang, Y. Tao, T. Konishi, T. Fujikawa, T. Ohkubo, Y. Nobuhara, T. Ohba, H. Tanaka, H. Kanoh, M. Yudasaka, S. Iijima, H. Sakai, M. Abe, Y. J. Kim, M. Endo, K. Kaneko

    ECS Transactions   11 ( 8 )   63 - 75   2007

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    Language:English  

    DOI: 10.1149/1.2783303

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  • Preparation of microtubes with "house of cards" structure on the outer surface by sacrificial template methods

    44 ( 12 )   483 - 491   2006.12

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  • Nano-sized polymer micelle synthesized from cationic gemini surfmer Reviewed

    Ohkubo T, Koike T, Tsubone K, Tsuchiya K, Sakai H, Abe M

    2006 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2006 Technical Proceedings   1   64 - 67   2006

  • ナノ溶液の正体を求めて - ナノ空間での異常な溶液構造

    大久保貴広, 加納博文, 金子克美

    化学   60 ( 3 )   20 - 23   2005

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    Authorship:Lead author   Language:Japanese   Publisher:化学同人  

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  • ナノスケール固体空間中に制約された分子・イオン集団の構造異常

    大久保貴広

    Adsorption News   18, 13-19   2004

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    Authorship:Corresponding author   Language:Japanese  

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  • 制約ナノ溶液の水和構造異常

    大久保 貴広, 加納 博文, 酒井 秀樹

    表面   41 ( 10 )   346 - 356   2003.10

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    Authorship:Lead author   Language:Japanese   Publisher:広信社  

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  • 界面活性剤を使わないでもエマルジョンはできる

    酒井秀樹, 大久保貴広, 阿部正彦

    表面   41 ( 2 )   37 - 44   2003

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    Language:Japanese   Publisher:広信社  

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  • X線回析法によるミクロポアフィリングしたアルコールの構造

    大久保貴広, 飯山拓, 金子克美

    表面   38 ( 6 )   265 - 275   2000

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    Authorship:Lead author   Language:Japanese  

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Awards

  • 研究優秀賞

    2023.8   公益財団法人クリタ水・環境科学振興財団  

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  • Young Researcher Award

    2012.5   Division of Colloid and Interface Science, Chemical Society of Japan  

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    Country:Japan

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  • Encouragement Award

    2008.10   The Japan Society on Adsorption  

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    Country:Japan

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  • 29th Achievement Award

    2006.5   Japan Society of Powder and Powder Metallurgy  

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    Country:Japan

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  • 岡山大学SDGs推進表彰

    2021.3   次世代蓄電デバイス開発によるクリーンエネルギー普及への貢献

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  • Best Contribution Award in Education

    2017.3   Faculty of Science, Okayama University  

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  • Best Paper Award

    2011.4   Japan Research Institute of Material Technology  

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    Country:Japan

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  • Lectureship Award for Young Scientist

    2006.3   Chemical Society of Japan  

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  • 8th Editor's Award

    2005.9   Japan Oil Chemists' Society  

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    Country:Japan

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  • なのはなベンチャー賞

    2000.3   千葉大学VBL  

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    Country:Japan

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Research Projects

  • Creation of innovative adsorption capacity by precise control of surface chemical state of porous boron nitride

    Grant number:24K08566  2024.04 - 2028.03

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

    大久保 貴広

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    Grant amount:\4680000 ( Direct expense: \3600000 、 Indirect expense:\1080000 )

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  • Morphology control of silver dendrites grown under light and study of their optical functions

    Grant number:23H01881  2023.04 - 2026.03

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

    武安 伸幸, 紀和 利彦, 庄司 暁, 大久保 貴広, 狩野 旬

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    Grant amount:\18330000 ( Direct expense: \14100000 、 Indirect expense:\4230000 )

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  • Morphology control of silver dendrites grown under light and study of their optical functions

    Grant number:23K26574  2023.04 - 2026.03

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

    武安 伸幸, 紀和 利彦, 庄司 暁, 大久保 貴広, 狩野 旬

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    Grant amount:\18330000 ( Direct expense: \14100000 、 Indirect expense:\4230000 )

    本研究では,光照射下で成長する銀樹状構造について,その作製条件と形状・サイズとの関係を明らかにする.新しく得られた知見に基づき,フラクタル形状を特徴付ける「フラクタル次元」と「世代数」が制御された銀樹状構造を光照射下で成長させることのできる大面積加工技術を確立する.さらに,フラクタル次元と世代数の揃った銀樹状構造を用いて,可視からテラヘルツ波といった広帯域においてフラクタル形状に特徴的な光学応答を探究する.
    初年度は,新たに青,緑,赤,近赤外CWレーザーを購入し,光を照射しながら銀樹状構造を成長させることのできる光学系を構築した.本光学系を用いて,照射光強度を変えながらナノプレートをシードとして用い,緑レーザー照射下で銀樹状構造を成長させたところ,フラクタル次元の低い構造や2本の枝が並走するように伸びた構造などが見られた.また初年度は,銀樹状構造の観察や光学的性質を評価するために必要となる基盤技術も研究した.置換めっきを利用して,銀樹状構造を金樹状構造へと変換する技術や銀樹状構造表面をシリカ薄膜で被覆する技術を開発した.これらの技術は表面増強ラマン散乱(SERS)応用に有効である.SERS計測の高感度化についても検討した.1体の銀樹状構造で532 nmと785 nmの励起波長を用いてSERSマッピングを測定して波長の違いによる増強電場の分布の違いを観測したり,アミノ酸のSERSスペクトル形状変化についても検討した.銀樹状構造のテラヘルツ域での光学応答を調べるために,銀樹状構造をPMMAに包埋する技術を開発した.銀樹状構造をPMMAに包埋することにより,個々の構造が凝集することなく,分散した状態でテラヘルツ光の透過率を測定できる.

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  • Synthesis of sub-nanoporous boron nitride and its development as adsorbents and catalysts

    Grant number:19K05650  2019.04 - 2022.03

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

    Ohkubo Takahiro

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    Grant amount:\4290000 ( Direct expense: \3300000 、 Indirect expense:\990000 )

    In this research, we developed microporous boron nitride (p-BN). BN is equielectronic with typical graphitic carbon. We succeeded in preparing p-BN composed of both micropores and mesopores. The resistance to thermal oxidation under the atmosphere was revealed to be remarkably superior to that of carbon materials. In addition, a lot of results obviously indicate the p-BN has a stronger interaction with nitrogen molecules than carbon materials due to its specific surface nature. The current study opened up the possibility of using it as a new adsorption material and catalyst carrier.

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  • Creation of Ni(0) with superparamagnetic nature and Ni(I) species and their characterization

    Grant number:16H04118  2016.04 - 2019.03

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

    Kuroda Yasushige

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

    We have succeeded in creating sub-nano sized stable Ni-cluster by utilizing zeolite as a nano-reaction pot and found its prominent superparamagenetic property, and also preparing a novel monovalent nickel ion which accelerates the CO-oxidation reaction even at 300 K. In addition, a monovalent zinc ion, as well as an atomic zinc species, were prepared in zeolite which activate dioxygen at 300 K, resulting in the formation of zinc-oxyl species via zinc ozonide. It has been clarified that thus formed zinc oxyl species activates methane to form methanol at 300 K. On the basis of these data, it has become apparent that the zeolite-lattice as a specific reaction field confers unprecedented electronic states onto the exchanged ions. As a future perspective, it is expected that these fascinating results will give new guidlines for developing efficient materials which exhibit helpful functionalities in both academic and applied fields.

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  • Elucidation of selective adsorption phenomena of anions onto carbon materials and development of carbonaceous adsorbents for anions

    Grant number:15K05645  2015.04 - 2018.03

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

    OHKUBO Takahiro

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    Grant amount:\4810000 ( Direct expense: \3700000 、 Indirect expense:\1110000 )

    In this study, we studied the separation mechanism of anions from aqueous solution by nanoporous carbon materials and required factors for the separation of anions. We found that selective adsorption of anions can be initiated by the formation of adsorbed phase of proton where the surface potential is negative because of the pi-conjugated system of carbon adsorbents. Also, anions can be strongly adsorbed onto the cylindrical nanospace of carbon materials whose pore size is comparable to that of hydrated anions.

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  • Hydration and transport phenomena of ions in nano pores and ion channels

    Grant number:21245006  2009 - 2012

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

    TANAKA Hideki, MATSUMOTO Masakazu, KOGA Kenichiro, OHKUBO Takahiro, OHMINE Iwao

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    Grant amount:\27170000 ( Direct expense: \20900000 、 Indirect expense:\6270000 )

    We examine structure, phase behavior, and transport process in an ideal model of ion channel to establish a microscopic view of dynamics of ions. Anisotropic and limited hydrations of ions in a nano space are investigated by molecular dynamics simulations as well as peculiar phase behaviors of water in a nano space. In addition, we propose a strategic method to search for a new clathrate hydrate by investigating the selectivity of its crystalline structure, which is another type of confinement.

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  • Mechanism of Dissolution and Deposition for Electrolytes underNano-Restricted Conditions

    Grant number:20750013  2008 - 2009

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

    OHKUBO Takahiro

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    Grant amount:\4030000 ( Direct expense: \3100000 、 Indirect expense:\930000 )

    The hydration structure of zinc ions confined in nanospaces of activated carbons was determined by XAFS and powder XRD measurements. XAFS spectra indicate that the distorted hydration structure whose structure is remarkably different from that in the bulk aqueous solution is formed in the nanospace. In addition, XRD band at d=2.0 nm was appeared for the aqueous solution confined in the nanospace whose average pore width is 0.7 nm, stemming from the ordering of molecular assembly of aqueous solution of zinc acetate.

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  • Size and shape control of metal nanoparticles using dendron ligands

    Grant number:18510088  2006 - 2007

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

    TORIGOE Kanjiro, ABE Masahiko, SAKAI Hideki, SHONO Atsushi

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    Grant amount:\3970000 ( Direct expense: \3700000 、 Indirect expense:\270000 )

    Physical and chemical properties of metal nanoparticles strongly depend on their size and shape, thus their control is very important in both basic researches and applications. We have attempted to control the particle size by two different systems : microflow reactor and reversed micelle.
    First in the microflow reactor system, poly (benzyl ether) dendron ligands of generations 1 to 4 with an amino focal group have been synthesized. These dendron ligands were mixed with an organometallic compound (palladium (II) acetate, Pd(OAc)_2) in an inert solvent with a high boiling point (diphenyl ether, bp.259℃) and pushed out from a syringe to a silica microflow reactor with 150-300μm in inner diameter. The Pd nanoparticles were yielded by thermal decomposition of Pd (OAc)_2. In this system, effects of flow parameters, i.e. reaction temperature, inner diameter of the reactor, flow rate, concentrations ofprecursor and ligand, have been investigated. The following results were obtained : (1) The particle size increases from 2.7 to 4.8 nm with increasing the reaction temperature, (2) the particle size decreases with increasing linear flow rate but does not depend on the volume flow rate. Moreover, (3) the particle size shows the minimum at r=1-2where r is defined by the dendrimer to metal precursor molar ratio. We found also that the particle size does not vary in a wide concentration range of the metal precursor (1-27mM) with keeping an excellent monodispersity, while in the batch reactor, a significant increase in both the mean particle size and the polydispersity was observed with increasing the precursor concentration. This implies that the microflow reactor system is feasible for mass production of size-regulated metal nanoparticles.
    Second, poly (benzyl ether) dendrons attached with a polyethyleneglycol (PEG) chain at the focal point were synthesized for making reverse micelles in organic solvents. Since the hydrophil/lyophil balance (HLB) varies with the length of PEG chain(n), we started with n=6. However, it was not long enough to solubilize water in the reverse micelle. Therefore we synthesized the dendron with a longer PEG chain, n=8 and 11.5. The dendon with the longest PEG chain has been found to solubilize water in the reverse micelles in toluene. However, it is not yet clear that these micelles can work as a reservoir for metal nanoparticles.

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  • 重合性界面活性剤を用いた新規ナノ細孔体の創製と機能解明

    Grant number:17710102  2005 - 2006

    日本学術振興会  科学研究費助成事業  若手研究(B)

    大久保 貴広

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    Grant amount:\3100000 ( Direct expense: \3100000 )

    本研究では、新規重合性界面活性剤を用いた規則性ナノ細孔性材料の合成法の確立と機能の解明を目指している。昨年度までに、重合性ジェミニ型界面活性剤[CH_2=C(CH_3)COOC_<11>H_<22>(CH_3)_2N^+]_2(CH_2)_2・2Br^-:PG)、それに対応する一本鎖の重合性界面活性剤(PM)の合成を終え、重合性基を有していない比較物質である、tetradecylammonium bromide(TTAB)、cetyltrimethylammonium bromide(CTAB)の2種類も含めた水溶液物性の解明を行った。更に、20mMのPG水溶液10mlにラジカル開始剤2,2-azobis(2-methylpropionamidine)を2×10^<-4>mol添加し、60℃、2hの条件で重合反応を行ったところ、約3nmの単分散なポリマーミセルの創製に成功した。
    本年度は、ポリマーミセルの形状を制御するための条件について検討した。最終的な目標は、高比表面積材料の創製であるため、集合体の形状が重要であると考えたからである。まず、界面活性剤の対イオンの影響を同一とするためにNaBr添加系における水溶液物性の解析をWilhelmy法による表面張力測定から検討した。その結果、PGについて、NaBr濃度を増加させると非球状ミセル領域が認められ、昨年度までに得られた球状以外のポリマーミセルを得られる可能性が示された。この非球状ミセル領域において、cryo-TEM観察による集合体の直接観察を行ったところ、紐状ミセルの形状を有していることがわかり、この領域(PG濃度:10mM、NaBr濃度:0.02M)において同様の重合反応を試みたところ、TEM観察より、円筒状のポリマーミセルが得られることがわかった。
    本研究によりナノオーダーの長さと空間を有するポリマーの創製が可能となった。

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  • ナノスペース制約空間中におけるイオン溶液構造と特性

    Grant number:02J02628  2002 - 2003

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    大久保 貴広

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    Grant amount:\2500000 ( Direct expense: \2500000 )

    本研究は、1nm程度の極薄スリット空間中におけるイオンの状態を局所構造解析から検討することを目的として行われた。特に本年度は細孔の形状が吸着した電解質溶液の構造形成に与える影響について解明することに成功した。
    ナノ細孔を与える試料としては、スリット型細孔を有するピッチ系活性炭素繊維(ACF;P5及びP20、平均細孔径はそれぞれ0.7、1.1nm)と、円筒状細孔を有するsingle-wall carbon nanohorn(SWNH)を用いた。ここで、SWNHに関しては、有効な円筒状細孔へ吸着させるために酸素気流下で酸化処理したもの(ox-SWNHと表記する)を用い、比較のために酸化処理前の試料についても検討を行った。これらの細孔性試料に電解質水溶液の臭化ルビジウム水溶液(1mol/cm^3)を真空加熱脱気後のACFおよびSWNHに直接導入し電解質溶液を細孔内に含浸した。余分な水分を取り除く為に再び真空加熱脱気を行い、その後、水を303kにおける飽和蒸気圧下にて再吸着させた試料についてEXAFS測定(高エネルギー加速器研究機構;KEK-PF BL-10B、課題番号2002G242)を行った。
    昨年度の研究成果より、スリット型ナノ細孔内におけるイオンへの水和構造は、細孔径に依存した特異な構造を示すことがわかっている。スリット型細孔が0.7nm程度になると、バルクにおける溶媒和構造を保てる程のスペースが確保できず、歪んだ形での水和構造を示す。イオン-水間の距離がバルクのそれよりも小さくなり、イオンに配位する水分子の数も減少することから、細孔のポテンシャル場に強く制約された形で吸着しているものと考えられる。一方、スリット型細孔が1.1nm程度になると、イオンに配位する水分子が0.7nmの場合よりも更に減少し、配位水までの距離及び数は依然としてバルクの水溶液よりも小さい。特に1.1nmのスリット空間内では、水分子間のクラスター形成が優位となりイオンに配位する水分子の数が急激に減少することが明らかとなった。一方、ox-SWNH内に制約されたイオンの水和構造は、第1水和殻までの距離が短くなり、水和数が2〜3程度になることが明らかとなった。バルク水溶液中における水和数が6であるルビジウムイオンの場合でさえ、このような水和数の著しい減少が見られたのは興味深い。ナノ細孔内における擬圧縮効果が水和構造に与える影響が非常に大きいこと、そして、ナノ細孔の形状を鋭敏に反映した水和構造をとり得ることが明らかとなった。

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