Imai, Hiroaki

写真a

Affiliation

Faculty of Science and Technology, Department of Applied Chemistry (Yagami)

Position

Professor

Related Websites

External Links

Profile Summary 【 Display / hide

  • 材料化学、バイオミネラリゼーション、無機機能材料、自己組織化プロセス

Career 【 Display / hide

  • 1985.04
    -
    1985.11

    日本酸素株式会社開発本部

  • 1985.11
    -
    1987.12

    工業技術院電子技術総合研究所出向

  • 1988.01
    -
    1992.03

    日本酸素株式会社技術本部

  • 1992.04
    -
    1993.03

    日本酸素株式会社電子機材事業本部

  • 1993.04
    -
    1996.03

    慶應義塾大学(理工学部)助手

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Academic Background 【 Display / hide

  • 1983.03

    Keio University, Faculty of Engineering, 応用化学科

    University, Graduated

  • 1985.03

    Keio University, Graduate School, Division of Engineering, 応用化学専攻

    Graduate School, Completed, Master's course

Academic Degrees 【 Display / hide

  • 工学 , Keio University, 1990.03

 

Books 【 Display / hide

  • Nanoscience Volume 1:Nanostructures through Chemistry

    Yuya Oaki and Hiroaki Imai, The Royal Society of Chemistry, 2013

    Scope: 1-28

  • Mesoscale Chemistry

    Hiroaki Imai, Yuya Oaki, Pan Stanford Publishing. Ltd., 2012

  • 最先端材料システムワンポイントシリーズ「自己組織化と機能材料」

    IMAI HIROAKI, 共立出版, 2012

  • セラミックデータブック 2010/11

    IMAI HIROAKI, 2010

    Scope: 68-72

  • ナノ蛍光体の開発と応用

    IMAI HIROAKI, エヌ・ティー・エス, 2007

    Scope: 173-181

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Papers 【 Display / hide

  • Bending Fibers of Hydroxyapatite for Ordered Parallel Architecture in Bovine Tooth Enamel

    Yukimasa Y., Takasaki M., Oaki Y., Imai H.

    ACS Omega (ACS Omega)  4 ( 2 ) 3739 - 3744 2019.02

     View Summary

    Copyright © 2019 American Chemical Society. The nanometer-scale bending structure in the enamel-dentin interfacial region of bovine teeth was clarified using detailed electron micrographs. We found that enamel prisms of width 5-10 μm in the enamel are regarded as a bundle of nanometer-scale hydroxyapatite (HA) fibers of width 20-30 nm that are connected to the enamel-dentin interface. The radial arrangements of HA fibers elongated in the c-axis were formed on the dentin surface at the boundary. The orientation adjustment of the HA fibers was observed through stepwise bending with a gradual change of the c direction in the ordered parallel array of the enamel prisms. Our observation suggests that the crystallographic ordering in the enamel layer originates from the growth-induced orientation of HA crystals in the interfacial region.

  • Highly porous polymer dendrites of pyrrole derivatives synthesized through rapid oxidative polymerization

    Ishii K., Sato K., Oaki Y., Imai H.

    Polymer Journal (Polymer Journal)  51 ( 1 ) 11 - 18 2019.01

    ISSN  00323896

     View Summary

    © 2018, The Society of Polymer Science, Japan. Highly porous organic structures are synthesized by the oxidative polymerization of pyrrole derivatives in a concentrated monomer and oxidant solution. The rapid polymerization of pyrrole by oxidation with FeCl 3 in CHCl 3 as a cosolvent for the monomer and the oxidant leads to nanometer-scale branching morphologies that have a specific surface area of ~200 m 2 g −1 . The polymerization of pyrrole derivatives, such as 1-methylpyrrole and 1-ethylpyrrole, produced intragranular micropores of ~1 nm in diameter in the polymer grains of nanoscale dendrites. We obtained highly porous polymers of polypyrrole derivatives that have high specific surface areas (~900 m 2 g −1 ) with bimodal pore-size distribution. The enhanced adsorbability of porous polymer dendrites for aromatic molecules was confirmed, in comparison with that of conventional polystyrene adsorbents.

  • Tunable Stimuli-Responsive Color-Change Properties of Layered Organic Composites

    Takeuchi M., Gnanasekaran K., Friedrich H., Imai H., Sommerdijk N., Oaki Y.

    Advanced Functional Materials (Advanced Functional Materials)  28 ( 45 )  2018.11

    ISSN  1616301X

     View Summary

    © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Stimuli-responsive properties of soft materials originate from dynamic structure changes. Layered polydiacetylene (PDA) shows color-change properties with the application of external stimuli, such as thermal and mechanical stresses. Layered organic materials possessing intercalation capabilities and dynamic properties have potentials for tuning their structures and properties by the intercalated guests. A variety of sensing and imaging devices can be developed by control of the stimuli responsivity. Here, the key structures, processes, and mechanisms for tuning the stimuli-responsive color-change properties of layered PDA are studied by in situ analyses with heating and cooling. The in situ analyses indicate that heating initiates thermal motion of the alkyl side chains of the PDA main chain in the host layers around 60 °C, regardless of the type of intercalated guests. Further heating induces torsion of the PDA main chain leading to color changes at different temperatures, depending on the types of the intercalated guest. Then, the layered structure is irreversibly deformed with lowering the crystallinity. The results indicate that the stimuli-responsive color-change properties are controlled by the rigidity of the layered structures consisting of the host layers and guests. The control strategy based on rigidity tuning can be applied to a variety of soft materials with stimuli responsivity.

  • Layer-by-Layer Manipulation of Heterogeneous Rectangular Nanoblocks: Brick Work for Multilayered Structures with Specific Heterojunction

    Matsumoto R., Takasaki M., Tsukiyama K., Oaki Y., Imai H.

    Inorganic Chemistry (Inorganic Chemistry)  57 ( 18 ) 11655 - 11661 2018.09

    ISSN  00201669

     View Summary

    © 2018 American Chemical Society. The combination of heterogeneous inorganic nanocrystals provides novel nanometer-scale architectures for exploration of novel functions. In the present study, heterogeneous bilayers, such as BaTiO3-Fe3O4 and Mn3O4-CeO2, are fabricated via layer-by-layer stacking of several rectangular nanoblocks 5-23 nm in size by evaporation-driven self-assembly. Specific heterojunctions between inorganic crystals are constructed by nanoscale simple brick work through spontaneous adjustment of the crystallographic orientations of the nanoblocks in the lower and upper layers.

  • Layer-by-layer manipulation of anisotropic nanoblocks: Orientation-switched superlattices through orthogonal stacking of: A and c directions

    Nakagawa Y., Matsumoto R., Kageyama H., Oaki Y., Imai H.

    Nanoscale (Nanoscale)  10 ( 27 ) 12957 - 12962 2018.07

    ISSN  20403364

     View Summary

    © 2018 The Royal Society of Chemistry. Nanometer-scale switching of the crystallographic orientation enables production of novel superlattices for exploration of new functions. Elaborate multilayered architectures of Mn3O4 nanocuboids were constructed by a convective self-assembly process. The nanometric cuboids were accumulated into orientation-switched superlattices on micrometric scales by controlling the a and c directions of the tetragonal crystal periodically. The orthogonal stacking of the tetragonal nanoblocks was achieved through the layer-by-layer manipulation process of two types of 2D arrays with different orientations.

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Papers, etc., Registered in KOARA 【 Display / hide

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Reviews, Commentaries, etc. 【 Display / hide

  • バイオミネラリゼーションを応用した有機/無機複合材料の開発とこれからの研究開発テーマ

    IMAI HIROAKI

    研究開発リーダー 1   8 - 12 2014

    Introduction and explanation (others), Joint Work

Presentations 【 Display / hide

  • ゾルゲル法による多孔質スピネル型MgMn2O4の合成およびマグネシウム二次電池への応用

    Hiroaki Imai

    The Ceramic Society of Japan Annual Meeting 2019 (Kogakuin University (Shinjuku Campus)) , 2019.03, Oral Presentation(general)

  • ドライおよびウェットな低温環境におけるカルサイトナノ結晶の開裂と粒成長

    Hiroaki Imai

    The Ceramic Society of Japan Annual Meeting 2019 (Kogakuin University (Shinjuku Campus)) , 2019.03, Oral Presentation(general)

  • カルサイトナノロッドの単層集積によるナノスケールパターンの形成

    Hiroaki Imai

    The Ceramic Society of Japan Annual Meeting 2019 (Kogakuin University (Shinjuku Campus)) , 2019.03, Oral Presentation(general)

  • Fe3O4ナノキューブ単層配列体の作製およびその磁気特性の評価

    Hiroaki Imai

    The Ceramic Society of Japan Annual Meeting 2019 (Kogakuin University (Shinjuku Campus)) , 2019.03, Oral Presentation(general)

  • 炭酸含有水酸アパタイトナノ粒子の合成とマクロ造形への応用

    Hiroaki Imai

    The Ceramic Society of Japan Annual Meeting 2019 (Kogakuin University (Shinjuku Campus)) , 2019.03, Oral Presentation(general)

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Research Projects of Competitive Funds, etc. 【 Display / hide

  • デザインされた異方性ナノブロックによる秩序配列マテリアルの構築と機能開拓

    2016.04
    -
    2020.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, 今井 宏明, Grant-in-Aid for Scientific Research (A) , Principal Investigator

  • Clarification of crystal growth through oriented attachment and its application for development of nanomaterials

    2015.04
    -
    2018.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, 今井 宏明, Grant-in-Aid for Challenging Exploratory Research, Principal Investigator

Works 【 Display / hide

  • 実験化学講座「無機化合物」

    IMAI HIROAKI

    2005.03
    -
    Present

    Other, Joint

     View Details

    固体化学・無機材料化学の研究・教育に重要な各種の実験技術の解説書。

  • セラミックス大学

    IMAI HIROAKI

    2000.05
    -
    2006.10

    Other, Joint

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    年間7〜8回の講義を通して、セラミックスの基礎と応用を社会人、大学生を問わず分かりやすく解説する教育講座の企画および講師を担当。

Awards 【 Display / hide

  • 日本結晶成長学会第32回論文賞

    今井宏明, 2015.10, 日本結晶成長学会, メソ結晶におけるねじれ形態発現機構の解明とその制御

  • 第 68 回(平成 25 年度)日本セラミックス協会賞学術賞

    今井宏明, 2013.11, 公益社団法人日本セラミックス協会, バイオミネラルに着想を得たセラミックス合成プロセスの深化と応用

 

Courses Taught 【 Display / hide

  • SEMINAR IN APPLIED CHEMISTRY

    2021

  • SCIENCE OF SELF-ASSEMBLY

    2021

  • NANO SCALE SCIENCE JOINT SEMINAR

    2021

  • MATERIAL DESIGN SCIENCE JOINT SEMINAR

    2021

  • LABORATORIES IN APPLIED CHEMISTRY C

    2021

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Social Activities 【 Display / hide

  • 全国高校化学グランプリ2012・2次選考特別講演・公益社団法人日本化学会

    2012.08

     View Summary

    参加者:中高生約80名

  • ひらめき☆ときめきサイエンス~ようこそ大学の研究室へ~KAKENHI:「生き物による結晶づくりを学び・まねしよう」講義と実験

    2011.08

     View Summary

    参加者:中高生19名
    於:慶応義塾大学矢上キャンパス

  • 全国高校化学グランプリ2011 2次選考特別講演

    2011.08

     View Summary

    主催:「夢・化学-21」委員会
    参加者:中高生約80名
    於:慶應義塾大学日吉・矢上キャンパス

  • 独立行政法人産業技術総合研究所

    2008.05
    -
    Present
  • 独立行政法人物質・材料研究機構

    2001.05
    -
    2005.03

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Memberships in Academic Societies 【 Display / hide

  • 日本セラミックス協会編集委員会, 

    2010.04
    -
    2018.06
  • 日本セラミックス協会行事企画委員会, 

    2007.04
    -
    2009.03
  • 日本化学会欧文誌編集員会, 

    2005.04
    -
    2010.03
  • 日本ゾルゲル学会, 

    2003.07
    -
    Present
  • 日本結晶成長学会, 

    2000.04
    -
    Present

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Committee Experiences 【 Display / hide

  • 2018.06
    -
    Present

    運営委員会委員長, 日本セラミックス協会

  • 2010.04
    -
    2018.06

    Editor, 日本セラミックス協会編集委員会

  • 2008.05
    -
    2010.04

    客員研究官, 独立行政法人産業技術総合研究所

  • 2007.04
    -
    2009.03

    Committee Chair, 日本セラミックス協会行事企画委員会

  • 2005.04
    -
    2010.03

    Editor, 日本化学会欧文誌編集員会

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