Asakura, Kouichi



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



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Profile Summary 【 Display / hide

  • '''''''Analyze, control and design non-equilibrium chemical system aiming at development of useful technology in organic chemical industry.'''''''

Career 【 Display / hide

  • 1990.04

    慶應義塾大学(理工学部) ,助手

  • 1993.04

    工学院大学 ,兼任講師

  • 1996.09

    Wake Forest大学(米国), 訪問教員

  • 1999.04

    慶應義塾大学(理工学部) ,専任講師

  • 2003.04

    慶應義塾大学(理工学部) ,助教授

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Academic Background 【 Display / hide

  • 1985.03

    Keio University, Faculty of Science and Engineering, 応用化学科

    University, Graduated

  • 1987.03

    Keio University, Graduate School, Division of Science and Engineeri, 応用化学専攻

    Graduate School, Completed, Master's course

  • 1990.03

    Keio University, Graduate School, Division of Science and Engineeri, 応用化学専攻

    Graduate School, Completed, Doctoral course

Academic Degrees 【 Display / hide

  • 工学 , Keio University, 1990.03


Research Areas 【 Display / hide

  • Organic chemistry (Industrial Organic Chemistry)

  • Basic chemistry (Industrial Physical Chemistry)

  • Thin film/Surface and interfacial physical properties (Surface Physics)

  • Functional solid state chemistry ("Function, Properties and Materials in Chemistry")

  • Basic chemistry (Physical Chemistry)

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Research Keywords 【 Display / hide

  • 化学反応系の制御と設計

  • 化粧品物理化学

  • 散逸構造

  • 自発的ホモキラリティーの発生

  • 非平衡系の自己組織化

Research Themes 【 Display / hide

  • Analyze, control and design non-equilibrium chemical system aiming at development of useful technology in organic chemical industry., 


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Proposed Theme of Joint Research 【 Display / hide

  • 塗工・塗装技術、サンスクリーン剤のin vitro性能評価


Books 【 Display / hide

  • 自己組織化ナノマテリアル-フロントランナー85人が語るナノテクノロジーの新潮流-

    朝倉 浩一, フロンティア出版,東京, 2007

    Scope: 第4章17,p.227-232

  • 撥水・撥油の技術と材料

    朝倉 浩一, シーエムシー出版,東京, 2008

    Scope: 第12章,125-132

  • エレクトロニクス・エネルギー分野における超撥水・超親水化技術

    朝倉 浩一, 東京, 2012

    Scope: 第3章,第2節, 269-277

  • 液膜塗工における表面状態制御

    ASAKURA KOUICHI, 技術情報協会, 2013

    Scope: 第10章 第8節, p. 652-657

  • 生体模倣技術としての散逸構造の形成, 生物模倣技術と新材料・新製品開発への応用

    ASAKURA KOUICHI, 技術情報協会, 2014.07

    Scope: 第8章 第3節 p.583-590

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Papers 【 Display / hide

  • Surface structures of cosmetic standard poly methyl methacrylate UV evaluation plates and their influence on the in vitro evaluation of UV protection abilities of cosmetic sunscreens

    Kuroda A., Sakai K., Yahagi S., Mukawa T., Sato N., Nakamura N., Maezawa D., Masaki H., Banno T., Asakura K.

    Journal of Oleo Science (Journal of Oleo Science)  68 ( 2 ) 175 - 182 2019

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  13458957

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    © 2019 by Japan Oil Chemists’ Society. Cosmetic standard poly methyl methacrylate (PMMA) UV evaluation plates, i.e., roughened PMMA plates, are used in the EU and the US for the in vitro evaluation of UV protection abilities of sunscreen, such as in vitro UVA-PF and critical wavelength for the Broad-spectrum approval. In our previous studies, inhomogeneity in the thickness of a pseudo-sunscreen layer applied on a flat quartz plate was observed to alter UV transmission. Thus, the surface roughness of the standard plates should have a significant influence on the in vitro evaluation. In the present study, we have analyzed the surface structures of three cosmetic standard PMMA UV evaluation plates: Helioplates HD6 (Sa = 6 µm) and ISO plates (Ra = 2 and 5 µm). A decamethylcyclopentasiloxane and 2-propanol-mixed solvent solution of acrylsilicone resin was prepared, and the solution was added dropwise onto the plates. After the evaporation of the solvents, the plates were cut and the cross section was analyzed using SEM-EDS. The distribution of silicon atoms at the cross-section suggested that the maximum depth of penetrating of acrylsilicone resin was larger than Ra for all the standard plates, and the surface structure was significantly different for each standard plate. In addition, cracks into which the acrylsilicone resin deeply penetrated were observed on the surface of some plates. Clear-solution-type pseudo-sunscreen samples in which UV absorbers and acrylsilicone resin were dissolved were deposited on the standard roughened PMMA plates. It was observed that the addition of acrylsilicone resin drastically changed the net UV transmission. The degree to which the hollows of the roughened surface were filled with the pseudo-sunscreen samples determined the variation of UV transmittance.

  • Hydrophilicity of the substrate surface under the applied sunscreen layer changes in vitro UV protection efficacies

    Kouichi Asakura, Akihiro Kuroda

    IFSCC Magazine (IFSCC)  21   53 - 57 2018.08

    Research paper (scientific journal), Joint Work, Accepted

  • Locomotion Mode of Micrometer-Sized Oil Droplets in Solutions of Cationic Surfactants Having Ester or Ether Linkages

    Hirono A., Toyota T., Asakura K., Banno T.

    Langmuir (Langmuir)  34 ( 26 ) 7821 - 7826 2018.07

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  07437463

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    © 2018 American Chemical Society. Micrometer-sized self-propelled oil droplets under a far-from-equilibrium condition have drawn much attention because of their potential as a dynamic model for the chemical machinery in living organisms. To clarify the effect of interactions between the system components (surfactant, oil, and water) on the locomotion mode of droplets, we investigated the behaviors of oil droplets composed of n-heptyloxybenzaldehyde (HBA) in solutions of cationic surfactants having or not having an ester or an ether linkage. It was observed that in solutions of cationic surfactants having an ester or an ether linkage, spherical HBA droplets self-propelled by changing their direction frequently. On the other hand, when this functional group is absent, a slow self-propelled motion of the oil droplets concurrent with the evolution of aggregates on their surface was observed. From the results of measurement of interfacial tension and assessment of self-emulsification, we determined that the attractive interactions of cationic surfactants without an ester or an ether linkage with HBA are stronger than those having the linkage. The difference in the locomotion mode of oil droplets is probably explained from the viewpoint of the interactions among the system components.

  • Effect of freeze–thaw treatment on the precipitation of octyl β-D-Galactoside hemihydrate crystal from the aqueous solution

    Ogawa S., Takahashi I., Koga M., Asakura K., Osanai S.

    Journal of Oleo Science (Journal of Oleo Science)  67 ( 5 ) 627 - 637 2018

    Joint Work, Accepted,  ISSN  13458957

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    © 2018 by Japan Oil Chemists’ Society. Cryogenic treatment, like the freeze–thaw process, has been reported to be effective in modifying the physicochemical properties of polymeric hydrogels. However, not much attention has been paid to this process in terms of the precipitation of surfactant–water systems. In this study, two effective cryogenic methodologies were successfully reported to alter the physicochemical properties of a precipitate of an octyl β-D-galactoside (Oct-Gal)–water system. First, hyperrapid cooling (i.e., cooling at 30℃/min) was found to be an effective type of cryogenic treatment: the phase transition temperature (T K ) and enthalpy at the phase transition (ΔH K ) between the crystal-dispersed phase and the sol (micelle) phase significantly decreased. In addition, cryogenic treatment in the presence of electrolytes, such as NaCl, NaBr, and CsCl, was effective even in the absence of the hyperrapid cooling condition. The hyperrapid cooling or the addition of certain electrolytes was considered to prevent the precipitation of the Oct-Gal hemihydrate crystals prior to the complete freezing of ice and the electrolyte/ice eutectic. Hence, the size of the aggregated crystals prepared by the above-mentioned effective cryogenic treatments seemed to be decreased compared with that of the normal precipitated crystals, thereby changing T K and ΔH K . Thus, two basic methodologies for the modification of the physicochemical properties of the crystal-dispersed phase of surfactant–water systems are discussed.

  • Coagel prepared from aqueous octyl β-D-galactoside solution

    S. Ogawa, M. Koga, K. Asakura, I. Takahashi, S. Osanai

    J. Surfact. Det. 20 ( 1 ) 255 - 261 2017

    Research paper (scientific journal), Joint Work, Accepted

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

Reviews, Commentaries, etc. 【 Display / hide

  • 塗工過程における自発的な空間周期構造の発生とその制御による表面の機能化


    塗装工学 48 ( 5 ) 190 - 197 2013

    Introduction and explanation (scientific journal), Single Work

  • 表面形成における非平衡系の自己組織化の制御


    オレオサイエンス 13 ( 4 ) 171 - 177 2013

    Introduction and explanation (scientific journal), Single Work

Presentations 【 Display / hide

  • Far-from-equilibrium dynamic interface spontaneously generated in drying and mixing processes of two miscible solvents

    Kouichi Asakura, Haruka Watanabe, Taisuke Banno, Shoji Takekawa

    2018 AOCS Annual Meeting & Expo (Minneapolis, (USA)) , 2018.05, Oral Presentation(general), AOCS

  • Surface coating technology developed in far-from-equilibrium systems

    Asakura, K.

    Gordon Research Conference “Oscillations & Dynamic Instabilities in Chemical Systems” (Lucca, Italy) , 2010.07, Oral Presentation(general)

  • Preparation of Photonics Polymers by Spontaneous Frontal Polymerization

    K. Asakura, A. Takata, J. Omoto, E. Nihei

    American Chemical Society National Meeting, Symposium on Nonlinear Dynamics in Polymeric Systems, 2008.04, Oral Presentation(guest/special)

  • Emergence of Homochirality in Chemical Systems

    K. Asakura

    NORTIDA Program "Origins of Homochirality", 2008.02, Oral Presentation(guest/special)

  • Spontaneous Generation of Hot and Reacted Region to Form Propagating Front in a Reaction System of Free-radical Polymerization of Methyl Methacrylate

    朝倉 浩一,井雲昭仁,原澤宏和,小山内州一,二瓶栄輔

    American Chemical Society National Meeting, Symposium on Nonlinear Dynamics in Polymeric Systems (Boston, U.S.A.) , 2002.08, Oral Presentation(guest/special)

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

  • 共同研究


    Joint research

  • 共同研究


    Joint research

  • サンスクリーン剤の紫外線防御機能を普く正確にin vitro評価する測定方法の確立


    公益財団法人 コスメトロジー研究振興財団, 2016年度 「コスメトロジー研究」研究助成, 朝倉 浩一

  • 共同研究


    Joint research

  • グリーンイノベーションのための分子ナノテクノロジー拠点形成


    戦略的研究基盤形成支援事業, MEST-Supported Program for the Strategic Research Foundation at Private Universities, Research grant

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Works 【 Display / hide

  • 第6回宇宙環境利用に関する地上研究

    朝倉 浩一


    Other, Single

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Intellectual Property Rights, etc. 【 Display / hide

  • 紫外線吸収剤又は赤外線遮断剤含有水性組成物の紫外線防御効果又は赤外線防御効果の測定方法及び測定装置

    Application No.: PCT/JP2017/031362  2017 

    Patent, Joint, PCT international application

  • 回転霧化式静電塗装装置のベルカップ

    Application No.: PCT/JP2013/075465  2013.09 

    Announcement No.: WO2014/054438  2014.04 

    Registration No.: 5830612  2015.10

    Patent, Joint, PCT international application

  • 化粧料の紫外線防御効果の測定方法、測定装置、及び測定値の表示方法

    Application No.: 特願2010-206174  2010.09 

    Announcement No.: 特許公開2012-063180  2012.03 

    Registration No.: 5825654  2015.10

    Patent, Joint, National application

  • 紫外線吸収剤又は赤外線遮断剤含有水性組成物の紫外線防御効果又は赤外線防御効果の測定方法及び測定装置

    Application No.: 特許出願2016-174084  2016 

    Patent, Joint, National application

  • 高撥水性組成物

    Application No.: 特許出願2007-227523  2006.09 

    Announcement No.: 特許公開2008-101197  2008.05 

    Registration No.: 特許第5466356号 

    Patent, Joint, National application

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Awards 【 Display / hide

  • (社)日本油化学会進歩賞

    Kouichi Asakura, 2002.03, (社)日本油化学会, 有機基質の劣化防止に対する新規物質及び新規技術の開発に関する研究

    Type of Award: Awards of National Conference, Council and Symposium


Courses Taught 【 Display / hide











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Social Activities 【 Display / hide

  • Department of Chemistry, Wake Forest University (U


Memberships in Academic Societies 【 Display / hide

  • 日本油化学会, 

  • 日本塗装技術協会, 

  • 日本油化学会 油化学・新時代の展開プロジェクトチーム, 

  • 日本油化学会オレオマテリアル部会, 

  • 第16回「非線形反応と協同現象」研究会, 


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Committee Experiences 【 Display / hide

  • 2017.04

    理事 副会長・運営委員会委員長, 日本油化学会

  • 2014.09

    副委員長, 日本油化学会, 学術専門委員会

  • 2011.04

    Journal of Ole Science誌, Executive editor (Field: Detergents & Interface Science), 日本油化学会

  • 2007.04

    幹事, 日本油化学会オレオマテリアル部会

  • 2000.04

    委員, 日本油化学会規格試験法委員会

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