Fukui, Yuuka



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


Associate Professor

Related Websites

Career 【 Display / hide

  • 2015.04

    慶應義塾大学, 理工学部 応用化学科, 助教

  • 2017.04

    慶應義塾大学, 理工学部 応用化学科, 専任講師

Academic Background 【 Display / hide

  • 2003.04

    Keio University, 理工学部, 応用化学科

    University, Graduated

  • 2007.04

    慶應義塾大学大学院, 理工学研究科, 生物化学専修

    Graduate School, Master's course

  • 2009.04

    慶應義塾大学大学院, 理工学研究科, 生物化学専修

    Graduate School, Doctoral course

Academic Degrees 【 Display / hide

  • 博士(工学), Keio University, Coursework, 2012.03


Books 【 Display / hide

  • 高分子微粒子の最新技術動向

    シーエムシー出版, 2022.07

    Scope: 高分子微粒子の構造・配列・付着・埋没・ナノインプリントを利用した表面改質

  • 高分子基礎ガイド

    藤本啓二, 川口正剛, 小泉智, 福井有香, 箕田雅彦, 本柳仁, 朝倉書店, 2022.02,  Page: 153

  • 高分子微粒子のつくり方と活かし方

    藤本啓二, 福井有香, 塗装工学 (一般社団法人 日本塗装技術協会) 54 ( 11 ) , 2019.11,  Page: 394 - 403

  • ドラッグデリバリーシステム・バイオ医薬品創成に向けた組織、細胞内、核内送達技術の開発

    福井有香, 藤本啓二, シーエムシー出版, 2018.08

    Scope: リポソームの表面改質によるナノカプセルの作製と機能化,  Contact page: 195-206

  • 中空微粒子の合成と応用

    FUKUI YuukaFUJIMOTO Keiji, シーエムシー出版, 2017

    Scope: リポソームを鋳型とした中空微粒子の合成

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Papers 【 Display / hide

  • One-pot generation of gold-polymer hybrid nanoparticles using a miniemulsion reactor system

    Yuuka Fukui, Kaori Fujino, Keiji Fujimoto

    Colloids and Surfaces A: Physicochemical and Engineering Aspects (Elsevier)  666 2023.06

    Research paper (scientific journal), Joint Work, Corresponding author, Accepted,  ISSN  09277757

     View Summary

    We investigated one-pot synthesis of gold nanoparticles (AuNPs) and AuNPs-polymer hybrid nanoparticles in a water-in-oil (W/O) miniemulsion. Water nanodroplets were dispersed as a reactor in cyclohexane using dimethicone as a surfactant. First, we intended to generate AuNPs in water nanodroplets, which contained HAuCl4 with a mixture of 1-vinylpyrrolidone (VP) and N,N’-methylenebisacrylamide (MBAAm). Several AuNPs with the size of approximately 10–20 nm were generated in each nanodroplet via reduction of AuCl4- by dimethicone. On the other hand, AuNPs was scarcely generated in water nanodroplets containing HAuCl4 with 2-hydroxyethyl methacrylate (HEMA). Next, we carried out polymerization in water nanodroplets to encapsulate AuNPs into polymer nanoparticles. Several AuNPs were encapsulated within polymer particles by copolymerization of VP and MBAAm with an oil-soluble initiator (V-601), and some AuNPs were present in the oil phase. The encapsulation efficiency of AuNPs was 34%. The encapsulation efficiency of AuNPs was dramatically increased by increasing the concentration of the initiator. The same result was obtained by increasing the concentration of the crosslinker due to rapid gelation of nanodroplets. On the other hand, monodisperse particles could be obtained by polymerization of HEMA using a water-soluble initiator (V-65). After polymerization for 5 d at 65ºC, the color of the suspension changed from opaque blue to blue purple and the encapsulation efficiency of AuNPs (5–20 nm) increased to 99 wt%. The average number of AuNPs encapsulated in a PHEMA nanoparticle increased from 1.5 to 4.6 particle. Furthermore, the size of AuNPs could be tuned by increasing the HAuCl4 concentration, and the corresponding color of the suspensions such as blue, purple, and red could be observed. The number and location of AuNPs in polymer nanoparticles could also be tuned by additives such as L-histidine and polyvinylpyrrolidone. By drop-casting the obtained hybrid nanoparticles, we could obtain gold-polymer hybrid films where AuNPs were evenly distributed within a film. The films exhibited different colors corresponding to their LSPR of AuNPs.

  • Control in Coloration and Estimation of the Refractive Index by Porous Polymeric Membranes Prepared by the "Miniemulsion" Templating Method

    Fukui Y., Sumida H., Sugaya Y., Fujimoto K.

    ACS Applied Polymer Materials (ACS Applied Polymer Materials)  4 ( 10 ) 7547 - 7553 2022.10

     View Summary

    We fabricated porous polymeric membranes using the miniemulsion templating method to investigate the transmitted and scattered lights in terms of the Christiansen filter effect. This method made it possible to produce porous polymeric membranes with different refractive indices by polymerization of different monomers and copolymerization of monomers. When a membrane with an open-cellular structure was immersed in a liquid, the transmitted light was observed at a wavelength where the refractive indices of the polymeric phase and the liquid matched. Angle-independent color derived from the scattered light could also be observed. When the porous membrane of poly(2-ethylhexyl methacrylate) (EHMA) was immersed in a mixture of different kinds of liquids, the maximum wavelength of the transmission (λmax) changed according to the refractive index matching of the polymeric phase and the liquid, resulting in the change in coloration. Next, when the P(EHMA-co-EGDMA) membrane was immersed in a mixture of toluene and d-limonene, λmax and color varied depending on their mixing ratios. This coloration was controlled by temperature and the refractive indices of the polymeric phase and the liquid. Furthermore, we could estimate the refractive index of PEGDMA using λmax values obtained by immersing it into liquids with different refractive indices.

  • Functionalization of keratin nanoparticles by their internal modifications

    Yuuka Fukui, Kaori Ito, Keiji Fujimoto

    Polymer Journal (Springer Nature)  54 ( 11 ) 1367 - 1375 2022.06

    Research paper (scientific journal), Joint Work, Corresponding author, Accepted,  ISSN  00323896

     View Summary

    We prepared keratin nanoparticles, which could respond to temperature and pH changes and to redox reactions, by electrostatic association of keratin and a cationic surfactant, dioctadecyl dimethyl ammonium chloride (DODAC). Solubilized keratin chains were assembled into nanoparticles (Ker-DODAC) and then crosslinked by disulfide formation. The resultant nanoparticles (Ker-DODACss) possessed a hydrophobic core composed of DODAC, enabling hydrophobic compounds to be loaed and retained in the core. By increasing the temperature, the fluidity of the core was increased, resulting in Ker-DODACss swelling and burst release of loaded compounds. Next, cholesterol was loaded into Ker-DODACss to modify the inner environment, such as the hydrophobicity and fluidity of the core. The nanoparticles (Ker-DODACss-Chol) exhibited reduced fluidity of the core and suppressed release of the payload. Furthermore, the release could be triggered by decreasing the electrostatic interaction between keratin and DODAC at pH values lower than 7.4. It was also found that Ker-DODACss-Chol possessed the ability to release payloads by breaking disulfide bonds. As a further internal modification, we incorporated a lipophilic antioxidant, α-tocopherol, into Ker-DODACss-Chol. It was confirmed that Ker-DODACss-Chol could act as a physical barrier to prevent α-tocopherol from undergoing oxidative degradation.

  • Preparation of a deformable nanocapsule by living radical polymerization in a liposome

    Fukui Y., Fukui A., Fujimoto K.

    Polymer Journal (Polymer Journal)  54 ( 7 ) 893 - 901 2022

    ISSN  00323896

     View Summary

    We aimed to prepare an elastic nanocapsule by internal modification of a liposome with living radical polymerization. First, monomers and photoiniferters were encapsulated in liposomes. Then, UV light irradiation was used to conduct living radical polymerization in the liposomes. The obtained nanocapsules showed good absorption and retention of chemical substances depending on the binding ability to the incorporated polymers, and the absorption capacity could be controlled by the length and dissolved state of the polymer chains. In addition, dynamic morphological changes in the capsules were observed when liposomes with high membrane fluidity were employed. Morphological changes in the nanocapsules were induced by altering the pH value and ionic strength, resulting in the release of cargo in response to these environmental conditions.

  • Preparation of agarose xerogel nanoparticles by solvent evaporation from water nanodroplets

    Fukui Y., Inamura R., Fujimoto K.

    Polymer Journal (Polymer Journal)  53 ( 7 ) 815 - 821 2021.07

    ISSN  00323896

     View Summary

    We developed a W/O miniemulsion reactor system enabling the preparation of biopolymer nanoparticles and control of their morphologies and inner microstructures. First, the W/O miniemulsion was prepared by suspending water nanodroplets containing agarose in oil. Then, we produced agarose hydrogel nanoparticles (AgarH) by the gelation of agarose in nanodroplets. Next, we prepared agarose xerogel nanoparticles (AgarX) by precisely tuning the water evaporation from AgarH. We controlled the morphologies (solid and hollow) and crystal structure of AgarX by changing the pressure and temperature during water evaporation. In fact, AgarX with a hollow structure was generated through rapid evaporation at a low pressure. AgarH was dissolved in Milli-Q water when the temperature was raised to 90 °C. On the other hand, AgarX remained a solid particle under the same conditions, likely because of its high crystallinity. We expect that this technique can be applied to prepare xerogels of diverse biomass-based polymers for the replacement of synthetic polymers.

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

Reviews, Commentaries, etc. 【 Display / hide

  • ミネラル層で覆われたリポナノカプセルの創製


    PHARM STAGE (技術情報協会 )  18 ( 5 )  2018.08

    Article, review, commentary, editorial, etc. (scientific journal), Single Work

  • 機能性高分子微粒子の合成と作製技術

    福井有香, 藤本啓二

    MATERIAL STAGE (技術情報協会 )  18 ( 2 ) 1 - 6 2018

    Article, review, commentary, editorial, etc. (scientific journal), Joint Work

Presentations 【 Display / hide

  • Preparation of ceramide-containing liponano-capsules by polymer deposition for versatile loading and self-degradation

    Yuuka Fukui, Junna Ito, Masatoshi Takeiri, Koki Hatayama, Yoshihide Kimura, Keiji Fujimoto

    72nd SPSJ Annual Meeting, 


    Oral presentation (general)

  • ミニエマルションを用いたゼラチンナノ粒子の創製と複合エマルション化による機能化

    三宅佑里, 福井有香, 藤本啓二



    Poster presentation

  • セルロースナノファイバーを用いた多孔質体の作製と導電性高分子の複合化




    Poster presentation

  • ミニエマルションを用いた脂肪酸系ナノ油滴の作製と薬剤の放出制御

    近藤聡一郎, 福井有香, 藤本啓二



    Poster presentation

  • バイオポリマーを用いたジャイアントリポソーム集積化膜の作製

    青木優美, 福井有香, 藤本啓二



    Poster presentation

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

  • 骨疾患治療のための骨環境応答性ナノツールの開発


    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Early-Career Scientists , Principal investigator

Awards 【 Display / hide

  • 第58回リバネス研究費 東洋紡高分子科学賞


    Type of Award: Award from publisher, newspaper, foundation, etc.

  • 2021年度Polymer Journal論文賞-日本ゼオン賞

    2022.05, 公益社団法人 高分子学会

    Type of Award: Award from Japanese society, conference, symposium, etc.

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  • The Young Investigator Award Gold Prize(11th Liposome Research Days Conference)

    FUKUI Yuuka, 2008.07, Preparation of Lipo-nanocapsules by the layer-by-layer deposition of polysaccharides and coating of calcium phosphate onto a liposome

    Type of Award: Award from Japanese society, conference, symposium, etc.


Courses Taught 【 Display / hide











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Memberships in Academic Societies 【 Display / hide

  • Materials Research Society, 

  • American Chemical Society, 

  • 日本バイオマテリアル学会, 

  • 高分子学会,