Details of the Researcher

PHOTO

Hikaru Namigata
Section
Graduate School of Engineering
Job title
Assistant Professor
Degree

  • Ph.D. (Tohoku University)

e-Rad No.
41001704

Research History 1

  • 2024/04 - Present
    Tohoku University　Graduate School of Engineering Department of Chemical Engineering

Education 3

  • Tohoku University　Graduate School of Engineering　Department of Chemical Engineering

    2021/04 - 2024/03

  • Tohoku University　Graduate School of Engineering　Department of Chemical Engineering

    2019/04 - 2021/03

  • Tohoku University　Faculty of Engineering　Department of Applied Chemistry, Chemical Engineering and Biomolecular Engineering

    2015/04 - 2019/03

Professional Memberships 2

  • 化学工学会

    2019/05 - Present

  • American Institute of Chemical Engineers

    2020/04 - Present

Research Interests 4

  • Hydrogels

  • yolk-shell

  • 微粒子集積

  • colloid

Research Areas 3

  • Nanotechnology/Materials / Nanomaterials /

  • Nanotechnology/Materials / Structural and functional materials /

  • Nanotechnology/Materials / Composite materials and interfaces /

Awards 5

  1. KIRAMEKI Award

    2026/03　一般財団法人 田中貴金属記念財団

  2. 優秀学生賞

    2022/03　化学工学会 第87年会　電場により光の反射強度を制御可能な可動コア内包型粒子集積体の開発

  3. 工学部長賞

    2019/03　東北大学工学部

  4. Outstanding Oral Presentation Award

    2019/12　2019 International Symposium on Chemical–Environmental–Biomedical Technology　Fabrication of non-close-packed colloidal crystals composed of hollow particles incorporating movable cores

  5. ポスター奨励賞

    2019/03　マテリアル・ファブリケーション・デザインセミナー　光触媒粒子の液中分散性向上に関する検討

Papers 17

  1. Surface Modification of Silica-Supported Supraparticles to Control Their Optical Properties and Mobility in Electric Fields

    Keisuke Kurioka, Natsuho Tsunetomi, Hikaru Namigata, Keishi Suga, Kanako Watanabe, Daisuke Nagao, Tom A. J. Welling

    Langmuir　2026/06/16

    DOI： 10.1021/acs.langmuir.6c00880 　

  2. Designing hollow-structured nanoreactors for effective use of catalytic nanoparticles by balancing mass transport and reaction kinetics

    Hana Aizawa, Tom A. J. Welling, Shin Saito, Hikaru Namigata, Keishi Suga, Kanako Watanabe, Daisuke Nagao

    CHEMICAL ENGINEERING JOURNAL　536　2026/05/15

    DOI： 10.1016/j.cej.2026.175913 　

    ISSN： 1385-8947

    eISSN： 1873-3212

  3. Moderately clustered gold nanoparticles preserved in in-situ polymerized hydrogels towards facile SERS sensing

    Hikaru Namigata, Kanako Watanabe, Tom A. J. Welling, Keishi Suga, Daisuke Nagao

    COLLOID AND POLYMER SCIENCE　2026/01/20

    DOI： 10.1007/s00396-026-05568-y 　

    ISSN： 0303-402X

    eISSN： 1435-1536

  4. Molecular Enrichment in the Cavity of Hollow Mesoporous Silica Particles: the Effect of the Cavity Size

    Shin Saito, Hana Aizawa, Kanako Watanabe, Tom A. J. Welling, Hikaru Namigata, Keishi Suga, Daisuke Nagao

    Particle & Particle Systems Characterization　2025/11/23

    DOI： 10.1002/ppsc.202500188 　

    ISSN： 0934-0866

    eISSN： 1521-4117

  5. Effects of mesoporous silica particle loading on the properties of PDMS-based mixed matrix membrane

    Tomoya Yoshihara, Keishi Suga, Hikaru Namigata, Kanako Watanabe, Tom A.J. Welling, Kumiko Hayashi, Lester C. Geonzon, Koichi Mayumi, Daisuke Nagao

    Chemical Engineering Journal Advances　2025/08

    DOI： 10.1016/j.ceja.2025.100803 　

    ISSN： 2666-8211

  6. Supraparticles with Tailored Absorption and Their Optical Performance as Photonic Pigments in Sustainable Water-Based Paint

    Tom A. J. Welling, Keisuke Kurioka, Gantulga Tuguldur, Natsuho Tsunetomi, Hikaru Namigata, Keishi Suga, Kanako Watanabe, Daisuke Nagao

    ACS Applied Optical Materials　2025/04/17

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acsaom.5c00080 　

    ISSN： 2771-9855

    eISSN： 2771-9855

  7. Visualization of the packing structure of packed beds with micron-sized particles using confocal microscopy to estimate their pressure drop

    Nishida, H., Welling, T.A.J., Namigata, H., Hiromori, K., Suga, K., Nagao, D., Watanabe, K.

    Chemical Engineering Journal　515　2025

    DOI： 10.1016/j.cej.2025.163519 　

    ISSN： 1385-8947

  8. A practical process for effective thickening of silica shells formed onto spherical cores by considering the variation in ionic strength during sol-gel reaction

    Kanako Watanabe, Ryuto Fujinuma, Hana Aizawa, Hikaru Namigata, Tom A.J. Welling, Keishi Suga, Daisuke Nagao

    Microporous and Mesoporous Materials　379　113274-113274　2024/11

    Publisher: Elsevier BV

    DOI： 10.1016/j.micromeso.2024.113274 　

    ISSN： 1387-1811

  9. Colloidal photonic crystals with tunable reflection wavelengths or intensities derived from their reconfigurable structures

    Hikaru Namigata, Kanako Watanabe, Tom A.J. Welling, Keishi Suga, Daisuke Nagao

    Colloid and Interface Science Communications　62　100806-100806　2024/09

    Publisher: Elsevier BV

    DOI： 10.1016/j.colcom.2024.100806 　

    ISSN： 2215-0382

  10. Bio‐Inspired Polydiacetylene Vesicles for Controlling Stimulus Sensitivity

    Shota Nakayama, Keishi Suga, Tatsuya Kamata, Kanako Watanabe, Hikaru Namigata, Tom A. J. Welling, Daisuke Nagao

    Macromolecular Reaction Engineering　2024/07/29

    Publisher: Wiley

    DOI： 10.1002/mren.202400016 　

    ISSN： 1862-832X

    eISSN： 1862-8338

    More details Close

    Abstract Polydiacetylene (PDA) is a kind of photopolymerizable polymer, which exhibits a unique color transition in response to external stimuli such as heat, pH, and solvent. PDAs are attractive as eye‐detection stimulus sensors with excellent time performance; however, the sensitivity of PDAs should be improved. Considering the biological membrane‐like structure of diacetylene (DA) vesicles, their modification by incorporating membrane lipids (e.g., diacylphosphocholine, PC) can be used to control the membrane fluidity, and consequently molecular ordering of DAs in the vesicle. Inspired by biological membrane systems, lipid vesicles are employed as platforms to generate PDA, and essential factors that influence the sensitivity of PDA are investigated. By lowering the polymerization temperature, the generation of PDA becomes slower, while the sensitivity improves. By adding PCs at the molar ratio of lipid:DA = 1:1, the sensitivity of PDA can be varied: the PCs with lower phase transition temperatures (Tm) made PDA insensitive, while the PCs with higher Tm improved the sensitivity as compared to pure poly(PCDA). It is concluded that the photopolymerization of DAs with a lower membrane fluidity induces highly sensitive PDA, while the photopolymerization of DAs with a higher membrane fluidity induces insensitive PDA with robustness toward stimuli.

  11. Probing Ion Diffusion and Ion Sieving through Hollow Porous Silica Shells by Imaging the Mobility of Colloids Inside the Shells

    Kanako Watanabe, Tom A. J. Welling, Rafael G. Mendes, Zahra Peimanifard, Maarten Bransen, Hikaru Namigata, Marijn A. van Huis, Daisuke Nagao, Alfons van Blaaderen

    Advanced Materials Interfaces　2024/06/29

    Publisher: Wiley

    DOI： 10.1002/admi.202400333 　

    ISSN： 2196-7350

    eISSN： 2196-7350

    More details Close

    Abstract Ionic transport through porous membranes and porous materials has received enormous attention due to its importance to many applications. An innovative methodology is proposed to study ion diffusion and ion sieving through mesoporous silica membranes (shells). The mobility of fluorescently labeled core particles within a hollow porous shell, filled with an index‐matched electrolyte solution, is observed using confocal laser scanning microscopy. The core motion range, i.e., the area explored by the core within the hollow compartment, sensitively changed depending on the local ionic concentration. Monitoring transitions in the core motion range is a practical way to detect which ions can migrate through the shells and on what timescale. For instance, lithium and chloride ions easily diffused through the porous silica shells, resulting in a core motion range that changed relatively quickly upon change of the ion concentrations outside of the shell. However, the motion range changed significantly slower upon changing to a bigger cation (tetraoctylammonium ion). This proof of principle experiment can be explained by the Gibbs‐Donnan effect, revealing that the detection of core motion ranges is a good probe to measure both ion diffusion and ion sieving through porous membranes.

  12. Double-inverse-opal structured films of a hydrogel framework and mobile inorganic particles

    Namigata, H., Watanabe, K., Welling, T.A.J., Suga, K., Nagao, D.

    Colloids and Surfaces A: Physicochemical and Engineering Aspects　690　2024/06

    DOI： 10.1016/j.colsurfa.2024.133781 　

    ISSN： 1873-4359 0927-7757

  13. Highly Reflective and Transparent Shell-Index-Matched Colloidal Crystals of Core-Shell Particles for Stacked RGB Films

    Welling, T.A., Kurioka, K., Namigata, H., Suga, K., Nagao, D., Watanabe, K.

    ACS Applied Nano Materials　7　(16)　2024

    DOI： 10.1021/acsanm.3c03940 　

    ISSN： 2574-0970

  14. Switchable Bragg Reflections via Controllable Inner Particle Motion in Yolk-Shell Colloidal Crystals

    Namigata, H., Welling, T.A.J., Watanabe, K., Suga, K., Imhof, A., van Blaaderen, A., Nagao, D.

    ACS Applied Optical Materials　2　(1)　2024

    DOI： 10.1021/acsaom.3c00392 　

    ISSN： 2771-9855

  15. Surface lattice resonance in three-dimensional plasmonic arrays fabricated via self-assembly of silica-coated gold nanoparticles

    Hasegawa, M., Watanabe, K., Namigata, H., Welling, T.A.J., Suga, K., Nagao, D.

    Journal of Colloid and Interface Science　633　2023

    DOI： 10.1016/j.jcis.2022.11.077 　

    ISSN： 1095-7103 0021-9797

  16. Double-inverse-opal-structured particle assembly as a novel immobilized photocatalytic material

    Namigata, H., Watanabe, K., Okubo, S., Hasegawa, M., Suga, K., Nagao, D.

    Materials　14　(1)　2021

    DOI： 10.3390/ma14010028 　

    ISSN： 1996-1944

  17. Polymer-coating of photocatalytic particles to prevent sintering in their calcination process

    Namigata, H., Watanabe, K., Okubo, S., Nagao, D.

    Colloids and Surfaces A: Physicochemical and Engineering Aspects　599　2020

    DOI： 10.1016/j.colsurfa.2020.124782 　

    ISSN： 1873-4359 0927-7757

Show all ︎Show first 5

Misc. 1

  1. 化学工学年鑑2024 13章 材料・界面 13.4 ソフトマター工学

    波形光, 長尾大輔

    化学工学　88　(10)　2024/10

Presentations 34

  1. ハイドロゲルを利用した微粒子集積構造の安定化

    波形光

    化学工学会 第91年会　2026/03/17

  2. Gold nanoparticle clusters stabilized in a hydrogel film for highly sensitive SERS substrates

    Hikaru Namigata, Kanako Watanabe, Tom A. J. Welling, Keishi Suga, Daisuke Nagao

    2025 AIChE Annual Meeting　2025/11/04

  3. Colloidal photonic crystals with dynamically reconfigurable structures Invited

    波形光

    令和7年度化学系学協会東北大会　2025/09/06

  4. コア-シェル型ナノ粒子の内包コア粒子数制御プロセスの検討

    藤野 維恩, 渡部 花奈子, 波形 光, Tom Welling, 菅 恵嗣, 長尾 大輔

    化学工学会 第90年会　2025/03/14

  5. ハイドロゲルのin-situ重合を利用した金ナノ粒子凝集状態の制御と表面増強ラマン分光基板への応用

    波形 光, 渡部 花奈子, Tom Welling, 菅 恵嗣, 長尾 大輔

    化学工学会 第90年会　2025/03/13

  6. Enhanced Gas Permeability of Polymer Membrane Incorporating Mesoporous Silica Particles

    Tomoya Yoshihara, Keishi Suga, Hikaru Namigata, Kanako Watanabe, Daisuke Nagao

    15th Korea-Japan Symposium on Materials and Interfaces　2024/11/28

  7. The relationship between morphological factors and adsorption capacity of hollow mesoporous silica particles

    Shin Saito, Hana Aizawa, Kanako Watanabe, Tom A. J. Welling, Hikaru Namigata, Keishi Suga, Daisuke Nagao

    15th Korea-Japan Symposium on Materials and Interfaces　2024/11/28

  8. Hollow mesoporous silica particles as a catalytic support: the effect of particle structure on catalytic performance

    Hana Aizawa, Shin Saito, Kanako Watanabe, Hikaru Namigata, Tom A. J. Welling, Keishi Suga, Daisuke Nagao

    15th Korea-Japan Symposium on Materials and Interfaces　2024/11/28

  9. Three-dimensionally ordered assemblies of yolk–shell particles with controllable regularity by electric field-assisted cores’ motion

    Hikaru Namigata, Tom A. J. Welling, Kanako Watanabe, Keishi Suga, Daisuke Nagao

    2024 AIChE Annual Meeting　2024/10/30

  10. 電場印加による微粒子運動の変化を利用したコロイド結晶の秩序性制御

    波形 光, 渡部 花奈子, Tom Welling, 菅 恵嗣, 長尾 大輔

    第75回コロイドおよび界面化学討論会　2024/09/19

  11. 中空多孔質シリカ粒子への分子吸着特性向上に寄与する粒子形態因子の検討

    齋藤 迅, 相澤 花, 渡部 花奈子, Tom Welling, 波形 光, 菅 恵嗣, 長尾 大輔

    第75回コロイドおよび界面化学討論会　2024/09/19

  12. Poly(N-isopropylacrylamide) hydrogel films incorporating mobile colloidal particles towards smart responsive materials

    Hikaru Namigata, Kanako Watanabe, Tom A. J. Welling, Keishi Suga, Daisuke Nagao

    The 7th Asian Symposium on Emulsion Polymerization and Functional Polymeric Microspheres　2024/07/20

  13. 光反射特性をスイッチング可能な新規コロイド材料の開発と博士課程を通して学んだこと Invited

    波形光

    第19回日本セラミックス協会マテリアル・ファブリケーション＆プロダクション・デザイン研究会

  14. Rational design for structural color materials Invited

    Tom A.J. Welling, Keisuke Kurioka, Hikaru Namigata, Keishi Suga, Kanako Watanabe, Daisuke Nagao

    SCEJ 89th Annual Meeting

  15. Hollow-type mesoporous silica particles for removal of organic dyes from aqueous solution International-presentation

    Hana Aizawa, Shin Saito, Hikaru Namigata, Kanako Watanabe, Keishi Suga, Daisuke Nagao

    The 12th International Conference on Separation Science and Technology

  16. Double-inverse-opal structured assemblies of titania-based photocatalytic particles towards continuous water purification process International-presentation

    Hikaru Namigata, Kanako Watanabe, Keishi Suga, Daisuke Nagao

    2023 AIChE Annual Meeting

  17. Electrically responsive yolk-shell colloidal photonic crystals with controllable coherent scattering intensities International-presentation International-coauthorship

    Hikaru Namigata, Tom A.J. Welling, Kanako Watanabe, Keishi Suga, Arnout Imhof, Alfons van Blaaderen, Daisuke Nagao

    2023 AIChE Annual Meeting

  18. 中空多孔質粒子内部のコロイド運動を利用した分子拡散モニタリング

    渡部花奈子, Tom A.J. Welling, 波形光, 菅恵嗣, 長尾大輔

    化学工学会第54回秋季大会

  19. 電場により誘起されるコロイド粒子の集団振動を利用した粒子配列構造の制御

    波形光, Tom A.J. Welling, 渡部花奈子, 菅恵嗣, 長尾大輔

    化学工学会第54回秋季大会

  20. Effect of shell structure of hollow silica particles on molecular diffusion from bulk liquid phase

    Hana Aizawa, Hikaru Namigata, Kanako Watanabe, Keishi Suga, Daisuke Nagao

    International Symposium for the 80th Anniversary of the Tohoku Branch of the Chemical Society of Japan

  21. Frequency-controlled mobility of the inner particle in yolk-shell structures for use in switchable colloidal crystals International-presentation International-coauthorship

    Tom A.J. Welling, Kanako Watanabe, Albert Grau-Carbonell, Hikaru Namigata, Daisuke Nagao, Arnout Imhof, Joost de Graaf, Marijn A. van Huis, Alfons van Blaaderen

    37th conference of European Colloid & Interface Society

  22. 触媒担体応用に適した中空シリカ粒子のシェル構造設計

    相澤花, 波形光, 渡部花奈子, 菅恵嗣, 長尾大輔

    化学工学会山形大会2023

  23. 電場印加により集合的規則運動が誘起されるコロイド配列体の光学特性制御

    波形光

    材料化学システム工学討論会2022

  24. Colloidal crystals from rattle-type particles with control over the Bragg scattering strength using an external AC electric field International-presentation International-coauthorship

    Hikaru Namigata, Tom A. J. Welling, Keishi Suga, Marijn A. van Huis, Alfons van Blaaderen, Daisuke Nagao, Kanako Watanabe

    11th International Colloid Conference

  25. Interactions within rattle-type particles with and without an AC electric field for use in switchable photonic colloidal crystal International-presentation International-coauthorship

    Tom A.J. Welling, Hikaru Namigata, Kanako Watanabe, Daisuke Nagao, Joost de Graaf, Marjin van Huis, Alfons van Blaaderen

    11th International Colloid Conference

  26. 電場により光の反射強度を制御可能な可動コア内包型粒子集積体の開発

    波形光, 渡部花奈子, 菅恵嗣, 長尾大輔

    化学工学会第87年会

  27. 光触媒反応のための階層的なチタニア複合材料の作製

    辻大輝, 波形光, 渡部花奈子, 菅恵嗣, 長尾大輔

    第23回化学工学会学生発表会

  28. Design of Photocatalytic Particle Assemblies Applicable to a Continuous Water Purification Process International-presentation International-coauthorship

    Hikaru Namigata, Kanako Watanabe, Saya Okubo, Keishi Suga, Daisuke Nagao

    2020 Virtual AIChE Annual Meeting

  29. 動的な性質を有する 3次元粒子配列体作製に向けたコア内包型中空粒子の設計

    波形光, 渡部花奈子, 菅恵嗣, 長尾大輔

    化学工学会第51回秋季大会

  30. Fabrication of non-close-packed colloidal crystals composed of hollow particles incorporating movable cores International-presentation

    Hikaru Namigata, Kanako Watanabe, Eri Tanaka, Daisuke Nagao

    2019 International Symposium on Chemical–Environmental–Biomedical Technology

  31. Influences of dispersibility and crystallinity on photocatalytic activity of titania particles International-presentation

    Hikaru Namigata; Kanako Watanabe; Saya Okubo; Daisuke Nagao

    Okinawa Colloids 2019

  32. 結晶性微粒子の液中分散性向上プロセスの検討

    波形光, 大久保沙耶, 渡部花奈子, 長尾大輔

    第21回先端研究発表会

  33. 光触媒粒子の液中分散性向上に関する検討

    波形光; 大久保沙耶; 渡部花奈子; 石井治之; 長尾大輔

    マテリアル・ファブリケーション・デザインセミナー

  34. Photocatalytic activity of titania particles incorporated into hollow interiors formed by silica shell International-presentation

    Hikaru Namigata; Kanako Watanabe; Saya Okubo; Haruyuki Ishii; Daisuke Nagao

    13th Korea–Japan Symposium on Materials and Interfaces

Show all Show first 5

Research Projects 3

  1. ハイドロゲルを活用したナノ粒子のクラスター生成・精製のための新手法開発

    波形 光

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 若手研究

    Institution: 東北大学

    2025/04/01 - 2028/03/31

  2. 「卵型」の構造を有したフォトニック結晶による光反射特性の動的制御への挑戦

    Offer Organization: 公益財団法人 池谷科学技術振興財団

    System: 単年度研究助成

    2025/04 - 2026/03

  3. 外部刺激に応じて集合的コロイド運動が誘起される粒子配列体による音調可視化への挑戦

    波形 光

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 特別研究員奨励費

    Institution: 東北大学

    2023/03/08 - 2024/03/31

    More details Close

    本研究では、中空のシェルと可動性のコア粒子からなる卵型粒子を用いて規則配列体を作製し、その光学特性を外部からの刺激によって変化させることを目的とする。本年度は、(1) 卵型粒子のコア粒子サイズ及び周囲の電解質濃度が光学特性に及ぼす影響の検討、(2) 粒子配列体の間隙への骨格成分導入による配列構造の安定化について検討した。 (1) について、コア粒子がシェル内部で動くことのできる範囲はコアとシェル内壁間の静電的な相互作用に基づいて決まる。そこで、コアの小粒径化または電解質の添加により静電相互作用を弱めることでコアの可動域を拡大させた。種々の条件に調整した卵型粒子について、コア粒子の運動を共焦点レーザー顕微鏡で観察したところ、コアのサイズが小さいかつ周囲の電解質濃度が高い場合にコアの可動域が拡大することが確かめられた。さらに、それらの規則配列体について電場有/無で光の反射スペクトルを測定すると、コア粒子の可動域が大きいほど無電場時に配列構造が乱雑となり、反射ピーク強度が低下することがわかった。一方ですべての配列体について電場印加時には粒子配列が規則的となり、反射ピーク強度は向上した。以上の検討により、コアサイズおよび周囲の電解質濃度を調節することで卵型粒子配列体の光学特性の制御性が向上することが明らかとなった。 (2) について、現行の手法では卵型粒子は水中で規則構造を形成しており、振動等の刺激によりその構造が崩壊し得ることが確認されている。そこで骨格となる成分を卵型粒子配列体の間隙に充填し、配列構造を補強する手法について検討を行った。令和4年度は主に骨格成分としてシリカを検討してきたが、次年度はアクリル系の有機ポリマーを用いる手法についても検討する。これにより、骨格由来の光散乱の低減や、熱、振動や引張といった新たな外部刺激による光学特性制御能の獲得を目指す。