Study on spatio-temporal structures of exotic colloids

• Project/Area Number: 25610125
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Biological physics/Chemical physics/Soft matter physics
• Research Institution: Kyushu University
• Principal Investigator: KIMURA YASUYUKI 九州大学, 理学(系)研究科(研究院), 教授 (00225070)
• Co-Investigator(Renkei-kenkyūsha): ANNAKA Masahiko 九州大学, 大学院理学研究院, 教授 (40282446)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 異方性コロイド / コロイド構造体 / 楕円体粒子 / ネマチックコロイド / コロイド / 配向秩序 / 液晶コロイド / 光ピンセット / ３次元観察 / ガラス / 準結晶

Outline of Final Research Achievements

We have experimentally studied the structures which anisotropic colloidal particles exhibit in this project.
The structures observed in concentrated two-dimensional colloidal dispersion of ellipsoidal particles with various axial ratio have been analyzed from the aspect of their translational and orientational order. The long-ranged translational order has not been observed in all systems we studied. The short-ranged translational order reduces and the orietational one enhances with increase of the degree of elongation.
In the spherical colloidal system dispersed in nematic liquid crystal, so-called nematic colloids, the interaction between them is anisotropic. We have formed various complex assemblies including dendric ones and open oblique crystal those cannot be realized in conventional colloidal system by manipulating the particles by optical tweezers.

Research Products

• [Journal Article] Melting process of a single finite-sized two-dimensional colloidal crystal (2014)
  • Author(s): Sayuri Tanaka, Yuma Oki and Yasuyuki Kimura
  • Journal Title: Physical Review E Volume: 89 Issue: 5
  • DOI: 10.1103/physreve.89.052305
  • Peer Reviewed
• [Journal Article] Measurement of interparticle force between nematic colloids (2014)
  • Author(s): Yasuyuki Kimura and Kuniyoshi Izaki
  • Journal Title: SPIE2014 proceeding Volume: 2064 Pages: 91640O-91640O
  • DOI: 10.1117/12.2064322
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] ヤヌス粒子の2次元分散系における凝集構造 (2014)
  • Author(s): 岩下靖孝，木村康之
  • Journal Title: 日本物理学会誌 Volume: 69 Pages: 213-217
  • Peer Reviewed / Open Access
• [Journal Article] Melting of a finite-sized two-dimensional colloidal crystal (2014)
  • Author(s): Sayuri Tanaka, Yuma Oki and Yasuyuki Kimura
  • Journal Title: PHYSICAL REVIEW E Volume: 89
  • Peer Reviewed
• [Journal Article] Stable cluster phase of Janus particles in two dimensions (2013)
  • Author(s): Yasutaka Iwashita and Yasuyuki Kimura
  • Journal Title: Soft Matter Volume: 9 Issue: 45 Pages: 10694-10698
  • DOI: 10.1039/c3sm52146j
  • Peer Reviewed
• [Presentation] ネマチック液晶中でのコロイド構造体の作製 (2015)
  • Author(s): 田村優太，木村康之，岩下靖孝
  • Organizer: 第７０回日本物理学会年次大会
  • Place of Presentation: 早稲田大学・東京都新宿区
  • Year and Date: 2015-03-21 – 2015-03-24
• [Presentation] ネマチックコロイド結晶の作製 (2014)
  • Author(s): 田村優太, 河村隆弘, 岩下靖孝, 木村康之
  • Organizer: 第120回日本物理学会九州支部例会
  • Place of Presentation: 崇城大学・熊本市
  • Year and Date: 2014-12-06
• [Presentation] 様々な軸比の楕円体粒子が作る構造 (2014)
  • Author(s): 松元大吾, 岩下靖孝, 木村康之
  • Organizer: 第120回日本物理学会九州支部例会
  • Place of Presentation: 崇城大学・熊本市
  • Year and Date: 2014-12-06
• [Presentation] 楕円コロイド粒子系が示す構造 (2014)
  • Author(s): 松元大吾，岩下靖孝，木村康之
  • Organizer: 日本物理学会2014年秋季大会
  • Place of Presentation: 中部大学・春日井市
  • Year and Date: 2014-09-07 – 2014-09-10
• [Presentation] Interparticle force between nematic colloids (2014)
  • Author(s): Yasuyuki Kimura and Kuniyoshi Izaki
  • Organizer: International Conference in Asia (IUMRS-ICA) 2014
  • Place of Presentation: Fukuoka, Japan
  • Year and Date: 2014-08-24 – 2014-08-28
• [Presentation] Measurement of interparticle force between nematic colloids (2014)
  • Author(s): Yasuyuki Kimura and Kuniyoshi Izaki
  • Organizer: SPIE2014, Optical Trapping and Optical Micromanipulation XI
  • Place of Presentation: San Diego, U.S.A.
  • Year and Date: 2014-08-17 – 2014-08-21
• [Presentation] Melting of an Isolated Two-dimensional Colloidal Crystal (2013)
  • Author(s): Sayuri Tanaka and Yasuyuki Kimura
  • Organizer: International Soft Matter Conference 2013
  • Place of Presentation: University of Roma (Italy)
• [Presentation] 有限サイズの二次元コロイド結晶の消滅過程 (2013)
  • Author(s): 田中小百合、木村康之
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 徳島大学（徳島市）
• [Presentation] 楕円粒子を用いた構造形成 (2013)
  • Author(s): 松元大吾、木村康之
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 徳島大学（徳島市）
• [Presentation] 球と楕円粒子からなるコロイド系の構造 (2013)
  • Author(s): 松元大吾、木村康之
  • Organizer: 第119回日本物理学会九州支部例会
  • Place of Presentation: 久留米工業大学(久留米市)
• [Presentation] 有限サイズの二次元コロイド結晶の研究 (2013)
  • Author(s): 田中小百合、木村康之
  • Organizer: 第119回日本物理学会九州支部例会
  • Place of Presentation: 久留米工業大学(久留米市)
• [Presentation] 球と楕円からなるコロイド系の構造 (2013)
  • Author(s): 松元大吾、木村康之
  • Organizer: 第3回ソフトマター研究会
  • Place of Presentation: 首都大学東京国際交流会館(八王子市)
• [Presentation] 有限サイズの二次元コロド凝集体融解の研究 (2013)
  • Author(s): 田中小百合、木村康之
  • Organizer: 第3回ソフトマター研究会
  • Place of Presentation: 首都大学東京国際交流会館(八王子市)
• [Remarks] 研究者情報（木村康之）
  • URL: http://hyoka.ofc.kyushu-u.ac.jp/search/details/K002560/research.html