非平衡定常状態におけるソフトマターのゆらぎとレオロジー

• Project Area: Synergy of Fluctuation and Structure:Foundation of Universal Laws in Nonequilibrium Systems
• Project/Area Number: 25103006
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Research Institution: Hokkaido University
• Principal Investigator: 折原 宏 北海道大学, 工学(系)研究科(研究院), 教授 (30177307)
• Co-Investigator(Kenkyū-buntansha): 長屋 智之 大分大学, 工学部, 教授 (00228058) ; 中垣 俊之 北海道大学, 電子科学研究所, 教授 (70300887) ; 佐藤 勝彦 北海道大学, 電子科学研究所, 准教授 (90513622)
• Project Fiscal Year: 2013-06-28 – 2018-03-31
• Project Status: Granted(Fiscal Year 2016)
• Budget Amount: ¥68,380,000 (Direct Cost : ¥52,600,000、Indirect Cost : ¥15,780,000); Fiscal Year 2016 : ¥9,620,000 (Direct Cost : ¥7,400,000、Indirect Cost : ¥2,220,000); Fiscal Year 2015 : ¥15,730,000 (Direct Cost : ¥12,100,000、Indirect Cost : ¥3,630,000); Fiscal Year 2014 : ¥15,860,000 (Direct Cost : ¥12,200,000、Indirect Cost : ¥3,660,000); Fiscal Year 2013 : ¥27,170,000 (Direct Cost : ¥20,900,000、Indirect Cost : ¥6,270,000)
• Keywords: ソフトマター物理 / 非平衡ゆらぎ / レオロジー / せん断流 / 流体 / 液晶 / ブラウン運動

Outline of Annual Research Achievements

１．「せん断流下におけるネマチック液晶の異常応力応答」
せん断流により時間反転対称性が破れた非平衡定常系は平衡系にはない特徴的なダイナミクスを示す。ネマチック液晶では交流電場に対して特異な応力応答が実験的に観測されていたが、今回定常せん断流に加えて直流電場も印加し、さらに微小な交流電場を印加したときの応力の応答を観測した。定常せん断流下では液晶分子はせん断面内で流れ方向と一定の角度をなしているが、交流電場を印加すると分子の方向が変化し、それにより応力も変化する。直流電場を変えたときの応力応答の交流電場周波数依存性を観測した。直流電場が小さいときはデバイ型であるが、大きくなるにつれて高周波側の実部の値がゼロから大きくなり、プラトーが現れることが分った。高周波側で応答が持続するのは希な現象である。本研究では液晶の基礎理論であるエリクセン・レスリー方程式からこの結果を再現できることを示した。この現象はオンサーガーの相反関係とも関係していることを示すことができる。
２． 「液晶電気対流中におけるコロイド粒子のダイナミクス」
流体中の微小物体の輸送は、ドラッグデリバリー、平衡から離れたアクティブマター、ラボ・オン・チップ等の科学分野において広く必要とされている。ここでは、液晶電気対流（EHC）を用いたネマチック液晶中の単体のコロイド粒子および鎖状に繋がったコロイドチェインの運動を調べた。コロイド回りのダイレクターの非対称な配向は、コロイド粒子においてはEHC中の一方向へのホッピングを、コロイドチェインに対してはロール軸に垂直な方向に芋虫のような運動をもたらすことを見出した。コロイドチェインを微小荷物の牽引エンジンとして使えることを例証した。

Current Status of Research Progress

Research has progressed on the whole more than it was originally planned.

Reason

昨年度に引き続き、液晶およびコロイド系を対象とし、非平衡ゆらぎおよび応答の測定を行ない、新たな現象を見出すとともにその理論的な解明も進んでいる。

Research Output

• [Journal Article] Stepwise heat-capacity change at an orientation transition in liquid crystals (2014)
  • Author(s): Satoshi Aya, Yuji Sasaki, Damian Pociecha, Fumito Araoka, Ewa Gorecka, Kenji Ema, Igor Musevic, Hiroshi Orihara, Ken Ishikawa, and Hideo Takezoe
  • Journal Title: Physical Review E Volume : 89 Pages : 022512/1-5
  • DOI: 10.1103/PhysRevE.89.022512
• [Journal Article] Electrically induced deformation in chiral smectic elastomers with different domain structures (2014)
  • Author(s): Yang Ho Na, Yuki Aburaya, Hiroshi Orihara, Kazuyuki Hiraoka, and Youngbae Han
  • Journal Title: Physical Review E Volume : 90 Pages : 062507/1-6
  • DOI: 10.1103/PhysRevE.90.062507
• [Journal Article] Colloidal caterpillars for cargo transportation (2014)
  • Author(s): Yuji Sasaki, Yoshinori Takikawa, V. S. R. Jampani, Hikaru Hoshikawa, Takafumi Seto, Christian Bahr, Stephan Herminghaus, Yoshiki Hidaka, and Hiroshi Orihara
  • Journal Title: Soft Matter Volume : 10 Pages : 8813-8820
  • DOI: 10.1039/C4SM01354A
• [Journal Article] Nonequilibrium steady-state response of a nematic liquid crystal under simple shear flow and electric fields (2014)
  • Author(s): Jaka Fajar Fatriansyah, Yuji Sasaki, and Hiroshi Orihara
  • Journal Title: Physical Review E Volume : 90 Pages : 032504/1-8
  • DOI: 10.1103/PhysRevE.90.032504
• [Journal Article] Chaos and Spatiotemporal Chaos in Convective Systems (2014)
  • Author(s): Yoshiki Hidaka and Noriko Oikawa
  • Journal Title: FORMA Volume : 29 Pages : 29-32
• [Journal Article] Functional Roles of Noise in Nonlinear Nonequilibrium Systems (2014)
  • Author(s): Yoshiki Hidaka
  • Journal Title: JPSJ News and Comments Volume : 11 Pages : 10-11
• [Journal Article] Attempts to retreat from a dead-ended long capillary by backward swimming in Paramecium (2014)
  • Author(s): Itsuki Kunita, Shigeru Kuroda, Kaito Ooki, Toshiyuki Nakagaki
  • Journal Title: Frontiers in Microbiology Volume : 5 Pages : 1-8
  • DOI: 10.3389/fmicb.2014.00270
• [Journal Article] Dynamical properties of nematic liquid crystals subjected to shear flow and magnetic fields: Tumbling instability and non-equilibrium fluctuations (2013)
  • Author(s): Jaka Fajar Fatriansyah and Hiroshi Orihara
  • Journal Title: Physival Review E Volume : 88 Pages : 012510/1-9
  • DOI: 10.1103/PhysRevE.88.012510
• [Journal Article] Duality of diffusion dynamics in particle motion in soft-mode turbulence (2013)
  • Author(s): Masaru Suzuki, Hiroshi Sueto, Yusaku Hosokawa, Naoyuki Muramoto, Takayuki Narumi, Yoshiki Hidaka, and Shoichi Kai
  • Journal Title: Physical Review E Volume : 88 Pages : 42147/1-7
  • DOI: 10.1103/PhysRevE.88.042147
• [Journal Article] Persistence of Brownian motion in shear flow (2013)
  • Author(s): Yoshinori Takikawa and Hiroshi Orihara
  • Journal Title: Physical Review E Volume : 88 Pages : 062111/1-5
  • DOI: 10.1103/PhysRevE.88.062111
• [Presentation] Numerical Studies of Stochastic Resonance in a Liquid Crystal Light Valve with Optical Feedback (2015)
  • Author(s): Yoshitomo Goto, Shugo Nukita, and Tomoyuki Nagaya
  • Organizer: The 2nd Asian Conference on Liquid Crystals
  • Place of Presentation: Busan, Korea
  • Year and Date: 2015-01-19 – 2015-01-21
• [Presentation] Apparent Viscosity and Stripe Structure of a Mixture of MBBA and EBCA (2015)
  • Author(s): Tomoyuki Nagaya, Yuki Satou, Yoshitomo Goto, Yoshiki Hidaka, and Hiroshi Orihara
  • Organizer: The 2nd Asian Conference on Liquid Crystals
  • Place of Presentation: Busan, Korea
  • Year and Date: 2015-01-19 – 2015-01-21
• [Presentation] Response of Nematic Liquid Crystal under Simple Shear Flow and Electric Field (2014)
  • Author(s): Jaka Fajar Fatriansyah, Yuji Sasaki, and Hiroshi Orihara
  • Organizer: International Union of Materials Research Societies – The IUMRS International Conference in Asia 2014
  • Place of Presentation: Fukuoka, Japan
  • Year and Date: 2014-08-24 – 2014-08-30
• [Presentation] Three-dimensional characterization of particle transport in nematic liquid crystal (2014)
  • Author(s): Yuji Sasaki, Yoshinori Takikawa, V. S. R. Jampani, Hikaru Hoshikawa, Takafumi Seto, Christian Bahr, Stephan Herminghaus, Yoshiki Hidaka and Hiroshi Orihara
  • Organizer: International Union of Materials Research Societies – The IUMRS International Conference in Asia 2014
  • Place of Presentation: Fukuoka, Japan
  • Year and Date: 2014-08-24 – 2014-08-30
• [Presentation] Rheology of Electro-Hydrodynamic Convection in a Liquid Crystal Mixture (2014)
  • Author(s): Yuki Satou, Hiroyuki Kuki, Yoshitomo Goto, Tomoyuki Nagaya, Yoshiki Hidaka, and Hiroshi Orihara
  • Organizer: International Union of Materials Research Societies – The IUMRS International Conference in Asia 2014
  • Place of Presentation: Fukuoka, Japan
  • Year and Date: 2014-08-24 – 2014-08-30
• [Presentation] Shear Stress Response of Nematic Liquid Crystal to an AC Electric Field under Shear Flow and DC Electric Fields (2014)
  • Author(s): Jaka Fajar Fatriansyah, Yuji Sasaki, and Hiroshi Orihara
  • Organizer: 6th Pacific Rim Conference on Rheology
  • Place of Presentation: Melbourne, Australia
  • Year and Date: 2014-07-20 – 2014-07-25
• [Presentation] Shear Banding in an F-Actin Solution (2014)
  • Author(s): Yoshinori Takikawa, Hiroshi Orihara, Katsuhiko Sato, Yoshimi Tanaka, Itsuki Kunita, Toshiyuki Nakagaki
  • Organizer: 6th Pacific Rim Conference on Rheology
  • Place of Presentation: Melbourne, Australia
  • Year and Date: 2014-07-20 – 2014-07-25
• [Presentation] Three-Dimensional Structure and Rheology of ER Suspension Subjected to a Step Electric Field (2014)
  • Author(s): Hiroshi Orihara, Jyunki Nagata, Yang Ho Na, So Young Kim, Hyoung Jin Choi
  • Organizer: 6th Pacific Rim Conference on Rheology
  • Place of Presentation: Melbourne, Australia
  • Year and Date: 2014-07-20 – 2014-07-25
• [Presentation] Three dimensional tracking of particles in electrohydrodynamic convection (2014)
  • Author(s): Yuji Sasaki, Yoshinori Takikawa, V. S. R. Jampani, Hikaru Hoshikawa, Takafumi Seto, Christian Bahr, Stephan Herminghaus, Yoshiki Hidaka, and Hiroshi Orihara
  • Organizer: 25th International Liquid Crystal Conference
  • Place of Presentation: Trinity College, Ireland
  • Year and Date: 2014-06-29 – 2014-07-04
• [Presentation] Rules for biologically inspired adaptive network design (2013)
  • Author(s): Toshiyuki Nakagaki
  • Organizer: RIES-Hokudai International Symposium
  • Place of Presentation: Chateraise Gateaux Kingdom, Sapporo
  • Year and Date: 20131211-20131212
• [Presentation] Electrically and thermally induced deformation of a chiral smectic liquid crystal elastomer (2013)
  • Author(s): Naoki Suematsu, Yang Ho Na, Yuji Sasaki, Hiroshi Orihara, Kazuyuki Hiraoka
  • Organizer: 14th International Conference on Ferroelectric Liquid Crystals
  • Place of Presentation: Lukas-Klause, Magdeburg, Germany
  • Year and Date: 20130901-20130906
• [Presentation] Dynamic heat capacity measurements of antiferroelectric liquid crystals (2013)
  • Author(s): Kenji Aihara, Kenji Ema, Hikaru. Hoshikawa, Yuji Sasaki, Hiroshi Orihara
  • Organizer: 14th International Conference on Ferroelectric Liquid Crystals
  • Place of Presentation: Lukas-Klause, Magdeburg, Germany
  • Year and Date: 20130901-20130906
• [Book] “生命現象の物理学－生物行動の運動方程式をめざして－”「物理学ガイダンス」日本評論編集部（編） (2014)
  • Author(s): 黒田茂、中垣俊之
  • Total Pages: 38 (189-216)
  • Publisher: 日本評論社
• [Book] 粘菌 偉大なる単細胞が世界を救う (2014)
  • Author(s): 中垣俊之
  • Total Pages: 198
  • Publisher: 文春新書
• [Book] “生命情報処理の現象数理学－粘菌の迷路解き－” 「現象数理学入門」三村昌泰（編） (2013)
  • Author(s): 中垣俊之
  • Total Pages: 20 (27-46)
  • Publisher: 東京大学出版会
• [Remarks] 新学術領域「ゆらぎと構造」業績リスト
  • URL: http://sfs-dynamics.jp/gyoseki/wp/
• [Remarks] ソフトマター工学
  • URL: http://www.eng.hokudai.ac.jp/labo/MOLPHY/home/