| Project/Area Number |
24540433
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Biophysics/Chemical physics
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| Research Institution | Kyoto University |
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Principal Investigator |
ARAKI Takeaki 京都大学, 理学(系)研究科(研究院), 准教授 (20332596)
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| Co-Investigator(Kenkyū-buntansha) |
ONUKI Akira 京都大学, 理学研究科, 名誉教授 (90112284)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | ネマティック液晶 / 多孔質 / 非線形流動 / 数値シミュレーション / トポロジカル欠陥 / 相転移現象 / メモリー効果 / アンカリング効果 / ネマチック液晶 / タンブリング / マイクロフルイディクス / 輸送現象 / Landau-de Gennesモデル / 格子ボルツマン法 |
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| Outline of Final Research Achievements |
When a nematic liquid crystal is confined in a porous medium, topological defects are stably formed with numerous possible configurations. Since the energy barriers between them are large, the system shows multistability. Our lattice Boltzmann simulations demonstrate dynamic couplings between the multistable defect pattern and the flow in a porous matrix. At sufficiently low flow speed, the topological defects are pinned at the quiescent positions. As the flow speed is increased, the defects show cyclic motions and nonlinear rheological properties, which depend on whether or not they are topologically constrained in the porous networks. Also we found the defect pattern can be controlled by controlling the flow. Thus, the flow path is recorded in the porous channels owing to the multistable defect patterns. We also studied the effect of electric field. We found nematic domains appear around the surfaces of a large curvatures even above the phase transition temperature.
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