| Project/Area Number |
01540300
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
物性一般（含極低温･固体物性に対する理論）
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| Research Institution | Yamaguchi University |
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Principal Investigator |
YAMAMOTO Takashi Yamaguchi University Physics Associate Prof., 理学部, 助教授 (00127797)
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| Co-Investigator(Kenkyū-buntansha) |
ASAHI Takanao Yamaguchi University Liberal Art Lectureer, 教養部, 構師 (30184154)
HARA Tetsuhiko Yamaguchi University Physics Prof., 理学部, 教授 (60034724)
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| Project Period (FY) |
1989 – 1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1990: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1989: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | Lipid / Liquid Crystal / Dynamical Structure / Computer Simulation / Phase Transition / Soft Mode / 構造不安定性 / コンピュ-タ・シミュレ-ション / コンピュ-タ-・シミュレ-ション / X線散漫散乱 / 誘電測定 / 単結晶 / n-アルコ-ル |
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| Research Abstract |
Under support by the grant, we made the following researches on the dynamical structures of lipid systems by computer simulations and analytical calculations.
(1) Computer Simulations : A dynamical structure of a long chain hydrocarbon confined in a crystalline field potential was studied by Monte Carlo simulation. The chain is straightened by strong crystalline field ; the independent rotations of dihedral angles are prohibited giving rise to an effective long range interaction along the chain. The interaction was found to cause an anomalous mode of the conformational fluctuation ( was vector k=1/4c ) which grows with decreasing potential. It is considered to be a sort of soft mode in the hydrocarbon chain.
(2) The characteristic mode of conformational fluctuation was further studied by an analytical method. The conformational fluctuation was expressed by a fluctuation of dihedral angles. A kind of normal mode analysis was made, and it suggested a presence of a precursor of the anomalous fluctuation predicted by the MC simulation.
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