基于分子场理论,研究一种新的空间各向异性两体作用势.对于该两体势,分子质心固定在简单立方晶格的格点上,而势参数依赖于液晶的弹性常数.通过函数迭代方法解分子取向分布函数满足的自洽方程.在大块液晶内部,存在3组单轴解,它们的指向矢分别沿x, y和z轴方向并且具有相同自由能.通过表面作用势描写摩擦后基板对液晶分子的作用,对20个分子层构成的5CB液晶薄层进行了数值计算.仍存在三种指向矢不同的状态,指向矢沿着摩擦方向的状态具有最低自由能.另外,讨论了表面作用在界面分子层中诱导的双轴序.
参考文献
| [1] | Chigrinov V G. Liquid Crystal Devices: Physics and Applications[M]. Artech House, 1999. |
| [2] | Gruhn T, Hess S. Monte Carlo simulation of the director field of a nematic liquid crystal with three elastic coefficients [J].Z. Naturforsch, 1996, 51a: 1-9. |
| [3] | Romano S. Elastic constants and pair potentials for nematogenic lattice models[J]. Int. J. Mod. Phys., 1998, B12(22): 2305-2323. |
| [4] | Lebwohl P A, Lasher G. Nematic-liquid-crystal order-a Monter Carlo calculation [J]. Phys. Rev., 1972, A6(1): 426-429. |
| [5] | Luckhurst R. The Molecular Physics of Liquid Crystals[M]. Luckhurst R, Gray G W edited. Academic Press, 1979, 85-119. |
| [6] | Zhang Zhidong, Li Zhiguang, Liu Jingli. Molecular theoretical calculations on temperature dependence of the pitch of cholestericliquid crystals[J]. Mod. Phys. Lett., 2002, B16(19): 721-726. |
| [7] | Zhang Zhidong, Huang Ximing. A two-particle cluster theory for uniaxial nematic liquid crystals formed by biaxial molecules[J]. Acta Physica Sinica (Overseas Edition), 1997, 6(9): 671-676. |
| [8] | 张志东,孔浩,薛山岭. 摩擦基板间液晶薄层的分子场理论[J]. 计算物理,2001,18(5):443-446. |
| [9] | Johannsmann D, Zhou H, Sonderkaer P, et al. Correlation between surface and bulk orientations of liquid crystals on rubbed polymer surfaces: Odd-even effects of polymer spacer units[J]. Phys. Rev., 1993, E48(3): 1889-1896. |
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