Hybrid nematic films have been studied by Monte Carlo simulations using a lattice spin model, in which the pair potential is spatially anisotropic and dependent on elastic constants of liquid crystals. We confirm in t...Hybrid nematic films have been studied by Monte Carlo simulations using a lattice spin model, in which the pair potential is spatially anisotropic and dependent on elastic constants of liquid crystals. We confirm in the thin hybrid nematic film the existence of a biaxially nonbent structure and the structure transition from the biaxial to the bent-director structure, which is similar to the result obtained using the Lebwoh-Lasher model. However, the step-like director＇s profile, characteristic for the biaxial structure, is spatially asymmetric in the film because the pair potential leads to K1 ≠ K3. We estimate the upper cell thickness to be 69 spin layers, in which the biaxial structure can be found.展开更多
在分子场近似下研究 个分子层构成的向列相液晶薄层.使用文献上最近提出的空间各向异性两体作用势.存在两个模型,分别给出液晶弹性常数到势参数的两种映射方案.对液晶PAA 进行了数值计算.模型 I 给出液晶指向矢垂直薄层表面排列,而模型 ...在分子场近似下研究 个分子层构成的向列相液晶薄层.使用文献上最近提出的空间各向异性两体作用势.存在两个模型,分别给出液晶弹性常数到势参数的两种映射方案.对液晶PAA 进行了数值计算.模型 I 给出液晶指向矢垂直薄层表面排列,而模型 II 给出指向矢平行于薄层表面排列.两个模型给出有限尺寸效应对向列相-各向同性相相变温度的影响也不同.展开更多
基金Project supported by the National Natural Science Foundation of China (Grants Nos 60736042 and 60878047)the Key Subject Construction Project of Hebei Province University
文摘Hybrid nematic films have been studied by Monte Carlo simulations using a lattice spin model, in which the pair potential is spatially anisotropic and dependent on elastic constants of liquid crystals. We confirm in the thin hybrid nematic film the existence of a biaxially nonbent structure and the structure transition from the biaxial to the bent-director structure, which is similar to the result obtained using the Lebwoh-Lasher model. However, the step-like director＇s profile, characteristic for the biaxial structure, is spatially asymmetric in the film because the pair potential leads to K1 ≠ K3. We estimate the upper cell thickness to be 69 spin layers, in which the biaxial structure can be found.
文摘在分子场近似下研究 个分子层构成的向列相液晶薄层.使用文献上最近提出的空间各向异性两体作用势.存在两个模型,分别给出液晶弹性常数到势参数的两种映射方案.对液晶PAA 进行了数值计算.模型 I 给出液晶指向矢垂直薄层表面排列,而模型 II 给出指向矢平行于薄层表面排列.两个模型给出有限尺寸效应对向列相-各向同性相相变温度的影响也不同.
