Phase behavior of liquid crystals confined by smooth walls.
Phase behavior of liquid crystals confined by smooth walls.
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光滑壁限制液晶的相行为。
DOI：
10.1103/physreve.69.031708
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
M. Schoen
中科院分区：
文献类型：
--
作者：
H. Steuer;S. Hess;M. Schoen
对一种简单模型液晶进行了蒙特卡罗模拟。对于两种不同的锚定机制，一种有利于垂面排列，另一种模拟没有外部场的扭曲单胞，例如，具有不同的均匀平面对齐的两个壁。模拟是在定压系综中进行的。长方体体积可能会在垂直于墙法线的方向上发生变化。首先研究了体相系统中不同同量异位素的各向同性相变。对于弱的一阶过渡，我们没有观察到任何滞后下降到温度精度的deltaT=0.001。等温线T=1，然后研究在散装以及在受限的几何形状。由于层的形成，壁稳定了系统中的位置顺序。取向顺序是弱稳定的。
Monte Carlo simulations for a simple model liquid crystal are presented. The influence of flat walls on the phase behavior is analyzed for two different anchoring mechanisms, one favoring homeotropic alignment and one simulating a twisted nematic cell without external fields, e.g., two walls with different homogeneous planar alignment. The simulations are performed in the constant pressure ensemble. The box volume may change in the directions perpendicular to the wall normal. The isotropic-nematic phase transition in the bulk system is first studied for different isobars. For the weak first order transition we do not observe any hysteresis down to a temperature accuracy of deltaT=0.001. The isotherm T=1 is then studied in the bulk as well as in the confined geometries. The walls stabilize the positional order in the systems due to the formation of layers. The orientational order is weakly stabilized.