序电效应和电场对向列相液晶分子有序度的影响

Electric Field-Induced Changes in Molecular Order in Nematic Liquid Crystals and Order Electricity

液晶盒内分子的排列很容易受外场的影响,对向列相液晶盒施加足够大的电场,液晶分子排列和序参数都将随空间变化,序参数发生变化会有序电效应产生,要考虑序参数的变化我们选用朗道自由能展开式表示液晶的体自由能密度。本文讨论的是平行型液晶盒,利用差分法和计算机模拟计算得到了不同电场作用下向列相液晶分子指向矢和序参数随空间变化的图形规律,并讨论了序电效应和序电极化能对自由能密度的影响。

The liquid crystal molecules are easily affected by outfield, if the nematic liquid crystal cell is given voltage large enough the range and order parameter of the liquid crystal molecules will change according to the space, the change of the order parameter will induce order electricity, considering to the above we＇d better choose landau free energy expression. In this paper we discuss parallel mode cell, and with difference measure and computer simulation we obtain the figure orderliness of changes of the director and order parameter of the liquid crystal molecules depending on different electric field, and we discuss how the free energy is affected by order electricity and order polarization.