液晶与显示2011，Vol.26Issue(6)：711-718,8.DOI:10.3788/YJYXS20112606.0711
弹性键相连的双矩形板液晶分子系统的相变
Phase Transitions of Molecular System Consisted by Double Rectangular Plates Connected by Flexible Chain
李峥 1刘红1
作者信息
- 1. 南京师范大学物理科学与技术学院,江苏南京210046
- 折叠
摘要
Abstract
The phase transitions of molecular system consisted by double rectangular plates connected by flexible chain are studied in this paper. Based on a simple interaction energy between molecules and the approximation of mean-field theory, as the interaction strength of flexible chain increases, four kinds of phase diagrams in the plane of molecular structure and temperature are obtained. In the first kind (where the interaction strength is the smallest) there is only one Landau point that allows system directly transit from isotropic phase to biaxial phase. In the second kind, Landau point spreads to a Landau curve. The region of positive uniaxial phase increases and that of negative uniaxial phase decreases. In the phase diagram, a first order transition from uniaxial phase to biaxial phase appears. In the third kind Landau point also spreads to a Landau curve, but the region of negative uniaxial phase disappears. In the fourth kind(the interaction strength of flexible chain is the largest), the range of Landau curve becomes narrower.关键词
双轴向列相液晶/相变/四足形分子Key words
biaxial nematics/phase transition/tetrapodes分类
数理科学引用本文复制引用
李峥,刘红..弹性键相连的双矩形板液晶分子系统的相变[J].液晶与显示,2011,26(6):711-718,8.
