胆甾相液晶盒贝纳德效应实验  

Bernard Effect Experiment of Cholesteric Liquid Crystal Cell

作　　者：杨磊[1] 刘洋[1] 郑永磊[1] 高攀[1] 范志新[1] 

机构地区：[1]河北工业大学应用物理系,天津300401

出　　处：《液晶与显示》2012年第3期288-291,共4页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.10974042)

摘　　要：介绍了贝纳德效应,胆甾相液晶织构等概念,实验制备出胆甾相液晶平面态样品,用偏光显微镜观察温度场致织构变化,观察到液晶盒在清亮点温度附近出现特殊花纹图案,类似于贝纳德效应或者是温度场致方格栅效应。实验现象说明了温度场使液晶分子产生对流,在偏光显微镜下观察双折射干涉,指向矢分布有周期性变化,形成了微观的贝纳德花纹。实验现象对于胆甾相液晶基础研究具有一定意义。The conception of Bernard effect and cholesteric liquid crystal texture are intro- duced. The sample of cholesteric liquid crystal in planar texture is prepared, the texture change with temperature field by polarizing microscope is observed. The Bernard effect or pane grate effect under the cleaning temperature is appeared. The experimental phenomena show that the temperature field induced the liquid crystal molecule convection, the birefrin- gence interference is occurred, and liquid crystal director distribution is periodical variation, so that the microcosmic Bernard effect pattern formed. The experimental phenomena wait for explanation rightly, and have some significance for liquid crystal physics basic research.

关 键 词：胆甾相液晶 平面织构 方格栅效应 贝纳德效应 偏光显微镜 

分 类 号：O753.2[理学—晶体学] TN104.3[电子电信—物理电子学]