Surface effect on the field-induced structural change near the isotropic-cholesteric transition.
Surface effect on the field-induced structural change near the isotropic-cholesteric transition.
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各向同性胆甾相转变附近场引起的结构变化的表面效应。
DOI：
10.1103/physreva.42.997
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
J. S. Patel
中科院分区：
文献类型：
--
作者：
Sin;J. S. Patel
本文研究了在各向同性液晶中，外电场引起的螺旋结构变化的表面效应。我们表明，在交流电场的存在下，从各向同性相冷却的均匀锚定的样品产生单域，其中螺旋位于基板的平面中。对准的螺旋轴和抛光轴B^之间的角度随着场的增加而增加，直到螺旋扩张的临界强度。螺旋轴相对于B^的方向取决于双螺旋度的方向和底物的性质。一个简单的模型来解释所观察到的实验结果。
We study the surface effect on the change in a helical structure induced by an external electric field near the isotropic-cholesteric transition in cholesteric liquid crystals. We show that in the presence of an ac electric field, a homogeneously anchored sample cooled from the isotropic phase produces a mono-domain in which the helix lies in the plane of the substrate. The angle between the aligned helix axis and the buffing axis b^ increases with the field up to the critical strength for helix dilation. The direction of the helix axis with respect to b^ depends on the sense of the cholesteric helicity and the nature of the substrate. A simple model is presented to account for the observed experimental results.