Evolution of the discontinuous anchoring transition under an electric field
Evolution of the discontinuous anchoring transition under an electric field
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电场下不连续锚定转变的演化
DOI：
10.1103/physreve.87.012507
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发表时间：
2013
影响因子：
2.4
通讯作者：
Hideo Takezoe
中科院分区：
文献类型：
--
作者：
Satoshi Aya (謝暁晨);Fumito Araoka;Ken Ishikawa;Hideo Takezoe
液晶分子在表面上的取向随温度的变化而发生变化，这种取向转变（ATr）在本质上受到电场的影响。通过结合离焦偏光显微镜与延迟测量，在ATr附近的分子取向的变化在anfield下的冷却过程中进行了详细的调查。从我们的观察中可以得出两个重要的结论：（i）ATr温度在anfield的存在下表现出很大的下移;（ii）从平面（）状态到垂面（）状态的取向变化总是不连续的。当外加电场低于Freedericksz转变时，态是均匀的，而由于负的介电各向异性，表面态受到体相倾斜的影响，形成双展形变态。
Anchoring transition (ATr), resulting in the orientational change of liquid crystal (LC) molecules at surfaces with temperature variation, is shown to be essentially affected by the application of an electric field (field). By combining defocusing polarizing microscopy with retardation measurement, a detailed investigation of the molecular orientational change in the vicinity of ATr during a cooling process under anfield was performed. Two important conclusions can be made from our observations: (i) the ATr temperature exhibits a large downshift in the presence of anfield; (ii) the orientational change is always discontinuous from a planar () state to a homeotropic () state. If the appliedfield is below the Freedericksz transition,andstates are uniform, whereas the surfacestate is influenced by the tilt in the bulk due to negative dielectric anisotropy, resulting in a bent-splay deformed state.