Aya Satoshi, Le Khoa V, Sasaki Yuji, Araoka Fumito, Ishikawa Ken, Takezoe Hideo
Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1-S8-42 O-okayama, Meguro, Tokyo 152-8552, Japan.
Phys Rev E Stat Nonlin Soft Matter Phys. 2012 Jul;86(1 Pt 1):010701. doi: 10.1103/PhysRevE.86.010701. Epub 2012 Jul 2.
We report an anchoring transition of a liquid crystal under the influence of an electric field (E field) in the vicinity of a first-order anchoring transition (ATr) temperature showing bistable homeotropic (H) and planar (P) states. By means of polarizing microscopy combined with retardation and switching and dielectric measurements, three important observations were made: (1) The anchoring transition from H to P driven by an E field is first order with a threshold E-field strength, which decreases with increasing temperature; (2) the thickness of the H layer that is to be converted to the P orientation increases toward ATr temperature T(ATr); and (3) the temperature dependence of both parameters is well described by a power law.
我们报道了在一阶锚定转变（ATr）温度附近，液晶在电场（E场）影响下的锚定转变，呈现出双稳态垂直（H）和平行（P）状态。通过偏光显微镜结合相位延迟、切换和介电测量，我们得到了三个重要发现：（1）由电场驱动的从H到P的锚定转变是一阶的，存在一个阈值电场强度，该强度随温度升高而降低；（2）要转变为P取向的H层厚度朝着ATr温度T(ATr)增加；（3）这两个参数的温度依赖性都可以用幂律很好地描述。
