热电性
材料科学
液晶
相变
旋转粘度
极化(电化学)
形状记忆合金*
相(物质)
倾斜(摄像机)
温度系数
切换时间
铁电性
电场
光学
凝聚态物理
光电子学
复合材料
化学
电介质
有机化学
物理
物理化学
机械工程
量子力学
工程类
数学
组合数学
作者
A. Kocot,Roman Wrzalik,J. K. Vij,Rudolf Zentel
摘要
The pyroelectric coefficient, the spontaneous polarization Ps, the optical tilt angle θ, and the switching time of a polysiloxane liquid crystalline polymer have been measured. The pyroelectric coefficient is found to be one order of magnitude greater and the response broader than for a low molar liquid crystal reported in the literature and is comparable to that of the solid ferroelectrics. Ps vs θ is found to be nonlinear, and the ratio of Ps/θ shows anomalies close to the SmC*-SmA transition temperature. The measurements of θ and the optical response time are used to calculate the switching time which spans from 1 to 100 ms, depending on the temperature. The optical response time in the SmA phase close to the SmC*-SmA transition temperature, together with a finite value of the pyroelectric coefficient, provide evidence of a SmC* phase induced by an external field. The rotational viscosity as a function of temperature shows critical behavior at the SmC*-SmA phase transition temperature.
科研通智能强力驱动
Strongly Powered by AbleSci AI