Viscosity Measurement in Ferroelectric Liquid Crystals Using a Polarization Switching Current
Viscosity Measurement in Ferroelectric Liquid Crystals Using a Polarization Switching Current
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使用极化切换电流测量铁电液晶的粘度
DOI：
10.1143/jjap.26.l255
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发表时间：
1987
影响因子：
1.5
通讯作者：
A. Fukuda
中科院分区：
文献类型：
--
作者：
S. Kimura;S. Nishiyama;Y. Ouchi;H. Takezoe;A. Fukuda
提出了一种计算铁电液晶转动粘度η的新方法。这种方法是基于场反转时极化转换电流的测量。结果表明，电流峰tw的半峰全宽等于1.76η/PsE，而峰面积是自发极化强度Ps的两倍。它还表明，介电各向异性Δε的符号是由信号的不对称形状。对于表面稳定的铁电液晶单元，确认tw和E-1之间的比例。给出了Ps和η随温度的变化关系。
A new method to evaluate rotational viscosity η in ferroelectric liquid crystals is proposed. This method is based on the measurement of a polarization switching current upon field reversal. It is shown that a full width at half-maximum of the current peak tw is equal to 1.76η/PsE, while the area gives twice the spontaneous polarization Ps. It is also shown that the sign of a dielectric anisotropy Δε is determined by the asymmetrical shape of the signal. A proportionality between tw and E-1 was confirmed for a surface stabilized ferroelectric liquid crystal cell. The temperature dependences of Ps and η are presented.