Determining the sum of flexoelectric coefficients in nematic liquid crystals by the capacitance method

A detailed theoretical analysis of determining the sum of flexoelectric coefficients in nematic liquid crystals using the capacitance method is given. In the strong anchoring parallel aligned nematic （PAN） and hybrid aligned nematic （HAN） cells, the dependences of the capacitance on the sum of flexo...

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Published inChinese physics B Vol. 23; no. 11; pp. 414 - 421
Main Author 叶文江 邢红玉 崔文静 周璇 孙玉宝 张志东
Format Journal Article
LanguageEnglish
Published 01.11.2014
Subjects
Alignment
Capacitance
Electric potential
Liquid crystals
Mathematical models
Measuring instruments
Nematic
Simulation
Voltage
向列型液晶
向列液晶
外加电压
挠曲
数值模拟
混合排列
电容法
电系
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Summary:A detailed theoretical analysis of determining the sum of flexoelectric coefficients in nematic liquid crystals using the capacitance method is given. In the strong anchoring parallel aligned nematic （PAN） and hybrid aligned nematic （HAN） cells, the dependences of the capacitance on the sum of flexoelectric coefficients and the applied voltage are obtained by numerical simulations, and the distributions of the director and the electric potential for different applied voltages and flexoelectric coefficients are also given. Based on this theoretical analysis, we propose an experimental design for measuring the capacitance of a liquid crystal cell using the improved precision LCR meter E4980A （Agilent）. Through comparing the experimental data with the simulated results, the sum of flexoeletric coefficients can be determined.
Bibliography:Ye Wen-Jiang, Xing Hong-Yu, Cui Wen-Jing, Zhou Xuan, Sun Yu-Bao, and Zhang Zhi-Dong（ a） School of Sciences, Hebei University of Technology, Tianjin 300401, China b） School of Physics, Nankai University, Tianjin 300071, China
flexoelectricity, capacitance, parallel aligned nematic and hybrid aligned nematic liquid crystals
11-5639/O4
A detailed theoretical analysis of determining the sum of flexoelectric coefficients in nematic liquid crystals using the capacitance method is given. In the strong anchoring parallel aligned nematic （PAN） and hybrid aligned nematic （HAN） cells, the dependences of the capacitance on the sum of flexoelectric coefficients and the applied voltage are obtained by numerical simulations, and the distributions of the director and the electric potential for different applied voltages and flexoelectric coefficients are also given. Based on this theoretical analysis, we propose an experimental design for measuring the capacitance of a liquid crystal cell using the improved precision LCR meter E4980A （Agilent）. Through comparing the experimental data with the simulated results, the sum of flexoeletric coefficients can be determined.
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/23/11/116101