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

• 作 者: 叶文江 邢红玉 崔文静 周璇 孙玉宝 张志东
• 机 构: School of Sciences, Hebei University of Technology,School of Physics, Nankai University,
• 出 处: Chinese Physics B
• 发表日期: 2014年11期
• 关键词: capacitance nematic aligned director determining capacitor chiral symmetrical di

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.

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 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 comparing the experimental data with the simulated results, the sum of flexoeletric coefficients can be determined.