TRANSIENT CHARGING CURRENT IN NEMATIC LIQUID-CRYSTALS

被引：62

作者：

NAITO, H ^{[1
]}

YOSHIDA, K ^{[1
]}

OKUDA, M ^{[1
]}

SUGIMURA, A ^{[1
]}

机构：

[1] OSAKA SANGYO UNIV, DEPT INFORMAT SYST ENGN, DAITO, OSAKA 574, JAPAN

来源：

JOURNAL OF APPLIED PHYSICS | 1993年 / 73卷 / 03期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.353276

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Transient charging currents in nematic liquid crystals have been measured with a single- and a double-voltage pulse technique to elucidate the role of impurity ions incorporated in the materials in the transient charging processes. In the single pulse experiment, a peak in the current transient is observed in the nematic phase. It is shown that occurrence of the peak is due to the alignment of the director of the liquid crystal molecules in the direction of applied electric field. In the double pulse experiment, a voltage pulse (prepulse) is applied to the liquid crystal before the measurement of the transient current. It is observed that the application of the prepulse significantly alters the shape of the current. The changes in the current can be explained by considering the impurity ion distribution, modified by the prepulse, in the nematic liquid crystals. It is concluded that the double pulse experiment is a powerful tool for the examination of the influence of impurity ions in liquid crystals on the current transients.

引用

页码：1119 / 1125

页数：7

共 11 条

[1] ANISOTROPIC ELECTRICAL-CONDUCTIVITY OF MBBA CONTAINING TETRABUTYL-AMMONIUM TETRAPHENYL-BORIDE [J].