Dielectric and electro-optical properties of a photosensitive liquid crystal

被引：5

作者：

Boussoualem, Y. ^{[1
]}

Ismaili, M. ^{[1
]}

Buisine, J. M. ^{[1
]}

Binet, C. ^{[1
]}

Joly, G. ^{[1
]}

Nguyen, H. T. ^{[2
]}

机构：

[1] Univ Lille 1, Lab Dynam & Struct Mat, UMR CNRS USTL ULCO UFR Phys, F-59655 Villeneuve Dascq, France

[2] Univ Bordeaux 1, Ctr Rech Paul Pascal, F-33600 Pessac, France

来源：

LIQUID CRYSTALS | 2009年 / 36卷 / 09期

关键词：

liquid crystal; ferroelectric; photosensitive; electro-optic; dielectric; SMECTIC-C-STAR; PHASE-TRANSITION; SPONTANEOUS POLARIZATION; LIGHT; PITCH; TILT;

D O I：

10.1080/02678290903108458

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The temperature dependencies of the dielectric and electro-optical properties of a pure photo-ferroelectric liquid crystal have been investigated, in the chiral smectic C (SmC*) phase, with and without ultraviolet (UV) illumination. The SmC* dielectric Goldstone mode characteristics, the spontaneous polarization, the tilt angle and the rotational viscosity are affected by UV irradiation. Under increasing UV light intensities the dielectric strength epsilon G increases whereas the relaxation frequency fG, the spontaneous polarization Ps, the electro-optical rotational viscosity eo and the tilt angle decrease. The twist elastic constant K3 and the Goldstone mode rotational viscosity G of the studied compound are deduced from dielectric experimental results. Good agreement was found between both viscosities. The observed dielectric behaviours are controlled by the elastic constant and the rotational viscosity variations.

引用

页码：899 / 905

页数：7

共 36 条

[1] Photoresponsive ferroelectric liquid-crystalline polymers [J].