Abstract

Effect of fullerenes C₆₀ on dielectric relaxation, electric conductivity, and electro-optic properties of nematic liquid crystal 4-cyano-4′-pentylbiphenyl is investigated. It is shown that the inclusion of fullerenes into liquid crystal leads to decreasing of the clearing temperature and the order parameter. In this case, the transverse component of the real part of dielectric permittivity increases while the longitudinal component decreases. A maximum of dielectric absorption shifts to the low-frequency region. The capture of moving ions by fullerenes leads to a decrease of electric conductivity. The elastic constant, rotational viscosity and switching times decrease while the threshold voltage of Freedericksz effect increases.

摘要

研究了富勒烯C ₆₀对向列液晶4-氰基-4'-戊基联苯的介电弛豫，电导率和电光性质的影响。结果表明，在液晶中包含富勒烯会导致澄清温度和有序参数降低。在这种情况下，介电常数的实部的横向分量增大而纵向分量减小。最大的介电吸收移向低频区域。富勒烯捕获运动离子会导致电导率降低。弹性常数，旋转粘度和切换时间减少，而Freedericksz效应的阈值电压增加。