Open AccessФлексоэлектрические домены в бинарной смеси нематиков
Author(s) -
В.А. Делев,
Ю.И. Тимиров
Publication year - 2021
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2021.02.50542.18388
Subject(s) - mbba , liquid crystal , threshold voltage , materials science , anisotropy , dielectric , voltage , flexoelectricity , condensed matter physics , substrate (aquarium) , optics , optoelectronics , physics , oceanography , transistor , quantum mechanics , geology
Flexoelectric domains formation in mixture of nematic liquid crystals (NLC) MBBA and 5CB with anisotropy of dielectric permeability ε_a ~ 0 under the action of dc electric voltage is investigated. Threshold characteristics of flexoelectric domains formation (threshold voltage and spatial period) in the studied mixture are measured. The difference of flexoelectric coefficients |e1-e3| is determined. It is shown that in the mixture of nematics with ε_a ~ 0 , the threshold voltage is determined only by the ratio k/(e1-e3) (k - average elastic constant), which allows to calculate the difference in flexocoefficients |e1-e3| directly, excluding the properties of substrate surfaces. The definition method of the flexoelectric coefficients, proposed and approved in paper, can be useful for the new synthesized NLC with ε_a <- 0.5.