Author/Editor		Levstik, A; Kutnjak, Z; Filipič, C; Levstik, I; Bregar, Z; Žekš, B; Carlsson, T
Title		Dielectric method for determining the rotational viscosity in thick samples of ferroelectric chiral smectic-C* liquid crystals
Type		članek
Source		Physical Review A
Vol. and No.		Letnik 42, št. 4
Publication year		1990
Volume		str. 2204-10
Language		eng
Abstract		An alternative method, based on dielectric measurements on thick samples, for determinig the Goldsone-mode rotational viscosity and the twist elastic constant of ferroelectric, chiral smectic-C* liquid crystals is presented. By the use of this method the temperature dependece of these quantities for p-decyloxibenzilidine-p'-amino-1-methylpropyl-cinamate (DOBA-1-MPC) and p-ndecyloxybenzylidine-p-amino-2-methyl-butyl-cinamate (DOBAMBC) has been determined. An Arrhenius-type behavior of the Goldstone-mode rotational viscosity was obtained with activation energies micro = 0.33 eV for DOBA-1-MPC and micro = 0.51 eV for DOBAMBC.
Descriptors		MODELS, THEORETICAL RESEARCH DESIGN VISCOSITY CRYSTALLOGRAPHY THERMODYNAMICS ELECTROMAGNETIC FIELDS