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Ultrasound in the isotropic phase of cholesteric liquid crystals. / Romanov, V. P.; Ul'yanov, S. V.
в: Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals, Том 281, 1996, стр. 187-204.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Ultrasound in the isotropic phase of cholesteric liquid crystals
AU - Romanov, V. P.
AU - Ul'yanov, S. V.
N1 - Copyright: Copyright 2018 Elsevier B.V., All rights reserved.
PY - 1996
Y1 - 1996
N2 - The acoustical properties of cholesteric liquid crystals in the isotropic phase including the vicinity of the phase transition point to the ordered phase are investigated. An interaction of fluctuating field of the tensor order parameter with the sound wave is considered. In Gaussian approximation the contribution of fluctuating modes to the sound velocity dispersion and attenuation is calculated. The obtained formulae are compared with ones for nematics in isotropic phase. It was found that the difference between these results rises in the vicinity of the phase transition point. This difference is connected, on the one hand, with the specific fluctuating spectrum and on the other hand with the closing of the instability temperatures of some fluctuating modes to the phase transition temperature Tc. The results are illustrated by the numerical calculations.
AB - The acoustical properties of cholesteric liquid crystals in the isotropic phase including the vicinity of the phase transition point to the ordered phase are investigated. An interaction of fluctuating field of the tensor order parameter with the sound wave is considered. In Gaussian approximation the contribution of fluctuating modes to the sound velocity dispersion and attenuation is calculated. The obtained formulae are compared with ones for nematics in isotropic phase. It was found that the difference between these results rises in the vicinity of the phase transition point. This difference is connected, on the one hand, with the specific fluctuating spectrum and on the other hand with the closing of the instability temperatures of some fluctuating modes to the phase transition temperature Tc. The results are illustrated by the numerical calculations.
KW - Cholesteric liquid crystals
KW - Isotropic phase
KW - Tensor order parameter
KW - Ultrasound
UR - http://www.scopus.com/inward/record.url?scp=4243118824&partnerID=8YFLogxK
U2 - 10.1080/10587259608042244
DO - 10.1080/10587259608042244
M3 - Article
AN - SCOPUS:4243118824
VL - 281
SP - 187
EP - 204
JO - Molecular Crystals and Liquid Crystals
JF - Molecular Crystals and Liquid Crystals
SN - 1542-1406
ER -
ID: 76496502