Abstract
The dual nature of the acoustic mechanism of destabilizing the planar texture of a cholesteric liquid crystal is confirmed experimentally. This destabilization manifests itself in the formation of a system of two-dimensional domains in the frequency range where the wavelength exceeds the cholesteric-helix pitch. A criterion for identifying two independent acoustic mechanisms (vortex and relaxation ones) is suggested and experimentally verified by analyzing the measured dependence of the critical compression amplitude on the cholesteric-helix pitch in the 40-, 120-, and 240-μm-thick mesophase layers for frequencies of 2.95 and 14.5 MHz, which are respectively lower and higher than the reciprocal relaxation time of the orientational order parameter of the cholesteric liquid crystal.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
O. Kapoustina, V. Loupanov, and I. Gourova, in 7eme Congres International sur les Cristeaux Liguids (Bordeaux, 1978), p. 51.
Handbook of Liquid Crystals, Ed. by D. Demus et al. (Wiley, Weinheim, 1998).
O. Kapustina, in Physical Properties of Liquid Crystals (Wiley, Weinheim, 1999).
E. N. Kozhevnikov, Zh. Éksp. Teor. Fiz. 92, 1306 (1987) [Sov. Phys. JETP 65, 731 (1987)].
E. N. Kozhevnikov, Akust. Zh. 48, 777 (2002) [Acoust. Phys. 48, 687 (2002)].
S. A. Pikin, Structural Transformation in Liquid Crystals (Nauka, Moscow, 1981) [in Russian].
M. Doi and S. Edwards, J. Chem. Soc., Faraday Trans. 2 74, 560 (1978).
A. N. Semenov, Zh. Éksp. Teor. Fiz. 85, 549 (1983) [Sov. Phys. JETP 58, 321 (1983)].
M. Osipov and E. Terentjev, Phys. Lett. A 134, 301 (1989).
L. Bergmann, Der Ultraschall und seine Anwendung in Wissenschaft und Technik (Hirzel, Zurich, 1954; Inostrannaya Literatura, Moscow, 1956).
I. Gurova and O. Kapustina, Pis’ma Zh. Éksp. Teor. Fiz. 63, 866 (1996) [JETP Lett. 63, 907 (1996)].
O. A. Kapustina, N. A. Kolesnikova, and O. V. Romanova, Akust. Zh. 50, 77 (2004) [Acoust. Phys. 50, 66 (2004)].
Author information
Authors and Affiliations
Additional information
__________
Translated from Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 81, No. 8, 2005, pp. 481–485.
Original Russian Text Copyright © 2005 by Kapustina.
Rights and permissions
About this article
Cite this article
Kapustina, O.A. On the nature of the acoustic mechanism of domain formation in a cholesteric liquid crystal. Jetp Lett. 81, 390–393 (2005). https://doi.org/10.1134/1.1951015
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1134/1.1951015