Pattern forming instabilities of the nematic smectic-B interface

Free growth properties of the smectic B liquid crystalline phase into the supercooled nematic have been investigated in quasi-two-dimensional geometry. Different orientation combinations of the two phases have been achieved experimentally and the interfacial patterns have been studied and analysed a...

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Veröffentlicht in:Physics reports 2000-10, Vol.337 (1), p.37-65
Hauptverfasser: Tóth-Katona, T, Börzsönyi, T, Buka, Á, González-Cinca, R, Ramı́rez-Piscina, L, Casademunt, J, Hernández-Machado, A, Kramer, L
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container_issue 1
container_start_page 37
container_title Physics reports
container_volume 337
creator Tóth-Katona, T
Börzsönyi, T
Buka, Á
González-Cinca, R
Ramı́rez-Piscina, L
Casademunt, J
Hernández-Machado, A
Kramer, L
description Free growth properties of the smectic B liquid crystalline phase into the supercooled nematic have been investigated in quasi-two-dimensional geometry. Different orientation combinations of the two phases have been achieved experimentally and the interfacial patterns have been studied and analysed as a function of undercooling. The angular dependence of the surface tension has been deduced from the shape of the interface in thermal equilibrium. The experimentally determined surface tension anisotropy has been incorporated into computer simulations based on the phase-field model. The simulations have reproduced qualitatively the rich variety of morphologies (extending from the faceted shape to fully developed dendrites) observed in the experiments for a given set of undercoolings in three geometries. Anisotropic heat diffusion on the nematic side, relevant to our experimental system has also been introduced. Both in the experiments and in the simulations we find that the growth is faster in the lower heat diffusion direction.
doi_str_mv 10.1016/S0370-1573(00)00055-7
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subjects Física
Termodinàmica
Thermodynamics
Àrees temàtiques de la UPC
title Pattern forming instabilities of the nematic smectic-B interface
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