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Experimental test of curvature-driven dynamics in the phase ordering of a two dimensional liquid crystal

By Alberto Sicilia, Jeferson Jacob Arenzon, Ingo Dierking, Alan J. Bray, Leticia F. Cugliandolo, Josu Martínez Perdiguero, Ibon Alonso and Inmaculada C. Pintre

Abstract

We study electric field driven deracemization in an achiral liquid crystal through the formation and coarsening of chiral domains. It is proposed that deracemization in this system is a curvature-driven process. We test this prediction using the recently obtained exact result for the distribution of hullenclosed areas in two-dimensional coarsening with nonconserved scalar order parameter dynamics [J. J. Arenzon et al., Phys. Rev. Lett. 98, 145701 (2007)]. The experimental data are in very good agreement with the theory. We thus demonstrate that deracemization in such bent-core liquid crystals belongs to the Allen-Cahn universality class, and that the exact formula, which gives us the statistics of domain sizes during coarsening, can also be used as a strict test for this dynamic universality class

Topics: Transicoes de fase, Transformacoes de ordem-desordem, Moleculas, Cristais liquidos
Year: 2014
OAI identifier: oai:agregador.ibict.br.PC_UFRGS:oai:www.lume.ufrgs.br:10183/99407
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