Statistical models of mixtures with a biaxial nematic phase

Details Statistical models of mixtures with a biaxial nematic phase Statistical models of mixtures with a biaxial nematic phase

2010-02-27

arxiv.org/abs/1003.0130v1

Physics

Condensed Matter

Statistical Mechanics

11 pages, 2 figures

Scientific paper

We consider a simple Maier-Saupe statistical model with the inclusion of disorder degrees of freedom to mimic the phase diagram of a mixture of rod-like and disc-like molecules. A quenched distribution of shapes leads to the existence of a stable biaxial nematic phase, in qualitative agreement with experimental findings for some ternary lyotropic liquid mixtures. An annealed distribution, however, which is more adequate to liquid mixtures, precludes the stability of this biaxial phase. We then use a two-temperature formalism, and assume a separation of relaxation times, to show that a partial degree of annealing is already sufficient to stabilize a biaxial nematic structure.

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