Publication:
Surface phase transitions in polydisperse hard rod fluids

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2002-12
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Abstract
With the simple Zwanzig model in Onsager approximation I study the effect of length polydispersity in the surface phase diagram of hard rods interacting with a hard wall. The properly extended interface Gibbs-Duhem equation for a polydisperse system allows us to predict the behaviour of the surface tension as a function of the bulk density at the the wall-isotropic interface. Two groups of qualitative different bulk and surface phase diagrams are calculated from two families of parametrized length distribution functions p(l). This parameterization controls the law of decay at large l. I also study the segregation due to polydispersity at the isotropic-nematic interface and the capillary nematization phenomena as a function of polydispersity.
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20 pages, 25 figures.-- PACS nrs.: 64.70.Md, 64.75.+g, 61.20.Gy.-- ArXiv pre-print.
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[PACS] Transitions in liquid crystals, [PACS] Phase equilibria, [PACS] Theory and models of liquid structure
Bibliographic citation
arXiv:cond-mat/0212333v1 [cond-mat.soft]