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8th Liquid Matter Conference September 6-10, 2011 Wien, Austria ...

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Thu 811:<strong>10</strong>-14:00P7.125Size selectivity of binary mixtures in cylindrical poresJuan A. White, 1 Antonio González, 1 Francisco L. Román, 1 and Santiago Velasco 11 Universidad de Salamanca, Dept. Fisica Aplicada, 37008, Salamanca, SpainWe show that a simple model consisting of a binary hard-sphere mixture in a narrow cylindricalpore can lead to strong size selectivity by considering a situation where each species of themixture sees a different radius of the cylinder. Two mechanisms are proposed to explain the observedresults depending on the radius of the cylinder: for large radii the selectivity is driven byan enhancement of the depletion forces at the cylinder walls whereas for the narrowest cylindersexcluded-volume effects lead to a shift of the effective chemical potential of the particles in thepore.125

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