Wetting in mixtures of colloids and excluded-volume polymers from density functional theory

Details Wetting in mixtures of colloids and excluded-volume polymers from density functional theory Wetting in mixtures of colloids and excluded-volume polymers from density functional theory

2005-07-15

arxiv.org/abs/cond-mat/0507371v2

J.Chem. Phys. 123, 234907 (2005)

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 6 figures, revised version, at press in J. Chem. Phys

Scientific paper

10.1063/1.2129261

We use a microscopic density functional theory based on Wertheim's first order thermodynamic perturbation theory to study wetting behavior of athermal mixtures of colloids and excluded-volume polymers. In opposition to the wetting behavior of the Asakura-Oosawa-Vrij model we find the polymer-rich phase to wet a hard wall. The wetting transition is of the first order and is accompanied by the prewetting transition. We do not find any hints for the layering transitions in the partial wetting regime. Our results resemble the wetting behavior in athermal polymer solutions. We point out that an accurate, monomer-resolved theory for colloid-polymer mixtures should incorporate the correct scaling behavior in the dilute polymer regime and an accurate description of the reference system.

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