Microscopic theory of solvent mediated long range forces: influence of wetting

Details Microscopic theory of solvent mediated long range forces: influence of wetting Microscopic theory of solvent mediated long range forces: influence of wetting

2002-05-23

arxiv.org/abs/cond-mat/0205477v1

Europhys. Lett., 59 (4), pp. 526-532 (2002)

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 3 figures, submitted to Europhysics Letters

Scientific paper

10.1209/epl/i2002-00137-2

We show that a general density functional approach for calculating the force between two big particles immersed in a solvent of smaller ones can describe systems that exhibit fluid-fluid phase separation: the theory captures effects of strong adsorption (wetting) and of critical fluctuations in the solvent. We illustrate the approach for the Gaussian core model, a simple model of a polymer mixture in solution and find extremely attractive, long ranged solvent mediated potentials between the big particles for state points lying close to the binodal, on the side where the solvent is poor in the species which is favoured by the big particles.

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