Microscopic theory of solvent-mediated long-range forces: Influence of wetting

被引:22
作者
Archer, AJ
Evans, R
Roth, R
机构
[1] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England
[2] Max Planck Inst Met Res, D-70569 Stuttgart, Germany
[3] Univ Stuttgart, ITAP, F-70569 Stuttgart, Germany
来源
EUROPHYSICS LETTERS | 2002年 / 59卷 / 04期
关键词
D O I
10.1209/epl/i2002-00137-2
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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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页码:526 / 532
页数:7
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