Critical Casimir Forces in Colloidal Suspensions

Details Critical Casimir Forces in Colloidal Suspensions Critical Casimir Forces in Colloidal Suspensions

2002-02-28

arxiv.org/abs/cond-mat/0202532v1

Physics

Condensed Matter

Statistical Mechanics

29 pages, 14 figures

Scientific paper

Some time ago, Fisher and de Gennes pointed out that long-ranged correlations in a fluid close to its critical point Tc cause distinct forces between immersed colloidal particles which can even lead to flocculation [C. R. Acad. Sc. Paris B 287, 207 (1978)]. Here we calculate such forces between pairs of spherical particles as function of both relevant thermodynamic variables, i.e., the reduced temperature t = (T-Tc)/Tc and the field h conjugate to the order parameter. This provides the basis for specific predictions concerning the phase behavior of a suspension of colloidal particles in a near-critical solvent.

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