Weak Long-Ranged Casimir Attraction in Colloidal Crystals

Details Weak Long-Ranged Casimir Attraction in Colloidal Crystals Weak Long-Ranged Casimir Attraction in Colloidal Crystals

2001-07-12

arxiv.org/abs/cond-mat/0107274v1

Physics

Condensed Matter

Soft Condensed Matter

5 pages 2 figures ReVTeX

Scientific paper

10.1209/epl/i2002-00481-1

We investigate the influence of geometric confinement on the free energy of an idealized model for charge-stabilized colloidal suspensions. The mean-field Poisson-Boltzmann formulation for this system predicts pure repulsion among macroionic colloidal spheres. Fluctuations in the simple ions' distribution provide a mechanism for the macroions to attract each other at large separations. Although this Casimir interaction is long-ranged, it is too weak to influence colloidal crystals' dynamics.

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