Weak Long-Ranged Casimir Attraction in Colloidal Crystals
Ajay Gopinathan, Tong Zhou, S. N. Coppersmith, L. P. Kadanoff, David G. Grier
Abstract
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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