Weak long-ranged Casimir attraction in colloidal crystals

A. Gopinathan; T. Zhou; S. N. Coppersmith; L. P. Kadanoff; D. G. Grier

doi:10.1209/epl/i2002-00481-1

Weak long-ranged Casimir attraction in colloidal crystals

A. Gopinathan, T. Zhou, S. N. Coppersmith, L. P. Kadanoff, D. G. Grier

Research output: Contribution to journal › Article › peer-review

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' properties.

Original language	English (US)
Pages (from-to)	451-457
Number of pages	7
Journal	Europhysics Letters
Volume	57
Issue number	3
DOIs	https://doi.org/10.1209/epl/i2002-00481-1
State	Published - 2002

ASJC Scopus subject areas

General Physics and Astronomy

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10.1209/epl/i2002-00481-1

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AU - Zhou, T.

AU - Coppersmith, S. N.

AU - Kadanoff, L. P.

AU - Grier, D. G.

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AB - 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' properties.

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Weak long-ranged Casimir attraction in colloidal crystals

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