Volume 57, Number 3, February 2002
|Page(s)||451 - 457|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
Weak long-ranged Casimir attraction in colloidal crystals
Departmentt of Physics and James Franck Institute,
The University of Chicago
5640 S. Ellis Avenue, Chicago, IL 60637, USA
2 Physics Department, University of California - Santa Barbara, CA 93106-9530, USA
3 Physics Department, University of Wisconsin 1150 University Avenue, Madison, WI 53705, USA
Accepted: 7 November 2001
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.
PACS: 82.70.Dd – Colloids / 24.10.Pa – Thermal and statistical models / 05.70.Ce – Thermodynamic functions and equations of state
© EDP Sciences, 2002
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