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The Physics of Overcharging

In: Traffic and Granular Flow ’03

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  • C. Holm

    (Max-Planck-Institut für Polymerforschung)

Abstract

Summary In this article we review the two basic mechanisms responsible for overcharging a single spherical colloid in the presence of aqueous salts. The first mechanism rests on energetic arguments, and deals only with the ground state configuration of the counterions. This mechanism can be qualitatively explained in very simple terms using freshmen electrostatics, and a very good quantitative description can be obtained using Wigner crystal theory. The second mechanism is driven by a combination of excluded volume correlations and the preceeding energetic arguments, and in the following called entropic overcharging. We demonstrate the validity of the proposed mechanisms with results of molecular dynamics simulations within the primitive model of electrolytes.

Suggested Citation

  • C. Holm, 2005. "The Physics of Overcharging," Springer Books, in: Serge P. Hoogendoorn & Stefan Luding & Piet H. L. Bovy & Michael Schreckenberg & Dietrich E. Wolf (ed.), Traffic and Granular Flow ’03, pages 475-488, Springer.
    • Handle: RePEc:spr:sprchp:978-3-540-28091-0_47
    DOI: 10.1007/3-540-28091-X_47
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