Charge Renormalization, Effective Interactions, and Thermodynamics of Deionized Colloidal Suspensions

Details Charge Renormalization, Effective Interactions, and Thermodynamics of Deionized Colloidal Suspensions Charge Renormalization, Effective Interactions, and Thermodynamics of Deionized Colloidal Suspensions

2008-09-22

arxiv.org/abs/0809.3776v1

J. Phys.: Condens. Matter 20, 494230-1-8 (2008)

Physics

Condensed Matter

Soft Condensed Matter

15 pages, 7 figures

Scientific paper

10.1088/0953-8984/20/49/494230

Thermodynamic properties of charge-stabilised colloidal suspensions depend sensitively on the effective charge of the macroions, which can be substantially lower than the bare charge in the case of strong counterion-macroion association. A theory of charge renormalization is proposed, combining an effective one-component model of charged colloids with a thermal criterion for distinguishing between free and associated counterions. The theory predicts, with minimal computational effort, osmotic pressures of deionized suspensions of highly charged colloids in close agreement with large-scale simulations of the primitive model.

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