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Charge renormalization, effective interactions, and thermodynamics of deionized colloidal suspensions

A R Denton

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Thermodynamic properties of charge-stabilized 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.


PACS

82.70.Dd Colloids

64.60.A- Specific approaches applied to studies of phase transitions

65.20.-w Thermal properties of liquids

82.70.Kj Emulsions and suspensions

Subjects

Soft matter, liquids and polymers

Condensed matter: structural, mechanical & thermal

Chemical physics and physical chemistry

Dates

Issue 49 (10 December 2008)

Received 1 August 2008, in final form 15 September 2008

Published 12 November 2008



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