Commun. Comput. Phys., 7 (2010), pp. 235-249.


Charge Renormalization, Thermodynamics, and Structure of Deionized Colloidal Suspensions

Ben Lu 1, Alan R. Denton 1*

1 Department of Physics, North Dakota State University, Fargo, ND 58108-6050, USA.

Received 20 August 2008; Accepted (in revised version) 5 December 2008
Available online 24 August 2009
doi:10.4208/cicp.2009.08.203

Abstract

In charge-stabilized colloidal suspensions, highly charged macroions, dressed by strongly correlated counterions, carry an effective charge that can be substantially reduced (renormalized) from the bare charge. Interactions between dressed macroions are screened by weakly correlated counterions and salt ions. Thermodynamic and structural properties of colloidal suspensions depend sensitively on the magnitudes of both the effective charge and the effective screening constant. Combining a charge renormalization theory of effective electrostatic interactions with Monte Carlo simulations of a one-component model, we compute osmotic pressures and pair distribution functions of deionized colloidal suspensions. This computationally practical approach yields close agreement with corresponding results from large-scale simulations of the primitive model up to modest electrostatic coupling strengths.


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PACS: 82.70.Dd, 83.70.Hq, 05.20.Jj, 05.70.-a
Key words: Charged colloids, charge renormalization, effective interactions, structure, Monte Carlo simulation.

*Corresponding author.
Email: benlu.p@gmail.com (B. Lu), alan.denton@ndsu.edu (A. R. Denton)
 

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