Macroion correlation effects in electrostatic screening and thermodynamics of highly charged colloids

Abstract

We study macroion correlation effects on the thermodynamics of highly charged colloidal suspensions using a mean-field theory and primitive model computer simulations. We suggest a simple way to include the macroion correlations into the mean-field theory as an extension of the renormalized jellium model of Trizac and Levin [Phys. Rev. E {\bf 69}, 031403 (2004)]. The effective screening parameters extracted from our mean-field approach are then used in a one-component model with macroions interacting via Yukawa-like potential to predict macroion distributions. We find that inclusion of macroion correlations leads to a weaker screening and hence smaller effective macroion charge and lower osmotic pressure of the colloidal dispersion as compared to other mean-field models. This result is supported by a comparison to primitive model simulations and experiments for charged macroions in the low-salt regime, where the macroion correlations are expected to be significant.

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• Electrostatic correlations: from Plasma to Biology
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• Statics and Dynamics of Strongly Charged Soft Matter
• Renormalized Jellium model for charge-stabilized colloidal suspensions
• Testing the relevance of effective interaction potentials between highly charged colloids in suspension
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• Equation of state of charged colloidal suspensions and its dependence on the thermodynamic route
• Ultrafiltration of charge-stabilized dispersions at low salinity
• Effective Electrostatic Interactions in Colloid-Nanoparticle Mixtures
• Poisson-Boltzmann cell model for heterogeneously charged colloids
• The renormalized Jellium model of colloidal suspensions with multivalent counterions
• Rotational self-diffusion in suspensions of charged particles: Revised Beenakker-Mazur and Pairwise Additivity methods versus numerical simulations
• Renormalized jellium model for colloidal mixtures
• Structural correlations and phase separation in binary mixtures of charged and uncharged colloids