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28 March 2024
 
  » arxiv » cond-mat/0608163

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Macroion correlation effects in electrostatic screening and thermodynamics of highly charged colloids
Ramon Castaneda-Priego ; Luis F. Rojas-Ochoa ; Vladimir Lobaskin ; J. C. Mixteco-Sanchez ;
Date 7 Aug 2006
Subject Soft Condensed Matter; Statistical Mechanics
AbstractWe 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 {f 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.
Source arXiv, cond-mat/0608163
Other source [GID 514569] pmid17279910
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