Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2006-08-07
Phys. Rev. E 74, 051408 (2006)
Physics
Condensed Matter
Soft Condensed Matter
Scientific paper
10.1103/PhysRevE.74.051408
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.
Castaneda-Priego Ramon
Lobaskin Vladimir
Mixteco-Sanchez J. C.
Rojas-Ochoa Luis F.
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