Colloidal charge reversal: Dependence on the ionic size and the electrolyte concentration

Abstract

Extensive Monte Carlo simulations and scaling arguments are used to study the colloidal charge reversal. The critical colloidal surface charge density ${\sigma }_c$ at which the reversal first appears is found to depend strongly on the ionic size. We find that ${\sigma }_c$ has an inflection point as a function of the electrolyte concentration. The width of the plateau region in the vicinity of the inflection point depends on the temperature and the ionic radius $a$. In agreement with the theoretical predictions it is found that the critical colloidal charge above which the electrophoretic mobility becomes reversed diverges as $Z_c\sim 1/a^2$ in the limit $a\to 0$.

5 pages, 4 figures

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Cited by in corpus (6)

• A self-consistent renormalized Jellium approach for calculating structural and thermodynamic properties of charge stabilized colloidal suspensions
• A simulational and theoretical study of the spherical electrical double layer for a size-asymmetric electrolyte: the case of big coions
• The double-layer of penetrable ions: an alternative route to charge reversal
• On the nature of overcharging and charge inversion in electrical double layers
• Electric double layer for spherical particles in salt-free concentrated suspensions including ion size effects
• Non-mean-field screening by multivalent counterions