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

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

2008-10-02

arxiv.org/abs/0810.0510v1

J. Chem. Phys. 129, 124506 (2008)

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 4 figures

Scientific paper

10.1063/1.2982163

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 $a \to 0$.

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