# Colloidal charge reversal: Dependence on the ionic size and the electrolyte concentration - Condensed Matter > Soft Condensed Matter

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Abstract: Extensive Monte Carlo simulations and scaling arguments are used to study thecolloidal charge reversal. The critical colloidal surface charge density$\sigma c$ at which the reversal first appears is found to depend strongly onthe ionic size. We find that $\sigma c$ has an inflection point as a functionof the electrolyte concentration. The width of the plateau region in thevicinity of the inflection point depends on the temperature and the ionicradius $a$. In agreement with the theoretical predictions it is found that thecritical colloidal charge above which the electrophoretic mobility becomesreversed diverges as $Z c \sim 1-a^2$ in the limit $a \to 0$.

Autor: Alexandre Diehl, Yan Levin

Fuente: https://arxiv.org/