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Determination of the zeta potential for highly charged colloidal suspensions

By Giovanni Giupponi and Ignacio Pagonabarraga

Abstract

We compute the electrostatic potential at the surface, or zeta potential $\zeta$, of a charged particle embedded in a colloidal suspension using a hybrid mesoscopic model. We show that for weakly perturbing electric fields, the value of $\zeta$ obtained at steady state during electrophoresis is statistically indistinguishable from $\zeta$ in thermodynamic equilibrium. We quantify the effect of counterions concentration on $\zeta$. We also evaluate the relevance of the lattice resolution for the calculation of $\zeta$ and discuss how to identify the effective electrostatic radius.Comment: 8 pages, 3 figures with 2 panel

Topics: Condensed Matter - Soft Condensed Matter
Year: 2011
DOI identifier: 10.1098/rsta.2011.0024
OAI identifier: oai:arXiv.org:1102.4918
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