Determination of the zeta potential for highly charged colloidal suspensions

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 counter-ion 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.