8th Liquid Matter Conference September 6-10, 2011 Wien, Austria ...

Wed 711:10-14:00P5.167Electrostatic potential around a spherical charged colloidwith ion strong couplingMasayuki Uranagase 1 and Ryoichi Yamamoto 11 Kyoto University, Kyoto-Daigaku Katsura, Nishikyo-ku, 615-8510, Kyoto, JapanPoisson-Boltzmann(PB) equation, which is based on the mean field approximation, is one of themain tools for the analysis of the electrostatic properties of charged colloidal systems. However,this equation becomes useless when an electrolyte solution contain multivalent ions and/or permittivityof the solvent becomes low because the electrostatic correlation cannot be ignored anymore.In this talk, we discuss the possibility that PB equation predicts the actual electrostatic potentialexcept proximity of the surface of the colloidal particle. Specifically, by use of molecular dynamicssimulation, we compute the electrostatic potential around a fixed spherical charged colloidalparticle in an electrolyte solution in the case that the electrostatic correlation becomes strong. Thenwe show that the electrostatic potential obtained from the simulation can be fitted by the solutionof PB equation with two adjustable parameters and we also discuss the relation between theseadjustable parameters and the electrostatic correlation.167