Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2012-02-11
Physics
Condensed Matter
Soft Condensed Matter
9 pages, 7 figures
Scientific paper
We investigate the effects of image charges and interfacial charge discreteness on spherical electric double layers in electrolyte solutions with divalent counter-ions in the framework of the primitive model. By using Monte Carlo simulations and the image charge method, the zeta potential profile and the integrated charge distribution function are computed for varying surface charge strengths and for different salt concentrations. Systematic comparisons were carried out between three distinct models for interfacial charges: 1) SURF1 with uniform surface charges, 2) SURF2 with discrete point charges on the interface, and 3) SURF3 with discrete interfacial charges with finite excluding volume. Our results demonstrate that all these aspects, i.e., image charges, interfacial charge discreteness and valences, and their excluding volumes have important impacts on the zeta potential, and thus the structure of electric double layers.
Gan Zecheng
Xing Xiangjun
Xu Zhenli
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