Effect of colloidal charge discretization in the primitive model

Details Effect of colloidal charge discretization in the primitive model Effect of colloidal charge discretization in the primitive model

2000-06-30

arxiv.org/abs/cond-mat/0006502v3

Eur. Phys. J. E vol. 4, pp. 363-370 (2001)

Physics

Condensed Matter

Soft Condensed Matter

16 pages, 16 ps figures, REVTEX, accepted for publication in EPJE

Scientific paper

10.1007/s101890170119

The effect of fixed discrete colloidal charges in the primitive model is investigated for spherical macroions. Instead of considering a central bare charge, as it is traditionally done, we distribute \textit{discrete} charges randomly on the sphere. We use molecular dynamics simulations to study this effect on various properties such as overcharging, counterion distribution and diffusion. In the vicinity of the colloid surface the electrostatic potential may considerably differ from the one obtained with a central charge. In the strong Coulomb coupling, we showed that the colloidal charge discretization qualitatively influences the counterion distribution and leads to a strong colloidal charge-counterion pair association. However, we found that \textit{charge inversion} still persists even if strong pair association is observed.

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