2000/06/30 by Rene Messina, R. Messina, Christian Holm +3 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Charge (physics) #Charge density #Colloid #Coulomb #Counterion #Discretization #Electrostatics and Colloid Interactions #Material Dynamics and Properties #Pickering emulsions and particle stabilization #Surface charge #cond-mat.soft #cond-mat.stat-mech
paper · pdf · doi:10.1007/s101890170119
published as Eur. Phys. J. E vol. 4, pp. 363-370 (2001) · 16 pages, 16 ps figures, REVTEX, accepted for publication in EPJE
arxiv created 2000/12/21 · openalex publication_date 2001/03/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 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 charge inversion still persists even if strong pair association is observed.