Dresden 2006 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 8: SYMPOSIUM Nonequilibrium Phenomena in Soft-Condensed Matter

CPP 8.2: Vortrag

Dienstag, 28. März 2006, 14:15–14:30, ZEU Lich

Numerical study of electrostatic colloidal interaction at interface — •Pavel Dyshlovenko¹ and Piotr Warszyński² — ¹Ulyanovsk State Technical University, 32 Severny Venets Street, Ulyanovsk 432027, Russia — ²Institute of Catalysis and Surface Chemistry, ul. Niezapominajek 8, 30-239 Kraków, Poland

Electrostatic interaction of a pair of colloidal particles immersed in electrolyte in the vicinity of a charged plane is studied numerically within the framework of the non-linear Poisson-Boltzmann equation in two dimensions. Particular attention is given to the many-particle effects and non-linearity. The question under consideration is related to the important practical problem of colloidal adsorption/deposition. The relevant details of numerical procedure are briefly discussed. The results of the numerical experiments indicate that the inter-particle interaction near a charged plane differs appreciably from the interaction of free particles. For the problem considered, the repulsion of two like-charged particles weakens for large values of plane’s charge, both positive and negative. In contrast, the repulsion exceeds the one of free particles when the wall is charged moderately.