Ionic Cloud Distribution close to a Charged Surface in the Presence of Salt

Details Ionic Cloud Distribution close to a Charged Surface in the Presence of Salt Ionic Cloud Distribution close to a Charged Surface in the Presence of Salt

2007-12-29

arxiv.org/abs/0801.0058v1

Europhys. Lett. 82, 48001 (2008)

Physics

Biological Physics

6 pages, 2 figures

Scientific paper

10.1209/0295-5075/82/48001

Despite its importance, the understanding of ionic cloud distribution close to a charged macroion under physiological salt conditions has remained very limited especially for strongly coupled systems with, for instance, multivalent counterions. Here we present a formalism that predicts both counterion and coion distributions in the vicinity of a charged macroion for an arbitrary amount of added salt and in both limits of mean field and strong coupling. The distribution functions are calculated explicitly for ions next to an infinite planar charged wall. We present a schematic phase diagram identifying different physical regimes in terms of electrostatic coupling parameter and bulk salt concentration.

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