Potential of mean force and the charge reversal of rodlike polyions

Details Potential of mean force and the charge reversal of rodlike polyions Potential of mean force and the charge reversal of rodlike polyions

2005-06-23

arxiv.org/abs/cond-mat/0506602v1

Molecular Physics 103, 2951-2956 (2005)

Physics

Condensed Matter

Statistical Mechanics

To be published in the special issue of Molecular Physics in honor of Prof. Ben Widom

Scientific paper

10.1080/00268970500185930

A simple model is presented to calculate the potential of mean force between a polyion and a multivalent counterion inside a polyelectrolite solution. We find that under certain conditions the electrostatic interactions can lead to a strong attraction between the polyions and the multivalent counterions, favoring formation of overcharged polyion-counterion complexes. It is found that small concentrations of salt enhance the overcharging, while an excessive amount of salt hinders the charge reversal. The kinetic limitations to overcharging are also examined.

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