Simple Model for Attraction between Like-Charged Polyions

Details Simple Model for Attraction between Like-Charged Polyions Simple Model for Attraction between Like-Charged Polyions

1998-06-29

arxiv.org/abs/cond-mat/9806358v2

Eur.Phys.J. B 12(1999)79

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 eps figures, also available at http://www.if.ufrgs.br/~arenzon Figure added and a more detailed discussion of con

Scientific paper

10.1007/s100510050980

We present a simple model for the possible mechanism of appearance of attraction between like charged polyions inside a polyelectrolyte solution. The attraction is found to be short ranged, and exists only in presence of multivalent counterions. The attraction is produced by the correlations in the condensed layers of counterions surrounding each polyion, and appears only if the number of condensed counterions exceeds the threshold, $ n > Z/2 \alpha $, where $\alpha$ is the valence of counterions and $Z$ is the polyion charge.

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