Polyelectrolytes in the presence of multivalent ions: gelation versus segregation

Details Polyelectrolytes in the presence of multivalent ions: gelation versus segregation Polyelectrolytes in the presence of multivalent ions: gelation versus segregation

2002-11-21

arxiv.org/abs/cond-mat/0211491v1

Physics

Condensed Matter

Scientific paper

10.1103/PhysRevLett.90.125504

We analyze solutions of strongly charged chains bridged by linkers such as multivalent ions. The gelation induced by the strong short range electrostatic attractions is dramatically suppressed by the long range electrostatic correlations due to the charge along the uncrosslinked monomers and ions. A modified Debye-Huckel approach of crosslinked clusters of charged chains is used to determined the mean field gelation transition self-consistently. Highly dilute polyelectrolyte solutions tend to segregate macroscopically. Semidilute solutions can form gels if the Bjerrum length $l_B$ and the distance between neighboring charged monomers along the chain $b$ are both greater than the ion size $a$.

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