Salt-induced collapse and reexpansion of highly charged flexible polyelectrolytes

Pai Yi Hsiao, Erik Luijten*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

171 Scopus citations


We study the salt-dependent conformations of dilute flexible polyelectrolytes in solution via computer simulations. Low concentrations of multivalent salt induce the known conformational collapse of individual polyelectrolyte chains, but as the salt concentration is increased further this is followed by a reexpansion. We explicitly demonstrate that multivalent counterions can overcompensate the bare charge of the chain in the reexpansion regime. Both the degree of reexpansion and the occurrence of overcharging sensitively depend on ion size. Our findings are relevant for a wide range of salt-induced complexation phenomena.

Original languageEnglish (US)
Article number148301
JournalPhysical review letters
Issue number14
StatePublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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