Polyelectrolyte brushes with added salt

N. Arun Kumar, Christian Seidel*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

86 Scopus citations

Abstract

Using molecular dynamics simulations, we study completely charged polyelectrolyte brushes with added salt at moderate electrostatic coupling strength. The full Coulomb interaction of monomers, counterions, and salt ions is treated explicitly. In the (nonlinear) osmotic brush regime, the brush thickness h is found to decrease with the salt concentration cs, obeying a weak power law, h ∼ cs -1/3. This result is in agreement with the scaling prediction by Pincus. The transverse ion distribution obtained in the simulations can be understood by means of a modified Donnan approach which takes into account the self-volume of polyelectrolyte chains.

Original languageEnglish (US)
Pages (from-to)9341-9350
Number of pages10
JournalMacromolecules
Volume38
Issue number22
DOIs
StatePublished - Nov 1 2005
Externally publishedYes

ASJC Scopus subject areas

  • Materials Chemistry

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