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Volume exclusion effects in the ground-state dominance approximation for polyelectrolyte adsorption on charged interfaces.

P M Biesheuvel
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Abstract

We consider the problem of polyelectrolyte molecules adsorbing on oppositely charged interfaces. For sufficiently long chains, the ground-state dominance approximation can be used which results in a (semi-)analytical solution of the self-consistent field equations (aSCF). Whereas existing aSCF theory assumes a low polyelectrolyte density, here the required electrostatic corrections for a high polymer density are implemented. Adsorbed polymer excludes volume for the solvent and small ions, a volume effect that also leads to a reduced dielectric permittivity and a resulting polarization term in the exchange potential. Calculations show the influence of volume exclusion on the polymer density profile.

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AdsorptionElectrolytesModels, ChemicalPolymersSurface PropertiesThermodynamicsJournal ArticleResearch Support, Non-U.S. Gov't

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P M Biesheuvel. 2005. Volume exclusion effects in the ground-state dominance approximation for polyelectrolyte adsorption on charged interfaces.. https://doi.org/10.1140/epje%2Fi2004-10085-1

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