Self-Consistent Field study of Polyelectrolyte Brushes

Details Self-Consistent Field study of Polyelectrolyte Brushes Self-Consistent Field study of Polyelectrolyte Brushes

2007-03-12

arxiv.org/abs/cond-mat/0703283v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1143/JPSJ.76.104601

We formulate a self-consistent field theory for polyelectrolyte brushes in the presence of counterions. We numerically solve the self-consistent field equations and study the monomer density profile, the distribution of counterions, and the total charge distribution. We study the scaling relations for the brush height and compare them to the prediction of other theories. We find a weak dependence of the brush height on the grafting density.We fit the counterion distribution outside the brush by the Gouy-Chapman solution for a virtual charged wall. We calculate the amount of counterions outside the brush and find that it saturates as the charge of the polyelectrolytes increases.

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