Adsorption and Depletion of Polyelectrolytes from Charged Surfaces

Details Adsorption and Depletion of Polyelectrolytes from Charged Surfaces Adsorption and Depletion of Polyelectrolytes from Charged Surfaces

2003-02-06

arxiv.org/abs/cond-mat/0302126v2

J. Chem. Phys. 119, 2355 (2003)

Physics

Condensed Matter

Soft Condensed Matter

12 pages, 8 figures, final version to be published in J. Chem. Phys. 2003

Scientific paper

10.1063/1.1580798

Mean-field theory and scaling arguments are presented to model polyelectrolyte adsorption from semi-dilute solutions onto charged surfaces. Using numerical solutions of the mean-field equations, we show that adsorption exists only for highly charged polyelectrolytes in low salt solutions. Simple scaling laws for the width of the adsorbed layer and the amount of adsorbed polyelectrolyte are obtained. In other situations the polyelectrolyte chains will deplete from the surface. For fixed surface potential conditions, the salt concentration at the adsorption--depletion crossover scales as the product of the charged fraction of the polyelectrolyte f and the surface potential, while for a fixed surface charge density, \sigma, it scales as \sigma^{2/3}f^{2/3}, in agreement with single-chain results.

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