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Article Dans Une Revue Langmuir Année : 2011

Calcium Mediated Polyelectrolyte Adsorption on Like-Charged Surfaces

Résumé

Monte Carlo simulations within the primitive model of calcium-mediated adsorption of linear and comb polyelectrolytes onto like-charged surfaces are described, focusing on the effect of calcium and polyion concentrations as well as on the ion pairing between polymers and calcium ions. We use a combination of Monte Carlo simulations and experimental data from titration and calcium binding to quantify the ion pairing. The polymer adsorption is shown to occur as a result of surface overcharging by Ca2+ and ion pairing between charged monomers and Ca2+. In agreement with experimental observations, the simulations predict that the polymer adsorption isotherm goes through a maximum as the calcium or the polymer concentration is increased. The non-Langmuir isotherms are rationalized in terms of charge-charge correlations.
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Dates et versions

hal-00650062 , version 1 (09-12-2011)

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Martin Turesson, Christophe Labbez, André Nonat. Calcium Mediated Polyelectrolyte Adsorption on Like-Charged Surfaces. Langmuir, 2011, 27 (22), pp.13572-13581. ⟨10.1021/la2030846⟩. ⟨hal-00650062⟩
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