Polyelectrolyte adsorption |
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Institution: | 1. MINES ParisTech, PSL Research University, GEOSCIENCES - Centre for Geosciences and Geoengineering, 35 rue St Honoré, F-77305 Fontainebleau, France;2. Laboratoire des Sciences du Climat et de l''Environnement/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Avenue de la Terrasse, F-91198 Gif-sur-Yvette CEDEX, France |
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Abstract: | The problem of charged polymer chains (polyelectrolytes) as they adsorb on a planar surface is addressed theoretically. We review the basic mechanisms and theory underlying polyelectrolyte adsorption on a single surface in two situations: adsorption of a single charged chain, and adsorption from a bulk solution in θ solvent conditions. The behavior of flexible and semi-rigid chains is discussed separately and is expressed as function of the polymer and surface charges, ionic strength of the solution and polymer bulk concentration. We mainly review mean-field results and briefly comment about fluctuation effects. The phenomenon of polyelectrolyte adsorption on a planar surface as presented here is of relevance to the stabilization of colloidal suspensions. In this respect we also mention calculations of the inter-plate force between two planar surfaces in presence of polyelectrolyte. Finally, we comment on the problem of charge overcompensation and its implication to multi-layers formation of alternating positive and negative polyelectrolytes on planar surfaces and colloidal particles. |
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