Polyelectrolyte adsorption

نویسندگان

  • David ANDELMAN
  • Jean-François JOANNY
  • D. Andelman
  • J.-F. Joanny
چکیده

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.  2000 Académie des sciences/Éditions scientifiques et médicales Elsevier SAS polyelectrolyte / adsorption / colloidal particles / multilayers Adsorption de polyélectrolytes Résumé. Nous discutons les approches théoriques qui permettent d’étudier les polymères chargés qui s’adsorbent sur une surface plane dans deux situations : l’adsorption d’un polymère isolé et l’adsorption à partir d’une solution lorsque le solvant est un solvant θ. Nous considérons séparément le comportement de polymères rigides et flexibles en fonction de divers paramètres physicochimiques comme la charge du polymère, la charge de la surface, la force ionique de la solution et la concentration en polymère. Nous décrivons essentiellement les modèles de type champ moyen, mais nous discutons aussi brièvement l’effet des fluctuations. L’adsorption de polyélectrolytes est capitale pour l’étude de la stabilité de suspensions colloïdales. Dans cette optique, nous mentionnons aussi des études sur les forces entre deux surfaces planes en présence de polyélectrolytes. Enfin, nous présentons le problème de l’inversion de charge et son application à la formation de multicouches polyélectrolytes sur des surfaces planes et des particules colloïdales.  2000 Académie des sciences/Éditions scientifiques et médicales Elsevier SAS polyélectrolyte / adsorption / particules colloïdales / multicouches Note présentée par Guy LAVAL. S1296-2147(00)01130-6/FLA  2000 Académie des sciences/Éditions scientifiques et médicales Elsevier SAS. Tous droits réservés. 1153 D. Andelman, J.-F. Joanny POLYMERS AT INTERFACES

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تاریخ انتشار 2000