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Phys Chem Chem Phys. 2013 Oct 14;15(38):16249-55. doi: 10.1039/c3cp52476k. Epub 2013 Sep 2.

Donnan potential of polyelectrolyte multilayer films made from poly-L-glutamic/polyallylamine hydrochloride and the stability of hexacyanoferrate retained in the films.

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Université de Strasbourg, Faculté de Chirurgie Dentaire, 1 Place de l'Hôpital, Strasbourg, France.


Polyelectrolyte multilayer films are a versatile surface functionalization method of solid-liquid interfaces and appear to be interesting reservoirs to load/release drugs and to act as permselective membranes. For the latter applications critical parameters are the porosity of the film and its Donnan potential. In this investigation the Donnan potential of PEI-(PGA-PAH)n (PEI, PGA and PAH stand for polyethyleneimine, poly-L-glutamic acid and polyallylamine) films will be determined as a function of the number of deposition steps and the concentration of the redox probe, hexacyanoferrate anions, for films made from 10 layer pairs. Complementarily, it will be shown that the retention of the redox probe in the films in the presence of 150 mM NaCl electrolyte depends on both the film thickness and the scan rates at which the electrochemical experiments are performed.

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