Membrane potentials of membranes with fixed ionic sites

A. van den Berg, P.D. van der Wal, M. Skowronska-Ptasinska, E.J.R. Sudholter, P. Bergveld, D.N. Reinhoudt

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    A theoretical model has been developed to simulate the formation of a membrane potential as a function of physically accessible parameters. The description is an extension of the well-known Teorell-Meyer-Sievers (TMS) model, now including free and fixed ionic sites and free and fixed neutral ligands. The model shows that selectivity loss appears as the molar ratio of [ligand]/[ionic site] < 1 in the case of fixed ionic sites. The effect of complete immobilization of the neutral ligand has been simulated by gradually decreasing the mobility ratio α of the cation-ligand complex and free cation in the membrane phase. At lower α, the membrane potential is reduced by a counteracting diffusion potential. This effect is not present if the product of the association constant β1, the total ligand concentration L and α is larger than 104. Furthermore, it is shown that cation permselectivity of ion-selective membranes that contain fixed anionic sites cannot be eliminated by the incorporation of an equal amount of fixed cationic sites.
    Original languageEnglish
    Pages (from-to)1-20
    Number of pages21
    JournalJournal of electroanalytical chemistry and interfacial electrochemistry
    Issue number1
    Publication statusPublished - 1990

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