Membrane potentials of membranes with fixed ionic sites


Berg, A. van den and Wal, P.D. van der and Skowronska-Ptasinska, M. and Sudhölter, E.J.R. and Bergveld, P. and Reinhoudt, D.N. (1990) Membrane potentials of membranes with fixed ionic sites. Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 284 (1). pp. 1-20. ISSN 0022-0728

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Abstract: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.
Item Type:Article
Copyright:© 1990 Elsevier
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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