Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 561709
Title On the origin of the membrane potential arising across densely charged ion exchange membranes : How well does the teorell-meyer-sievers theory work?
Author(s) Galama, A.H.; Post, J.W.; Hamelers, H.V.M.; Nikonenko, V.V.; Biesheuvel, P.M.
Source Journal of Membrane Science & Research 2 (2016)3. - ISSN 2476-5406 - p. 128 - 140.
Department(s) Environmental Technology
Physical Chemistry and Soft Matter
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Donnan equilibrium - Ion exchange membranes - Nernst-planck equation - Teorell-meyer-sievers (TMS) theory

A difference in salt concentration in two solutions separated by a membrane leads to an electrical potential difference across the membrane, also without applied current. A literature study is presented on proposed theories for the origin of this membrane potential (Φm). The most well-known theoretical description is Teorell-Meyer-Sievers (TMS) theory, which we analyze and extend. Experimental data for Φm were obtained using a cation exchange membrane (CMX, Neosepta) and NaCl solutions (salt concentration from 1 mM to 5 M). Deviations between theory and experiments are observed, especially at larger salt concentration differences across the membrane. At a certain salt concentration ratio, a maximum in Φm is found, not predicted by the TMS theory. Before the maximum, TMS theory can be used as a good estimate of ?m though it overestimates the actual value. To improve the theory, various corrections to TMS theory were considered: A) Using ion activities instead of ionic concentration in the external solutions leads to an improved prediction; B) Inhomogeneous distribution of the membrane fixed charge has no effect on Φm; C) Consideration of stagnant diffusion layers on each side of the membrane can have a large effect on Φm; D) Reducing the average value of the fixed membrane charge density can also largely affect ?m; E) Allowing for water transport in the theory has a small effect; F) Considering differences in ionic mobility between co-ions and counterions in the membrane affects Φm significantly. Modifications C) and F) may help to explain the observed maximum in Φm.

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