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Correlations between water uptake and effective fixed charge concentration at high univalent electrolyte concentrations in sulfonated polymer cation-exchange membranes with different morphology

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Barragán García, Vicenta María and Pérez Haro, M. J. (2011) Correlations between water uptake and effective fixed charge concentration at high univalent electrolyte concentrations in sulfonated polymer cation-exchange membranes with different morphology. Electrochimica Acta, 56 (24). pp. 8630-8637. ISSN 0013-4686

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Official URL: http://dx.doi.org/10.1016/j.electacta.2011.07.060


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Abstract

Water uptakes properties and effective fixed charge concentration have been determined in aqueous electrolyte solutions (LiCl, NaCl and KCl) for different commercial sulfonated polymer cation-exchange membranes with different morphology. Differences in the water uptake properties and in the membrane effective fixed charge concentration has been found, which have been analyzed on the basis of the different membrane structures. The experimental results show correlations between the water uptake and the loss of the membrane selectivity at high electrolyte concentrations which are dependent on the membrane morphology. Relationships are found which permit to estimate the membrane effective fixed charge concentration from equilibrium and morphological properties with the advantage of avoiding the need for membrane potential measurements.


Item Type:Article
Additional Information:

The authors of this study gratefully acknowledge Prof. C. Larchet and Prof. V. Nikonenko for donating MK40 membrane samples, and ICTS Centro Nacional de Microscopia UCM for AFM image. Financial
support from Universidad Complutense of Madrid under Project
PR1/08-15918-A is also gratefully acknowledged.

Uncontrolled Keywords:Transport-Properties, Electroosmotic Transport, Methanol, Inhomogeneity, Microstructure, Permeation, Potentials, Behavior.
Subjects:Sciences > Physics > Thermodynamics
ID Code:20372
Deposited On:05 Apr 2013 11:24
Last Modified:11 Mar 2016 14:21

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