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Study of the internal morphology of cation-exchange membranes by means of electroosmotic permeability relaxations.

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Barragán García, Vicenta María and Izquierdo Gil, María Amparo and Godino Gómez, María Paz and García Villaluenga, Juan Pedro (2009) Study of the internal morphology of cation-exchange membranes by means of electroosmotic permeability relaxations. Journal Of Physical Chemistry B, 113 (39). pp. 12952-12957. ISSN 1520-6106

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Official URL: http://pubs.acs.org/doi/pdf/10.1021/jp903414z


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Abstract

The effect of an ac sinusoidal perturbation of known amplitude and frequency superimposed to the usual dc
applied electric voltage difference on the electroosmotic flow through three cation-exchange membranes with different morphology has been studied. A dispersion of the electroosmotic permeability on the frequency of the applied ac signal has been found for the three membranes investigated, observing that the electroosmotic permeability reaches maximum values for some characteristic values of the frequency. These characteristic frequency values, which are related to relaxation processes in heterogeneous media, depend on the membrane system and permit to obtain information about the different structures of the membrane system. Thus, the study of the electroosmotic permeability relaxation can be used as a method to study the internal morphology of a cation-exchange membrane in a given electrolyte medium.


Item Type:Article
Additional Information:

© 2009 American Chemical Society. Financial support from the University
Complutense of Madrid under Project No. PR1/08-15918-A is
gratefully acknowledged. Professors C. Larchet and V. Nikonenko are gratefully acknowledged for donating MK40
samples

Uncontrolled Keywords:Ac Perturbation, Transport-Properties, Nafion, Water, Flow, Electrokinetics, Microcapillary, Permeation, Behavior, Methanol.
Subjects:Sciences > Physics > Thermodynamics
ID Code:20512
Deposited On:05 Apr 2013 12:02
Last Modified:09 Mar 2016 19:18

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