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Sorption and permeation of solutions of chloride salts, water and methanol in a Nafion membrane

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García Villaluenga, Juan Pedro and Barragán García, Vicenta María and Seoane Rodríguez, Benjamín and Ruiz Bauzá, Carlos (2006) Sorption and permeation of solutions of chloride salts, water and methanol in a Nafion membrane. Electrochimica Acta, 51 (28). pp. 6297-6303. ISSN 0013-4686

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Official URL: http://dx.doi.org/10.1016/j.electacta.2006.04.011


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Abstract

The sorption of water-methanol mixtures containing a dissolved chloride salt in a Nafion 117 membrane, and their transport through the membrane under the driving force of a pressure gradient, have been studied. Both type of experiments was performed by using five different salts: lithium chloride, sodium chloride, cesium chloride, magnesium chloride and calcium chloride. It was observed that both the permeation flow through the membrane and the membrane swelling increase significantly with the methanol content of the solutions. These facts are attributed to the increase in wet membrane porosity, which brings about the increase of the mobility of solvents in the membrane, besides the increase of the mobility of the polymer pendant chains. In contrast, the influence of the type of electrolyte on the membrane porosity and permeability is not very important, with the exception of the CsCl solutions, which is probably due to the small hydration ability of the Cs+ ion.


Item Type:Article
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© 2006 Elsevier Ltd.

Uncontrolled Keywords:Ion-Exchange Membranes, Polymer Electrolyte Membranes, Fuel-Cells, Ionomer Membranes, Transport-Properties, Solvent Transport, Self-Diffusion, Mixtures, Counterions, Radiotracer.
Subjects:Sciences > Physics > Thermodynamics
ID Code:20666
Deposited On:08 Apr 2013 10:15
Last Modified:11 Mar 2016 16:55

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