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Updated: Mar 5, 2026

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
Published on: February 23, 2017
Effect of Porosity and Concentration Polarization on Electrolyte Diffusive Transport Parameters through Ceramic
Virginia Romero1, Victor Vega2, Javier García3
1Applied Physics Department I, Faculty of Sciences, University of Malaga, E-29071 Málaga, Spain. virgirom@uma.es.
Abstract:
Diffusive transport through nanoporous alumina membranes (NPAMs) produced by the two-step anodization method, with similar pore size but different porosity, is studied by analyzing membrane potential measured with NaCl solutions at different concentrations. Donnan exclusion of co-ions at the solution/membrane interface seem to exert a certain control on the diffusive transport of ions through NPAMs with low porosity, which might be reduced by coating the membrane surface with appropriated materials, as it is the case of SiO₂. Our results also show the effect of concentration polarization at the membrane surface on ionic transport numbers (or diffusion coefficients) for low-porosity and high electrolyte affinity membranes, which could mask values of those characteristic electrochemical parameters.
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