Nanomaterials 2014, 4(3), 700-711; https://doi.org/10.3390/nano4030700
Effect of Porosity and Concentration Polarization on Electrolyte Diffusive Transport Parameters through Ceramic Membranes with Similar Nanopore Size
Virginia Romero 1,†, Victor Vega 2,†, Javier García 2,†, Victor M. Prida 2,†
, Blanca Hernando 2,† and Juana Benavente 1,*
, Blanca Hernando 2,† and Juana Benavente 1,*
1
Applied Physics Department I, Faculty of Sciences, University of Malaga, E-29071 Málaga, Spain
2
Physics Department, Faculty of Sciences, University of Oviedo, E-33007 Oviedo, Spain
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Received: 25 June 2014 / Revised: 21 July 2014 / Accepted: 22 July 2014 / Published: 6 August 2014
(This article belongs to the Special Issue Ordered Mesoporous Nanomaterials)
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. View Full-TextKeywords:
nanoporous alumina membranes (NPAMs); atomic layer deposition (ALD) surface coating; membrane potentials; concentration polarization
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Romero, V.; Vega, V.; García, J.; Prida, V.M.; Hernando, B.; Benavente, J. Effect of Porosity and Concentration Polarization on Electrolyte Diffusive Transport Parameters through Ceramic Membranes with Similar Nanopore Size. Nanomaterials 2014, 4, 700-711.
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