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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
biochemistry, genetics and molecular biology
Polymer inclusion membranes: The concept of fixed sites membrane revised
Journal of Membrane Science, Volume 290, No. 1-2, Year 2007
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Description
The mechanism of facilitated transport of metal ions across polymer inclusion membranes (PIMs) is revised on the basis of transport flux measurements and of new data brought by techniques sensitive to local inter-molecular interactions and molecular diffusion. Cellulose triacetate (CTA) membranes built with two types of inclusion carriers: a liquid one Aliquat 336 and a crystalline one Lasalocid A, both able to carry metal ions across PIMs and supported liquid membranes (SLMs) made of the same components, have been compared. Both PIM systems show similar effects for what concern the need of a carrier threshold concentration for the occurrence of a transport flux across PIM as revealed by flux and fluorescence correlation spectroscopy (FCS) measurements, and the dependence of the chemical nature of plasticizers on the metal ion flux. These systems also present similar Raman and far IR signatures of structural evolution of PIMs with the increase of the carrier concentration within the CTA matrix. All the presented data are interpreted as concern PIMs, according to an evolution of chemical interactions between components of the polymeric membrane able to lead to a phase transition. This phase transition type of the carrier-plasticized polymer system is induced by the increase of carrier concentration in the polymer chains. The PIM progressively organizes itself like a liquid SLM because of the enhancement of preferential solvent interactions between the carrier and the plasticizer. The main conclusion of this study is that the classically adopted "hopping" transport mechanism between fixed carrier sites in a PIM does not apply to such carrier chemically unbound to polymer membrane systems. © 2006 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Fontàs, Clàudia
Spain, Girona
Universitat de Girona
Tayeb, Rafik
Tunisia, Soliman
Centre de Recherches et Des Technologies Des Eaux
Dhahbi, Mahmoud
Tunisia, Soliman
Centre de Recherches et Des Technologies Des Eaux
Gaudichet, Emmanuelle
France, Paris
Arts et Metiers Institute of Technology
Thominette, Francette
France, Paris
Arts et Metiers Institute of Technology
Roy, P.
France
Unité de Recherche Soleil
Steenkeste, Karine
France, Paris
Cnrs Centre National de la Recherche Scientifique
Fontaine-Aupart, Marie Pierre
France, Paris
Cnrs Centre National de la Recherche Scientifique
Tingry, Sophie
France, Montpellier
Institut Européen Des Membranes Umr5635
Tronel-Peyroz, Emmanuel
France, Montpellier
Institut Européen Des Membranes Umr5635
Seta, Patrick
France, Montpellier
Institut Européen Des Membranes Umr5635
Statistics
Citations: 140
Authors: 11
Affiliations: 6
Identifiers
Doi:
10.1016/j.memsci.2006.12.019
ISSN:
03767388