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Issue 4, 2009
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Permselective nanostructured membranes based on cellulose nanowhiskers

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Abstract

Nanostructured thin films of cellulose nanowhiskers derived from cotton were formed using a simple drop-coating procedure. The hydrogen-bonded cellulose films were stable in aqueous solutions and their permselective properties were probed using voltammetric techniques. The nanowhisker extraction procedure produces cellulose nanowhiskers with negatively-charged sulfate surface groups that inhibit the transfer of negatively-charged species through the nanowhisker membrane, while the diffusion of neutral species is only slightly hindered. Using rotating-disk electrode measurements, the diffusion of various species within the film was studied and it was shown that the positively-charged species, Ru(NH3)63+, was adsorbed by the film, whereas the negatively-charged species, IrCl63, was excluded by the film. The thermodynamics of adsorption of the positively-charged species by the cellulose nanoparticles were then studied using isotherm data. These observations open up new possibilities in electrochemical sensor development using renewable cellulosic materials as building blocks. Furthermore, charge-based permselective membranes can also be formed using free standing cellulose nanowhisker films, which offer the promise of renewable, selective membranes for separation technologies.

Graphical abstract: Permselective nanostructured membranes based on cellulose nanowhiskers

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Publication details

The article was received on 14 Oct 2008, accepted on 05 Jan 2009 and first published on 13 Feb 2009


Article type: Paper
DOI: 10.1039/B818056C
Citation: Green Chem., 2009,11, 531-537
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    Permselective nanostructured membranes based on cellulose nanowhiskers

    W. Thielemans, C. R. Warbey and D. A. Walsh, Green Chem., 2009, 11, 531
    DOI: 10.1039/B818056C

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