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Ion exchange and ion transport properties of sulfonated organically modified silica hydrogels

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Abstract

Sulfonated ormosil hydrogels (~80% water) were prepared using tetramethyl orthosilicate as a silica precursor and 2(4-chlorosulfonylphenyl)ethyltrichlorosilane to provide sulfonate functionality for ion-exchange and ion conductivity. Ruthenium(III) hexamine was used as a redox probe in electrochemical studies performed on porous carbon fibre paper electrodes impregnated with the gel. The gel-modified electrodes extracted Ru(NH3)63+ from solutions in 0.1 M CF3CO2Na(aq) with a partition coefficient of ~36, and with ~100% of the sulfonate sites being accessible for ion exchange. The Ru(NH3)63+/2+ couple exhibited reversible and facile electrochemistry in the gel, with a Ru(NH3)62+ diffusion coefficient of 4.9×10−8 cm2 s−1 determined by chronoamperometry. This is an order of magnitude higher than the mobility of this complex in Nafion. The hydrogel-modified electrodes were stable for days, and could be repeatedly loaded with Ru(NH3)63+.

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Acknowledgements

This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) and Memorial University.

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Authors and Affiliations

  1. Department of Chemistry, Memorial University of Newfoundland, St. John’s, Newfoundland, A1B 3X7, Canada

    Wanda M. Aylward & Peter G. Pickup

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  1. Wanda M. Aylward
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  2. Peter G. Pickup
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Correspondence to Peter G. Pickup.

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Special Issue to celebrate the 70th birthday of Professor Zbigniew Galus

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Aylward, W.M., Pickup, P.G. Ion exchange and ion transport properties of sulfonated organically modified silica hydrogels. J Solid State Electrochem 8, 742–747 (2004). https://doi.org/10.1007/s10008-004-0540-y

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  • DOI: https://doi.org/10.1007/s10008-004-0540-y

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