Abstract
The effects of organosulphonate groups on the ion-exchange and ion-transport properties of silica hydrogels have been investigated by using Ru(NH 3) 6 3+, Ru(bpy) 3 2+ and Fe(CN) 6 3− redox probes. Silica and sulphonated ormosil hydrogels were prepared by using tetramethyl orthosilicate as a silica precursor and 2(4-chlorosulphonylphenyl)ethyl-trichlorosilane to provide sulphonate functionality for ion-exchange and ion conductivity. Both gels act as cation-exchangers and exclude Fe(CN) 6 3−. Partition coefficients are higher for the ormosil and for the more highly charged Ru(NH 3) 6 3+ versus Ru(bpy) 3 2+. Diffusion coefficients are higher for the unmodified silica, which is consistent with weaker interactions between the cationic probes and less anionic gel network.
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