Abstract
The electrokinetic properties of commercial titania and TiO2-SiO2 oxide composite, precipitated from an emulsion system with cyclohexane as the organic phase, are described. To extend the possible range of applications of the TiO2-SiO2 oxide composite, its surface was modified with selected alkoxysilanes: N-2-(aminoethyl)-3-aminopropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane and vinyltrimethoxysilane. Modification with selected alkoxysilanes leads to the introduction of new chemical groups on the TiO2-SiO2 surface, which changes its initial properties and also the surface charge, manifested by the values of zeta potential. This study was undertaken to establish the effect of the type and amount of the modifier and type and ionic strength of the electrolyte on the zeta potential of the modified TiO2-SiO2 oxide composite and thus on the stability of the colloidal system. The powders were characterised by FTIR and elemental analysis to confirm the effectiveness of the surface modification. The structure of TiO2-SiO2 oxide composite was resolved by the wide-angle X-ray scattering method.
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This work was supported by the Polish National Centre of Science research grant no. 2011/01/B/ST8/03961.
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Nowacka, M., Siwińska-Stefańska, K. & Jesionowski, T. Structural characterisation of titania or silane-grafted TiO2-SiO2 oxide composite and influence of ionic strength or electrolyte type on their electrokinetic properties. Colloid Polym Sci 291, 603–612 (2013). https://doi.org/10.1007/s00396-012-2762-3
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DOI: https://doi.org/10.1007/s00396-012-2762-3