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Authors Abbas Bhatti, Q. ; Kaleem Baloch, M. ; Schwarz, S. ; Petzold, G.
Title Effect of various parameters on the stability of silica dispersions
Date 28.11.2014
Number 44423
Abstract For different practical applications, it is cardinal to maintain the stability of nanoparticles in aqueous suspension. The theoretical impact of pH and ultrasonication time on surface charge, particle size distribution and the dispersion stability of AEROSIL®OX 50 in water were evaluated, and a practical (centrifugal sedimentation analysis) test was used to determine the effects of concentration and molar mass of the polymer polyvinylpyrrolidone (PVP) at different pHs. It was observed that the size distribution of silica remains almost unaffected, but the surface charge increased with ultrasonication time up to 20 min and then leveled off. This increase in surface charge was proportional to the molar mass of the added polymer. The zeta potential increased with the increasing concentration of PVP in the silica suspension. This behavior is attributed to the adsorption of polymer over the surface of the particles. The suspensions were found to be the most stable, up to 36 %, at concentration (1 %) of PVP having higher molar masses. Furthermore, the addition of polymer strengthened the available agglomerates in the dispersion which resulted in the widening of the particles` size distribution.
Publisher Journal of Solution Chemistry
Wikidata
Citation Journal of Solution Chemistry 43 (2014) 1916-1928
DOI https://doi.org/10.1007/s10953-014-0260-6
Tags particle size distribution ultrasonication ph zeta potential surface charge molar mass of poly(vinylpyrrolidone) stability of silica dispersion

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