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The Influence of Cations on Growth Kinetics of Silica Aggregates

  • Theo P.M. Beelen (a1), Peter W.J.G. Wijnen (a1), Kees P.J. Rummens (a1) and Rutger A. Van Santen (a1)


Silica gels are prepared by acidification (pH = 2 − 4) of water glass. SAXS measurements show that the gel consists of fractal aggregates (D = 2.2). Although the fractal dimension is not influenced by addition of cations, Al3+ and Mg2+ retard the growth of the fractal aggregates, while TMA+ has a promoting effect.



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