&lt;title&gt;Particle growth, aggregation, and gelation of silicas&lt;/title&gt;

Bolt, P.H.; Dokter, Wim H.; Beelen, Theo P. M.; Santen, Rutger A. van

doi:10.1117/12.267194

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“…To understand the role of reaction conditions (temperature, pH, concentrations, salt addition) on the structure of the precursor sols and final gels, a number of investigations were performed. The mechanism of aggregation and the structure of the final gels were studied for pH values ranging from 2 to 10 which leads to a three-dimensional silica tetraedra network. , …”

Section: Introductionmentioning

confidence: 99%

“…The mechanism of aggregation and the structure of the final gels were studied for pH values ranging from 2 to 10 which leads to a three-dimensional silica tetraedra network. 3,4 Silica gels with high pH values, above 10, can be obtained by adding calcium ions to water glass solutions. 5,6 Provided silica concentration is high enough, a gel is obtained even under this strongly basic condition.…”

Section: Introductionmentioning

confidence: 99%

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Aggregation and Gel Formation in Basic Silico−Calco−Alkaline Solutions Studied: A SAXS, SANS, and ELS Study

et al. 1999

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Gelation of strongly basic silico−alkaline solutions was promoted by appropriate additions of calcium ions. The structure of the aggregates formed in the precursor sols and the resulting gels were studied, within a wide length scale, using small-angle X-ray, small-angle neutron, and elastic light scattering. The study of the kinetics of aggregation was performed in situ. The experimental results demonstrate that gels are composed of aggregates exhibiting a fractal structure, large particles formed in the solutions just after calcium addition and, in some cases, small primary particles remaining in the solution phase. The structural features of the gels are strongly dependent on the concentration of calcium ions. Reaction limited aggregation and diffusion-limited aggregation of primary silicate species are the predominant mechanisms of aggregation and gel formation in solutions with low and high calcium concentration, respectively.

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Section: Introductionmentioning

confidence: 99%