Colloidal silicas obtained via co-precipitation methodusing cyclohexane as an organic phase
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Poznan University of Technology
Publication date: 2007-01-01
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Beata Tepper   

Poznan University of Technology, Institute of Chemical Technology and Engineering, pl. M. Skłodowskiej-Curie 2, 60-965 Poznan, Poland
Physicochem. Probl. Miner. Process. 2007;41(1):195-203
The process of obtaining colloidal silicas from the emulsion systems with the use of cyclohexane as the organic phase has been studied and the products obtained have been also characterised. The emulsion systems made of water solutions of sodium metasilicate and hydrochloric acid or alternatively sulfuric acid have been used. Non-ionic surfactants have been used as emulsifiers, while a homogeniser has been a dispersing tool. The optimum compositions of the emulsion systems and the optimum parameters of silicas precipitation have been established. The dispersion character of the colloids obtained has been examined and the shapes, size and morphology of the SiO2 particles formed have been analysed (including a tendency to agglomerate formation and polydispersity).
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