Formation and physicochemical properties of silica fillers precipitated in emulsion medium
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Poznan University of Technology
Beata Kurc   

Poznan University of Technology, Institute of Chemical Technology and Engineering, Pl. M. Skłodowskiej-Curie 2, 60-965 Poznan, Poland
Publication date: 2008-01-01
Physicochem. Probl. Miner. Process. 2008;42(1):67–74
The studies were performed on production of silica particles in emulsion medium. Precipitation of silicon dioxide was performed from aqueous solutions of sodium metasilicate and hydrochloric acid. A non-ionic surfactant (Rokanol K7) was applied as the emulsifier. Heptane formed the organic phase. Optimum compositions of emulsion and appropriate parameters of silica precipitation were de- termined. Particle size and morphology of the formed dispersions were examined using scanning elec- tron microscopy (SEM). Dispersion character of the examined colloids was also defined using the non-invasive back scattering method (NIBS). Moreover, studies were conducted on sedimentation and wettability of the products with water and, at the final stage, adsorptive analysis was conducted.