Preparation of spherical,mixed SiO2/TiO2 particles by the sol technique |
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| Authors: | M H Selle J Sjöblom R Lindberg |
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| Institution: | (1) Department of Chemistry, University of Bergen, Allégaten 41, 5007 Bergen, Norway;(2) Laboratory of Physical Chemistry and Electrochemistry, Helsinki University of Technology, Kemistintie 1, 02150 Espoo, Finland |
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| Abstract: | Preparation of silica, titania and mixed silica/titania particles has been studied. The region for formation of monodisperse SiO2 particles in the phase diagram tetraethyl orthosilicate (TEOS)-ethanol-H2O was studied as a function of NH3 concentration at room temperature. Titania particles could be prepared at lowered temperatures and concentration of ammonia up to 0.01 M. The size of SiO2 particles was 0.03–1  m whereas TiO2 particles were size range 0.5–0.8 m. Mixed SiO2/TiO2 particles were prepared from prehydrolyzed TEOS/EtOH solutions by adding tetraethyl orthotitanate (TEOT). This was accomplished at 3°C and slightly alkaline solutions. The final particle size of the mixed particles was about 0.3 m. |
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| Keywords: | Silica titania mixed silica/titania particles preparation sol technique |
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