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4 results on '"Selle M"'

1. Studies of gelation of tetraethoxysilane in w/o microemulsions stabilized by nonionic surfactants NMR and phase equilibria.

Author

Kilian, H.-G., Lagaly, G., Lindman, B., Stenius, P., Selle, M. H., Sjöblom, J., Friberg, S. E., Young, T., and Yang, C.-C.

Abstract

Acidic nonionic microemulsions have been used for gelation of tetraethyl orthosilicate (TEOS). It is shown that the release of ethanol will expand the microemulsion region after reaction. The gelation in the nonionic microemulsion (without hydrocarbon) is strongly dependent on surfactant and water. The gelation time strongly increases when surfactant is in excess of 22% by weight. The NMR spectra revealed only a minor reorganization during 4 months of the ethoxy attached to the Si atom for solutions with insufficient amount of water for gelation. This did not change with time (up to 4 months). All-in-all, the reactions with TEOS in acidic microemulsions are similar to those in organic solvents. [ABSTRACT FROM AUTHOR]

Published
1992
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3. Preparation of spherical, mixed SiO2/TiO2 particles by the sol technique

Author

Selle, M. H., Sjöblom, J., and Lindberg, R.

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 µm whereas TiO2 particles were size range 0.5–0.8 µm. 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 µm.

Published
1995
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