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Agglomerate-Free Silica-Tin Oxide Particles

Published online by Cambridge University Press:  10 February 2011

Carsten Gellermann ,
Herbert Wolter  and
Werner Storch
Carsten Gellermann
Affiliation:
Fraunhofer-Institut für Silicatforschung, D-97082 Würzburg, Germany
Herbert Wolter
Affiliation:
Fraunhofer-Institut für Silicatforschung, D-97082 Würzburg, Germany
Werner Storch
Affiliation:
Fraunhofer-Institut für Silicatforschung, D-97082 Würzburg, Germany
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Abstract

Monodisperse silica-tin oxide particles of the core-shell type were prepared via a sol-gel process without formation of agglomerates. After synthesis of silica cores the surface was coated with tin oxide by controlled hydrolysis and condensation of tin(IV) tertiary butoxide. Particle properties were characterized by electron microscopy, dynamic light scattering, N2-sorption (BET), zeta potential and X-ray fluorescence analysis. As a consequence of the variable content of tin oxide numerous possible applications arise, for example introducing X-ray opacity in dental filling materials. In order to use such particles as fillers, an additional surface functionalization with 3-methacryloxypropyltrimethoxysilane was created matching the C=C-functional groups of the polymer resins, e.g. ORMOCER*s. Characterization methods such as diffuse reflectance infrared Fourier transform spectroscopy and elemental analysis were used to confirm the surface coverage.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 520: Symposium P – Nanostructured Powders & Their Industrial Application , 1998 , 185
Copyright
Copyright © Materials Research Society 1998

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References

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