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Electrically Controlled Flame Synthesis of Nanophase TiO2, SiO2, and SnO2 Powders

Published online by Cambridge University Press:  31 January 2011

Srinivas Vemury ,
Sotiris E. Pratsinis  and
Lowinn Kibbey
Srinivas Vemury
Affiliation:
Department of Chemical Engineering, University of Cincinnati, Cincinnati, Ohio 45221–0171
Sotiris E. Pratsinis*
Affiliation:
Department of Chemical Engineering, University of Cincinnati, Cincinnati, Ohio 45221–0171
Lowinn Kibbey
Affiliation:
Department of Chemical Engineering, University of Cincinnati, Cincinnati, Ohio 45221–0171
*
b)Author to whom correspondence should be addressed.
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Abstract

Nanophase particles with precisely controlled characteristics are made by oxidation of their halide vapors in electrically assisted hydrocarbon flames using needle-shaped or plate electrodes. The particle size and crystallinity decrease with increasing field strength across the flame. The field generated by the electrodes across the flame decreases the particle residence time in the high temperature region of the flame. Furthermore, it charges the newly formed particles, resulting in electrostatic repulsion and dispersion that decreases particle growth by coagulation. Electric fields reduced the primary particle size of TiO2, the agglomerate size of SnO2, and both the agglomerate and primary size of SiO2.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 4 , April 1997 , pp. 1031 - 1042
Copyright
Copyright © Materials Research Society 1997

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