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Role of particle evaporation during synthesis of lead oxide by aerosol decomposition

Published online by Cambridge University Press:  31 January 2011

Shirley W. Lyons ,
Yun Xiong ,
Timothy L. Ward ,
Toivo T. Kodas  and
Sotiris E. Pratsinis
Shirley W. Lyons
Affiliation:
Chemical and Nuclear Engineering Department, Center for Micro-Engineered Ceramics, University of New Mexico, Albuquerque, New Mexico 87131
Yun Xiong
Affiliation:
Chemical and Nuclear Engineering Department, Center for Micro-Engineered Ceramics, University of New Mexico, Albuquerque, New Mexico 87131
Timothy L. Ward
Affiliation:
Chemical and Nuclear Engineering Department, Center for Micro-Engineered Ceramics, University of New Mexico, Albuquerque, New Mexico 87131
Toivo T. Kodas
Affiliation:
Chemical and Nuclear Engineering Department, Center for Micro-Engineered Ceramics, University of New Mexico, Albuquerque, New Mexico 87131
Sotiris E. Pratsinis
Affiliation:
Department of Chemical Engineering, Center for Aerosol Processes, University of Cincinnati, Cincinnati, Ohio 45221
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Abstract

The role of product evaporation during lead monoxide (PbO) powder generation by aerosol decomposition (spray pyrolysis) was investigated at various temperatures in a flow reactor. Particles consisting of phase pure litharge and a mixture of litharge and massicot were formed with the dominant phase changing from litharge to massicot as the pyrolysis temperature was increased. Scanning electron microscopy showed particles produced at lower temperatures had a lumpy surface morphology and at higher temperatures appeared to be solid, indicated by the faceted surfaces and a plate-like morphology. Evaporative losses of PbOx, to the reactor walls were observed due to the substantial vapor pressure of PbOx. A simple model was developed that accounts for particle evaporation and mass transfer of lead oxide vapor to the reactor walls. This model suggested that the loss of lead oxide to the reactor walls was limited by diffusional transport of lead oxide vapor to the reactor walls.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 12 , December 1992 , pp. 3333 - 3341
Copyright
Copyright © Materials Research Society 1992

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References

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