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Characterization of Particles Synthesized by Aerosol Processes for Various Pb:Si Molar Feed Ratios

Published online by Cambridge University Press:  15 February 2011

Timothy M. Owens  and
Pratim Biswas
Timothy M. Owens
Affiliation:
National Research Council Postdoctoral Fellow Current Address: Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, [email protected]
Pratim Biswas
Affiliation:
Aerosol and Air Quality Research Laboratory, Department of Civil and Environmental Engineering, University of Cincinnati, Cincinnati, OH 45221-0071
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Abstract

A detailed characterization was performed of the particles produced under various Pb:Si molar feed ratios in a flow reactor at a maximum temperature of 1000 °C. The silica particles formed in the high temperature region coagulated and only partially coalesced to form large agglomerate structures of high specific surface area. For a lead only feed, the resulting particles were hydrocerussite with small but detectable amounts of massicot. As the silica precursor was inlet in excess amounts (Pb:Si ≤ 1:12), the crystalline lead compounds disappeared and amorphous lead-silica complexes predominated. The particle morphology also changed from cylindrical, polygonal and spherical shapes to large agglomerate structures composed of several size modes of primary particles. At Pb:Si molar feed ratios of 1:12 and 1:29, the particles making up the chain-like agglomerate structure were primarily spherical with larger lead silicate spherical particles (≈ 0.5 μm) attached to the agglomerate. The lead was found to be distributed throughout the large agglomerate structures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 400: Symposium E – Metastable Metal-Based Phases and Microstructures , 1995 , 101
Copyright
Copyright © Materials Research Society 1996

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