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Phase segregation in binary SiO2/TiO2 and SiO2/Fe2O3 nanoparticle aerosols formed in a premixed flame

Published online by Cambridge University Press:  31 January 2011

Sheryl H. Ehrman ,
Sheldon K. Friedlander  and
Michael R. Zachariah
Sheryl H. Ehrman*
Affiliation:
Air Quality and Aerosol Technology Laboratory, Department of Chemical Engineering, 5531 Boelter Hall, University of California, Los Angeles, California 90095
Sheldon K. Friedlander
Affiliation:
Air Quality and Aerosol Technology Laboratory, Department of Chemical Engineering, 5531 Boelter Hall, University of California, Los Angeles, California 90095
Michael R. Zachariah
Affiliation:
Chemical and Science Technology Laboratory, Building 221, Room B312, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
*
a)Address all correspondence to this author. e-mail: sehrman@eng.umd.edu
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Abstract

Binary SiO2/TiO2 and SiO2/Fe2O3 nanoparticle (diameter < 100 nm) aerosols of varying mole ratios of Ti or Fe to Si were generated in a premixed Bunsen-type aerosol flame reactor. The distribution of species within the particles was investigated using transmission electron microscopy, electron energy loss spectrometry, x-ray diffraction, and Fourier transform infrared spectroscopy. Phase segregation was observed to varying degrees in qualitative agreement with segregation expected from binary phase diagrams for the bulk systems. Differences between the SiO2/TiO2 and SiO2/Fe2O3 systems can be explained by considering the variation in the thermodynamically stable liquid-phase solubility and differences in the ability of iron and titanium ions to substitute for silicon ions in the network structure.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 12 , December 1999 , pp. 4551 - 4561
Copyright
Copyright © Materials Research Society 1999

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