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

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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.

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Authors and Affiliations

  1. Air Quality and Aerosol Technology Laboratory, Department of Chemical Engineering, University of California, 5531 Boelter Hall, Los Angeles, California, 90095, USA

    Sheryl H. Ehrman & Sheldon K. Friedlander

  2. Chemical and Science Technology Laboratory, National Institute of Standards and Technology, Building 221, Room B312, Gaithersburg, Maryland, 20899, USA

    Michael R. Zachariah

Authors
  1. Sheryl H. Ehrman
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  2. Sheldon K. Friedlander
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  3. Michael R. Zachariah
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Correspondence to Sheryl H. Ehrman.

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Ehrman, S.H., Friedlander, S.K. & Zachariah, M.R. Phase segregation in binary SiO2/TiO2 and SiO2/Fe2O3 nanoparticle aerosols formed in a premixed flame. Journal of Materials Research 14, 4551–4561 (1999). https://doi.org/10.1557/JMR.1999.0617

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  • DOI: https://doi.org/10.1557/JMR.1999.0617

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