Morphology of Oxide Particles Made by the Emulsion Combustion Method
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Date
2003-06
Publication Type
Journal Article
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Abstract
Various oxide powders were prepared by the emulsion combustion method (ECM) using metal precursors, kerosene, and a surfactant. The product particles were characterized by transmission electron microscopy (TEM), nitrogen adsorption, and X‐ray diffraction. Hollow γ‐Al₂O₃ particles were produced from aluminum nitrate or chloride precursors dispersed in air, whereas dispersion of the precursor emulsion in oxygen resulted in solid α‐Al₂O₃ particles. Hollow spheres were obtained also for TiO₂, ZrO₂, and Y₂O₃ by ECM of TiCl₄, zirconium oxynitrate, and yttrium nitrate in aqueous solution. A simple method was developed to predict the thickness and diameter of hollow particles using the nitrogen adsorption data and initial droplet concentration of the ECM spray. The TEM diameter and shell thickness of hollow particles were consistent with those predicted. In contrast, solid particles were formed by ECM for ZnO, Fe₂O₃, CeO₂, and MgO from aqueous solutions of their corresponding nitrates.
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published
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Journal / series
Volume
86 (6)
Pages / Article No.
898 - 904
Publisher
American Ceramic Society
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Methods
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03510 - Pratsinis, Sotiris E. (emeritus) / Pratsinis, Sotiris E. (emeritus)
Notes
Article first published online 20 December 2004, Received 24 October 2002, Approved 4 February 2003.