Abstract
ABSTRACT In a study of the effect of process conditions and material properties on aerosol characteristics, nanosized metal oxide particles were produced by injecting precursors as a free jet into a methane-air flame. Primary particle size increased with volume loading, solid state diffusion coefficient, and maximum temperature. Larger particles were also obtained by decreasing the jet velocity. The number of particles per agglomerate increased with volume loading and decreased with solid state diffusion coefficient and maximum temperature. Metal oxides with diffusion coefficients ranging over several orders of magnitude produced different sized particles under the same process conditions (temperature profile and aerosol volume loading). Niobium oxide (largest diffusion coefficient) formed the largest particles with geometric volume mean diameters between 5.7 and 33.7 nm. Titania (mid-range diffusion coefficient) and alumina (lowest diffusion coefficient) formed particles with geometric volume mean diamet...
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