Aerosol analysis of residual and nanoparticle fractions from spray pyrolysis of poorly volatile precursors |
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| Authors: | Juha Harra Sonja Kujanpää Janne Haapanen Paxton Juuti Jyrki M Mäkelä Leo Hyvärinen Mari Honkanen |
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| Affiliation: | 1. Dept. of Physics, Tampere University of Technology, P.O. Box 692, 33101 Tampere, Finland;2. Dept. of Materials Science, Tampere University of Technology, P.O. Box 589, 33101 Tampere, Finland |
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| Abstract: | The quality of aerosol‐produced nanopowders can be impaired by micron‐sized particles formed due to non‐uniform process conditions. Methods to evaluate the quality reliably and fast, preferably on‐line, are important at industrial scales. Here, aerosol analysis methods are used to determine the fractions of nanoparticles and micron‐sized residuals from poorly volatile precursors. This is accomplished using aerosol instruments to measure the number and mass size distributions of Liquid Flame Spray‐generated alumina and silver particles produced from metal nitrates dissolved in ethanol and 2‐ethylhexanoic acid (EHA). The addition of EHA had no effect on silver, whereas, 5% EHA concentration was enough to shift the alumina mass from the residuals to nanoparticles. The size‐resolved aerosol analysis proved to be an effective method for determining the product quality. Moreover, the used on‐line techniques alone can be used to evaluate the process output when producing nanopowders, reducing the need for tedious off‐line analyses. © 2016 American Institute of Chemical Engineers AIChE J, 63: 881–892, 2017 |
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| Keywords: | aerosol flame synthesis particle‐size distribution gas‐to‐particle droplet‐to‐particle effective density |
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