Aerosol analysis of residual and nanoparticle fractions from spray pyrolysis of poorly volatile precursors

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• 作者：Juha Harra ; Sonja Kujanpä ; ä ; Janne Haapanen ; Paxton Juuti ; Jyrki M. Mä ; kelä ; Leo Hyvä ; rinen and Mari Honkanen
• 刊名：AIChE Journal
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：63
• 期：3
• 页码：881-892
• 全文大小：919K
• ISSN：1547-5905

文摘

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.