Examination of the thermal accommodation coefficient used in the sizing of iron nanoparticles by time-resolved laser-induced incandescence
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While time-resolved laser-induced incandescence (TiRe-LII) shows promise as a diagnostic for sizing aerosolized iron nanoparticles, the spectroscopic and heat transfer models needed to interpret TiRe-LII measurements on iron nanoparticles remain uncertain. This paper focuses on three key aspects of the models: the thermal accommodation coefficient; the spectral absorption efficiency; and the evaporation sub-model. Based on a detailed literature review, spectroscopic and heat transfer models are defined and applied to analyze TiRe-LII measurements carried out on iron nanoparticles formed in water and then aerosolized into monatomic and polyatomic carrier gases. A comparative analysis of the results shows nanoparticle sizes that are consistent between carrier gases and thermal accommodation coefficients that follow the expected trends with bath gas molecular mass and structure.
KeywordsNanoparticle Size Iron Nanoparticles Heat Transfer Model Molten Iron Nanoparticle Diameter
This research was supported by the National Science and Engineering Research Council of Canada (NSERC), the Canadian Foundation for Innovation-Leaders Opportunity Fund (CFI-LOF), and the Waterloo Institute for Nanotechnology (WIN). Transmission electron microscopy was carried out using the facilities of the Canadian Centre for Electron Microscopy.
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