On existence of nanoparticles below the sooting threshold |
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| Authors: | M Thierley M Aigner A Abid H Wang |
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| Institution: | a DLR Institute of Combustion Technology, Pfaffenwaldring 38, 70569 Stuttgart, Germany
b Department of Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, CA 90089, USA |
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| Abstract: | Nanometer-sized particles were studied by photoionisation mass spectrometry and scanning mobility particle sizer in laminar premixed ethylene flames above and below the critical sooting threshold. For sooting flames, both techniques detected a large number of particles with masses between 1 and 50 ku or diameter around a few nanometers. Neither method detected an appreciable number of particles below the sooting threshold in flames similar to those studied earlier for UV absorption and scattering of transparent soot. The absence of particle signals in both experimental techniques raises the question about the origin of UV absorption under nonsooting conditions. |
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| Keywords: | Soot Nanoparticles Sooting limit |
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