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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-86
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-86
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 24 Apr 2019

Research article | 24 Apr 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Morphology and Raman spectra of aerodynamically-classified soot samples

Alberto Baldelli and Steven Nicholas Rogak Alberto Baldelli and Steven Nicholas Rogak
  • Department of Mechanical Engineering, University of British Columbia, 6250 Applied Science Ln #2054, Vancouver, BC V6T 1Z4

Abstract. Airborne soot is emitted from combustion processes as aggregates of primary particles. The size of the primary particles and the overall aggregate size control soot transport properties, and prior research shows that these parameters may be related to the soot nanostructure. In this work, a laminar, inverted non-premixed burner has been used as a source of soot that is almost completely elemental carbon. The inverted burner was connected to an Electrostatic Low-Pressure Impactor, which collected particles on stages according to the aerodynamic diameter, from 0.3 to 10 μm. The morphology was analyzed using a Transmission Electron Microscope followed by image processing to extract projected area and average primary particle size for each aggregate (approximately 1000 aggregates analyzed in total for the 9 impactor stages). Carbon nanostructure was analyzed using a Raman spectrometer, and 5 absorption bands (D4, D1, D3, G, and D2) were fitted to the spectra to obtain an estimate of the carbon disorder. The average primary particle diameter increases from 15 to 30 nm as the impactor stage aerodynamic diameter increases. The D1, D3, D2, and D4 bands decreased (relative to the G band) with the particle size, suggesting that the larger aggregates have larger graphitic domains.

Alberto Baldelli and Steven Nicholas Rogak
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Status: open (until 19 Jun 2019)
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Alberto Baldelli and Steven Nicholas Rogak
Alberto Baldelli and Steven Nicholas Rogak
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Latest update: 26 May 2019
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Short summary
Raman spectra and soot primary particle size change with the impactor sampling stage even though the soot source is a steady laboratory flame. This is of potential interest to atmospheric researchers because past work on aerodynamically separated samples was interpreted in terms of distinct particle sources producing particles of different sizes and chemical structures.
Raman spectra and soot primary particle size change with the impactor sampling stage even though...
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