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Atmosphere 2017, 8(9), 166; doi:10.3390/atmos8090166

Effect of Thermodenuding on the Structure of Nascent Flame Soot Aggregates

1
Department of Physics and Atmospheric Sciences Program, Michigan Technological University, Houghton, MI 49931, USA
2
Aerodyne Research Inc., Billerica, MA 01821, USA
3
Chemistry Department, Boston College, Chestnut Hill, MA 02467, USA
4
Centre for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA 15232, USA
5
Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 2G8, Canada
6
Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Current address: Pacific Northwest National Laboratory, Richland, WA 99354, USA.
*
Authors to whom correspondence should be addressed.
Received: 27 July 2017 / Revised: 29 August 2017 / Accepted: 31 August 2017 / Published: 6 September 2017
(This article belongs to the Special Issue Morphology and Internal Mixing of Atmospheric Particles)
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Abstract

The optical properties (absorption and scattering) of soot particles depend on soot size and index of refraction, but also on the soot complex morphology and the internal mixing with materials that can condense on a freshly emitted (nascent) soot particle and coat it. This coating can affect the soot optical properties by refracting light, or by changing the soot aggregate structure. A common approach to studying the effect of coating on soot optical properties is to measure the absorption and scattering coefficients in ambient air, and then measure them again after removing the coating using a thermodenuder. In this approach, it is assumed that: (1) most of the coating material is removed; (2) charred organic coating does not add to the refractory carbon; (3) oxidation of soot is negligible; and, (4) the structure of the pre-existing soot core is left unaltered, despite the potential oxidation of the core at elevated temperatures. In this study, we investigated the validity of the last assumption, by studying the effect of thermodenuding on the morphology of nascent soot. To this end, we analyzed the morphological properties of laboratory generated nascent soot, before and after thermodenuding. Our investigation shows that there is only minor restructuring of nascent soot by thermodenuding. View Full-Text
Keywords: thermodenuding; soot morphology; aggregates; compaction; restructuring thermodenuding; soot morphology; aggregates; compaction; restructuring
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Bhandari, J.; China, S.; Onasch, T.; Wolff, L.; Lambe, A.; Davidovits, P.; Cross, E.; Ahern, A.; Olfert, J.; Dubey, M.; Mazzoleni, C. Effect of Thermodenuding on the Structure of Nascent Flame Soot Aggregates. Atmosphere 2017, 8, 166.

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