Impact of Organic Coating on Soot Angular and Spectral Scattering Properties

In the last two to three decades, many efforts have been made to evaluate the radiative properties of soot in flames. Due to the strong impact of soot on global warming and the aging process of soot particles in the atmosphere, it is necessary to gain a better understanding on how the radiative prop...

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Bibliographic Details
Published inEnvironmental science & technology Vol. 53; no. 11; pp. 6383 - 6391
Main Authors Lefevre, Guillaume, Yon, Jérôme, Bouvier, Maxime, Liu, Fengshan, Coppalle, Alexis
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 04.06.2019
Subjects
Aging
Atmospheric models
Climate change
Climate models
Coatings
Engineering Sciences
Environment and Society
Environmental Sciences
Fractal geometry
Fractals
Global warming
Light scattering
Oleic acid
Optics
Organic coatings
Photonic
Properties (attributes)
Reactive fluid environment
Soot
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Summary:In the last two to three decades, many efforts have been made to evaluate the radiative properties of soot in flames. Due to the strong impact of soot on global warming and the aging process of soot particles in the atmosphere, it is necessary to gain a better understanding on how the radiative properties of soot are affected by coating with nonabsorbing organic aerosol compounds. In the present study, the aging process is experimentally mimicked in the laboratory by coating oleic acid onto freshly generated soot particles. The morphological restructuring of soot particles is determined by nonoptical techniques for mobility diameter and effective density and by angular light scattering for gyration radius and fractal dimension. Both approaches give results in good agreement. Moreover, spectrally resolved scattering measurements between 500 and 700 nm have been carried out. The experimental data are in satisfactory agreement with previously published numerical results and enable the validation of a Rayleigh–Debye–Gans theory for coated fractal aggregates (RDG–CFA) that could be integrated in climate models or for the interpretation of scattering based measurements.
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.8b05482