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Open AccessArticle

Modelling the Optical Properties of Soot Particles under Various Aging Conditions

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State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
2
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
3
CSIRO Energy, P.O. Box 52, North Ryde NSW 1670, Australia
4
Hangzhou Environmental Monitoring Center Station, Hangzhou 310007, China
*
Authors to whom correspondence should be addressed.
Atmosphere 2020, 11(1), 86; https://doi.org/10.3390/atmos11010086
Received: 2 December 2019 / Revised: 26 December 2019 / Accepted: 7 January 2020 / Published: 10 January 2020
(This article belongs to the Special Issue Future Energy Technologies and Photochemical Smog Formation)
As atmospheric fresh soot particles age, they become coated with other chemical species. This transforms their physicochemical properties and affects their optical characteristics, which is of great importance to air quality, the environment and climate change. One of the predominantly occurring states of soot particles in the ambient environment is the core-shell mixing state. In this study, we used the core-shell model to calculate the optical absorption, scattering and extinction efficiency, absorption proportion and absorption exponent of coated soot particles. We then investigated the effects of different core sizes (D0), incident wavelengths (λ), coating materials and coating thicknesses on these optical characteristics. Absorption efficiency and absorption proportion of soot particles decreased as the coating became thicker, at core sizes of D0 = 20, 50 and 100 nm and λ = 405, 532 and 781 nm, regardless of the type of coating material. As the coating thickness increased, the absorption exponent (β) of inorganic-coated soot particles tended to rise and then fall, while the β value of organic-coated soot particles kept increasing. Our results advance our scientific understanding of the interaction of optical properties with chemical composition, mixing state, and aging processes of soot particles in the atmosphere. View Full-Text
Keywords: core-shell model; optical property; soot particle; absorption efficiency; absorption exponent; coating composition core-shell model; optical property; soot particle; absorption efficiency; absorption exponent; coating composition
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Li, K.; Yan, M.; Shen, J.; Zhang, X.; Geng, C.; Yang, W.; Azzi, M. Modelling the Optical Properties of Soot Particles under Various Aging Conditions. Atmosphere 2020, 11, 86.

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