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Relating the single particle soot photometer (SP2) signal response to soot maturity

Nilsson, Lovisa LU ; Török, Sandra LU ; Ahlberg, Erik LU ; Eriksson, Axel LU orcid ; Bergqvist, Saga LU ; Le, Thi Kim Cuong LU orcid ; Bengtsson, Per-Erik LU orcid and Swietlicki, Erik LU orcid (2024) In Aerosol Science and Technology
Abstract
Light absorbing carbonaceous aerosols produced from combustion span over a range of physicochemical properties. Soot is the most recognized species in this category and its formation process involves gradual maturation from amorphous young soot with a high hydrogen-to-carbon-ratio toward mature soot aggregates. In this work, the optical response of a single particle soot photometer (SP2) to electrical mobility size selected soot of different maturity produced by a mini-CAST soot generator is investigated. The results show that for soot of a specific mobility diameter, the laser-induced incandescence (LII) signal appears earlier and with a higher LII peak height for increasing soot maturity. The experimental observations are supported by... (More)
Light absorbing carbonaceous aerosols produced from combustion span over a range of physicochemical properties. Soot is the most recognized species in this category and its formation process involves gradual maturation from amorphous young soot with a high hydrogen-to-carbon-ratio toward mature soot aggregates. In this work, the optical response of a single particle soot photometer (SP2) to electrical mobility size selected soot of different maturity produced by a mini-CAST soot generator is investigated. The results show that for soot of a specific mobility diameter, the laser-induced incandescence (LII) signal appears earlier and with a higher LII peak height for increasing soot maturity. The experimental observations are supported by simulations using a numerical model for the LII process. Furthermore, the effect of systematically varying the SP2 laser power on the detection of soot of different maturity using LII is explored. This work can be seen as a step toward the aim of using the SP2 instrument to identify soot particles of different maturity in the atmosphere. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
epub
subject
in
Aerosol Science and Technology
publisher
Taylor & Francis
external identifiers
  • scopus:85191227888
ISSN
1521-7388
DOI
10.1080/02786826.2024.2341057
language
English
LU publication?
yes
id
b3cf5deb-53ba-4d45-9046-fcc6150810f5
date added to LUP
2024-04-26 08:40:27
date last changed
2024-05-01 04:00:11
@article{b3cf5deb-53ba-4d45-9046-fcc6150810f5,
  abstract     = {{Light absorbing carbonaceous aerosols produced from combustion span over a range of physicochemical properties. Soot is the most recognized species in this category and its formation process involves gradual maturation from amorphous young soot with a high hydrogen-to-carbon-ratio toward mature soot aggregates. In this work, the optical response of a single particle soot photometer (SP2) to electrical mobility size selected soot of different maturity produced by a mini-CAST soot generator is investigated. The results show that for soot of a specific mobility diameter, the laser-induced incandescence (LII) signal appears earlier and with a higher LII peak height for increasing soot maturity. The experimental observations are supported by simulations using a numerical model for the LII process. Furthermore, the effect of systematically varying the SP2 laser power on the detection of soot of different maturity using LII is explored. This work can be seen as a step toward the aim of using the SP2 instrument to identify soot particles of different maturity in the atmosphere.}},
  author       = {{Nilsson, Lovisa and Török, Sandra and Ahlberg, Erik and Eriksson, Axel and Bergqvist, Saga and Le, Thi Kim Cuong and Bengtsson, Per-Erik and Swietlicki, Erik}},
  issn         = {{1521-7388}},
  language     = {{eng}},
  month        = {{04}},
  publisher    = {{Taylor & Francis}},
  series       = {{Aerosol Science and Technology}},
  title        = {{Relating the single particle soot photometer (SP2) signal response to soot maturity}},
  url          = {{http://dx.doi.org/10.1080/02786826.2024.2341057}},
  doi          = {{10.1080/02786826.2024.2341057}},
  year         = {{2024}},
}