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Raman spectroscopy of mini-CAST soot with various fractions of organic compounds: Structural characterization during heating treatment from 25 °C to 1000 °C

Le, Kim Cuong LU orcid ; Pino, Thomas ; Pham, Van-Thai LU ; Henriksson, Jonatan ; Török, Sandra LU and Bengtsson, Per-Erik LU orcid (2019) In Combustion and Flame 209. p.291-302
Abstract
Soot particles undergo considerable changes in composition, morphology, as well as in internal structure during formation from the incipient particles to more mature aggregates, and still there is a lack of understanding of these mechanisms. In this study, soot produced by a mini-CAST soot generator was probed using Raman spectroscopy with focus on soot with large variation in size and fraction of organic compounds. The volatility of organic compounds and changes in internal bonding structures of the soot was surveyed by heating the samples from room temperature up to 1000 °C in a flow of inert N2 gas. The soot rich in organics showed more complex Raman spectra and stronger photoluminescence background. In particular, Raman signatures... (More)
Soot particles undergo considerable changes in composition, morphology, as well as in internal structure during formation from the incipient particles to more mature aggregates, and still there is a lack of understanding of these mechanisms. In this study, soot produced by a mini-CAST soot generator was probed using Raman spectroscopy with focus on soot with large variation in size and fraction of organic compounds. The volatility of organic compounds and changes in internal bonding structures of the soot was surveyed by heating the samples from room temperature up to 1000 °C in a flow of inert N2 gas. The soot rich in organics showed more complex Raman spectra and stronger photoluminescence background. In particular, Raman signatures interpreted as the CH “out-of-plane” mode, ethers COC, and carbonyl CO groups were observed. During the heating treatment, these signatures disappeared, which was related to vaporization of the organics. Moreover, an enhancement of Raman band intensity of mature soot during heating treatment was observed for the first time. Our study thus brings new information on structural and compositional changes for soot during heating treatment in an inert atmosphere. (Less)
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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Raman spectroscopy, Soot, Organic compounds, Thermal treatment
in
Combustion and Flame
volume
209
pages
11 pages
publisher
Elsevier
external identifiers
  • scopus:85070523879
ISSN
0010-2180
DOI
10.1016/j.combustflame.2019.07.037
language
English
LU publication?
yes
id
d72209c0-bba4-47c0-8db3-11b11fb81bf9
date added to LUP
2019-08-14 10:20:29
date last changed
2025-04-04 14:51:18
@article{d72209c0-bba4-47c0-8db3-11b11fb81bf9,
  abstract     = {{Soot particles undergo considerable changes in composition, morphology, as well as in internal structure during formation from the incipient particles to more mature aggregates, and still there is a lack of understanding of these mechanisms. In this study, soot produced by a mini-CAST soot generator was probed using Raman spectroscopy with focus on soot with large variation in size and fraction of organic compounds. The volatility of organic compounds and changes in internal bonding structures of the soot was surveyed by heating the samples from room temperature up to 1000 °C in a flow of inert N2 gas. The soot rich in organics showed more complex Raman spectra and stronger photoluminescence background. In particular, Raman signatures interpreted as the CH “out-of-plane” mode, ethers COC, and carbonyl CO groups were observed. During the heating treatment, these signatures disappeared, which was related to vaporization of the organics. Moreover, an enhancement of Raman band intensity of mature soot during heating treatment was observed for the first time. Our study thus brings new information on structural and compositional changes for soot during heating treatment in an inert atmosphere.}},
  author       = {{Le, Kim Cuong and Pino, Thomas and Pham, Van-Thai and Henriksson, Jonatan and Török, Sandra and Bengtsson, Per-Erik}},
  issn         = {{0010-2180}},
  keywords     = {{Raman spectroscopy; Soot; Organic compounds; Thermal treatment}},
  language     = {{eng}},
  pages        = {{291--302}},
  publisher    = {{Elsevier}},
  series       = {{Combustion and Flame}},
  title        = {{Raman spectroscopy of mini-CAST soot with various fractions of organic compounds: Structural characterization during heating treatment from 25 °C to 1000 °C}},
  url          = {{https://lup.lub.lu.se/search/files/100052019/Manuscript.pdf}},
  doi          = {{10.1016/j.combustflame.2019.07.037}},
  volume       = {{209}},
  year         = {{2019}},
}