Laser-induced structural modifications of differently aged soot investigated by HRTEM

Barbara Apicella, P. Pré, J. N. Rouzaud, J. Abrahamson, Randy Lee Vander Wal, A. Ciajolo, A. Tregrossi, C. Russo

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Laser heating was applied to soot probed in the first inception region (nascent soot) and downstream (mature soot) of premixed methane and ethylene flames, burning in similar temperature and equivalence ratio conditions. Different properties of nascent and mature soot were investigated by TEM/HRTEM and EELS along with elemental analysis, UV–visible and Raman spectroscopy. Structural modifications were followed by HRTEM imaging applied to the soot before and after laser heating. Laser heating produced varied modifications of the lamellae organization dependent upon the morphology of pristine soot, in turn dependent on soot aging and fuel type (ethylene and methane). Specifically, structures in form of void shells versus multifaceted rosette structures were observed in the case of young nascent and mature soot, respectively, showing a relationship with their different nanostructures, namely amorphous versus disordered turbostratic structures. Additionally, the differentiation between void shells or multifaceted rosette structures can be used as signature for the occurrence of laser heating effects, which have to be avoided when the laser is instead employed for diagnostic purposes.

Original languageEnglish (US)
Pages (from-to)13-22
Number of pages10
JournalCombustion and Flame
Volume204
DOIs
StatePublished - Jun 1 2019

Fingerprint

Soot
soot
Laser heating
Lasers
laser heating
lasers
Methane
voids
Ethylene
ethylene
methane
temperature ratio
Electron energy loss spectroscopy
lamella
spectroscopy
equivalence
Raman spectroscopy
flames
Nanostructures
Aging of materials

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

Cite this

Apicella, Barbara ; Pré, P. ; Rouzaud, J. N. ; Abrahamson, J. ; Vander Wal, Randy Lee ; Ciajolo, A. ; Tregrossi, A. ; Russo, C. / Laser-induced structural modifications of differently aged soot investigated by HRTEM. In: Combustion and Flame. 2019 ; Vol. 204. pp. 13-22.
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Apicella, B, Pré, P, Rouzaud, JN, Abrahamson, J, Vander Wal, RL, Ciajolo, A, Tregrossi, A & Russo, C 2019, 'Laser-induced structural modifications of differently aged soot investigated by HRTEM', Combustion and Flame, vol. 204, pp. 13-22. https://doi.org/10.1016/j.combustflame.2019.02.026

Laser-induced structural modifications of differently aged soot investigated by HRTEM. / Apicella, Barbara; Pré, P.; Rouzaud, J. N.; Abrahamson, J.; Vander Wal, Randy Lee; Ciajolo, A.; Tregrossi, A.; Russo, C.

In: Combustion and Flame, Vol. 204, 01.06.2019, p. 13-22.

Research output: Contribution to journalArticle

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T1 - Laser-induced structural modifications of differently aged soot investigated by HRTEM

AU - Apicella, Barbara

AU - Pré, P.

AU - Rouzaud, J. N.

AU - Abrahamson, J.

AU - Vander Wal, Randy Lee

AU - Ciajolo, A.

AU - Tregrossi, A.

AU - Russo, C.

PY - 2019/6/1

Y1 - 2019/6/1

N2 - Laser heating was applied to soot probed in the first inception region (nascent soot) and downstream (mature soot) of premixed methane and ethylene flames, burning in similar temperature and equivalence ratio conditions. Different properties of nascent and mature soot were investigated by TEM/HRTEM and EELS along with elemental analysis, UV–visible and Raman spectroscopy. Structural modifications were followed by HRTEM imaging applied to the soot before and after laser heating. Laser heating produced varied modifications of the lamellae organization dependent upon the morphology of pristine soot, in turn dependent on soot aging and fuel type (ethylene and methane). Specifically, structures in form of void shells versus multifaceted rosette structures were observed in the case of young nascent and mature soot, respectively, showing a relationship with their different nanostructures, namely amorphous versus disordered turbostratic structures. Additionally, the differentiation between void shells or multifaceted rosette structures can be used as signature for the occurrence of laser heating effects, which have to be avoided when the laser is instead employed for diagnostic purposes.

AB - Laser heating was applied to soot probed in the first inception region (nascent soot) and downstream (mature soot) of premixed methane and ethylene flames, burning in similar temperature and equivalence ratio conditions. Different properties of nascent and mature soot were investigated by TEM/HRTEM and EELS along with elemental analysis, UV–visible and Raman spectroscopy. Structural modifications were followed by HRTEM imaging applied to the soot before and after laser heating. Laser heating produced varied modifications of the lamellae organization dependent upon the morphology of pristine soot, in turn dependent on soot aging and fuel type (ethylene and methane). Specifically, structures in form of void shells versus multifaceted rosette structures were observed in the case of young nascent and mature soot, respectively, showing a relationship with their different nanostructures, namely amorphous versus disordered turbostratic structures. Additionally, the differentiation between void shells or multifaceted rosette structures can be used as signature for the occurrence of laser heating effects, which have to be avoided when the laser is instead employed for diagnostic purposes.

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