Soot differentiation by laser derivatization

Madhu Singh, Chethan K. Gaddam, Joseph P. Abrahamson, Randy Lee Vander Wal

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Combustion produced soot is highly variable in its composition and nanostructure, both of which are dependent upon combustion conditions. Quantification of high-resolution transmission electron microscopy (HRTEM) images for nanostructure parameters shows that soot nanostructure is dependent upon its source. In principle, this permits identification of the soot and its contribution to any pollution monitoring receptor site. Many structural and chemical aspects are subtle, unaccounted for in direct nanostructure quantification. The process of pulsed laser annealing is demonstrated to enhance slight differences in nanostructure and chemical composition. Chemistry-based limitations imposed due to nanosecond heating and microsecond cooling timescales highlight these initial compositional and structural differences—as dependent upon source-specific formation conditions. This study demonstrates laser-based heating as an analytical tool for soot differentiation by formation conditions/source by identifying operational parameters for optimal derivatization. Nanostructure changes are qualitatively shown using HRTEM and quantified using image-based fringe analysis for real and model soots.

Original languageEnglish (US)
Pages (from-to)207-229
Number of pages23
JournalAerosol Science and Technology
Volume53
Issue number2
DOIs
StatePublished - Feb 1 2019

Fingerprint

Soot
soot
Nanostructures
laser
Lasers
transmission electron microscopy
High resolution transmission electron microscopy
combustion
heating
pollution monitoring
Heating
annealing
Chemical analysis
Pulsed lasers
chemical composition
Pollution
cooling
timescale
Annealing
Cooling

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Materials Science(all)
  • Pollution

Cite this

Singh, Madhu ; Gaddam, Chethan K. ; Abrahamson, Joseph P. ; Vander Wal, Randy Lee. / Soot differentiation by laser derivatization. In: Aerosol Science and Technology. 2019 ; Vol. 53, No. 2. pp. 207-229.
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Soot differentiation by laser derivatization. / Singh, Madhu; Gaddam, Chethan K.; Abrahamson, Joseph P.; Vander Wal, Randy Lee.

In: Aerosol Science and Technology, Vol. 53, No. 2, 01.02.2019, p. 207-229.

Research output: Contribution to journalArticle

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