An unexpected restructuring of combustion soot aggregates by subnanometer coatings of polycyclic aromatic hydrocarbons

Chao Chen, Xiaolong Fan, Tasneem Shaltout, Chong Qiu, Yan Ma, Andrew Goldman, Alexei Khalizov

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We investigated the effect of thin polycyclic aromatic hydrocarbon (PAH) coatings on the structure of soot aggregates. Soot aerosol from an inverted diffusion burner was size classified, thermally denuded, coated with six different PAHs, and then characterized using scanning electron microscopy, light scattering, and mass-mobility measurements. Contrary to our expectation, significant restructuring was observed in the presence of subnanometer layers of pyrene, fluoranthene, and phenanthrene. These PAHs remained in subcooled liquid state in thin films, whereby the liquid layer acted as a lubricant, reducing the force required to initiate the restructuring. Thin layers of PAH of higher melting temperatures (perylene, anthracene, and triphenylene) presumably remained solid because these chemicals induced lesser structural changes. Our results suggest that some of the intrinsic PAH generated during incomplete combustion may induce significant restructuring of soot aggregates, even when present in small quantities, altering the properties and atmospheric impacts of combustion aerosols.

Original languageEnglish (US)
Pages (from-to)11,080-11,088
JournalGeophysical Research Letters
Volume43
Issue number20
DOIs
StatePublished - Oct 28 2016

Fingerprint

soot
polycyclic aromatic hydrocarbons
coating
PAH
combustion
coatings
aerosols
aerosol
phenanthrene
fluoranthene
lubricant
burners
light scattering
pyrenes
lubricants
liquids
anthracene
pyrene
structural change
melting

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Keywords

  • PAH
  • aerosol
  • aggregates
  • morphology
  • soot

Cite this

Chen, Chao ; Fan, Xiaolong ; Shaltout, Tasneem ; Qiu, Chong ; Ma, Yan ; Goldman, Andrew ; Khalizov, Alexei. / An unexpected restructuring of combustion soot aggregates by subnanometer coatings of polycyclic aromatic hydrocarbons. In: Geophysical Research Letters. 2016 ; Vol. 43, No. 20. pp. 11,080-11,088.
@article{771f05eef58a4a5f8d881a169abf49af,
title = "An unexpected restructuring of combustion soot aggregates by subnanometer coatings of polycyclic aromatic hydrocarbons",
abstract = "We investigated the effect of thin polycyclic aromatic hydrocarbon (PAH) coatings on the structure of soot aggregates. Soot aerosol from an inverted diffusion burner was size classified, thermally denuded, coated with six different PAHs, and then characterized using scanning electron microscopy, light scattering, and mass-mobility measurements. Contrary to our expectation, significant restructuring was observed in the presence of subnanometer layers of pyrene, fluoranthene, and phenanthrene. These PAHs remained in subcooled liquid state in thin films, whereby the liquid layer acted as a lubricant, reducing the force required to initiate the restructuring. Thin layers of PAH of higher melting temperatures (perylene, anthracene, and triphenylene) presumably remained solid because these chemicals induced lesser structural changes. Our results suggest that some of the intrinsic PAH generated during incomplete combustion may induce significant restructuring of soot aggregates, even when present in small quantities, altering the properties and atmospheric impacts of combustion aerosols.",
keywords = "PAH, aerosol, aggregates, morphology, soot",
author = "Chao Chen and Xiaolong Fan and Tasneem Shaltout and Chong Qiu and Yan Ma and Andrew Goldman and Alexei Khalizov",
year = "2016",
month = "10",
day = "28",
doi = "https://doi.org/10.1002/2016GL070877",
language = "English (US)",
volume = "43",
pages = "11,080--11,088",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "Wiley-Blackwell",
number = "20",

}

An unexpected restructuring of combustion soot aggregates by subnanometer coatings of polycyclic aromatic hydrocarbons. / Chen, Chao; Fan, Xiaolong; Shaltout, Tasneem; Qiu, Chong; Ma, Yan; Goldman, Andrew; Khalizov, Alexei.

In: Geophysical Research Letters, Vol. 43, No. 20, 28.10.2016, p. 11,080-11,088.

Research output: Contribution to journalArticle

TY - JOUR

T1 - An unexpected restructuring of combustion soot aggregates by subnanometer coatings of polycyclic aromatic hydrocarbons

AU - Chen, Chao

AU - Fan, Xiaolong

AU - Shaltout, Tasneem

AU - Qiu, Chong

AU - Ma, Yan

AU - Goldman, Andrew

AU - Khalizov, Alexei

PY - 2016/10/28

Y1 - 2016/10/28

N2 - We investigated the effect of thin polycyclic aromatic hydrocarbon (PAH) coatings on the structure of soot aggregates. Soot aerosol from an inverted diffusion burner was size classified, thermally denuded, coated with six different PAHs, and then characterized using scanning electron microscopy, light scattering, and mass-mobility measurements. Contrary to our expectation, significant restructuring was observed in the presence of subnanometer layers of pyrene, fluoranthene, and phenanthrene. These PAHs remained in subcooled liquid state in thin films, whereby the liquid layer acted as a lubricant, reducing the force required to initiate the restructuring. Thin layers of PAH of higher melting temperatures (perylene, anthracene, and triphenylene) presumably remained solid because these chemicals induced lesser structural changes. Our results suggest that some of the intrinsic PAH generated during incomplete combustion may induce significant restructuring of soot aggregates, even when present in small quantities, altering the properties and atmospheric impacts of combustion aerosols.

AB - We investigated the effect of thin polycyclic aromatic hydrocarbon (PAH) coatings on the structure of soot aggregates. Soot aerosol from an inverted diffusion burner was size classified, thermally denuded, coated with six different PAHs, and then characterized using scanning electron microscopy, light scattering, and mass-mobility measurements. Contrary to our expectation, significant restructuring was observed in the presence of subnanometer layers of pyrene, fluoranthene, and phenanthrene. These PAHs remained in subcooled liquid state in thin films, whereby the liquid layer acted as a lubricant, reducing the force required to initiate the restructuring. Thin layers of PAH of higher melting temperatures (perylene, anthracene, and triphenylene) presumably remained solid because these chemicals induced lesser structural changes. Our results suggest that some of the intrinsic PAH generated during incomplete combustion may induce significant restructuring of soot aggregates, even when present in small quantities, altering the properties and atmospheric impacts of combustion aerosols.

KW - PAH

KW - aerosol

KW - aggregates

KW - morphology

KW - soot

UR - http://www.scopus.com/inward/record.url?scp=84995544878&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84995544878&partnerID=8YFLogxK

U2 - https://doi.org/10.1002/2016GL070877

DO - https://doi.org/10.1002/2016GL070877

M3 - Article

VL - 43

SP - 11,080-11,088

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 20

ER -