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Soot Optical Band Gap Evaluated Through In-Situ And Ex-Situ Measurements As Tracer Of Soot Evolution In Premixed Flames : Soot Optical Band Gap Evaluated Through In-Situ And Ex-Situ Measurements As Tracer Of Soot Evolution In Premixed Flames

Le, Kim Cuong LU orcid ; Russo, Carmela ; Török, Sandra LU ; Apicella, Barbara ; Tregrossi, Antonio ; Bengtsson, Per-Erik LU orcid and Ciajolo, Anna (2019)
Abstract
The optical band gap has been used considerably in evaluating carbon network structures in terms of sp 2 /sp 3 sites and size of aromatic clusters. However, optical band gap determination of soot particles from optical measurements is complex due to the effects of other species including organic compounds, and the contribution of absorption from organics to the total soot absorption in the UV/visible range is often overlooked. In the present work we propose a new method for separating the optical band gap of organic compounds (E1) from that of soot (E2). We apply the method to both extinction (in situ) and absorption (ex situ) measurements at various heights in premixed laminar flat flames, and find good agreement between the methods. The... (More)
The optical band gap has been used considerably in evaluating carbon network structures in terms of sp 2 /sp 3 sites and size of aromatic clusters. However, optical band gap determination of soot particles from optical measurements is complex due to the effects of other species including organic compounds, and the contribution of absorption from organics to the total soot absorption in the UV/visible range is often overlooked. In the present work we propose a new method for separating the optical band gap of organic compounds (E1) from that of soot (E2). We apply the method to both extinction (in situ) and absorption (ex situ) measurements at various heights in premixed laminar flat flames, and find good agreement between the methods. The band gap of soot (E1) decreases as soot ages and reaches very low values typical of large size graphitic islands, while the band gap of organics (E2) is relatively constant indicating that the organic carbon compositions in unchanged. The possibility to evaluate chemical and structural properties of the soot from the band gap information is discussed. (Less)
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organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
Carbon Conference 2019
language
English
LU publication?
yes
id
8f0e4d78-71e3-4c10-90da-470c4eff39a6
alternative location
http://carbon2019.org/wp-content/uploads/2019/07/61-le.pdf
date added to LUP
2019-08-14 10:39:00
date last changed
2019-08-19 12:31:33
@inproceedings{8f0e4d78-71e3-4c10-90da-470c4eff39a6,
  abstract     = {{The optical band gap has been used considerably in evaluating carbon network structures in terms of sp 2 /sp 3 sites and size of aromatic clusters. However, optical band gap determination of soot particles from optical measurements is complex due to the effects of other species including organic compounds, and the contribution of absorption from organics to the total soot absorption in the UV/visible range is often overlooked. In the present work we propose a new method for separating the optical band gap of organic compounds (E1) from that of soot (E2). We apply the method to both extinction (in situ) and absorption (ex situ) measurements at various heights in premixed laminar flat flames, and find good agreement between the methods. The band gap of soot (E1) decreases as soot ages and reaches very low values typical of large size graphitic islands, while the band gap of organics (E2) is relatively constant indicating that the organic carbon compositions in unchanged. The possibility to evaluate chemical and structural properties of the soot from the band gap information is discussed.}},
  author       = {{Le, Kim Cuong and Russo, Carmela and Török, Sandra and Apicella, Barbara and Tregrossi, Antonio and Bengtsson, Per-Erik and Ciajolo, Anna}},
  booktitle    = {{Carbon Conference 2019}},
  language     = {{eng}},
  title        = {{Soot Optical Band Gap Evaluated Through In-Situ And Ex-Situ Measurements As Tracer Of Soot Evolution In Premixed Flames : Soot Optical Band Gap Evaluated Through In-Situ And Ex-Situ Measurements As Tracer Of Soot Evolution In Premixed Flames}},
  url          = {{http://carbon2019.org/wp-content/uploads/2019/07/61-le.pdf}},
  year         = {{2019}},
}