Internal structure of soot particles in a diffusion flame
The evolution of the internal structure of soot particles was studied in a coflow diffusion flame. Soot particles from the flame were imaged using high resolution transmission electron microscopy. An algorithm to quantify the nano-structure of the particles was extended to study the radial distribut...
Saved in:
Main Authors: | , , , , , , |
---|---|
Other Authors: | |
Format: | Article |
Language: | English |
Published: |
2021
|
Subjects: | |
Online Access: | https://hdl.handle.net/10356/150628 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Institution: | Nanyang Technological University |
Language: | English |
id |
sg-ntu-dr.10356-150628 |
---|---|
record_format |
dspace |
spelling |
sg-ntu-dr.10356-1506282021-06-07T07:50:25Z Internal structure of soot particles in a diffusion flame Botero, Maria L. Sheng, Yuan Akroyd, Jethro Martin, Jacob Dreyer, Jochen A. H. Yang, Wenming Kraft, Markus School of Chemical and Biomedical Engineering Engineering::Chemical engineering Molecules Nanostructures The evolution of the internal structure of soot particles was studied in a coflow diffusion flame. Soot particles from the flame were imaged using high resolution transmission electron microscopy. An algorithm to quantify the nano-structure of the particles was extended to study the radial distribution of fringes within the particles. The approximate size of the molecules in the particles was calculated from the fringe lengths, assuming planar peri-condensed PAHs. The molecules are slightly larger (∼16 rings) and more stacked at the core than at the surface (∼12 rings) of the youngest particles sampled, suggesting that the particles could be formed via the stabilisation of a nuclei of larger PAHs and condensation of smaller PAHs on their surface. In the lower-temperature region of the flame the molecules grow mainly at the surface of the particles, whereas the molecules in the core of the particles become less stacked and slightly smaller, indicating some degree of nano-structural mobility. In the higher-temperature region of the flame, a graphitisation process takes place, with the development of a shell of longer (∼20 rings), flatter and more compact molecules, and an immobilised amorphous core. At the tip of the flame the particles are oxidised, mainly through surface oxidation. National Research Foundation (NRF) This project is funded by the National Research Foundation, Prime Minister's Office, Singapore under its Campus for Research Excellence and Technological Enterprise (CREATE) programme. 2021-06-07T07:50:25Z 2021-06-07T07:50:25Z 2019 Journal Article Botero, M. L., Sheng, Y., Akroyd, J., Martin, J., Dreyer, J. A. H., Yang, W. & Kraft, M. (2019). Internal structure of soot particles in a diffusion flame. Carbon, 141, 635-642. https://dx.doi.org/10.1016/j.carbon.2018.09.063 0008-6223 0000-0001-6618-3098 0000-0002-7514-4549 0000-0002-4293-8924 https://hdl.handle.net/10356/150628 10.1016/j.carbon.2018.09.063 2-s2.0-85054747367 141 635 642 en Carbon © 2018 Elsevier Ltd. All rights reserved. |
institution |
Nanyang Technological University |
building |
NTU Library |
continent |
Asia |
country |
Singapore Singapore |
content_provider |
NTU Library |
collection |
DR-NTU |
language |
English |
topic |
Engineering::Chemical engineering Molecules Nanostructures |
spellingShingle |
Engineering::Chemical engineering Molecules Nanostructures Botero, Maria L. Sheng, Yuan Akroyd, Jethro Martin, Jacob Dreyer, Jochen A. H. Yang, Wenming Kraft, Markus Internal structure of soot particles in a diffusion flame |
description |
The evolution of the internal structure of soot particles was studied in a coflow diffusion flame. Soot particles from the flame were imaged using high resolution transmission electron microscopy. An algorithm to quantify the nano-structure of the particles was extended to study the radial distribution of fringes within the particles. The approximate size of the molecules in the particles was calculated from the fringe lengths, assuming planar peri-condensed PAHs. The molecules are slightly larger (∼16 rings) and more stacked at the core than at the surface (∼12 rings) of the youngest particles sampled, suggesting that the particles could be formed via the stabilisation of a nuclei of larger PAHs and condensation of smaller PAHs on their surface. In the lower-temperature region of the flame the molecules grow mainly at the surface of the particles, whereas the molecules in the core of the particles become less stacked and slightly smaller, indicating some degree of nano-structural mobility. In the higher-temperature region of the flame, a graphitisation process takes place, with the development of a shell of longer (∼20 rings), flatter and more compact molecules, and an immobilised amorphous core. At the tip of the flame the particles are oxidised, mainly through surface oxidation. |
author2 |
School of Chemical and Biomedical Engineering |
author_facet |
School of Chemical and Biomedical Engineering Botero, Maria L. Sheng, Yuan Akroyd, Jethro Martin, Jacob Dreyer, Jochen A. H. Yang, Wenming Kraft, Markus |
format |
Article |
author |
Botero, Maria L. Sheng, Yuan Akroyd, Jethro Martin, Jacob Dreyer, Jochen A. H. Yang, Wenming Kraft, Markus |
author_sort |
Botero, Maria L. |
title |
Internal structure of soot particles in a diffusion flame |
title_short |
Internal structure of soot particles in a diffusion flame |
title_full |
Internal structure of soot particles in a diffusion flame |
title_fullStr |
Internal structure of soot particles in a diffusion flame |
title_full_unstemmed |
Internal structure of soot particles in a diffusion flame |
title_sort |
internal structure of soot particles in a diffusion flame |
publishDate |
2021 |
url |
https://hdl.handle.net/10356/150628 |
_version_ |
1702431266925707264 |