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Internal structure of soot particles in a diffusion flame

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cam.issuedOnline2018-10-01
dc.contributor.authorBotero, ML
dc.contributor.authorSheng, Y
dc.contributor.authorAkroyd, J
dc.contributor.authorMartin, J
dc.contributor.authorDreyer, JAH
dc.contributor.authorYang, W
dc.contributor.authorKraft, M
dc.contributor.orcidBotero, ML [0000-0001-6618-3098]
dc.contributor.orcidMartin, J [0000-0002-7514-4549]
dc.contributor.orcidKraft, M [0000-0002-4293-8924]
dc.date.accessioned2018-11-23T00:33:03Z
dc.date.available2018-11-23T00:33:03Z
dc.date.issued2019
dc.description.abstractThe 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 pericondensed 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.
dc.identifier.doi10.17863/CAM.33187
dc.identifier.eissn1873-3891
dc.identifier.issn0008-6223
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/285843
dc.language.isoeng
dc.publisherElsevier BV
dc.publisher.urlhttp://dx.doi.org/10.1016/j.carbon.2018.09.063
dc.subject40 Engineering
dc.subject4017 Mechanical Engineering
dc.subject4002 Automotive Engineering
dc.titleInternal structure of soot particles in a diffusion flame
dc.typeArticle
dcterms.dateAccepted2018-09-22
prism.endingPage642
prism.publicationDate2019
prism.publicationNameCarbon
prism.startingPage635
prism.volume141
pubs.funder-project-idNational Research Foundation Singapore (via Cambridge Centre for Advanced Research and Education in Singapore (CARES)) (unknown)
rioxxterms.licenseref.startdate2019-01-01
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.typeJournal Article/Review
rioxxterms.versionAM
rioxxterms.versionofrecord10.1016/j.carbon.2018.09.063

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