Further details on particle inception and growth in premixed flames (Articolo in rivista)

Type
Label
  • Further details on particle inception and growth in premixed flames (Articolo in rivista) (literal)
Anno
  • 2015-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.proci.2014.06.004 (literal)
Alternative label
  • Mario Commodo, Gabriella Tessitore, Gianluigi De Falco, Annalisa Bruno, Patrizia Minutolo, Andrea D'Anna (2015)
    Further details on particle inception and growth in premixed flames
    in Proceedings of the Combustion Institute
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Mario Commodo, Gabriella Tessitore, Gianluigi De Falco, Annalisa Bruno, Patrizia Minutolo, Andrea D'Anna (literal)
Pagina inizio
  • 1795 (literal)
Pagina fine
  • 1802 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 35 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istituto di Ricerche sulla Combustione, CNR, P.le Tecchio 80, 80125 Napoli, Italy Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale - Universit√† degli Studi di Napoli Federico II, P.le Tecchio 80, 80125 Napoli, Italy ENEA, UTTP NANO, Centro Ricerche Portici, Portici, Italy (literal)
Titolo
  • Further details on particle inception and growth in premixed flames (literal)
Abstract
  • Soot inception in flames remains mostly unknown. What are, if any, the differences between inception particles formed in non-sooting and sooting flames, and to what extent soot formation is governed primarily by coagulation or by a different composition/aromatization of inception particles are open questions. In this work, the initial particle growth occurring in premixed flames of ethylene has been investigated. On line size-selected photoionization efficiency of inception particles produced in various flames has been measured. Structural/chemical differences of both nucleating and growing particles have been additionally investigated by off-line cyclic voltammetry, Raman spectroscopy, and light absorption. Results show that the size of aromatic domains within particles slightly increases when moving from flames in which the particle size distribution remains nearly constant and mono-modal in the nanometer range along the flame height, to flames in which particle coagulation gives rise to the formation of a second mode constituted by larger but still nanometric particles. Only in particles of this latter mode, d ? 10 nm, the first appearance of stacking of polyaromatic units is observed. On this basis, it has been hypothesized that two graphitization processes occur during the first stages of soot inception: a slight increase of in plane aromatic islands in primary particles and the formation of aromatic plane stacks in coagulated primary particles. This second type of coagulating-graphitization process explains the closure of the band gap observed in the grown particles respect to the primary ones, and hence the change of optical properties, towards the typical values observed in soot. (literal)
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