http://www.cnr.it/ontology/cnr/individuo/prodotto/ID202430
Study on the contribution of different molecular weight species to the absorption UV-Visible spectra of flame-formed carbon species (Articolo in rivista)
- Type
- Label
- Study on the contribution of different molecular weight species to the absorption UV-Visible spectra of flame-formed carbon species (Articolo in rivista) (literal)
- Anno
- 2013-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1016/j.proci.2012.06.097 (literal)
- Alternative label
C. Russo, F. Stanzione, A. Ciajolo,
A. Tregrossi (2013)
Study on the contribution of different molecular weight species to the absorption UV-Visible spectra of flame-formed carbon species
in Proceedings of the Combustion Institute; Elsevier Inc., San Diego (Stati Uniti d'America)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- C. Russo, F. Stanzione, A. Ciajolo,
A. Tregrossi (literal)
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- Note
- ISI Web of Science (WOS) (literal)
- Scopu (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Dipartimento di Ingegneria Chimica, Universita` di Napoli \"Federico II\",
Istituto di Ricerche sulla Combustione, CNR (literal)
- Titolo
- Study on the contribution of different molecular weight species to the absorption UV-Visible spectra of flame-formed carbon species (literal)
- Abstract
- A reconstruction method of UV-Visible spectra, recently developed for discriminating the contribution
of different molecular weight (MW) species to the spectral properties of carbonaceous species formed in a
premixed ethylene flame, was applied to a benzene flame. The reliability and sensitivity of the technique in
detecting specific structural features of the carbonaceous species was demonstrated.
The flame-formed carbon species were deposited on quartz plates inserted in the soot formation region
of a premixed fuel-rich benzene flame. The dichloromethane-soluble (DCM-soluble) and dry soot fractions
were separated in a very wide MW range, from 200 to 1E11 u, by Size Exclusion Chromatography (SEC)
coupled with on-line UV-Visible spectroscopy. The optical band gap (Eg) and the UV peak position of
each MW-segregated fraction were evaluated by means of a spectral reconstruction procedure, to get
details on the carbon network structure in terms of sp2 and sp3 sites and size and stacking of the aromatic
units. Moreover, the MW-segregated fractions of the species soluble in DCM were also analyzed by
fluorescence emission spectroscopy and by atmospheric pressure laser desorption ionization-mass spectrometry
for determining their aromatic character.
The output of the spectral reconstruction procedure provided insights in the chemical structure and evolution
of carbonaceous species from Polycyclic Aromatic Hydrocarbons (PAH) to soot nuclei and finally to
soot aggregates. The comparison with data obtained in a premixed ethylene flame burning in similar temperature
conditions showed some structural differences in flame-formed carbonaceous species due to the
effect of the different chemical environment in which soot precursor are formed (literal)
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