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Istituto di ricerche sulla combustione
Soppresso il 01/10/2020

Torna all'elenco Contributi in rivista anno 2020

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Nanosecond laser irradiation of soot particles: insights on structure and optical properties

Anno di pubblicazione: 2020

Formato: Elettronico Cartaceo

Autori: Migliorini F.; De Iuliis S.; Dondè R.; Commodo M., Minutolo P., D'Anna A.

Affiliazioni autori: 1-3: Istituto di Chimica della Materia Condensata e Tecnologie per l'Energia, CNR-ICMATE, Via R. Cozzi 53, Milano, 20125, Italy / 4-5: Istituto di Ricerche sulla Combustione, CNR, P.le Tecchio 80, Napoli, 80125, Italy / 6: Università degli Studi di Napoli Federico II, Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, P.le V. Tecchio 80, Napoli, 80125, Italy

Autori CNR:

  • MARIO COMMODO
  • SILVANA DE IULIIS
  • ROBERTO DONDE'
  • FRANCESCA MIGLIORINI
  • PATRIZIA MINUTOLO

Lingua: inglese

Abstract: In spite of the advances in laser diagnostics in combustion, the effect of rapid laser irradiation on the physical/chemical properties of soot particles is far from being comprehensively understood. Optical properties, particle nanostructure and aggregate size of laser-irradiated soot particles are analyzed in this paper. Carbonaceous particles sampled from nitrogen-quenched diffusion flames of ethylene and methane are irradiated on-line by a 1064-nm short laser pulse. Wavelength-resolved extinction measurements in the visible range are used to follow their transformation by varying the laser energy density. A variation of the extinction coefficient of the irradiated particles compared to the extinction coefficient of the pristine ones is observed, especially for ethylene soot. The particle nanostructures are analyzed by Raman spectroscopy and the effect of laser irradiation on aggregate structure is evaluated by measuring particle size distributions. The results indicate that both soot nanostructure and optical properties are strongly dependent on the laser energy density when irradiated by a laser source. This is significant for ethylene soot, while for methane soot the degree of variation of such properties is less pronounced, at least in the investigated heating conditions.

Lingua abstract: inglese

Pagine da: 110064-1

Pagine a: 110064-8

Pagine totali: 8

Rivista:

Experimental thermal and fluid science Elsevier,
Paese di pubblicazione: Stati Uniti d'America
Lingua: inglese
ISSN: 0894-1777

Numero volume: 114

DOI: 10.1016/j.expthermflusci.2020.110064

Referee: Sì: Internazionale

Stato della pubblicazione: Published version

Indicizzato da:

  • Scopus [2-s2.0-85079030679]
  • ISI Web of Science (WOS) [000519655200012]

Parole chiave:

  • Soot
  • laser-heating
  • LII
  • nanostructure
  • optical properties
  • Raman spectroscopy.

URL: https://www.sciencedirect.com/science/article/pii/S0894177719316681

Data di accettazione: 28/01/2020

Altre informazioni: Highlights : o Soot physicochemical properties are strongly affected by laser irradiation. o The degree of variation of such properties dependents on the fuel composition. o The extinction coefficient decreases increasing laser energy density. o Raman Spectroscopy analysis emphasizes differences in soot nanostructure. o Aggregate fragmentation is observed for all the laser-irradiated particles. The authors acknowledge thefinancial support from the PRINproject 2017PJ5XXX:"Modeling and Analysis of carbon nanoparticles for innovative applications Generated dIrectly and Collected DUringcombuSTion (MAGIC DUST)"

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