In this study, we used advanced spectroscopic methods to study an ethylene laminar non-smoking diffusion flame. The objective of the work was to study precursor particles in the flame region separating the PAH- and soot-zone of the flame, named the "dark zone" of the flame following the definition given by Vander Wal (Combust. Flame 109 (1997) 399-414). Precursor species were investigated by static and dynamic fluorescence, excited in the far and near UV with a picosecond laser source. In order to demonstrate the attribution of fluorescence signals to particles, rotational motion of fluorescing compounds was investigated by in situ time resolved fluorescence anisotropy (TRFA). From the analysis of the decay time of the fluorescence anisotropy, we estimated the diameter of the photo-selected species that can absorb excitation pulses and emit fluorescence. Measurements were performed as a function of the flame radius and height form the fuel nozzle. Particles with molecular-like spectroscopic properties, with average sizes ranging from 10 to 20 nm were detected in the center of the flame

Fluorescence anisotropy in a diffusion flame to shed light in the dark region / Commodo, M. A.; Sgro, L. A; Wang, X.; DE LISIO, Corrado; Minutolo, P.. - In: PROCEEDINGS OF THE COMBUSTION INSTITUTE. - ISSN 1540-7489. - 34:1(2013), pp. 1845-1852. [10.1016/j.proci.2012.06.052]

Fluorescence anisotropy in a diffusion flame to shed light in the dark region

DE LISIO, CORRADO;
2013

Abstract

In this study, we used advanced spectroscopic methods to study an ethylene laminar non-smoking diffusion flame. The objective of the work was to study precursor particles in the flame region separating the PAH- and soot-zone of the flame, named the "dark zone" of the flame following the definition given by Vander Wal (Combust. Flame 109 (1997) 399-414). Precursor species were investigated by static and dynamic fluorescence, excited in the far and near UV with a picosecond laser source. In order to demonstrate the attribution of fluorescence signals to particles, rotational motion of fluorescing compounds was investigated by in situ time resolved fluorescence anisotropy (TRFA). From the analysis of the decay time of the fluorescence anisotropy, we estimated the diameter of the photo-selected species that can absorb excitation pulses and emit fluorescence. Measurements were performed as a function of the flame radius and height form the fuel nozzle. Particles with molecular-like spectroscopic properties, with average sizes ranging from 10 to 20 nm were detected in the center of the flame
2013
Fluorescence anisotropy in a diffusion flame to shed light in the dark region / Commodo, M. A.; Sgro, L. A; Wang, X.; DE LISIO, Corrado; Minutolo, P.. - In: PROCEEDINGS OF THE COMBUSTION INSTITUTE. - ISSN 1540-7489. - 34:1(2013), pp. 1845-1852. [10.1016/j.proci.2012.06.052]
File in questo prodotto:
File Dimensione Formato  
fluorescence.pdf

non disponibili

Descrizione: Articolo principale
Tipologia: Altro materiale allegato
Licenza: Accesso privato/ristretto
Dimensione 449.6 kB
Formato Adobe PDF
449.6 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/649840
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 35
  • ???jsp.display-item.citation.isi??? 7
social impact