Evidence of the early stage of porphyrin aggregation by enhanced Raman scattering and fluorescence spectroscopy (Articolo in rivista)

Type
Label
  • Evidence of the early stage of porphyrin aggregation by enhanced Raman scattering and fluorescence spectroscopy (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevE.76.011404 (literal)
Alternative label
  • Norberto Micali; Valentina Villari; Andrea Romeo; Maria Angela Castriciano; Luigi Monsù Scolaro (2007)
    Evidence of the early stage of porphyrin aggregation by enhanced Raman scattering and fluorescence spectroscopy
    in Physical review. E, Statistical, nonlinear, and soft matter physics (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Norberto Micali; Valentina Villari; Andrea Romeo; Maria Angela Castriciano; Luigi Monsù Scolaro (literal)
Pagina inizio
  • 11404 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 76 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 6 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 1 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istituto per i Processi Chimico-Fisici, CNR, Via La Farina 237, I-98123, Messina, Italy Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica and CIRCMSB, Università di Messina Salita Sperone 31, I-98166 Villagio S. Agata, Messina, Italy (literal)
Titolo
  • Evidence of the early stage of porphyrin aggregation by enhanced Raman scattering and fluorescence spectroscopy (literal)
Abstract
  • The early stage of fractal porphyrin diffusion-limited aggregation DLA, induced by addition of a polyamine, is observed in aqueous solution by enhanced Raman scattering and fluorescence quenching. The enhancement of Raman scattering is due to nonlinear optical properties typical of fractal composites. Although this early stage reaction-limited aggregation has been theoretically predicted by mean-field theory and molecular dynamics simulation, it is experimentally difficult to observe. During this initial stage, fluorescence quenching gives direct information on the decrease of the concentration of monomeric porphyrins, whereas Raman scattering through characteristic vibrational modes of the aggregate reports on the concentration of porphyrins in the aggregated form. These small clusters constitute the seeds for the DLA aggregation process leading to micrometric-sized fractals. (literal)
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