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2007-05-14 - Article/Dans un journal avec peer-review - Anglais - 1 page(s)

Vallée R.A.L., Baruah M., Hofkens J., De Schryver F.C., Boens N., Van Der Auweraer M., Beljonne David , "Fluorescence Lifetime Fluctuations of Single Molecules Probe the Local Environment of Oligomers around the Glass Transition Temperature" in Journal of Chemical Physics, 126, 18, 184902

  • Edition : American Institute of Physics, New York (NY)
  • Codes CREF : Physique de l'état condense [struct., électronique, etc.] (DI1266)
  • Unités de recherche UMONS : Chimie des matériaux nouveaux (S817)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
Texte intégral :

Abstract(s) :

(Anglais) Single molecule fluorescence experiments have been performed on a BODIPY-based dye embedded in oligo(styrene) matrices to probe the density fluctuations and the relaxation dynamics of chain segments surrounding the dye molecules. The time-dependent fluorescence lifetime of the BODIPY probe was recorded as an observable for the local density fluctuations. At room temperature, the mean fraction of holes surrounding the probes is shown to be unaffected by the molecular weight in the glassy state. In contrast, the free volume increases significantly in the supercooled regime. These observations are discussed in the framework of the entropic theories of the glass transition.

Notes :
  • (Anglais) Publié en ligne le 10 mai 2007
Identifiants :
  • DOI : 10.1063/1.2728902