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Title: Fluorescence lifetime fluctuations of single molecules probe the local environment of oligomers around the glass transition temperature
Authors: Vallee, R. A. L ×
Baruah, M
Hofkens, Johan
De Schryver, F. C
Boens, Noël
Van der Auweraer, Mark
Beljonne, D #
Issue Date: May-2007
Publisher: American Institute of Physics
Series Title: Journal of Chemical Physics vol:126 issue:18
Article number: 184902
Abstract: 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. (C) 2007 American Institute of Physics.
ISSN: 0021-9606
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
× corresponding author
# (joint) last author

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