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Title:Intermolecular interactions in supercritical fluid solutions from fluorescence spectroscopy
Author(s):Brennecke, Joan F.
Doctoral Committee Chair(s):Eckert, Charles A.
Department / Program:Engineering, Chemical
Discipline:Engineering, Chemical
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Chemical
Abstract:Much of the unusual behavior in supercritical fluids (SCF's), including enhanced solubilities, synergistic effects of mixed solutes, and entrainer effects, may be explained by a region around the solute that has a higher density than the bulk. We present a new technique to investigae SCF's using fluorescence spectroscopy to probe the local interactions. In contrast to thermodynamic measurements, this technique determines the strength of interactions on a molecular scale, which is important in the development of more accurate thermodynamic models. For pyrene, naphthalene, dibenzofuran and carbazole in SCF CO$\sb2$, C$\sb2$H$\sb4$ and CF$\sb3$H, the results indicate stronger solute/solvent interactions near the critical point and local densities that are liquid-like, even when the bulk density is quite low. We also present excimer fluorescence data that emphasize the importance of solute/solute interactions in dilute supercritical fluid solutions. Finally, results from exciplex fluorescence studies of a solute/SCF/entrainer system indicate a dramatic solvent effect on the photophysical kinetics.
Issue Date:1989
Rights Information:Copyright 1989 Brennecke, Joan F.
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9010810
OCLC Identifier:(UMI)AAI9010810

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