title: Visualization of Surface Gelation Processes in a Doped Sol-Gel Glass.
abstract: Pulsed photoacoustic spectroscopy has enabled depth-resolved, in situ measurements of the chemical changes that occur in a sol-gel process to be examined. By use of beta-carotene as a probe to determine the efficiency of heat transfer to the immediate molecular environment in thin and thick samples, separate surface and bulk gelation processes in a sol-gel material have been observed.
authors.affiliation: Center for Supramolecular Science and Department of Chemistry, University of Miami, P.O. Box 249118 Coral Gables, FL 33124-0431 (USA).
authors.initials: G
authors.lastname: Puccetti
authors.initials: RM
authors.lastname: Leblanc