Fluorescence depolarization studies of sol-gel-derived glasses using a rigidochromic probe

John McKiernan; Jeffrey I. Zink; Bruce S. Dunn

doi:10.1117/12.132029

7 December 1992 Fluorescence depolarization studies of sol-gel-derived glasses using a rigidochromic probe

John McKiernan, Jeffrey I. Zink, Bruce S. Dunn

Proceedings Volume 1758, Sol-Gel Optics II; (1992) https://doi.org/10.1117/12.132029
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

The rigidochromic molecule rhenium(I)chlorotricarbonyl-2,2'-bipyridine was used in fluorescence depolarization experiments to probe the gelation, aging, and drying of silica and aluminosilicate sol-gel derived materials. These studies indicate that the local environment of the probe is fluid until well after gelation has occurred. Aluminosilicate gels show an increase in local viscosity after gelation while silica gels show no increase until the drying stage is begun. These results are compared to previous studies in which the shift of the emission band was used to indicate the rigidity in the local environment of the probe.

Citation Download Citation

John McKiernan, Jeffrey I. Zink, and Bruce S. Dunn "Fluorescence depolarization studies of sol-gel-derived glasses using a rigidochromic probe", Proc. SPIE 1758, Sol-Gel Optics II, (7 December 1992); https://doi.org/10.1117/12.132029

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