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Proceedings Paper

Stability of porous sol-gel silica to water diffusion: experimental and theoretical analysis
Author(s): Jon K. West; James M. Kunetz; Fernando G. Araujo; Larry L. Hench
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Paper Abstract

Understanding the stability of porous Type VI silica gel matrices during diffusion of water is important because this new material is being used as a host for optically active composites. Aqueous solutions are being used during processing as a carrier for optically active phases for: filters, graded index lenses, laser dyes, and scintillators. A pore wall model has been developed to calculate the wall thickness of Type VI porous silica-gel matrices. The Austin Method (AM1) Molecular Orbital calculations have been performed to model silica structures with dimensions close to those expected for the pore walls. A base line value for the mean pore wall thickness was determined from comparisons between the mode and experimental results. This value separates environmentally stable matrices from unstable gels during water diffusion (or percolation). A ring opening hydrolysis mechanism is proposed to explain the role of water in fracture of the porous sol-gel silica matrices.

Paper Details

Date Published: 13 October 1994
PDF: 9 pages
Proc. SPIE 2288, Sol-Gel Optics III, (13 October 1994); doi: 10.1117/12.189010
Show Author Affiliations
Jon K. West, Univ. of Florida (United States)
James M. Kunetz, Univ. of Florida (United States)
Fernando G. Araujo, Univ. of Florida (United States)
Larry L. Hench, Univ. of Florida (United States)

Published in SPIE Proceedings Vol. 2288:
Sol-Gel Optics III
John D. Mackenzie, Editor(s)

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