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Improving the visible transparency of silica aerogels

Publication Type

Journal Article

Date Published

10/1994

Authors

Cao, Wanqing, Arlon J. Hunt

DOI

10.1016/0022-3093(94)90206-2

Abstract

Silica alcogels have been prepared in two steps, first in an acid and then in a base to control the relative rates of hydrolysis and condensation of TEOS. Increasing the H₂O/TEOS ratio in the base-catalyzed step was the most important factor in reducing light scattering of the alcogel. The two-step gel could be practically made with H₂O/TEOS = 30, achieving a scattering intensity less than 1/5 that of the best one-step gel. Lower scattering of the gel results in an aerogel with improved visible transparency and more homogeneous microstructure. TEM observation reveals that the two-step aerogel has a microstructure containing both linear polymers and colloidal particles that are cross-linked to a gel network.

Journal

Journal of Non-Crystalline Solids

Volume

176

Year of Publication

1994

Issue

Notes

0022-3093doi: DOI: 10.1016/0022-3093(94)90206-2

Organization

Laser Technologies Group, Energy Storage and Distributed Resources Division