Abstract.
The effect of heat treatment on silica aerogel has been studied by a positron age–momentum correlation technique and infrared measurement. A difference was observed between the momentum distributions of the electrons on the first layers of the silica aerogel grain surfaces and the electrons in the grains in an as-supplied sample, but not in the sample heat treated at 800 °C. A large change in the S parameter for the momentum distribution of the electrons on the first layer occurs around 200 °C. This change correlates well with that of the infrared spectra, which show oxidation of the methoxyl groups at temperatures above around 200 °C. This correlation reveals that those groups are mainly located on the first layer of the silica grains.
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Received: 13 November 2000 / Accepted: 23 July 2001 / Published online: 30 October 2001
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Suzuki, N., Oonishi, T., Hyodo, T. et al. Study of silica aerogel grain surfaces by using a positron age–momentum correlation technique . Appl Phys A 74, 791–795 (2002). https://doi.org/10.1007/s003390100970
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DOI: https://doi.org/10.1007/s003390100970