Study of silica aerogel grain surfaces by using a positron age-momentum correlation technique

N. Suzuki, T. Oonishi, T. Hyodo, T. Chang

Research output: Contribution to journalArticle

5 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)791-795
Number of pages5
JournalApplied Physics A: Materials Science and Processing
Volume74
Issue number6
DOIs
Publication statusPublished - Jun 1 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

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