Raman spectrum and structure of silica aerogel

DOI PDF 被引用文献1件
  • G. E. Walrafen
    Chemistry Department, Howard University, Washington, D.C. 20059
  • M. S. Hokmabadi
    Chemistry Department, Howard University, Washington, D.C. 20059
  • N. C. Holmes
    University of California, Lawrence Livermore National Laboratory, Livermore, California 94550
  • W. J. Nellis
    University of California, Lawrence Livermore National Laboratory, Livermore, California 94550
  • S. Henning
    University of Lund, Sweden

書誌事項

公開日
1985-03-01
DOI
  • 10.1063/1.448292
公開者
AIP Publishing

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説明

<jats:p>Raman spectra have been obtained from silica aerogel, a porous low-density material having grain sizes near 70 Å. The Raman spectra are qualitatively similar to those from fused silica, thus indicating that the aerogel is amorphous. However, a greatly intensified peak (relative to ordinary fused silica) occurs near 478 cm−1 and is assigned to small rings, e.g., six (3-SiO) or eight (4-SiO) membered. Such rings may be more important in the aerogel than in fused silica, but the observed absence of the 600 cm−1 ring peak indicates that only one ring type, e.g., eight membered, is predominant. Other marked frequency and intensity changes in the Si–O–Si bending and Si–O stretching region, compared to fused silica, were also observed.</jats:p>

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