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Dynamics of Weakly Connected Solids: Sintering of Polymeric Aerogels

Published online by Cambridge University Press:  21 February 2011

D. W. Schaefer ,
D. Richter ,
B. Farago ,
C. J. Brinker ,
C. S. Ashley ,
B. J. Olivier  and
P. Seeger
D. W. Schaefer
Affiliation:
Sandia National Laboratories, P. 0. Box 5800, Albuquerque, NM 87185
D. Richter
Affiliation:
Institut Laue-Langevin, 38042 Grenoble, France
B. Farago
Affiliation:
Institut Laue-Langevin, 38042 Grenoble, France
C. J. Brinker
Affiliation:
Sandia National Laboratories, P. 0. Box 5800, Albuquerque, NM 87185
C. S. Ashley
Affiliation:
Sandia National Laboratories, P. 0. Box 5800, Albuquerque, NM 87185
B. J. Olivier
Affiliation:
Sandia National Laboratories, P. 0. Box 5800, Albuquerque, NM 87185
P. Seeger
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM, 87545
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Abstract

A combination of small angle scattering (SAS) and neutron spin-echo (NSE) spectroscopy is used to characterize the structure and dynamics of polymeric silica aerogels during sintering. The SAS data indicate that densification at short length scales precedes the densification at longer scales (comparable to that of the pore structure). Interpreted within the fracton model, the NSE data are consistent with an initial decrease in connectivity during relatively early stages of densification.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 166: Symposium J – Neutron Scattering for Materials Science , 1989 , 355
Copyright
Copyright © Materials Research Society 1990

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References

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