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Room-temperature creep of nanoporous silica

Published online by Cambridge University Press:  24 January 2011

S.O. Kucheyev ,
K.A. Lord  and
A.V. Hamza
S.O. Kucheyev*
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94551
K.A. Lord
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94551
A.V. Hamza
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94551
*
a)Address all correspondence to this author. e-mail: kucheyev@llnl.gov
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Abstract

We show that low-density nanoporous silica monoliths (aerogels), in contrast to the case of full-density silica, exhibit pronounced time-dependent deformation during indentation at room temperature. Logarithmic indentation creep and stress relaxation are revealed, with an exponential dependency of the creep constant on the applied stress. Such time-dependent deformation is attributed to stress corrosion fracture of nanoligaments that have a large surface-to-bulk atomic fraction.

Keywords

AerogelStress/Strain RelationshipNano-Indentation

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Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 6 , 28 March 2011 , pp. 781 - 784
Copyright
Copyright © Materials Research Society 2011

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