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Nanostructural Investigation of Silica Aerogels

Published online by Cambridge University Press:  15 February 2011

Jue Wang ,
Jun Shen ,
Weidong Wu  and
Bin Zhou
Jue Wang
Affiliation:
Tongji University, Pohl Institute of Solid State Physics, Shanghai, China
Jun Shen
Affiliation:
Tongji University, Pohl Institute of Solid State Physics, Shanghai, China
Weidong Wu
Affiliation:
Tongji University, Pohl Institute of Solid State Physics, Shanghai, China
Bin Zhou
Affiliation:
Tongji University, Pohl Institute of Solid State Physics, Shanghai, China
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Abstract

Silica aerogels are sol-gel derived nanostructured materials with high porosities up to 99.8%. The nanostructures of silica aerogels are investigated by BET, SEM, SAXS techniques. A typical fractal structure is found especially for base-catalyzed aerogels. That is the aerogels are made of particles of size a, these particles form the branching and interconnecting networks up to an average cluster size ξ, At length scales above ξ, the material is an homogeneous assembly of such clusters; between a and ξ, the structure is fractal. Meanwhile, the effects of catalysis and aging on the structures are investigated and discussed. The reasons why SCD technique should be used are also deeply discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 351: Symposium V – Molecularly Designed Ultrafine/Nanostructured Materials , 1994 , 183
Copyright
Copyright © Materials Research Society 1994

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