Globally anisotropic high porosity silica aerogels

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We discuss two methods by which high porosity silica aerogels can be engineered to exhibit global anisotropy. First, anisotropy can be introduced with axial strain (i.e. axial compression). In addition, intrinsic anisotropy can result during growth and drying stages and, suitably controlled, it can be correlated with preferential radial shrinkage in cylindrical samples. We have performed small angle X-ray scattering (SAXS) to characterize these two types of anisotropy. We show that global anisotropy originating from either strain or shrinkage leads to optical birefringence and that optical cross-polarization studies are a useful characterization of the uniformity of the imposed global anisotropy. (c) 2008 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2008-10
Language
English
Article Type
Article
Keywords

SCATTERING

Citation

JOURNAL OF NON-CRYSTALLINE SOLIDS, v.354, no.40-41, pp.4668 - 4674

ISSN
0022-3093
DOI
10.1016/j.jnoncrysol.2008.05.047
URI
http://hdl.handle.net/10203/88848
Appears in Collection
PH-Journal Papers(저널논문)
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