Globally Anisotropic High Porosity Silica Aerogels

Details Globally Anisotropic High Porosity Silica Aerogels Globally Anisotropic High Porosity Silica Aerogels

2007-11-22

arxiv.org/abs/0711.3495v1

Physics

Condensed Matter

Other Condensed Matter

18 pages, 14 figures, submitted to Journal of Non-Crystalline Solids

Scientific paper

10.1016/j.jnoncrysol.2008.05.047

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. 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.

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