Compressed Silica Aerogels for the Study of Superfluid 3He
  We have performed Small Angle X-ray Scattering (SAXS) on uniaxially strained aerogels and measured the strain-induced structural anisotropy. We use a model to connect our SAXS results to anisotropy of the 3He quasiparticle mean free path in aerogel. 
J. Pollanen, H. Choi, J.P. Davis, S. Blinstein, T.M. Lippman, L.B.   Lurio, N. Mulders, and W.P. Halperin