Mechanical and Acoustic Properties of Silica Aerogel
Aerogel is not only a fascinating superinsulating material  but also exhibits unusual acoustic and mechanical properties. This was found recently , when we measured the longitudinal sound velocity cℓ in aerogel, cℓ varied between about 100 and 300 m/s for aerogel densities between 70 to 300 g/l. . To our knowledge these are the lowest sound velocities ever reported for inorganic solid materials. Accordingly aerogel — if compared to silica glass — has an extremely small Young’s modulus in the order of 106 to 107 N/m2  and therefore can be compressed easily.
KeywordsPorosity Shrinkage Percolate
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