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.
KeywordsSound Velocity Silica Glass Silica Aerogel Aerogel Sample Primary Si02 Particle
Unable to display preview. Download preview PDF.
- 1.P. Scheuerpflug, R. Caps, D. Büttner and J. Fricke, “Apparent Thermal Conductivity of Evacuated SiO2-Aerogel Tiles Under Variation of Radiative Boundary Conditions”, Int. J. Heat and Mass Transfer (to be published 1985 )Google Scholar
- 2.M. Gronauer, D. Büttner and J. Fricke, “Sound Velocities in Microporous SiO2- Aerogel Tiles”, Report E12-1284-2(1984) Phys. Inst. Universität, D-8700 WürzburgGoogle Scholar
- 3.M. Gronauer and J. Fricke, “Acoustic Properties of Microporous SiO2-Aerogel”, Report E12-0685(1985), Phys. Inst. Universität, D-8700 Würzburg (to be published in Acustica)Google Scholar
- 4.M. Gronauer, D. Büttner and J. Fricke, “Schallgeschwindigkeit in mikroporösen SiO2-Aerogel-Kacheln”, Fortschritte der Akustik -DAGA 85, Stuttgart 1985, p. 643Google Scholar
- 5.G. Poelz and R. Riethmiiller, Preparation of Silica Aerogel for Cerenkov Counters, DESY81-055,September 1981, Hamburg and references thereinGoogle Scholar
- 7.G. Poelz, DESY/Hamburg, private communicationGoogle Scholar
- 8.Aerogel pellets with diameters between 1 and 6 mm and densities around 200 g/1 were provided by BASF/LudwigshafenGoogle Scholar
- 11.E. Stoll, C. Domb, T. Schneider, 13th. IUPAP Conference on Statistical Physics, Haifa, Israel 1977Google Scholar
- 13.H.P. Meissner, A.S. Michaels and R. Kaiser, I&EC Process Design and Development 3, 203 (1964)Google Scholar