Acoustic properties and potential applications of silica aerogels

Aerogel insulation for building applications: A state-of-the-art review

“…Sound velocities down to 40 m/s have been measured [21], whereas (non-monolith) commercial products claim to have a sound velocity of ~100 m/s through the structure [4]. Granular aerogels are exceptional reflectors of audible sound, making excellent barrier materials [18,23]. By combining multiple layers with different granular sizes, average attenuations of -60 dB has been found for a total thickness of only 7 cm [60].…”

Aerogel Sintering: From Optical Glasses to Nuclear Waste Containment

“…For such an application, the thickness of the aerogel layer must be close to λ/4, corresponding to a few millimeters. However, a perfect mechanical contact between the transductor and the aerogel is difficult to achieve (Gronauer and Fricke 1986;Gibiat et al 1995).…”

Development of Nanoporous Aerogel-Based Thermal Insulation Products:'Make in India' Initiative

“…Additionally, the lightweight and yet superior insulation performance leads to cost saving due to reduced volume, space and weight of the material, which requires less transportation cost, and storage and labour charges. Other major sectors are architectural [28][29][30][31][32] , automobiles [33][34][35] , cryogenics [36][37][38] , aerospace 39,40 and textiles 41 .…”