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Aerogels acoustic properties

As already mentioned, the sound velocity is measured with much better precision than the elastic moduli. Therefore, the generally small influence of some other parameters on the acoustic properties of aerogels is experimentally accessible. It is striking that in aerogels of different materials, the sound velocity was found to be lowered by uniaxial compression [52]. In normal solid ma-... [Pg.323]

Conroy JFT, Hosticka B, Davis SC, Smith AN, Norris PM (1999) Evaluation of the acoustic properties of silica aerogels MD (Am Soc Mech Eng) 82 25-33... [Pg.44]

The acoustic properties of ultrasonic transducers with an aerogel acoustic matching layer were studied using a one-dimensional Krimholtz-Leedom-Matthaei (KLM) equivalent circuit [10, 11] to simulate using computer. Figure 33.6 shows the structure of the... [Pg.751]

Gibat V, Lefeuvre O, Woignier T, Pelous J, Phalippou J (1995) Acoustic Properties and Potential Applications of Silica Aerogels. Journal of Non-Crystalline Solids 186 244-255... [Pg.760]

Gibiat V., Lefeuvre 0., Woignier T., Pelous J., Phalippou J. Acoustic properties and potential applications of silica aerogels. J. Non-Cryst. Solids 1995 186 244-255 Hair L.M., Owens L., Tillotson T., Froba M., Wong J., Thomas GJ., Medlin DI.., Local, nano-and micro-structures of mixed metal oxide aerogels for catalyst applications. J. Non-Cryst. Solids 1995 186 168-176... [Pg.1271]

Gronauer M., Fricke J. Acoustic properties of microporous Si02 aerogels. Acoustica 1986 59 177-185... [Pg.1290]

Gibiat V., Lefeuvre, O., Woigniert, T., Pelous, J., and Phalippou, J. (1995) Acoustic properties and potential applications of silica aerogels. J. Non-Cryst. Solids, 186, 244-255. [Pg.1410]

The techniques presented here allow to produce ultralight materials with anisotropic properties. Optical absorption and emission, hydrophobicity mechanical strength and index of refraction can be tuned within the same monolith. Conceivable applications of our technique include fabrication of photonic devices, membranes, radiation collimators, fuel cell electrodes as well as hierarchically structured materials that combine mechanical strength with the acoustic and thermal insulation properties of conventional aerogels. [Pg.416]

Red line and black line are the calculated results of aerogel ultrasonic transducer and ultrasonic transducer with conventional matching layer respectively. The properties of conventional acoustic matching layer are 0.54 x 10 kg/m density, 2,400 m/s acoustic velocity, and 1,296 X 10 kg/m s acoustic impedance. [Pg.756]

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See also in sourсe #XX -- [ Pg.323 , Pg.330 ]



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