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Titolo:
BRILLOUIN-SCATTERING STUDY OF SINTERED AND COMPRESSED AEROGELS
Autore:
CALAS S; LEVELUT C; WOIGNIER T; PELOUS J;
Indirizzi:
UNIV MONTPELLIER 2,LAB VERRES,UMR 5587,PL E BATAILLON F-34095 MONTPELLIER 05 FRANCE
Titolo Testata:
Journal of non-crystalline solids
fascicolo: 1, volume: 225, anno: 1998,
pagine: 244 - 247
SICI:
0022-3093(1998)225:1<244:BSOSAC>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
SILICA AEROGELS;
Keywords:
BRILLOUIN SCATTERING STUDY; SINTERED AND COMPRESSED AEROGELS; ELASTIC PROPERTIES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
16
Recensione:
Indirizzi per estratti:
Citazione:
S. Calas et al., "BRILLOUIN-SCATTERING STUDY OF SINTERED AND COMPRESSED AEROGELS", Journal of non-crystalline solids, 225(1), 1998, pp. 244-247

Abstract

Elastic properties of densified aerogels were investigated by Brillouin light scattering in silica aerogels densified by viscous sintering and isostatic compression. Sound velocity and acoustic attenuation characterize the evolution of the elastic properties vs. the bulk densityfor the two sets of samples. Elastic modulus increases strongly during sintering while the attenuation alpha decreases, which is coherent with a larger connectivity in the solid network. Viscous flow sinteringcreates new siloxane bonds, eliminates pores and as expected, the aerogel stiffens. Compressed aerogel has a completely different behavior. In the low pressure range, elastic modulus decreases and alpha rises. This is attributed to breakage of links between clusters during compression. Weakening of the aerogels is the consequence of large strain of the solid network. For higher pressure, the density increase is accompanied by stiffening, suggesting that condensation occurs more than link breakage. (C) 1998 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 17:53:39