Plastic densification in silica aerogels

Autor:	Vincent Gibiat, R. Sempere, Pierre Delord, Thierry Woignier, I. Beurroies, Jean Phalippou
Rok vydání:	1999
Předmět:	Materials science Small-angle X-ray scattering Scattering Mineralogy Sintering Aerogel Condensed Matter Physics Microstructure Electronic Optical and Magnetic Materials Composite material Elasticity (economics) Instrumentation Sol-gel Shrinkage
Zdroj:	Scopus-Elsevier
ISSN:	1286-0050 1286-0042
DOI:	10.1051/epjap:1999183
Popis:	Under isostatic pressure aerogels display an irreversible shrinkage caused by plastic deformation. As a consequence of this plastic shrinkage it is possible to densify, and thus to modify the elastic properties of aerogels. We show that the elasticity of the material is strongly influenced by structural transformation, and we observe a weakening of the network during the first stage of densification. The structural evolution, followed by Small Angle X-ray Scattering, shows that the densification mechanism is different from the one obtained by a sintering at high temperature. The densification mechanism induces a textural change at the periphery of the constitutive clusters but not inside, in contrast to viscous sintering.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4645913a152d44acbf6e1794d57f27b1 https://doi.org/10.1051/epjap:1999183 Zobrazit plný text záznamu