Porous silica matrix obtained from pyrex class by hydrothermal treatment: Characterization and nature of the porosity
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
20/05/2014
20/05/2014
01/07/2003
|
Resumo |
A novel porous silica matrix has been prepared from Pyrex glass, using hydrothermal treatment under saturated-steam condition. This process makes it possible to obtain, in one step, a silica support formed of a homogeneously distributed and interconnected macropore microstructure. The new matrix contains silanol groups that can be used in reactions of surface modification to provide a hybrid material and a selective macrofiltration membrane, and also it can improve chemical inertness. The porous matrix is noncrystalline as obtained and, after thermal treatment at temperatures higher than 950degreesC, exhibits an X-ray pattern characteristic of alpha-cristobalite and low volume contraction. The present samples were characterized by scanning electron microscopy, mercury intrusion porosimetry, nitrogen adsorption-desorption isotherms, infrared spectroscopy, X-ray powder diffractometry, atomic absorption, and high-resolution solid-state nuclear magnetic resonance. The results present a new way of producing a macroporous silica matrix. |
Formato |
1196-1201 |
Identificador |
http://dx.doi.org/10.1111/j.1151-2916.2003.tb03447.x Journal of the American Ceramic Society, v. 86, n. 7, p. 1196-1201, 2003. 0002-7820 http://hdl.handle.net/11449/130494 10.1111/j.1151-2916.2003.tb03447.x WOS:000184281300022 2-s2.0-0041842604 |
Idioma(s) |
eng |
Publicador |
Amer Ceramic Soc |
Relação |
Journal of the American Ceramic Society |
Direitos |
closedAccess |
Palavras-Chave | #Adsorption isotherms #Desorption #Glass #Heat treatment #Hydrothermal synthesis #Infrared spectroscopy #Microstructure #Nuclear magnetic resonance #Porosity #Porous materials #Scanning electron microscopy #Steam #Surface treatment #X ray powder diffraction #Mercury intrusion porosimetry #Silica |
Tipo |
info:eu-repo/semantics/article |