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Utilize este identificador para citar ou criar um link para este item: http://acervodigital.unesp.br/handle/11449/130494
Título: 
Porous silica matrix obtained from pyrex class by hydrothermal treatment: Characterization and nature of the porosity
Autor(es): 
Instituição: 
  • Universidade Estadual Paulista (UNESP)
  • Universidade Federal de São Carlos (UFSCar)
ISSN: 
0002-7820
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.
Data de publicação: 
1-Jul-2003
Citação: 
Journal of the American Ceramic Society, v. 86, n. 7, p. 1196-1201, 2003.
Duração: 
1196-1201
Publicador: 
Amer Ceramic Soc
Palavras-chaves: 
  • 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
Fonte: 
http://dx.doi.org/10.1111/j.1151-2916.2003.tb03447.x
Endereço permanente: 
Direitos de acesso: 
Acesso restrito
Tipo: 
outro
Fonte completa:
http://repositorio.unesp.br/handle/11449/130494
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