Sigoli, Fernando Aparecido [UNESP]Feliciano, Sérgio [UNESP]Giotto, Marcus ViniciusDavolos, Marian Rosaly [UNESP]Jafelicci Júnior, Miguel [UNESP]2014-05-202014-05-202003-07-01Journal of the American Ceramic Society, v. 86, n. 7, p. 1196-1201, 2003.0002-7820http://hdl.handle.net/11449/130494A 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.1196-1201engAdsorption isothermsDesorptionGlassHeat treatmentHydrothermal synthesisInfrared spectroscopyMicrostructureNuclear magnetic resonancePorosityPorous materialsScanning electron microscopySteamSurface treatmentX ray powder diffractionMercury intrusion porosimetrySilicaArtigo10.1111/j.1151-2916.2003.tb03447.xWOS:000184281300022Acesso restrito2-s2.0-004184260442848093425462877182671143702858