title: Local order in depolymerized silicate lattices.
abstract: In glycerol, near 200 degrees C, the silicate networks of mesoporous silicates and zeolites undergo a deep depolymerization process. In a few hours, depending on the initial concentration of the solid in glycerol and on the temperature, amorphous gels are obtained. In these gels, a fraction of the Si-O-Si bonds are transformed into Si-O-C. The constitutional aluminum remains bound to the silica network in the gel. The short range ordering is maintained to some extent: the size of the smallest structural unit in gels obtained from zeolites is in the range of the cubic nanometer, nm3.
authors.affiliation: Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Cd. Universitaria AP 70-186, C.P. 04510 México, DF.
authors.forename: Graciela
authors.initials: G
authors.lastname: Pacheco-Malagón
authors.forename: Patricia
authors.initials: P
authors.lastname: Pérez-Romo
authors.forename: Norma A
authors.initials: NA
authors.lastname: Sanchez-Flores
authors.forename: María L
authors.initials: ML
authors.lastname: Guzmán-Castillo
authors.forename: Carlos
authors.initials: C
authors.lastname: López
authors.forename: José M
authors.initials: JM
authors.lastname: Saniger
authors.forename: Francisco
authors.initials: F
authors.lastname: Hernández-Beltrán
authors.forename: José J
authors.initials: JJ
authors.lastname: Fripiat