Synthesis and structure of cage-like mesoporous silica using different precursors

Synthesis and structure of cage-like mesoporous silica using different precursors

Author Fantini, M. C. A. Google Scholar
Kanagussuko, C. F. Google Scholar
Zilioti, G. J. M. Google Scholar
Martins, T. S. Autor UNIFESP Google Scholar
Institution Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Abstract In this work the synthesis of cubic, FDU-1 type, ordered mesoporous silica (OMS) was developed from two types of silicon source, tetraethyl orthosilicate (TEOS) and a less expensive compound, sodium silicate (Na(2)Si(3)O(7)), in the presence of a new triblock copolymer template Vorasurf 504 (EO(38)BO(46)EO(38)). for both silicon precursors the synthesis temperature was evaluated. for TEOS the effect of polymer dissolution in methanol and the acid solution (HCl and HBr) on the material structure was analyzed. for Na(2)Si(3)O(7) the influence of the polymer mass and the hydrothermal treatment time were the explored experimental parameters. the samples were examined by Small Angle X-ray Scattering (SAXS) and Nitrogen Sorption. for both precursors the decrease on the synthesis temperature from ambient, -25 degrees C, to -15 degrees C improved the ordered porous structure. for TEOS, the SAXS results showed that there is an optimum amount of hydrophobic methanol that contributed to dissolve the polymer but did not provoke structural disorder. the less electronegative Br-ions, when compared to Cl-, induced a more ordered porous structure, higher surface areas and larger lattice parameters. for Na(2)Si(3)O(7) the increase on the hydrothermal treatment time as well as the use of an optimized amount of polymer promoted a better ordered porous structure. (C) 2011 Elsevier B.V. All rights reserved.
Keywords Mesoporous silica
SAXS
Nitrogen sorption
Language English
Date 2011-06-01
Published in Journal of Alloys and Compounds. Lausanne: Elsevier Science Sa, v. 509, p. S357-S360, 2011.
ISSN 0925-8388 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent S357-S360
Origin http://dx.doi.org/10.1016/j.jallcom.2011.01.093
Access rights Closed access
Type Article
Web of Science ID WOS:000291463000079
URI http://repositorio.unifesp.br/handle/11600/33758

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