Please use this identifier to cite or link to this item:
|Title:||Functionalization of large-pore mesoporous silicas with organosilanes by direct synthesis|
Large-pore mesoporous silicas
|Citation:||Chong, A.S.M., Zhao, X.S., Kustedjo, A.T., Qiao, S.Z. (2004-07-08). Functionalization of large-pore mesoporous silicas with organosilanes by direct synthesis. Microporous and Mesoporous Materials 72 (1-3) : 33-42. ScholarBank@NUS Repository. https://doi.org/10.1016/j.micromeso.2004.04.015|
|Abstract:||Functionalization of porous solids plays an important role in many technical aspects such as enzyme immobilization. In this study, functionalized large-pore mesoporous materials with a P 6 mm symmetry were synthesized by co-condensation of tetraethyl orthosilicate (TEOS) and organosilanes 3-aminopropyltriethoxysilane (APTES), 3-mercaptopropylmethoxysilane (MPTMS), phenyltrimethoxysilane (PTMS), vinyltriethoxysilane (VTES), and 4-(triethoxysilyl)butyronitrile (TSBN) in the presence of nonionic triblock co-polymer Pluronic P123 under acidic conditions. The effect of the organosilanes present in the initial synthesis mixtures on the mesostructural properties of the resultant materials was systematically studied by varying the molar ratios of organosilane to TEOS. Solid-state nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and elemental analysis data demonstrated the presence of the functional groups both on the pore surface and inside the solid matrixes. Nitrogen adsorption, small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM) results showed different levels of disorder of the mesostructures upon incorporation of the functional groups, which are dependent upon the type and amount of the organosilanes present in the initial synthesis mixtures. Among the organosilanes studied, their disruptive effects on the formation of the mesostructure follow VTES < TSBN < PTMS ≅ MPTMS < APTES. Such different effects are interpreted in terms of their different behaviors under acidic synthetic conditions and steric molecular sizes and shapes, which have direct impact on interactions of P123 with silicate species and on micellation of P123 template. © 2004 Elsevier Inc. All rights reserved.|
|Source Title:||Microporous and Mesoporous Materials|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Sep 18, 2018
WEB OF SCIENCETM
checked on Sep 3, 2018
checked on Sep 22, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.