Ordered and Hydrothermally Stable Cubic Periodic Mesoporous Organosilicas with SBA-1 Mesostructures: Synthesis, Characterization, Solid-State NMR Spectroscopy, and DFT Calculations
作者： Yu-Chi Pan , Hao-Yiang Wu , Guang-Liang Jheng , Hui-Hsu Gavin Tsai , Hsien-Ming Kao
DOI: 10.1021/JP807534M
关键词:
摘要: Periodic mesoporous organosilicas (PMOs) based on the cubic SBA-1 mesostructure (Pm3n mesophase) were synthesized by co-condensation of tetraethoxysilane (TEOS) and 1,2-bis(triethoxysilyl)ethane (BTEE) under acidic conditions using cetyltriethylammonium bromide (CTEABr) as a structure-directing agent. The ethane-bridged PMO materials thus obtained characterized powder X-ray diffraction (XRD), solid-state 13C 29Si NMR spectroscopy, thermogravimetric analysis (TGA), nitrogen sorption measurements. maximum BTEE contents that can be incorporated into pore wall without degrading Pm3n up to 60% (based silica). resulting hydrothermally stable 120 h in boiling water with only slight decrease their structural properties, whereas structure pure silica counterpart material was completely collapsed after such treatment. presence ethane groups led more hydrophobic environment thus...
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