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Polymer-templated organosilicas with hexagonally ordered mesopores: the effect of organosilane addition at different synthesis stages
Authors:Rafal M Grudzien  Bogna E Grabicka  Ryan Felix  Mietek Jaroniec
Institution:(1) Chemistry Department, Kent State University, Kent, OH, USA
Abstract:Two series of ordered mesoporous organosilica (OMO) SBA-15 materials with surface and bridging groups were fabricated by varying the organic precursor addition at different synthesis stages. The consequence of the delayed introduction of organic precursor on the structural and adsorption properties of the resulting OMOs was investigated. The OMOs studied were synthesized via co-condensation of tetraethyl orthosilicate (TEOS) and ureidopropyltrimethoxysilane (UPS) as well as TEOS and bis(triethoxysilylpropyl) disulfide (BTDS) in the presence of poly(ethylene oxide)-poly(propylene oxide)- poly(ethylene oxide) triblock copolymer Pluronic P123 (EO20PO70EO20). The aforementioned OMOs were characterized by nitrogen adsorption-desorption isotherms at −196 °C and powder X-ray diffraction (XRD). Nitrogen adsorption isotherms were used to estimate the pore volume, mesopore diameter and the BET specific surface area, whereas the XRD data provided information about structural ordering and unit cell of the samples studied. Ryan Felix, undergraduate student from Oberlin College (Oberlin, OH, USA) participating in the NSF-REU program during Summer 2006.
Keywords:Channel-like mesostructures  Ordered mesoporous organosilicas  Nitrogen adsorption  SBA-15  Ureidopropyl surface group  Bis(propyl)disulfide bridging group
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