Polymer-templated organosilicas with hexagonally ordered mesopores: the effect of organosilane addition at different synthesis stages |
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Authors: | Rafal M Grudzien Bogna E Grabicka Ryan Felix Mietek Jaroniec |
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Institution: | (1) Chemistry Department, Kent State University, Kent, OH, USA |
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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. |
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Keywords: | Channel-like mesostructures Ordered mesoporous organosilicas Nitrogen adsorption SBA-15 Ureidopropyl surface group Bis(propyl)disulfide bridging group |
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