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Title: Synthesis of large-pore methylene-bridged periodic mesoporous organosilicas and its implications
Authors: Bao, X.Y. 
Li, X.
Zhao, X.S. 
Issue Date: 16-Feb-2006
Citation: Bao, X.Y., Li, X., Zhao, X.S. (2006-02-16). Synthesis of large-pore methylene-bridged periodic mesoporous organosilicas and its implications. Journal of Physical Chemistry B 110 (6) : 2656-2661. ScholarBank@NUS Repository.
Abstract: In this article, we report the synthesis of methylene-bridged periodic mesoporous organosilicas (PMOs) of the SBA-15 type. The materials were characterized by SAXS, BET, NMR, FESEM, and TEM. It was found that the synthesis of methylene-bridged SBA-15 PMOs requires more rigorous conditions than that of SBA-15 PMOs bearing organic bridges other than methylene. A mild acidic environment, which slows down the hydrolysis and condensation rates of the precursor, with the assistance of a salt, which enhances precursor-template interaction, should be used to synthesize high-quality large-pore methylene-bridged PMOs. We attributed this to the fast hydrolysis and condensation rates and the rigid backbone of precursor 1,2-bis(triethoxysilyl) methylene. By examining and comparing the synthesis of three large-pore PMOs with different bridges, we concluded that the inductive, bridging, and conformation effects of the organic bridging group play an important role in the synthesis of large-pore PMO materials. © 2006 American Chemical Society.
Source Title: Journal of Physical Chemistry B
ISSN: 15206106
DOI: 10.1021/jp0561120
Appears in Collections:Staff Publications

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