Synthesis of large-pore methylene-bridged periodic mesoporous organosilicas and its implications

Bao, Xiao Ying, Li, Xu and Zhao, X. S. (2006) Synthesis of large-pore methylene-bridged periodic mesoporous organosilicas and its implications. Journal of Physical Chemistry B, 110 6: 2656-2661. doi:10.1021/jp0561120


Author Bao, Xiao Ying
Li, Xu
Zhao, X. S.
Title Synthesis of large-pore methylene-bridged periodic mesoporous organosilicas and its implications
Journal name Journal of Physical Chemistry B   Check publisher's open access policy
ISSN 1520-6106
1520-5207
Publication date 2006-02-16
Sub-type Article (original research)
DOI 10.1021/jp0561120
Volume 110
Issue 6
Start page 2656
End page 2661
Total pages 6
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
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.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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