Document Detail


Synthesis of large-pore methylene-bridged periodic mesoporous organosilicas and its implications.
MedLine Citation:
PMID:  16471868     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
Xiao Ying Bao; Xu Li; X S Zhao
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  110     ISSN:  1520-6106     ISO Abbreviation:  J Phys Chem B     Publication Date:  2006 Feb 
Date Detail:
Created Date:  2006-02-13     Completed Date:  2007-08-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101157530     Medline TA:  J Phys Chem B     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2656-61     Citation Subset:  IM    
Affiliation:
Department of Chemical and Biomolecular Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119620.
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MeSH Terms
Descriptor/Qualifier:
Magnetic Resonance Spectroscopy / methods
Microscopy, Electron, Transmission / methods
Organosilicon Compounds / chemical synthesis*,  chemistry
Particle Size
Porosity
Scattering, Small Angle
Sensitivity and Specificity
Silicon Dioxide / chemical synthesis*,  chemistry
X-Ray Diffraction
Chemical
Reg. No./Substance:
0/Organosilicon Compounds; 0/SBA-15; 7631-86-9/Silicon Dioxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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