Promoted and controllable self-assembly of hydrolyzed siloxane and triblock copolymer under organic polyhydroxy acids

Li, Jin Jun, Mu, Zhen, He, Chi, Hu, Qin, Li, Lan Dong, Cheng, Jie, Hao, Zheng Ping and Qiao, Shi Zhang (2009) Promoted and controllable self-assembly of hydrolyzed siloxane and triblock copolymer under organic polyhydroxy acids. Industrial and Engineering Chemistry Research, 48 13: 6308-6314. doi:10.1021/ie900100g


Author Li, Jin Jun
Mu, Zhen
He, Chi
Hu, Qin
Li, Lan Dong
Cheng, Jie
Hao, Zheng Ping
Qiao, Shi Zhang
Title Promoted and controllable self-assembly of hydrolyzed siloxane and triblock copolymer under organic polyhydroxy acids
Journal name Industrial and Engineering Chemistry Research   Check publisher's open access policy
ISSN 0888-5885
1520-5045
Publication date 2009-07-01
Year available 2009
Sub-type Article (original research)
DOI 10.1021/ie900100g
Open Access Status
Volume 48
Issue 13
Start page 6308
End page 6314
Total pages 7
Editor Donald R Paul
Spiro D. Alexandratos
Place of publication Washington, DC, U.S.A.
Publisher American Chemical Society
Language eng
Subject C1
850402 Hydrogen-based Energy Systems (incl. Internal Hydrogen Combustion Engines)
090402 Catalytic Process Engineering
100708 Nanomaterials
Abstract Large-molecule polyhydroxy organic acids such as tartaric acid and citric acid were found to significantly promote the cooperative formation of mesoporous silica SBA-15 with homogeneous well-defined hexagonal mesostructure under much weaker acidities without addition of volatile inorganic acids; therefore a novel environmental benign route for SBA-15 synthesis was developed, It is suggested that the polar groups of polyhydroxy acid molecules can greatly strengthen the assembly interactions between the silica species and the triblock copolymer by providing hydrogen bonding. More interestingly, by controlling the strength of hydrogen-bonding interaction that is dependent on the concentration of carboxylic acids, the particle size of the product can be tailored. The silica with small particle size synthesized with a small amount of polyhydroxy acids was favorable support of palladium catalyst for the complete oxidation of volatile organic compounds in atmosphere, probably due to the facilitated diffusion of reactant molecules.
Formatted abstract
Large-molecule polyhydroxy organic acids such as tartaric acid and citric acid were found to significantly promote the cooperative formation of mesoporous silica SBA-15 with homogeneous well-defined hexagonal mesostructure under much weaker acidities without addition of volatile inorganic acids; therefore a novel environmental benign route for SBA-15 synthesis was developed, It is suggested that the polar groups of polyhydroxy acid molecules can greatly strengthen the assembly interactions between the silica species and the triblock copolymer by providing hydrogen bonding. More interestingly, by controlling the strength of hydrogen-bonding interaction that is dependent on the concentration of carboxylic acids, the particle size of the product can be tailored. The silica with small particle size synthesized with a small amount of polyhydroxy acids was favorable support of palladium catalyst for the complete oxidation of volatile organic compounds in atmosphere, probably due to the facilitated diffusion of reactant molecules.
Keyword Mesoporous silica materials
Block-copolymers
Molecular-sieves
Nonionic triblock
Isoelectric Point
2-step synthesis
SBA-15 materials
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID 2004CB719500
2006AA06A310
20807050
Institutional Status UQ

 
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Created: Thu, 03 Sep 2009, 17:56:03 EST by Mr Andrew Martlew on behalf of Functional Nanomaterials