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A silanol protection mechanism: Understanding the decomposition behavior of surfactants in mesostructured solids

Published online by Cambridge University Press:  11 March 2011

Dahai Pan
Affiliation:
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Changping, Beijing 102249, People’s Republic of China
Lingzhi Zhao
Affiliation:
Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People’s Republic of China
Kun Qian
Affiliation:
Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People’s Republic of China
Lei Tan
Affiliation:
Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People’s Republic of China
Liang Zhou
Affiliation:
Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People’s Republic of China
Jun Zhang
Affiliation:
Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People’s Republic of China
Xiaodan Huang
Affiliation:
Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People’s Republic of China
Yu Fan
Affiliation:
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Changping, Beijing 102249, People’s Republic of China
Haiyan Liu
Affiliation:
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Changping, Beijing 102249, People’s Republic of China
Chengzhong Yu*
Affiliation:
Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People’s Republic of China; and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, QLD 4072, Australia
Xiaojun Bao*
Affiliation:
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Changping, Beijing 102249, People’s Republic of China
*
a)Address all correspondence to these authors. e-mail: c.yu@uq.edu.au
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Abstract

The decomposition mechanism of block copolymer templates inside as-synthesized mesostructured solids has been systematically studied using solid-state 1H magic angle spinning nuclear magnetic resonance spectroscopy, thermogravimetric analysis, and high-vacuum Fourier transform infrared spectrometry. It is shown that there exists hydrogen-bonding interaction between silanols and block copolymers at the inorganic–organic interface in the self-assembled as-synthesized mesostructured solids, which plays an important role in protecting the surfactants against decomposition during the high-temperature hydrothermal treatment process. Increasing silanol concentration can enhance the hydrogen-bonding interaction and thus shows better “protection” effect. Moreover, the thermal decomposition of the block copolymer in as-synthesized mesostructured solids in air commences at higher temperatures compared with that in acidic solution or in air, providing further evidence in support of the silanol protection mechanism.

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Articles
Copyright
Copyright © Materials Research Society 2011

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