Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 195, Issue -, Pages 161-166Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2014.04.027
Keywords
Mechanical stability; Hydrothermal stability; Mesoporous silica; Mesoporous carbon; Nanocomposite material
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Funding
- U.S. Department of Energy, Office of Science [DE-SG0001057]
- NSF [DMR-0936384]
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In situ SAXS measurements were made on periodic mesoporous carbon and silica-based materials as a function of pressure and temperature and in water to supercritical conditions. Our data show that periodic mesoporous silica-based materials exhibit substantial mechanical strength. The pore structure, size and related mesoscale properties appear to directly impact the mechanical response of silica-based materials to high pressures and temperatures. Our results indicate that hydrolysis does not seem to be responsible for the mechanical collapse of the pore structure of silica-based mesoporous materials under high pressure conditions. SBA-15 type mesoporous carbon exhibits excellent hydrothermal stability under extreme conditions. The mesostructure of FDU-12 silica is irreversibly disordered after extreme hydrothermal exposure in a manner consistent with H2O dissociation reactions causing topological alteration of the silicate network. (C) 2014 Elsevier Inc. All rights reserved.
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