Ultrastable Mesostructured Silica Vesicles

A family of mesoporous molecular sieves (denoted MSU-G) with vesiclelike hierarchical structures and unprecedented thermal (1000°C) and hydrothermal stabilities (more than 150 hours at 100°C) associated with high SiO$_4$ crosslinking was prepared through a supramolecular assembly pathway that relies...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1998-11, Vol.282 (5392), p.1302-1305
Main Authors: Kim, Seong Su, Zhang, Wenzhong, Pinnavaia, Thomas J.
Format: Article
Language:English
Subjects:
Absorbents
Adsorption
Chemistry
Colloidal state and disperse state
Curves
Ethanol
Exact sciences and technology
General and physical chemistry
Isotherms
Molecules
Porous materials
Roasting
Silicate minerals
Surfactants
Water pressure
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Summary:A family of mesoporous molecular sieves (denoted MSU-G) with vesiclelike hierarchical structures and unprecedented thermal (1000°C) and hydrothermal stabilities (more than 150 hours at 100°C) associated with high SiO$_4$ crosslinking was prepared through a supramolecular assembly pathway that relies on hydrogen bonding between electrically neutral gemini surfactants of the type C$_n$H$_{2n+1}$NH(CH$_2$)$_2$NH$_2$ and silica precursors derived from tetraethylorthosilicate. The vesicle shells are constructed of one or more undulated silica sheets that are about 3 nanometers thick with mesopores (average diameters from 2.7 to 4.0 nanometers) running both parallel and orthogonal to the silica sheets, which makes the framework structure bicontinuous and highly accessible. Catalytic metal ion centers [for example, Ti(IV) and Al(III)] have been incorporated into the framework with the retention of hierarchical structure.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.282.5392.1302