Generalized syntheses of large-pore mesoporous metal oxides with semicrystalline frameworks

Peidong Yang, Dongyuan Zhao, David I. Margolese, Bradley F. Chmelka and Galen D. Stucky ()
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Peidong Yang: University of California
Dongyuan Zhao: University of California
David I. Margolese: University of California
Bradley F. Chmelka: Materials Research Laboratory, University of California
Galen D. Stucky: University of California

Nature, 1998, vol. 396, issue 6707, 152-155

Abstract: Abstract Surfactants have been shown to organize silica into a variety of mesoporous forms, through the mediation of electrostatic, hydrogen-bonding, covalent and van der Waals interactions1,2,3,4,5,6,7,8. This approach to mesostructured materials has been extended, with sporadic success, to non-silica oxides5,6,7,8,9,10,11,12,13,14,15,16,17, which might promise applications involving electron transfer or magnetic interactions. Here we report a simple and versatile procedure for the synthesis of thermally stable, ordered, large-pore (up to 140 Å) mesoporous metal oxides, including TiO2, ZrO2, Al2O3, Nb2O5, Ta2O5, WO3, HfO2, SnO2, and mixed oxides SiAlO3.5, SiTiO4, ZrTiO4, Al2TiO5 and ZrW2O8. We used amphiphilic poly(alkylene oxide) block copolymers as structure-directing agents in non-aqueous solutions for organizing the network-forming metal-oxide species, for which inorganic salts serve as precursors. Whereas the pore walls of surfactant-templated mesoporous silica1 are amorphous, our mesoporous oxides contain nanocrystalline domains within relatively thick amorphous walls. We believe that these materials are formed through a mechanism that combines block copolymer self-assembly with complexation of the inorganic species.

Date: 1998
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DOI: 10.1038/24132

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