Block Copolymer Templating Syntheses of Mesoporous Metal Oxides with Large Ordering Lengths and Semicrystalline Framework

Autor:	Dongyuan Zhao, Galen D. Stucky, Bradley F. Chmelka, David I. Margolese, Peidong Yang
Rok vydání:	1999
Předmět:	Materials science General Chemical Engineering Oxide General Chemistry Metal chemistry.chemical_compound Crystallinity Inorganic salts Polymerization chemistry visual_art Amphiphile Polymer chemistry Materials Chemistry visual_art.visual_art_medium Copolymer Mesoporous material
Zdroj:	Chemistry of Materials. 11:2813-2826
ISSN:	1520-5002 0897-4756
Popis:	A simple and general procedure has been developed for the syntheses of ordered largepore (up to 14 nm) mesoporous metal oxides, including TiO2, ZrO2 ,N b 2O5 ,T a 2O5 ,A l 2O3, SiO2, SnO2 ,W O 3, HfO2, and mixed oxides SiAlOy ,A l 2TiOy, ZrTiOy, SiTiOy, ZrW2Oy. Amphiphilic poly(alkylene oxide) block copolymers were used as structure-directing agents in nonaqueous solutions for organizing the network-forming metal oxide species. Inorganic salts, rather than alkoxides or organic metal complexes, were used as soluble and hydrolyzable precursors to the polymerized metal oxide framework. These thermally stable mesoporous oxides have robust inorganic frameworks and thick channel walls, within which high densities of nanocrystallites can be nucleated. These novel mesoporous metal oxides are believed to be formed through a mechanism that combines block copolymer self-assembly with alkylene oxide complexation of the inorganic metal species.
Databáze:	OpenAIRE
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