Preparation and Characterization of Macroporous α-Alumina

doi:10.1111/j.1151-2916.2003.tb03500.x

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Wiley InterScience

Journal of the American Ceramic Society

Volume 86 Issue 9, Pages 1481 - 1486

Published Online: 20 Dec 2004

Published on behalf of the American Ceramic Society (ACerS)

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Preparation and Characterization of Macroporous α-Alumina

Sergey Sokolov, ¹ David Bell, ¹ ^† and Andreas Stein, ¹

¹ Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455

J. Blendell—contributing editor

Supported in part by the David and Lucile Packard Foundation, the National Science Foundation (NSF) (under Grant No. DMR–9701507), the MRSEC program of the NSF (under Grant No. DMR–9809364), the U.S. Army Research Laboratory and the U.S. Army Research Office (under Grant No. DAAD 19–01–1–0512), and the Office of Naval Research (under Grant No. N00014–01–1–0810, subcontracted from NWU).

†Now with Shepherd Labs, Minneapolis, MN 55455

KEYWORDS

alumina • preparation • porous materials

ABSTRACT

α-Al₂O₃ powders with three-dimensionally ordered or randomly positioned macropores were synthesized by templating with poly(methyl methacrylate) colloidal crystals. Aluminum nitrate was precipitated with ammonium hydroxide within the interstices of the template; calcination removed the polymer and converted the inorganic precursors into a macroporous skeleton of α-Al₂O₃. Subsequent calcination at higher temperatures and hot stage transmission electron microscopy experiments were performed to study sintering effects on the product morphology. These materials combine the thermal and chemical stability of corundum with a very open structure of uniform macropores that can permit facile transport of guest molecules in potential catalysis, filtration, and sensing applications.

Manuscript No. 186532. Received November 26, 2002; approved March 17, 2003.

DIGITAL OBJECT IDENTIFIER (DOI)

10.1111/j.1151-2916.2003.tb03500.x About DOI