Nanoporous ultrafine alpha-alumina powders and freeze drying process of preparing same

摘要

The present invention provides nanoporous alpha-alumina powders comprising powder comprising interconnected alpha-alumina primary particles having an average particle size of less than about 100 nm and an interpenetrated array of pores or voids. The invention also provides nanosized alpha-alumina powders comprising alpha-alumina particles having an average particle size of less than about 100 nm and slurries, particularly aqueous slurries, which comprise nanosized alpha-alumina powders of the invention. The invention further provides methods of manufacturing nanoporous alpha-alumina powders and nanosized alpha-alumina powders of the invention and methods of polishing using slurries of the invention.