NANOPOROUS ULTRAFINE ALPHA-ALUMINA POWDERS AND FREEZE DRYING PROCESS OF PREPARING THE SAME

摘要

ABSTRACT OF THE DISCLOSURE The present invention provides nanoporous a-alumina powders comprising powder comprising interconnected a-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 a-alumina powders comprising a-alumina particles having an average particle size of less than about 100 nm and slurries, particularly aqueous slurries, which comprise nanosized a-alumina powders of the invention. The invention further provides methods of manufacturing nanoporous a-alumina powders and nanosized a-alumina powders of the invention and methods of polishing using slurries of the invention.