Post nanoporosos ultrafine alpha - alumina and preparation process thereof by drying the same by freezing drying

摘要

"Post nanoporosos ultrafine alpha - alumina and process for preparing the same through drying by freezing.The present invention provides post nanoporosos 244 - alumina containing primary particles of 244 - alumina having an average particle size less than about 100 nm, and an arrangement interpenetradThe pores or voids.The invention also provides post nanomu00e9tricos 244 - alumina containing particles of 244 - alumina having an average particle size less than about 100 nm and sludges.Particularly aqueous sludges, which contain the post nanomu00e9tricos 244 - alumina of the invention.The invention also provides manufacturing methods of post nanoporosos 244 - alumina and post nanomu00e9tricos 244 - alumina of the invention and methods of polishing using the sludge of the invention.