Aluminum oxide powders
OwnerShivkumar Chiruvolu, Yu K. Fortunakinventors
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Abstract
Collections of particles are described that include crystalline aluminum oxide selected from the group consisting of delta-Al2O3 and theta-Al2O3. The particles have an average diameter less than about 100 nm. The particles generally have correspondingly large BET surface areas. In certain embodiments, the particle collections are very uniform. In some embodiments, collections of particles include doped aluminum oxides particles with an average diameter less than about 500 nm. The collections of particles can be deposited as coatings. Methods are described for producing desired aluminum oxide particles.
Claims35
A collection of particles comprising crystalline aluminum oxide selected from the group consisting of delta-Al2O3 and theta-Al2O3, the particles having an average diameter less than about 100 nm.
A collection of particles comprising doped aluminum oxides, the particles having an average diameter less than about 500 nm.
A method for the production of doped aluminum oxide particles, the method comprising reacting a flowing reactant stream comprising an aluminum precursor, an oxygen source and a dopant precursor to form doped aluminum oxide particles in a flowing product stream.
A method for producing product submicron crystalline-aluminum oxide particles, the method comprising heating a collection of precursor submicron carbon-coated aluminum oxide particles in a reducing environment to convert the crystal structure of the aluminum oxide particles to produce product crystalline-aluminum oxide particles, wherein the product crystalline aluminum oxide particles comprise particles with a different crystal structure than the precursor aluminum oxide particles.
Dependencies are inferred from the claim text.