METHOD OF PRODUCING CRYSTALLINE NANOPOWDERS OF METAL OXIDES USING CRYOTREATMENT OF AQUEOUS-ORGANIC SOLS Russian patent published in 2016 - IPC C01G53/04 C01G49/02 C01F17/00 B82Y40/00 B82B3/00 B22F9/24 

FIELD: metallurgy.

SUBSTANCE: invention relates to a method of producing crystalline nanopowders of metals with the size of crystallites of less than ≤ 10 nm and can be used in chemical industry, for production of intermediate products for fine ceramic materials. Synthesis is carried out in a water-organic medium using as sources of metal nitrates, chlorides or acetates. For formation and stabilization of sol used are acetylacetone-alcoholic solutions of N,N-dimethyloctylamine, hexamethylene tetramine or monoethanolamine. As a complexing agent used is acetylacetone. Obtained sol through a jet nozzle is dispersed into liquid nitrogen, where at the cooling rate > 30° cryogranulating takes place. Produced granules are subjected to vacuum-sublimation drying to form a cryo-airgel, which is then annealed at 500 °C in air for 3 hours.

EFFECT: proposed method provides technologically effective and environmentally acceptable method of producing nanocrystalline of metal oxides.

4 cl, 8 dwg, 1 tbl, 6 ex