METHOD OF PRODUCING STABLE AQUEOUS COLLOIDAL SOLUTIONS OF CERIUM DIOXIDE NANOPARTICELS Russian patent published in 2017 - IPC C01F17/00 B01J13/00 B82B3/00 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: ammoniumhexanitrocerate (IV) aqueous solution is prepared to produce stable aqueous cooloidal solutions of cerium dioxide nanoparticles, by intimately stirring it until complete dissolution. Hydrothermal treatment of the solution is carried out at a temperature of 80-200°C during 0.4-50 hours. The precipitate of cerium dioxide nanoparticles is separated by centrifugation from the mother liquor containing NH₄NO₃ and HNO₃. Nanoparticles of CeO₂ are redispersed in distilled water. The resulting colloidal solution is added to the aqueous solution of stabiliser. Nontoxic organic hydroxyl compounds selected from the series: dextran, maltodextrin, ammonium citrate are used as the stabiliser. The molar ratio of CeO₂: stabiliser equals 1:(2-5). If dextran and maltodextrin are used as the stabilisers, calculation is made per monomer material amount.

EFFECT: invention enables to obtain aqueous colloidal solutions, stable in a wide pH range.

4 cl, 2 dwg, 4 ex