METHOD OF OBTAINING STABILISED WATER SOL OF NANOCRYSTALLINE CERIUM DIOXIDE, DOPED WITH GADOLINIUM

摘要

FIELD: chemistry.;SUBSTANCE: invention relates to technologies of nanomaterials production for obtaining of oxide fuel elements, thin coatings, films, which have high ionic conductivity. Method includes preparation of water solution of cerium and gadolinium salts, in which total concentration of rare earth elements constitutes 0.005÷0.02 mole per litre of water, and molar ratio of Ce:Gd constitutes from 19:1 to 4:1, addition of anion-exchange resin in OH-form to obtained solution until pH 9.0÷10.0 is reached, separation of formed colloidal solution from anion-exchange resin by filtering, hydrothermal processing at 120÷210°C for 1.5÷4 h and cooling to room temperature. Obtained unstable sol of nanocrystalline cerium dioxide, doped with gadolinium, is additionally stabilised with salt of polybasic acid (citric or polyacrylic) with molar ratio of rare earth elements in acid, equal 1:1÷4, and following slow drop-by-drop addition of ammonia water solution until pH 7÷8 is obtained.;EFFECT: invention makes it possible to obtain aggregative-stable water sols with average diameter approximately 4 nm, which have high morphological homogeneity, preserving their properties for long time.;5 cl, 4 dwg, 4 ex