Preparation of unagglomerated metal oxide particles with uniform

Details Preparation of unagglomerated metal oxide particles with uniform Preparation of unagglomerated metal oxide particles with uniform

1986-07-14

1988-10-18

Pal, Asok

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423608, 423598, C01G 2502

Patent

active

047786710

ABSTRACT:
Disclosed is a method for producing substantially unagglomerated submicron metal oxide particles having uniform size distribution. The process is readily adaptable to the production of multicomponent metal oxide particles. The method comprises the steps of (1) providing a solution of a complex of an oxygen-containing metal salt and a chelating agent selected from the group consisting of ethylenediaminetetraacetic acid, hydroxy ethylenediaminetetraacetic acid, nitrilotriacetic acid, diethylenetriaminepentacetic acid, glycolic acid, lactic acid, citric acid, tartaric acid, succinic acid, alkali salts of the foregoing acids, and mixtures of these; (2) drying the solution by heating the solution under alkaline conditions for a time and at a temperature sufficient to remove substantially all the solvent from the solution and to leave a solid residue; (3) heating the solid residue for time and at a temperature sufficient to convert at least a substantial portion of the residue to substantially unagglomerated particles of the metal oxide having a mean diameter up to about one micron and a uniform particle size.

REFERENCES:
patent: 2964413 (1960-12-01), Merker
patent: 3231328 (1966-01-01), Pechini
patent: 4330509 (1982-05-01), Henry
patent: 4619817 (1986-10-01), Stambaugh et al.
patent: 4664494 (1987-05-01), Suzuki et al.
"Monodispersed Metal (Hydrous) Oxides-A Fascinating Field of Colloid Science", Egon Matijevic, Acc. Chem. Res. 1981, 14, 22-29.

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