CERIUM-CONTAINING NANOPARTICLES

摘要

A process for making cerium-containing oxide nanoparticles includes providing an aqueous reaction mixture containing a source of cerous ion, optionally a source of one or more metal ions (M) other than cerium, a source of hydroxide ion, at least one monoether carboxylic acid nanoparticle stabilizer wherein the molar ratio of said monoether carboxylic acid nanoparticle stabilizers to total metal ions is greater than 0.2, and an oxidant. The cerous ion is oxidized to ceric ion, thereby forming a product dispersion of cerium-containing oxide nanoparticles, optionally containing one or more metal ions (M), Ce1-xMxO2-δ, wherein x has a value from about 0.001 to about 0.95 and δ has a value of about 0.0 to about 0.5. The nanoparticles may have a mean hydrodynamic diameter from about 1 nm to about 50 nm, and a geometric diameter of less than about 45 nm.

主权项

1. A method for making a dispersion of cerium oxide nanoparticles that include at least one other metal, comprising:
a) forming an aqueous reaction mixture comprising:
i) a source of cerous ion and a source of one or more metal ions other than cerium;ii) a source of hydroxide ion;iii) at least one monoether carboxylic acid, wherein the molar ratio of said monoether carboxylic acid to total metal ions is greater than 0.2; andiv) an oxidant; b) oxidizing the cerous ion to ceric ion; and c) thereby forming in the reaction mixture a dispersion of metal-containing cerium oxide nanoparticles, Ce1-xMxO2-δ, wherein x has a value from about 0.001 to about 0.95; M represents said at least one other metal, and δ has a value of about 0.0 to about 0.5.