Method of preparing cerium dioxide nanoparticles

US9993803B2 · kind B2 · utility

Assignee

• Cerion, LLC · US

Inventors

• Albert Gary DiFrancesco · Rochester, US
• Richard K. Hailstone · North Chili, US
• Andreas Langner · Alzenau, DE
• Kenneth J. Reed · Brighton, US

Key dates

• Filing date: Sep 4, 2007
• Grant date: Jun 12, 2018
• Expiry date: Apr 6, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T50/678
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A method of making cerium dioxide nanoparticles includes: a) providing an aqueous reaction mixture having a source of cerous ion, a source of hydroxide ion, a nanoparticle stabilizer, and an oxidant at an initial temperature no higher than about 20° C.; b) mechanically shearing the mixture and causing it to pass through a perforated screen, thereby forming a suspension of cerium hydroxide nanoparticles; and c) raising the initial temperature to achieve oxidation of cerous ion to eerie ion and thereby form cerium dioxide nanoparticles having a mean diameter in the range of about 1 nm to about 15 nm. The cerium dioxide nanoparticles may be formed in a continuous process.