Method for preparing nanoparticles comprising cerium oxide...

Details Method for preparing nanoparticles comprising cerium oxide... Method for preparing nanoparticles comprising cerium oxide...

2003-02-05

2008-11-11

Langel, Wayne (Department: 1793)

Chemistry of inorganic compounds

Rare earth compound

C423S608000, C502S304000, C502S349000

Reexamination Certificate

active

07449163

ABSTRACT:
This invention provides a method for preparing nanoparticles comprising cerium oxide and zirconium and having a narrow size distribution. The method comprises providing a first aqueous solution comprising zirconium oxychloride and providing a second aqueous solution comprising a first component which is either cerium nitrate or hexamethylenetetramine. The second aqueous solution is added to the first aqueous solution to form a first mixture. A third aqueous solution comprising a second component which is either cerium nitrate or hexamethylenetetramine, and which is different from the first component, is added to the first mixture to form a second mixture. The second mixture is maintained at a temperature no higher than about 320° K. to form nanoparticles. The nanoparticles are then separated from the second mixture and sintered in air at a temperature ranging between about 500° and about 1100° C. The nanoparticles obtained by the method of the invention are at least in part crystalline.

REFERENCES:
patent: 5316792 (1994-05-01), Harry et al.
patent: 5945575 (1999-08-01), Sigwart et al.
patent: 2002/0031470 (2002-03-01), Inagaki et al.

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