Chemistry of inorganic compounds – Rare earth compound
Reexamination Certificate
2006-11-28
2006-11-28
Vanoy, Timothy C. (Department: 1754)
Chemistry of inorganic compounds
Rare earth compound
C423S275000, C423S021100, C423S022000, C423S023000, C423S138000, C423S042000, C423S140000, C423S142000, C422S224000, C422S225000
Reexamination Certificate
active
07141227
ABSTRACT:
This invention provides a method for preparing cerium oxide nanoparticles with a narrow size distribution. The cerium oxide nanoparticles obtained by the method of the invention are nearly all crystalline. The method comprises providing a first aqueous solution comprising cerium nitrate and providing a second aqueous solution comprising hexamethylenetetramine. The first and second aqueous solutions are mixed to form a mixture, and the mixture is maintained at a temperature no higher than about 320° K to form nanoparticles. The nanoparticles that are formed are then separated from the mixture. A further aspect of the present invention is an apparatus for preparing cerium oxide nanoparticles. The apparatus comprises a mixing vessel having a first compartment for holding a first aqueous solution comprising cerium nitrate and a second compartment for holding a second aqueous solution comprising hexamethylenetetramine. The mixing vessel has a retractable partition separating the first and second compartments.
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Baker & Botts LLP
The Trustees of Columbia University in the City of New York
Vanoy Timothy C.
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