Title:
METHOD FOR PREPARING NANOPARTICLES COMPRISING CERIUM OXIDE AND ZIRCONIUM
Document Type and Number:
WIPO Patent Application WO2004005183
Kind Code:
A3
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.
Inventors:
CHAN SIU-WAI (US)
ZHANG FENG (US)
ZHANG FENG (US)
Application Number:
PCT/US2003/003393
Publication Date:
April 01, 2004
Filing Date:
February 05, 2003
Export Citation:
Assignee:
UNIV COLUMBIA (US)
CHAN SIU-WAI (US)
ZHANG FENG (US)
CHAN SIU-WAI (US)
ZHANG FENG (US)
International Classes:
B01J23/10; C01F17/235; C01G25/00; C04B35/50; (IPC1-7): C01F17/00; C01G25/00
Foreign References:
| US5945575A | 1999-08-31 | |||
| US20020031470A1 | 2002-03-14 |
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