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OwnerXiao-Dong Zhou, Wayne Huebner +1inventors
InventorsXiao-Dong Zhou, Wayne Huebner, Harlan Anderson
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The invention comprises novel undoped and doped nanometer-scale CeO2 particles as well as a novel semi-batch reactor method for directly synthesizing the novel particles at room temperature. The powders exhibited a surface area of approximately 170 m2/g with a particle size of about 3-5 nm, and are formed of single crystal particles that are of uniform size and shape. The particles' surface area could be decreased down to 5 m2/g, which corresponds to a particle size of 100 nm, by thermal annealing at temperatures up to 1000° C. Control over the particle size, size distribution and state of agglomeration could be achieved through variation of the mixing conditions such as the feeding method, stirrer rate, amount of O2 gas that is bubbled through the reactor, the temperature the reaction is carried out at, as well as heating the final product at temperatures ranging from 150° to 1000° C.
A process for the production of cerium dioxide crystals comprising:
A cerium dioxide composition comprising single crystal cerium dioxide particles that are smaller than 100 nanometers in size.
A doped cerium dioxide composition comprising cerium dioxide particles that are doped with a lanthanide series metal and have a particle size less than 100 nanometers.
A cerium dioxide composition comprising cerium dioxide particles having a predominant particle size within the range of 3 to 100 nanometers produced by the process of:
A cerium dioxide composition comprising single crystal cerium dioxide particles that are smaller than 100 nanometers in size.
A doped cerium dioxide composition comprising cerium dioxide particles that are doped with a lanthanide series metal and have a particle size less than 100 nanometers.
A cerium dioxide composition comprising doped cerium dioxide particles having a predominant particle size within the range of 3 to 100 nanometers produced by the process of:
Dependencies are inferred from the claim text.