Ozone-mediated synthesis of nanostructures

Patent metadata

Field	Value
Publication number	US-11577956-B2
Application number	US-201916384829-A
Country	US
Kind code	B2
Filing date	Apr 15, 2019
Priority date	Apr 13, 2018
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

A method of producing ceria nanocrystals is provided. The method includes providing a gas that includes ozone to a solution that includes a cerium salt, and obtaining ceria nanocrystals from the solution after the gas is provided to the first solution. A method of producing nanoparticles is provided. The method includes providing a gas that includes ozone to a solution that includes a metal salt that includes at least one of a transition metal or a lanthanide, and producing at least one of metal oxide nanoparticles, metal oxynitrate nanoparticles, or metal oxyhydroxide nanoparticles from the solution after the gas is provided to the solution.

First claim

What is claimed is:

1. A method of producing ceria nanocrystals, the method comprising:
providing a gas comprising ozone to a first solution comprising a cerium salt, wherein the first solution comprises a primary alcohol; and
obtaining ceria nanocrystals from the first solution after the gas is provided to the first solution.

2. The method of claim 1 in which the gas comprises a mixture of oxygen and ozone.

3. The method of claim 1 in which the cerium salt comprises at least one of cerium (III) nitrate or cerium (III) chloride.

4. The method of claim 1 in which the gas is bubbled into the first solution.

5. The method of claim 1 , comprising causing the first solution to change from clear to yellow-orange.

6. The method of claim 5 , comprising generating a first precipitate in the first solution.

7. The method of claim 6 , comprising applying a centrifugal process to a solution that includes material from the first precipitate to produce a second precipitate.

8. The method of claim 7 in which at least a portion of the second precipitate is at least one of red or orange-red.

9. The method of claim 8 , comprising drying the second precipitate to produce the ceria nanocrystals.

10. The method of claim 6 in which at least a portion of the first precipitate is orange-red.

11. The method of claim 1 , in which the first solution consists essentially of a primary alcohol.

12. The method of claim 1 in which the first solution comprises at least one of ethanol, methanol, or 1-propanol.

13. The method of claim 1 in which providing the gas to the first solution and obtaining ceria nanocrystals from the first solution are performed at room temperature.

14. The method of claim 1 in which providing the gas to the first solution and obtaining ceria nanocrystals from the first solution are performed at a temperature in a range from 10° C. to 30° C.

15. The method of claim 1 in which at least some of the ceria nanocrystals have dimensions in a range from 2 nm to 6 nm.

16. The method of claim 1 in which the ceria nanocrystals comprise fluorite structured cerium oxide.

17. The method of claim 1 in which the ceria nanocrystals are obtained from the first solution after the gas is provided to the first solution for a duration of less than one minute.

Assignees

• Nutech Ventures

Inventors

• Cheung Chin Li
• Marin Christopher Mark
• Bhalkikar Anuja
• Fisher Tamra

Classifications

• C01F17/241

  containing two or more rare earth metals, e.g. NdPrO3 or LaNdPrO3 · CPC title

• C01P2004/51

  Particles with a specific particle size distribution · CPC title

• C01P2002/60

  Compounds characterised by their crystallite size · CPC title

• C01P2002/76

  by a space-group or by other symmetry indications · CPC title

• C01P2004/02

  obtained by optical microscopy · CPC title