Titania Nanocavities and Method of Making
First Claim
1. A composition comprising a plurality of metal oxide nanoparticles having regular polyhedral nanocavities, said nanocavities being isolated from the surface of said nanoparticle
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Abstract
Disclosed herein are compositions of metal oxide nanoparticles having regular polyhedral nanocavities, where the metal oxide can be titania, and where the nanoparticles be nanorods. Also disclosed are titania nanoparticles with nanocavities that are doped with dopants. Methods of making metal oxide nanoparticles with nanocavities are also disclosed. Also disclosed are ultraviolet-blocking compositions including metal oxide nanoparticles with nanocavities, as well as methods of enhancing ultraviolet absorbance efficiency of an ultraviolet blocking composition. Additional uses of metal oxide nanoparticles with nanocavities include solar energy conversion systems and lithium-ion batteries.
21 Citations
18 Claims
- 1. A composition comprising a plurality of metal oxide nanoparticles having regular polyhedral nanocavities, said nanocavities being isolated from the surface of said nanoparticle
- 7. An ultraviolet-blocking composition comprising a metal oxide nanoparticle having regular polyhedral nanocavities and a cosmetically-acceptable carrier or an industrially-acceptable carrier, said nanocavities being isolated from the surface of said nanoparticle.
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12. A method for producing a plurality of metal oxide nanoparticles having regular polyhedral nanocavities comprising treating a powder of the oxide with an alkali solution in an autoclave at a temperature of from about 150°
- C. to about 190°
C., washing the alkali-treated product with an acidic solution having from about 1% to about 15% by weight of a mineral acid, and heating the washed product at a temperature of from about 550°
C. to about 750°
C. in an atmosphere comprising oxygen or ammonia. - View Dependent Claims (13, 14, 15, 16, 17, 18)
- C. to about 190°
Specification