Titanium dioxide nanoparticles
View Patent ↗TiO 2 nanoparticles and methods of producing the same are provided. The nanoparticles can be processed by neutralization, calcination, and/or micronization. The TiO 2 nanoparticle size is controlled by controlling synthetic and process conditions. TiO 2 nanoparticles produced are of the anatase polymorph, of the rutile polymorph, or a mixture thereof, and have particle sizes in the range of from 10 nm to 100 nm.
1. A titanium dioxide crystalline product comprising more than 50% by weight titanium dioxide of the anatase polymorph, the product having an average particle diameter of less than 40 nm, a specific surface area of from 10 m 2 /g to 300 m 2 /g, and being produced by a method comprising:
thermally hydrolyzing an aqueous titanium oxychloride solution free of titanium dioxide nucleating agents, to form a resultant suspension;
neutralizing the resultant suspension to form a neutralized product;
filtering the neutralized product to form a filtered neutralized product; and
calcining the filtered neutralized product to form the crystalline product.
2. The titanium dioxide crystalline product of claim 1 , wherein the crystalline product exhibits a specific surface area of from 50 m 2 /g to 300 m 2 /g.
3. The titanium dioxide crystalline product of claim 1 , wherein the crystalline product exhibits a BET specific surface area of from 30 m 2 /g to 60 m 2 /g.
4. The titanium dioxide crystalline product of claim 1 , wherein the crystalline product exhibits a BET specific surface area of greater than 45 m 2 /g.
5. The titanium dioxide crystalline product of claim 1 , wherein the crystalline product comprises more than 99% titanium dioxide of the anatase polymorph.
6. The titanium dioxide crystalline product of claim 1 , wherein the crystalline product comprises 100% titanium dioxide of the anatase polymorph.
7. The titanium dioxide crystalline product of claim 1 , wherein the crystalline product comprises pure titanium dioxide of the anatase polymorph.
8. The titanium dioxide crystalline product of claim 1 , wherein the crystalline product has an average particle diameter of less than 30 nm.
9. The titanium dioxide crystalline product of claim 1 , wherein the crystalline product has an average particle diameter of from 10 nm to 30 nm.
10. The titanium dioxide crystalline product of claim 1 , wherein the crystalline product has a spherical shape.
11. A titanium dioxide crystalline product comprising more than 50% by weight titanium dioxide of the rutile polymorph, having an average particle diameter of less than 40 nm, having a surface area of from 10 m 2 /g to 100 m 2 /g, and being produced by a method comprising:
thermally hydrolyzing an aqueous titanium oxychloride solution free of titanium dioxide nucleating agents, to form a resultant suspension;
neutralizing the resultant suspension to form a neutralized product;
filtering the neutralized product to form a filtered neutralized product; and
calcining the filtered neutralized product to form the crystalline product.
12. The titanium dioxide crystalline product of claim 11 , wherein the crystalline product exhibits a specific surface area of from 20 m 2 /g to 75 m 2 /g.
13. The titanium dioxide crystalline product of claim 11 , wherein the crystalline product exhibits a BET specific surface area of from 30 m 2 /g to 60 m 2 /g.
14. The titanium dioxide crystalline product of claim 11 , wherein the crystalline product exhibits a BET specific surface area of greater than 30 m 2 /g.
15. The titanium dioxide crystalline product of claim 11 , wherein the calcined product comprises at least 98% by weight titanium dioxide of the rutile polymorph.
16. The titanium dioxide crystalline product of claim 11 , wherein the calcined product comprises more than 99.5% by weight titanium dioxide of the rutile polymorph.
17. The titanium dioxide crystalline product of claim 11 , wherein the crystalline product has an average particle diameter of less than 30 nm.
18. The titanium dioxide crystalline product of claim 11 , wherein the crystalline product has an average particle diameter of from 10 nm to 30 nm.
19. The titanium dioxide crystalline product of claim 11 , wherein the crystalline product has a spherical shape.