High surface area ceramic coated fibers
View Patent ↗A method of manufacturing a ceramic coated fiber comprises heat treating an activated carbon coated fiber containing a ceramic precursor, to form a ceramic coated fiber.
1. A method of manufacturing a ceramic coated fiber, the method comprising:
infiltrating an activated carbon coated fiber with a ceramic precursor, the infiltration being carried out at room temperature and comprising immersing the activated carbon coated fiber in a solution comprising the ceramic precursor in a volatile solvent;
after the infiltrating, removing an excess of the ceramic precursor by washing with ethanol; and
after the removing, heat treating the activated carbon coated fiber containing the ceramic precursor to form a ceramic coated fiber.
2. The method of claim 1 , wherein the heat treating comprises:
a first heating at a first temperature of at least 250 ° C., to cure the ceramic precursor, and
a second heating at a second temperature of at least 400° C. in an oxidizing atmosphere to remove the carbon.
3. The method of claim 2 , wherein the first heating is in an inert atmosphere.
4. The method of claim 2 , wherein the ceramic comprises TiO 2 and/or TiON having an anatase structure.
5. The method of claim 4 , wherein the ceramic precursor further comprises a nitrogen or sulfur dopant.
6. The method of claim 5 , wherein the nitrogen source is tetramethylammonium hydroxide.
7. The method of claim 2 , further comprising:
contacting the ceramic coated fiber with a compound containing silver; and a third heating of the ceramic coated fiber.
8. The method of claim 2 , further comprising:
contacting the ceramic coated fiber with a compound containing palladium;
a third heating of the ceramic coated fiber; and
a fourth heating of the ceramic coated fiber in an atmosphere comprising H 2 .
9. The method of claim 2 , wherein the ceramic comprises crystalline ceramic and has a BET surface area of at least 50 m 2 /g.
10. The method of claim 2 , wherein the ceramic comprises at least one member selected from the group consisting of TiO 2 , TiON, TiOS, Al 2 O 3 , ZrO 2 , and MgO.
11. The method of claim 2 , where the oxidizing atmosphere is pure O 2 .
12. The method of claim 2 , where the oxidizing atmosphere is air.
13. The method of claim 2 , where the first temperature is from 250° C. to 600° C.
14. The method of claim 13 , where the first temperature is from 250° C. to 400° C.
15. The method of claim 2 , wherein the second temperature is from 400° C. to 1000° C.
16. The method of claim 1 , further comprising, prior to the heat treating, hydrolyzing the ceramic precursor.
17. The method of claim 16 , where hydrolyzing the ceramic precursor comprises exposing the ceramic precursor to air moisture.
18. A method for manufacturing an intermediate for the fabrication of ceramic coated fibers, the method comprising
infiltrating an activated carbon coated fiber with a ceramic precursor, the infiltration being carried out at room temperature and comprising immersing the activated carbon coated fiber in a solution comprising the ceramic precursor in a volatile solvent;
after the infiltrating, removing an excess of the ceramic precursor by washing with ethanol; and
after the removing, heating the activated carbon coated fiber containing the ceramic precursor to cure the precursor.