Fibrous composites comprising carbon nanotubes and silica
View Patent ↗Fibrous composite comprising a plurality of carbon nanotubes; and a silica-containing moiety having one of the structures: (SiO) 3 Si—(CH 2 ) n —NR 1 R 2 ) or (SiO) 3 Si—(CH 2 ) n —NCO; where n is from 1 to 6, and R 1 and R 2 are each independently H, CH 3 , or C 2 H 5 .
1. A fibrous composite comprising:
a. a plurality of carbon nanotubes; and
b. a silica-containing moiety having one of the structures:
i. (SiO) 3 Si—(CH 2 ) n —NR 1 R 2 ; or
ii. (SiO) 3 Si—(CH 2 ) n —NCO);
where n is from 1 to 6, and R 1 and R 2 are each independently H, CH 3 , or C 2 H 5 .
2. The fibrous composite of claim 1 , wherein the composite is a semiconductor.
3. The fibrous composite of claim 1 , wherein the composite has an average diameter of from about 5 μm to about 20 μm.
4. The fibrous composite of claim 1 , wherein the composite has a tensile strength of at least 0.3 GPa.
5. The fibrous composite of claim 1 , wherein the composite has an electrical conductivity of at least 100 S/cm at room temperature.
6. The fibrous composite of claim 1 , wherein composite has a weight percentage of silica of from about 0.1% to about 10%.
7. The fibrous composite of claim 1 , wherein n is 3.
8. The fibrous composite of claim 1 , wherein R 1 and R 2 are each H.
9. The fibrous composite of claim 1 , wherein said carbon nanotube comprises a —COOH moiety which is hydrogen bonded to the silica-containing moiety to form [(SiO) 3 Si—(CH 2 ) n —NR 1 R 2 ]—HOOC, where n is from 1 to 6, and R 1 and R 2 are each independently H, CH 3 , or C 2 H 5 .
10. The fibrous composite of claim 8 , wherein the carbon nanotube comprises a —COOH moiety which is hydrogen bonded to the silica-containing moiety to form (SiO) 3 Si—(CH 2 ) n —NH 2 —HOOC, where n is from 1 to 6.
11. The fibrous composite of claim 9 , wherein n=3.
12. The fibrous composite of claim 9 , wherein the tensile strength is from about 0.3 GPa to about 5.0 GPa.
13. The fibrous composite of claim 10 , wherein n=3.
14. The fibrous composite of claim 1 , wherein the plurality of carbon nanotubes is substantially aligned.
15. A fibrous composite comprising:
a. a plurality of carbon nanotubes; and
b. a silica-containing compound having the structure
(SiO) 3 Si—(CH 2 ) 3 —NH 2 .
16. The fibrous composite of claim 15 , wherein the carbon nanotube comprises a —COOH moiety which is hydrogen bonded to the silica-containing moiety to form [(SiO) 3 Si—(CH 2 ) 3 —NH 2 ]—HOOC.
17. The fibrous composite of claim 15 , wherein the composite has a tensile strength of at least about 0.3 GPa.
18. The fibrous composite of claim 16 , wherein the composite has a tensile strength of from about 0.3 GPa to about 5.0 GPa.
19. A fibrous composite comprising:
a. a plurality of carbon nanotubes; and
b. a silica-containing compound having the structure
(—SiO) 3 —Si—(CH 2 ) 3 —N═CO.
20. The fibrous composite of claim 19 , wherein the composite has a tensile strength of from about 0.3 GPa to about 0.5 GPa.