Functionalized nanotubes
View Patent ↗Graphitic nanotubes, which includes tubular fullerenes (commonly called “buckytubes”) and fibrils, which are functionalized by chemical substitution or by adsorption of functional moieties. More specifically the invention relates to graphitic nanotubes which are uniformly or non-uniformly substituted with chemical moieties or upon which certain cyclic compounds are adsorbed and to complex structures comprised of such functionalized fibrils linked to one another. The invention also relates to methods of introducing functional groups onto the surface of such fibrils.
1. A method of uniformly substituting the surface of carbon fibrils with a functional group comprising
chemically reacting non-oxidized carbon fibrils with an effective amount of a reactant capable of uniformly substituting surface carbon atoms with the same functional groups onto the surface of said carbon fibrils;
wherein chemically reacting comprises a reaction selected from the group consisting of sulfonation, electrophilic addition, and metallation.
2. A method of uniformly substituting the surface of carbon fibrils with a functional group as claimed in claim 1 , wherein the functional group carboxyl comprises a moiety.
3. The method of claim 1 , wherein the reaction comprises sulfonation.
4. The method of claim 3 , wherein the reactant comprises SO 3 .
5. The method of claim 1 , wherein the reaction comprises electrophilic addition.
6. The method of claim 5 , wherein the reactant is selected from the group consisting of:
CH 2 ═CHCOX where X is —OH, —Cl, —NH 2 , or —H;
maleic anhydride;
maleic acid;
cyanogen;
CH 2 ═CH—CH 2 Y where Y is —NH 2 , —OH, or -halogen;
H 2 O; and
CH 2 ═CH—CN.
7. The method of claim 5 , wherein the method comprises:
heating the carbon fibrils while purging with an inert gas; and
keeping the carbon fibrils under an inert atmosphere while cooling.
8. The method of claim 6 , wherein the method comprises:
heating the carbon fibrils while purging with an inert gas; and
keeping the carbon fibrils under an inert atmosphere while cooling.
9. The method of claim 1 , wherein the reaction comprises metallation.
10. The method of claim 9 , wherein the reactant comprises a metal selected from the group consisting of Li, Be, Mg, Al, and Tl.
11. The method of claim 9 , wherein the method comprises:
heating the carbon fibrils while purging with hydrogen gas; and
keeping the carbon fibrils under hydrogen gas while cooling.
12. The method of claim 10 , wherein the method comprises:
heating the carbon fibrils while purging with hydrogen gas; and
keeping the carbon fibrils under hydrogen gas while cooling.