A mixture of carbon nanotubes is separated into fractions that are enriched with a desired chirality by exposing a solution or suspension of the carbon nanotubes to a separation medium. A portion of the mixture forms complexes with, and becomes attached to, the separation medium. Exposure to other reagents results in dissociation of the complexes and release of the nanotubes from the separation medium.
STATEMENT REGARDING FEDERAL RIGHTS
 This invention was made with government support under Contract No. DE-AC51-06NA25396 awarded by the U.S. Department of Energy. The government has certain rights in the invention.