Patent ID: 8691178
Filing Date: 2014-04-08
Classification: B82Y,C01B

Abstract:
1. A method of processing carbon nanotubes (CNTs) that include individual CNTs and bundles of CNTs, comprising the steps of: (a) carrying out a first processing step that at least partially separates individual metallic CNTs from individual semiconducting CNTs; and (b) carrying out a second processing step that at least partially separates one or more bundles of CNTs from individual metallic and/or semiconducting CNTs; the method further comprising, prior to steps (a) and (b), the steps of: at least partially unbundling some of the bundles of CNTs into individual CNTs and dispersing the individual CNTs and remaining bundles of CNTs in a solution using one or more surfactants to thereby provide the individual metallic CNTs, the individual semiconducting CNTs, and the one or more bundles of CNTs; and replacing at least one of the one or more surfactants with a different surfactant, wherein the replacing step further comprises removing an antifoam agent or dispersion assisting compound from the solution using dialysis.