Abstract:
Methods of producing stable disperions of single-walled carbon nanotube structures in solutions are achieved utilizing dispersal agents. The dispersal agents are effective in substantially solubilizing and dispersing single-walled carbon nanotube structures in aqueous solutions by coating the structures and increasing the surface interaction between the structures and water. Exemplary agents suitable for dispersing nanotube structures in aqueous solutions include synthetic and natural detergents having high surfactant properties, deoxycholates, cyclodextrins, chaotropic salts and ion pairing agents. The dispersed nanotube structures may further be deposited on a suitable surface in isolated and individualized form to facilitate easy characterization and further processing of the structures.
Abstract:
Provided is a process for preparing a composition comprising semiconducting single-walled carbon nanotubes, a semiconducting polymer and solvent A (composition A), which process comprises the step of separating composition A from a composition comprising semiconducting and metallic single-walled carbon nanotubes, the semiconducting polymer and solvent B(composition B), wherein the semiconducting polymer has a band gap in the range of 0.5 to 1.8 eV and solvent A and B comprise an aromatic or a heteroaromatic solvent, composition A itself, a process for forming an electronic device, which process comprises the step of forming a layer by applying composition A to a precursor of the electronic device, as well as the electronic device obtainable by this process.
Abstract:
The separation of single-walled carbon nanotubes (SWCNTs), by electronic type, using centrifugation of compositions of SWCNTs and surface active block copolymers in self-forming density gradient media.
Abstract:
The disclosure provides methods for separating metallic from semiconducting single-walled carbon nanotubes by a) subjecting a mixture of metallic and semiconducting single walled nanotubes and chondroitin sulfate (CS) in an electrophoresis gel matrix to uniform electric field (electrophoresis); and b) isolating the separated metallic and semiconducting single-walled carbon nanotubes.
Abstract:
The separation of single-walled carbon nanotubes (SWNTs), by electronic type using centrifugation of compositions of SWNTs and surface active block copolymers in density gradient media.
Abstract:
The present invention relates an apparatus to separate carbon nanotubes by their electrical conductivity. Known production processes for single-walled carbon nanotubes produce a mixture of nanotubes with metallic and semiconductive electrical conductivities. Some potential applications require one conductivity or the other. The mixture may be undesirable. Carbon nanotubes of varying electrical conductivity may be separated by hybridizing the nanotubes with nucleic acids such as DNA and then passing a dispersion of the hybrids through an electrochemical cell with an electrical potential on the working electrode which absorbs or desorbs nanotubes of a desired electrical conductivity.