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1069results about "Artificial filament chemical after-treatment" patented technology

Methods of chemically derivatizing single-wall carbon nanotubes

This invention is directed to making chemical derivatives of carbon nanotubes and to uses for the derivatized nanotubes, including making arrays as a basis for synthesis of carbon fibers. In one embodiment, this invention also provides a method for preparing single wall carbon nanotubes having substituents attached to the side wall of the nanotube by reacting single wall carbon nanotubes with fluorine gas and recovering fluorine derivatized carbon nanotubes, then reacting fluorine derivatized carbon nanotubes with a nucleophile. Some of the fluorine substituents are replaced by nucleophilic substitution. If desired, the remaining fluorine can be completely or partially eliminated to produce single wall carbon nanotubes having substituents attached to the side wall of the nanotube. The substituents will, of course, be dependent on the nucleophile, and preferred nucleophiles include alkyl lithium species such as methyl lithium. Alternatively, fluorine may be fully or partially removed from fluorine derivatized carbon nanotubes by reacting the fluorine derivatized carbon nanotubes with various amounts of hydrazine, substituted hydrazine or alkyl amine. The present invention also provides seed materials for growth of single wall carbon nanotubes comprising a plurality of single wall carbon nanotubes or short tubular molecules having a catalyst precursor moiety covalently bound or physisorbed on the outer surface of the sidewall to provide the optimum metal cluster size under conditions that result in migration of the metal moiety to the tube end.
Owner:RICE UNIV

Chemically modifying single wall carbon nanotubes to facilitate dispersal in solvents

This invention is directed to making chemical derivatives of carbon nanotubes and to uses for the derivatized nanotubes, including making arrays as a basis for synthesis of carbon fibers. In one embodiment, this invention also provides a method for preparing single wall carbon nanotubes having substituents attached to the side wall of the nanotube by reacting single wall carbon nanotubes with fluorine gas and recovering fluorine derivatized carbon nanotubes, then reacting fluorine derivatized carbon nanotubes with a nucleophile. Some of the fluorine substituents are replaced by nucleophilic substitution. If desired, the remaining fluorine can be completely or partially eliminated to produce single wall carbon nanotubes having substituents attached to the side wall of the nanotube. The substituents will, of course, be dependent on the nucleophile, and preferred nucleophiles include alkyl lithium species such as methyl lithium. Alternatively, fluorine may be fully or partially removed from fluorine derivatized carbon nanotubes by reacting the fluorine derivatized carbon nanotubes with various amounts of hydrazine, substituted hydrazine or alkyl amine. The present invention also provides seed materials for growth of single wall carbon nanotubes comprising a plurality of single wall carbon nanotubes or short tubular molecules having a catalyst precursor moiety covalently bound or physisorbed on the outer surface of the sidewall to provide the optimum metal cluster size under conditions that result in migration of the metal moiety to the tube end.
Owner:RICE UNIV

Modification of nanotubes oxidation with peroxygen compounds

A method of chemically modifying carbon nanotubes having a diameter less than one micron comprising: contacting the nanotubes with a peroxygen compound selected from the group consisting of organic peroxyacids, inorganic peroxoacids and organic hydroperoxides, or a salt thereof, under oxidation conditions and thereby producing modified carbon nanotubes. Oxidation of the nanotubes increases the degree of dispersion of aggregates of nanotubes and aids in the disassembling of such aggregates. The dispersed nanotubes are used to prepare rigid structures and can be used in electrodes and capacitors.
Owner:HYPERION CATALYSIS INT

Preparation method for high strength macro graphene conductive fiber

The invention discloses a preparation method for high strength macro graphene conductive fiber. According to the method, graphite is oxidized to obtain a graphene oxide; the graphene oxide is dispersed in water or a polar organic solvent to prepare a spinning liquid sol with the mass concentration of 1-20%; the spinning liquid sol is transferred to a spinning device; the spinning liquid is continuously extruded from a spinning head capillary at a uniform speed; the extruded spinning liquid enters a solidification liquid; the solidified primary fiber is collected by using a polytetrafluoroethylene roller; a drying treatment is performed to obtain the graphene oxide fiber; the graphene oxide fiber is subjected to chemical reduction to obtain the graphene fiber. According to the present invention, the spinning process is simple; the operation is performed at the room temperature; no strong corrosive reagent is used; the process has the characteristics of green environmental protection; the prepared graphene fiber has characteristics of good conductivity, excellent mechanical property and good toughness, can be woven into the pure graphene fiber cloth, can further be woven into various fabrics with other fibers, and can further be added to the polymer as the conduction enhancing additive and the like; the prepared graphene fiber can replace the carbon fiber to use in a plurality of fields.
Owner:杭州德烯科技集团有限公司

High tensile strength carbon nanotube film and process for making the same

A conductive carbon nanotube film having high tensile strength and initial tensile modulus comprises primarily oxidized small-diameter carbon nanotubes wherein the diameter of the small-diameter carbon nanotubes are at most about 3 nm. A method for making the film comprises refluxing an aqueous mixture comprising carbon nanotubes and an oxidizing agent to form a refluxed nanotube dispersion; forming a carbon nanotube film from the refluxed carbon nanotube dispersion; optionally removing nitric acid or other oxidizing agent from the carbon nanotube film; drying the carbon nanotube film; and heat-treating the carbon nanotube film to form a heat-treated carbon nanotube film. The method can also comprise sonicating the nanotubes prior to or after refluxing. A heat-treated small-diameter carbon nanotube film can have a tensile strength of over 70 MPa and an initial tensile modulus of about 5 GPa.
Owner:GEORGIA TECH RES CORP
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