摘要:
A polymer composite composed of a polymerised mixture of functionalized I carbon nanotubes and monomer which chemically reacts with the functionalized nanotubes. The carbon nanotubes are functionalized by reacting with oxidising or other chemical media through chemical reactions or physical adsorption. The reacted surface carbons of the nanotubes are further functionalized with chemical moieties that react with the surface carbons and selected monomers. The functionalized nanotubes are first dispersed in an appropriate medium such as water, alcohol or a liquefied monomer and then the mixture is polymerised. The polymerisation results in polymer chains of increasing weight bound to the surface carbons of the nanotubes. The composite may consist of some polymer chains imbedded in the composite without attachment to the nanotubes. The resulting composite yields superior chemical, physical and electrical properties over polymer composites that are only physically mixed and without binding to the surface carbons of the nanotubes.
摘要:
An electrically conductive composite comprising a polyvinylidene fluoride polymer or copolymer and carbon nanotubes is provided. Preferably, carbon nanotubes may be present in the range of about 0.5-20% by weight of the composite. The composites are prepared by dissolving the polymer in a first solvent to form a polymer solution and then adding the carbon nanotubes into the solution. The solution is mixed using an energy source such as a sonicator or a Waring blender. A precipitating component is added to precipitate out a composite comprising the polymer and the nanotubes. The composite is isolated by filtering the solution and drying the composite. The composites are also prepared by mixing or dispersing carbon nanotubes in polymer emulsion using an energy source such as a Waring blender. The liquid in the mixture is then evaporated to obtain the composite comprising the polymer and the nanotubes.
摘要:
Improved fuel compositions containing carbon nanotubes in from 0.01 % to 30.0 % by weight of fuel have improved burn rate and other valuable properties. Improved lubricant compositions containing carbon nanotubes in from 0.01 to 20.0 % by weight of lubricant have improved viscosity and other valuable properties.
摘要:
Methods of oxidizing multiwalled carbon nanotubes are provided. The multiwalled carbon nanotubes are oxidized by contacting the carbon nanotubes with gas-phase oxidizing agents such as CO2, O2, steam, N2O, NO, NO2, O3, and ClO2. Near critical and supercritical water can also be used as oxidizing agents. The multiwalled carbon nanotubes oxidized according to methods of the invention can be used to prepare rigid porous structures which can be utilized to form electrodes for fabrication of improved electrochemical capacitors.
摘要:
A supported catalyst comprising a carbon fibril aggregate and a catalytically effective amount of a catalyst supported therein, a process for performing a catalytic reaction in fluid phase using the supported catalyst and a process for making the supported catalyst are disclosed.
摘要:
The invention relates to an interpenetrating network of carbon fibrils and a polymer, which comprises a rigidized, three-dimensional macroscopic assemblage of a multiplicity of randomly oriented carbon fibrils and an interpenetrating mass of an organic polymer. The invention also relates to methods of making and using such interpenetrating networks.
摘要:
The present invention relates to a a continuous process for producing carbon fibrils by decomposing a source of carbon at elevated temperatures in contact with a multivalent metal and recovering the fibrils formed thereby comprising the steps of introducing catalyst particles having a size of up to 400 µm (microns) and comprising at least one multivalent transition metal on a particulate substrate into a reactor heated to a temperature of 500°C to 1500°C, and recovering the fibrils formed thereby wherein said metal is present on said substrate as a multiplicity of discontinuous catalytic sites which, at least during fibril formation, have a size of 3,5 to 70 nm (35 to 700 Å) which size is measured by measuring the size of the transition metal particles recovered along with produced fibrils. This invention also relates to a reaction apparatus to be used for carrying out said process.
摘要:
A high surface area nanofiber is disclosed. The nanofiber has a coating which contains pores sufficient to increase the effective surface area of the nanofiber. Generally, the high surface area layer is formed by pyrolysis of a coated polymer. Carbon nanofibers are preferred.
摘要:
A white or colored electrically conductive polymer composition is provided using carbon fiber. The composition comprises a moldable organic polymer dispersed therein (a) at least 0.01 wt.% and less than 2 wt.% of hollow carbon microfibers having an outer diameter of 3.5 - 70 nm and an aspect ratio of at least 5, (b) 2.5 - 40 wt.% of an electrically conductive white powder (such as TiO2 powder coated with antimony-doped tin oxide, or aluminum-doped zinc oxide powder), and optionally (c) a colorant for coloration.
摘要:
A polymeric composition having improved toughness and conductivity comprising carbon fibrils, at least a portion of which are in the form of aggregates, wherein, as measured on an area basis, substantially all of the aggregates are less than about 35νm in diameter. A polymeric composition having improved toughness and conductivity is prepared by combining carbon fibrils, at least a portion of which are in the form of aggregates, with a polymeric material, mixing the combination to distribute the fibrils in the polymeric material and applying shear to the combination to break down the aggregates until substantially all of the aggregates are less than about 35νm in diameter.