580results about "Fullerenes" patented technology

The present invention relates to covalently bonded fullerene-functionalized carbon nanotubes (CBFFCNTs), a method and an apparatus for their production and to their end products. CBFFCNTs are carbon nanotubes with one or more fullerenes or fullerene based molecules covalently bonded to the nanotube surface. They are obtained by bringing one or more catalyst particles, carbon sources and reagents together in a reactor.

This invention relates generally to a fullerene nanotube composition. The fullerene nanotubes may be in the form of a felt, such as a bucky paper. Optionally, the fullerene nanotubes may be derivatized with one or more functional groups. Devices employing the fullerene nanotubes of this invention are also disclosed.

Ultradispersed ones of primary particles of nanometer-sized carbon are obtained by applying a wet-type milling method and/or a wet dispersion method to an aggregate structure of the primary particles to overcome van der Waals forces, by which forces the primary particles are held together to form the aggregate structure, whereby the ultradispersed primary particles are obtained in a colloidal dispersion on a large-scale basis at low cost without using any additive. In a method of manufacturing the ultradispersed primary particles, the wet-type milling method is carried out in a ball mill, preferably in combination with a high-energy ultrasonic-wave process carried out in a dispersing medium such as pure water, whereby a colloidal solution or slurry with a low-concentration of the primary particles ultradispersed in the dispersing medium is obtained.

Continuous process for the production of carbon-based nanotubes, nanofibres and nanostructures, comprising the following steps: generating a plasma with electrical energy, introducing a carbon precursor and/or one or more catalysers and/or carrier plasma gas in a reaction zone of an airtight high temperature resistant vessel optionally having a thermal insulation lining, vaporizing the carbon precursor in the reaction zone at a very high temperature, preferably 4000° C. and higher, guiding the carrier plasma gas, the carbon precursor vaporized and the catalyser through a nozzle, whose diameter is narrowing in the direction of the plasma gas flow, guiding the carrier plasma gas, the carbon precursor vaporized and the catalyses into a quenching zone for nucleation, growing and quenching operating with flow conditions generated by aerodynamic and electromagnetic forces, so that no significant recirculation of feedstocks or products from the quenching zone into the reaction zone occurs, controlling the gas temperature in the quenching zone between about 4000° C. in the upper part of this zone and about 50° C. in the lower part of this zone and controlling the quenching velocity between 103 K/s and 106 K/s quenching and extracting carbon-based nanotubes, nanofibres and other nanostructures from the quenching zone, separating carbon-based nanotubes, nanofibres and nanostructures from other reaction products.

Certain spin-coatable liquids and application techniques are described, which can be used to form nanotube films or fabrics of controlled properties. A spin-coatable liquid for formation of a nanotube film includes a liquid medium containing a controlled concentration of purified nanotubes, wherein the controlled concentration is sufficient to form a nanotube fabric or film of preselected density and uniformity, and wherein the spin-coatable liquid comprises less than 1×10¹⁸ atoms/cm³ of metal impurities. The spin-coatable liquid is substantially free of particle impurities having a diameter of greater than about 500 nm.

A novel fluid heat transfer agent suitable for use in a closed heat transfer system, for example, wherein energy is transferred between an evaporator and a condenser in heat exchange relationship with the heat transfer agent that is caused to flow from one to the other. The novel heat transfer agent is a complex comprising a body of heat transfer fluid, for example, ethylene glycol or water, having suspended therein carbon nanoparticles in a quantity sufficient to enhance the thermal conductivity of the body of heat transfers fluid, per se. The carbon nanoparticles are selected from carbon in the form of sp2 type and sp3 type bonding and preferably comprise nanotubes or fullerenes and may have a coupling agent bonded thereto or enclosed therein when the nanotube or fullerene forms a hollow capsule. The coupling agent may be a polar organic group covalently bonded to the carbon nanoparticles and miscible in the fluid medium.

The present invention relates to coated fullerenes comprising a layer of at least one inorganic material covering at least a portion of at least one surface of a fullerene and methods for making. The present invention further relates to composites comprising the coated fullerenes of the present invention and further comprising polymers, ceramics and/or inorganic oxides. A coated fullerene interconnect device wherein at least two fullerenes are contacting each other to form a spontaneous interconnect is also disclosed as well as methods of making. In addition, dielectric films comprising the coated fullerenes of the present invention and methods of making are further disclosed.

The present invention relates to a process of producing composite materials by a sol/gel-process, comprising carbon nanoparticles and organic polymer material. The invention further relates to composite materials, which are manufactured with the use of said sol/gel technology.

(Problem)

In conventional method for producing artificial graphite, in order to obtain a product having excellent crystallinity, it was necessary to mold a filler and a binder and then repeat impregnation, carbonization and graphitization, and since carbonization and graphitization proceeded by a solid phase reaction, a period of time of as long as 2 to 3 months was required for the production and cost was high and further, a large size structure in the shape of column and cylinder could not be produced. In addition, nanocarbon materials such as carbon nanotube, carbon nanofiber and carbon nanohorn could not be produced.

(Means to Solve)

A properly pre-baked filler is sealed in a graphite vessel and is subsequently subjected to hot isostatic pressing (HIP) treatment, thereby allowing gases such as hydrocarbon and hydrogen to be generated from the filler and precipitating vapor-phase-grown graphite around and inside the filler using the generated gases as a source material, and thereby, an integrated structure of carbide of the filler and the vapor-phase-grown graphite is produced. In addition, nanocarbon materials are produced selectively and efficiently by adding a catalyst or adjusting the HIP treating temperature.

The invention is directed to a method of forming, producing or manufacturing functionalized nanomaterials, and, specifically, soluble functionalized nanomaterials. The presently described invention also relates to nanomaterial-based composites consisting of a target material, which can include ceramic, polymer, or metallic matrices incorporated into or grown on nanomaterials, as well as a method or synthesis technique for the formation, production, or manufacture of nanomaterial-based composites through microwave-induced reaction.

The invention discloses a method for preparing a nitrogen-doped carbonaceous material by modifying polymer, which can be used for preparing the nitrogen-doped carbonaceous material with the nitrogen doping amount of 5 to 26 at%. The method disclosed by the invention is characterized by comprising the following steps of: selecting a nitrogen-containing organic compound as a nitrogen precursor and utilizing the nitrogen-containing organic compound to perform polymerization reaction on a carbonaceous material to form a compound of the nitrogen-containing polymer and carbonaceous material; and then carrying out heat treatment on the polymer/carbonaceous material compound in the inert atmosphere to carbonize nitrogen-containing polymer in the compound so as to implement the nitrogen doping on the carbonaceous material and prepare the nitrogen-doped carbonaceous material. According to the invention, when the carbonaceous material is subjected to effective nitrogen doping, the original intrinsic structure of the carbonaceous material can be ensured; moreover, the nitrogen-doped carbonaceous material with the nitrogen content of 5 to 26 at% can be prepared; the specific capacity of using a carbon material as an electrode material of a supercapacitor is obviously improved; and the method has the characteristics of simple technical process and wide applicability.

The present invention includes carbon synthesis devices and systems. The invention also includes machines and instruments using those aspects of the invention. The present invention also includes methods of carbon synthesis. The present invention includes an array of carbon nanotubes, each nanotube having a longitudinal axis. The nanotubes are placed into an array such that the longitudinal axes of all nanotubes in the array are substantially parallel. The array may be a two-dimensional array or a three-dimensional array. The present invention also includes methods of preparing such carbon molecular clusters and arrays thereof.

A method of manufacturing carbon nanotubes that is capable of growing carbon nanotubes on a substrate by a CVD method without giving rise to residual carbon impurities is provided. The method of manufacturing carbon nanotubes according to the present invention is a method in which carbon nanotubes are grown on a substrate by a chemical vapor deposition (CVD) process using a reaction gas containing a compound for the carbon source, wherein a compound having a carbon skeleton and a functional group which is effective for removing carbon impurities that deposit during the growth of carbon nanotubes is used as the compound for the carbon source.

Developed are a synthesizing method for carbon nanostructures where the generation of tar-like byproducts is reduced and carbon nanostructures are generated highly efficiently, and a unit therefor. A highly efficient material spraying type carbon nanostructure synthesizing apparatus according to the present invention is formed of a catalyst body that is placed inside a reaction tube, a heating unit that is provided in order to heat the vicinity of this catalyst body to the temperature range where carbon nanostructures are generated, a material gas supplying pipe for introducing a material gas into reaction tube which is provided in such a manner that an end of this supplying pipe is placed in proximity to catalyst body, and a preheating unit for preheating the material gas supplying pipe to a temperature range where no tar-like products are generated from a material gas. No tar-like substance is generated in the material gas supplying pipe, and the material gas is directly sprayed against the catalyst body, skipping the middle temperature range. Therefore, the probability of reaction occurring is high, and the yield in the generation of carbon nanostructures is high. Most of the material gas is consumed; thus, no tar-like substance is generated inside reaction tube.

The present invention generally provides compositions including carbon-based nanostructures, catalyst materials and systems, and related methods. In some cases, the present invention relates to carbon-based nanostructures comprising a high density of charged moieties. Methods of the invention may provide the ability to introduce a wide range of charged moieties to carbon-based nanostructures. The present invention may provide a facile and modular approach to synthesizing molecules that may be useful in various applications including sensors, catalysts, and electrodes.

A method is disclosed whereby a functional nanomaterial such as a monolayer carbon nanotube, a monolayer boron nitride nanotube, a monolayer silicon carbide nanotube, a multilayer carbon nanotube with the number of layers controlled, a multilayer boron nitride nanotube with the number of layers controlled, a multilayer silicon carbide nanotube with the number of layers controlled, a metal containing fullerene, and a metal containing fullerene with the number of layers controlled is produced at a high yield. According to the method, when a multilayer carbon nanotube (3) is formed by a chemical vapor deposition or a liquid phase growth process, an endothermic reaction aid (H₂S) is introduced in addition to a primary reactant (CH₄, H₂) in the process to form a monolayer carbon nanotube (4).

An apparatus for the synthesis of multi-component substances, comprising entities of at least two elements, molecules, grains, crystals, structural units, or phases of matter, in which the scale of the distribution of the elements, molecules, or phases of matter may range from on the order of nanometers or less, to about one millimeter, depending upon the specific materials and process conditions that are chosen. The apparatus of the present invention comprises a vacuum chamber, a target assembly, an energy source for generating a plasma containing materials ablated from the target assembly, and a reagent gas supply for directing gas into the vacuum chamber toward the plasma.

A method and apparatus for synthesis of fullerenes and nanotubes in large quantities at an economical cost from graphite in electric arc plasma process are presented. Different embodiments of channeled graphite electrodes for both direct current (DC) and alternative current (AC) processes are disclosed. High productivity of the carbon allotropes is achieved by feeding consumable graphitic electrode into hot plasma zone, injecting of feedstock, catalyst and buffer gas flow through the longitudinal inner channel electrodes into the hot plasma zone and creating the radial gas outflow in the gap between electrodes, and following removal of produced carbon and catalytic vapors from the hot plasma zone into an oxygen deprived reaction vessel for quenching and condensing. Deposited after condensation soot containing carbon allotropes is collected and carbon allotropes are recovered by known techniques. The final products of recovering are fullerenes C₆₀, C₇₀ and higher fullerenes or nanotubes.

A method for bulk separation of single-walled tubular fullerenes (100) based on helicity is provided wherein a solution or suspension of the single-walled tubular fullerenes (100) is flowed onto a crystalline or highly oriented substrate (30). The single-walled tubular fullerenes (100) that flow onto the substrate (30) have a respective longitudinal axis that is aligned with the flow direction (105). The direction of flow (105) is oriented at a predetermined angle with respect to a lattice axis (24) of the substrate (30) for energetically favoring adsorption of a respective plurality of single-walled fullerenes (100) having a tubular contour and a selected helicity. Subsequently, the adsorbed single-walled tubular fullerenes (100) of the selected chirality are removed from the substrate (30).