76results about "Multi-walled nanotubes" patented technology

A carbon nanotube assembled wire includes a plurality of carbon nanotubes, wherein the plurality of carbon nanotubes include a plurality of nitrogen-doped single-walled carbon nanotubes, a content ratio of nitrogen in the carbon nanotube assembled wire is 0.5 atomic % or more and 6 atomic % or less, and a content ratio of graphitic nitrogen in the carbon nanotube assembled wire is 0.4 atomic % or more and 3.5 atomic % or less.

To provide a manufacturing method of a conductive material slurry which facilitates pre-dispersion by reducing a particle size of a conductive material by introduction of a dry process, produces a high-concentration dispersion, and has excellent dispersion characteristics by introduction of a post-process, as compared with a conventional manufacturing method of a conductive material slurry.SOLUTION: A method of preparing a conductive material dispersed slurry includes: dry-grinding a conductive material; pre-dispersing the conductive material by mixing the conductive material with a solvent and a dispersant; main-dispersing the pre-dispersed conductive material; and post-dispersing the main-dispersed mixture.SELECTED DRAWING: Figure 1

The present invention relates to an iron-free supported catalyst for the selective conversion of hydrocarbons to carbon nanotubes, said catalyst comprising cobalt and vanadium as active catalytic metals in any oxidation state on a catalyst support comprising aluminum oxide hydroxide, wherein the mass ratio of cobalt to vanadium is between 2 and 15, and the mass ratio of cobalt to aluminum is between 5.8 and 10. -2 ~5.8 10 -1 and - the mass ratio of vanadium to aluminum is 5.8 10 -3 ~8.7 10 -2 The present invention also relates to a method for producing said iron-free supported catalyst and a method for producing carbon nanotubes using said iron-free supported catalyst.

Provided are a multiwalled carbon nanotube assembly having high conductivity and good dispersibility in a dispersion medium, a multiwalled carbon nanotube dispersion liquid, a conductive material, an electrode, a secondary battery, a planar assembly, a filter, an electromagnetic shield, and an extreme ultraviolet protective film. A multi-walled carbon nanotube assembly, a multi-walled carbon nanotube dispersion, a conductive material, an electrode, a secondary battery, a planar assembly, a filter, an electromagnetic shield, and an extreme ultraviolet protective film, wherein the multi-walled carbon nanotube assembly contains Fe atoms and multi-walled carbon nanotubes having a maximum length of 1000-30000 [mu] m, and the Fe atom content ratio relative to the total mass of the assembly is 0.5 mass% or more but less than 10 mass%. The invention also provides a multi-walled carbon nanotube dispersion, a conductive material, an electrode, a secondary battery, a planar assembly, a filter, an electromagnetic shield, and an extreme ultraviolet protective film.

The application provides an in-situ oriented carbon nanotube / silicon nitride nanobelt composite material and a preparation method thereof, and comprises the following steps: uniformly mixing methyltrimethoxysilane, dimethyldimethoxysilane, ethanol, water and nitric acid according to a certain proportion, and obtaining a siloxane xerogel precursor after stirring and drying; obtaining a silicon nitride nanomaterial by a carbothermal reduction reaction method under high-temperature conditions; injecting a mixed solution of ethanol, ethylenediamine and ferrocene into a tube furnace by a floating CVD method under high-temperature conditions, and growing carbon nanotubes on the surface of the silicon nitride nanobelt to obtain the in-situ oriented carbon nanotube / silicon nitride nanobelt composite material; and the application grows the carbon nanotubes on the surface of the silicon nitride nanobelt material by the floating CVD method to improve the electromagnetic shielding performance of the silicon nitride nanocomposite material, and finally, the carbon nanotube / silicon nitride nanobelt composite material with light weight, flexibility and good electromagnetic shielding performance is prepared.

The present invention relates to an improved catalyst for MWCNT production. The present invention also relates to an iron-free supported catalyst for the selective conversion of hydrocarbons into carbon nanotubes, said catalyst comprising cobalt and vanadium as active catalytic metals in any oxidation state on a catalyst support comprising hydroxyl alumina, wherein: - the mass ratio of cobalt to vanadium is between 2 and 15; - the mass ratio of cobalt to aluminum is between 5.8 x 10 ‑2 and 5.8 x 10 ‑1 ; and - the mass ratio of vanadium to aluminum is between 5.8 x 10 ‑3 and 8.7 x 10 ‑2 . The present invention also relates to a method for the preparation of said iron-free supported catalyst and to a method for the preparation of carbon nanotubes using said iron-free supported catalyst.

The present invention relates to a method for mass synthesis of carbon nanotubes and carbon nanotubes synthesized thereby and, more specifically, to a method for mass synthesis of carbon nanotubes and carbon nanotubes synthesized thereby, wherein the method enables not only the synthesis of a catalyst at a high rate through plasma generation without a separate reductant but also the continuous mass synthesis of high-purity carbon nanotubes. The technical essences of the present invention are a method for mass synthesis of carbon nanotubes and carbon nanotubes synthesized thereby, the method comprising: a first step of supplying a CNT growth material containing a carbon precursor; a second step of disposing a pair of metal wires in a solution mixed with a metal salt, and applying electric power to the metal wires to generate plasma; and a third step of thermally treating the CNT growth material and the catalyst.

The disclosure provides a flexible electrode material, a flexible electrode, and their preparation methods and applications, belonging to the technical field of composite materials. The carbon microparticle composite material includes carbon particles and gallium oxide attached to the surface of the carbon microparticles. The flexible electrode material includes, by mass, 2-17 parts of gallium-coated carbon particles and 83-98 parts of liquid metal. The flexible electrode is prepared by coating the flexible electrode material onto a flexible substrate via screen printing, attaching copper conductive wires to both ends of the printed flexible electrode material, applying a viscoelastic material coating over the surface of the flexible electrode material, and curing and drying the flexible electrode material at room temperature. The composite material can be applied to electronic skin for detecting human body motion states and earth pressure cells for monitoring soil pressure in engineering projects.

Carbon-based composite materials are provided, such as those comprising at least 80 weight % of graphitic carbon comprising functional groups capable of forming hydrogen bonds, the graphitic carbon in the form of a mat of randomly entangled elongated structures; not more than 20 weight % of a polymer or a nanofiber thereof, dispersed within the graphitic carbon, the polymer or the nanofiber thereof comprising corresponding functional groups capable of forming hydrogen bonds with the functional groups of the graphitic carbon; and a plurality of hydrogen bonds at an interface formed between the graphitic carbon and the polymer or the nanofiber thereof, the plurality of hydrogen bonds formed between the functional groups of the graphitic carbon and the corresponding functional groups of the polymer or the nanofiber thereof.

A catalyst, catalyst precursor, and carbon nanotubes grown using the catalyst. The catalyst includes a support comprising alumina and a cobalt species on a surface of the support, wherein cobalt is the sole active catalyst species for carbon nanotube growth. The support surface is iron-free.

A carbon nanotube dispersion solution, a slurry for manufacturing an electrode containing carbon nanotubes, and a secondary battery fabricated using the same are provided. The performance of a secondary battery comprising carbon nanotubes can be improved by controlling the particle size and amount of the carbon nanotubes.

The present invention relates to a titania-carbon-sulfur (TiO2-x-C-S) composite comprising a titania-carbon (TiO2-x-C) composite prepared by mixing cylindrical carbon materials and titania (TiO2-x), in which some oxygen is reduced, to have a structure in which cylindrical carbon materials are entangled and interconnected in three dimensions; and sulfur introduced into at least a part of the external surface and inside of the titania-carbon (TiO2-C) composite, and a method for preparing the same.

Embodiments of the present disclosure generally relate to methods of producing carbon-nitrogen allotrope nanomaterials. More specifically, the methods of the present disclosure utilize nitrogen-containing compounds as a feedstock for nitrogen doped carbon nanomaterial production. In some embodiments, a method for forming carbon-nitrogen nanomaterials includes mixing a nitrogen-rich feedstock, carbon-based feedstock, and a catalyst to form a feed solution. The method further includes injecting the feed solution into a carrier gas stream and into a heated reaction vessel. The heated reaction vessel includes a first zone and a second zone. The method further includes heating the feed solution within the first zone at a first temperature. The method further includes heating the feed solution within the second zone at a second temperature to form the carbon-nitrogen nanomaterials. The method further includes removing the carbon-nitrogen nanomaterials from the heated reaction vessel.

A positive electrode according to the present disclosure comprises a sulfur-based material in an amount of 65 wt% or more based on a total 100 wt% of a positive electrode active material layer and has a porosity of 80 vol%, and thus may be used to provide a lithium-sulfur battery with high energy density.

To provide a method for manufacturing carbon nanotubes and a carbon nanotube manufacturing device capable of manufacturing carbon nanotubes with a high yield. A first manufacturing device 100 mainly includes a mass flow controller 110, a growth furnace 120, a quartz tube 130, a pressure gauge 150, an electromagnetic valve 160, a pressure adjustment valve 170, and a needle valve 180. The quartz tube 130 is a cylindrical tube made of quartz, and is inserted into the growth furnace 120. The inside of the growth furnace 120 can be adjusted to a temperature suitable for the thermal decomposition temperature of each raw material resin. The pressure gauge 150 is connected to an outlet pipe 104 extending from an outlet end of the quartz tube 130. The electromagnetic valve 160 receives a pressure value from the pressure gauge 150, and opens / closes a pipe 106 according to the pressure value. The raw material resin 144 is placed near an inlet end of the growth furnace 120. A catalyst metal 142 is placed at a position separated by a predetermined distance from the inlet end of the growth furnace 120.

This invention provides an oxidized multi-walled carbon nanotube, its preparation method, and its applications, belonging to the fields of bioengineering and materials preparation technology. The invention synthesizes oxidized multi-walled carbon nanotube materials via an oxidation method. These materials have a porous three-dimensional structure composed of a sponge-like structure, and their surface possesses numerous carboxyl and hydroxyl functional groups. The surface area of ​​the oxidized multi-walled carbon nanotube material is 137-140 m². 2 / g, total pore volume is 0.45-0.50cm³ 3 / g, with a pore size of 13.30-13.40nm; the oxidized multi-walled carbon nanotubes can protect glucoamylase from thermal denaturation at 50-60℃ and can be reused multiple times. The oxidized multi-walled carbon nanotube material can efficiently immobilize GLL, with a maximum enzyme loading capacity of 211.28mg / g. The GLL enzyme activity of the immobilized enzyme is 4 times higher than that of the free GLL enzyme, which has good practicality.

The present disclosure relates to an apparatus and method for producing catalyst particles and high aspect ratio molecular structure networks. The apparatus 1000 includes a flow reactor 1100 and a laminar flow injector 1200 configured to introduce a catalyst particle precursor 1201 into the flow reactor 1100. The laminar flow injector 1200 includes a temperature controlled flow straightener 1210 disposed upstream of the flow reactor 1100.

The present application relates to a method for manufacturing a densified carbon structure-based film, the method comprising: a step for providing a carbon structure-based film; and a carbon structure-based film densification step for obtaining a densified carbon structure-based film by immersing the carbon structure-based film in a polar solvent and then in an acidic aqueous solution, or obtaining a densified carbon structure-based film by immersing the carbon structure-based film in an acidic aqueous solution and then in a polar solvent.

The application provides a powder material plasma surface modification method based on a fiber carrier, and comprises the following steps: uniformly depositing the powder material to be treated on the surface of the fiber carrier by mechanical friction; placing the fiber carrier with the surface deposited with the powder material in a plasma treatment device; setting appropriate power, treatment time and plasma atmosphere; and performing plasma surface modification treatment to obtain the modified powder. The fiber carrier has a rich three-dimensional fiber network structure and a large surface area, can effectively disperse and capture a large number of powder particles, thereby significantly increasing the interaction surface area of the powder particles and the plasma, can significantly improve the plasma surface modification effect, efficiency and consistency of the powder material, and can successfully extend the plasma surface modification technology from the modification application field of planar materials to the modification application field of powder materials.

The present invention relates to: a carbon nanotube dispersion solution; a slurry for manufacturing an electrode, containing carbon nanotubes; and a secondary battery. The performance of a secondary battery comprising carbon nanotubes can be improved by controlling the particle size and amount of the carbon nanotubes.

The present invention provides a multi-walled carbon nanotube assembly having high conductivity, a multi-walled carbon nanotube dispersion, a conductive material, an electrode, a secondary battery, a planar assembly, a filter, an electromagnetic shield, and an extreme ultraviolet protective film. The present invention relates to a multi-walled carbon nanotube assembly comprising multi-walled carbon nanotubes, a multi-walled carbon nanotube dispersion, a conductive material, an electrode, a secondary battery, a planar assembly, a filter, an electromagnetic shield, and an extreme ultraviolet protective film, and more particularly, to a multi-walled carbon nanotube assembly comprising multi-walled carbon nanotubes, a multi-walled carbon nanotube dispersion, a conductive material, an electrode, a secondary battery, a planar assembly, a filter, an electromagnetic shield, and an extreme ultraviolet protective film. The median diameter of the volume-based particle size distribution obtained by a centrifugal sedimentation method is 80 nm or more, and the rate of change in transmittance measured by the centrifugal sedimentation method when made into an aqueous dispersion having a concentration of 0.2 mass% is 0.3% / hour or less.

A negative active material and a rechargeable lithium battery including the negative active material, the negative active material includes a silicon-carbon composite including nano-silicon and amorphous carbon; an N-doped carbon layer on the silicon-carbon composite; and a coating layer on the N-doped carbon layer, the coating layer including carbon nanotubes.

The invention relates to a method for processing a sample using glow discharge plasma, the method comprising one or more processing steps in which the sample for processing is subjected to plasma in a processing vessel provided with a temperature control system for cooling or heating the sample, wherein during the one or more processing steps the processing vessel is rotated around an axis to agitate the sample. The invention also relates to a device for use in such a method.

Embodiments of the present disclosure generally relate to methods of producing carbon-nitrogen allotrope nanomaterials. More specifically, the methods of the present disclosure utilize nitrogen-containing compounds as a feedstock for nitrogen doped carbon nanomaterial production. In some embodiments, a method for forming carbon-nitrogen nanomaterials includes mixing a nitrogen-rich feedstock, carbon-based feedstock, and a catalyst to form a feed solution. The method further includes injecting the feed solution into a carrier gas stream and into a heated reaction vessel. The heated reaction vessel includes a first zone and a second zone. The method further includes heating the feed solution within the first zone at a first temperature. The method further includes heating the feed solution within the second zone at a second temperature to form the carbon-nitrogen nanomaterials. The method further includes removing the carbon-nitrogen nanomaterials from the heated reaction vessel.

The present invention relates to a carbon nanotube dispersion liquid comprising carbon nanotubes, a dispersant, and a dispersion medium, wherein the dispersant comprises a first dispersant and a second dispersant in a weight ratio of 100:10 to 90, the first dispersant being a dispersant containing an N atom, and the second dispersant being a compound containing a sulfone group, a hydroxyl group, and an aromatic ring in its molecular structure, and the weight ratio of the carbon nanotubes to the dispersant being 100:25 to 500, the carbon nanotube dispersion liquid having low viscosity and minimal change in viscosity over time.

The present disclosure relates to a method for preparing a porous carbon material including: (1) a step of centrifugally milling a porous carbon material; and (2) a step of filtering the centrifugally milled porous carbon material through a sieve, wherein a mesh size of the sieve is 2.8 to 4 times of a D50 particle size of the porous carbon material filtered through the sieve in the step (2). The present disclosure also relates to a porous carbon material prepared by the above-described method, a sulfur-carbon composite and a lithium-sulfur battery including the porous carbon material prepared by the above-described method.

One embodiment of the present specification provides a catalyst for producing carbon nanotubes, comprising a metal component represented by the following formula 1: <Expression 1> Co x :[M1,Zr] y :M2 z In the above formula, Co represents cobalt, an oxide or a derivative thereof, M1 represents at least one metal selected from Al, Ca, Si, Ti and Mg, an oxide or a derivative thereof, Zr represents zirconium, an oxide or a derivative thereof, M2 represents at least one metal selected from W, V, Mn and Mo, an oxide or a derivative thereof, and 0.2≦x / y≦2.6, 6≦x / z≦13.

The invention provides a ferric sodium phosphate pyrophosphate composite material as well as a preparation method and application thereof, and the preparation method comprises the following steps: performing oxygen plasma treatment on carbon nanotubes, and dispersing the treated carbon nanotubes in a silane coupling agent solution for reaction to obtain a modified carbon nanotube carrier material; mixing the modified carbon nanotube carrier material with a first solvent to obtain a modified carbon nanotube dispersion liquid, mixing an iron source, a sodium source, a phosphorus source and a conductive carbon material with the modified carbon nanotube dispersion liquid, and carrying out spray drying treatment to obtain a precursor material; and mixing and dispersing the precursor material, the composite carbon source, melamine and a second solvent, drying and sintering to obtain the ferric sodium pyrophosphate composite material. The carbon conductive network is constructed in the material, the outer layer is coated with the modified carbon layer, the bonding strength of the interior of the material and the coating layer is high, the interface resistance is small, and the electron transmission efficiency and the structural stability of the material are obviously improved.

The application relates to the technical field of lithium battery negative electrode materials, and discloses a kind of nano composite negative electrode materials, raw materials are calculated according to weight fraction, composition includes: 3-4 parts of carbon nanotube, 135-150 parts of concentrated nitric acid, 315-330 parts of concentrated sulfuric acid, 600-650 parts of dilute hydrochloric acid, 30-40 parts of anhydrous ethanol, 7.5-10 parts of polyethylene imine, 25-30 parts of molybdenum disulfide, 10-12 parts of surfactant, 3325-3600 parts of deionized water.The MoS2 nanosheet layer and MWCNTs modified by electrostatic force assisted self-assembly method are self-assembled in solution, MoS2 / PVP / PEI / MWCNTs quaternary composite is obtained, and finally heat treatment is carried out to obtain the final MoS2 / MWCNTs nano composite negative electrode material, which has higher reversible capacity, better cycle stability and rate performance.In addition, the preparation method does not need high temperature and high pressure condition, is efficient, convenient and energy-saving and environment-friendly.

A method of making an array of vertically-aligned CNT bundles includes dispersing iron oxide nanoparticles in a solvent to form a suspension. The method further includes dipping a TiN-coated substrate in the suspension and removing to form a suspension-coated substrate. The method also involves drying the suspension-coated substrate by evaporating the solvent from the suspension-coated substrate to form a first sample. Furthermore, the method includes treating the first sample by microwave plasma under hydrogen flow at 500 degrees centigrade (° C.) to 700° C. to form a pre-treated sample followed by treating the pre-treated sample by microwave plasma under methane flow at 500° C. to 700° C. to form the vertically-aligned carbon nanotube bundles.