352results about "Single-walled nanotubes" patented technology

The invention provides an aerosol-assisted single-walled carbon nanotube preparation system and method, and relates to the field of single-walled carbon nanotube preparation. The system comprises a catalyst atomization unit, a catalyst screening unit, a chemical vapor deposition reaction unit and a collection unit, the catalyst screening unit is arranged at the joint of the catalyst atomization unit and the chemical vapor deposition reaction unit, and the collecting unit is connected to the tail end of the chemical vapor deposition reaction unit; the outer diameter of the catalyst screening unit is smaller than the outer diameter of the catalyst atomization unit and the outer diameter of the chemical vapor deposition reaction unit. According to the invention, the liquid catalyst is pre-atomized by using an aerosol atomization technology and then is screened, so that uniform small-particle-size catalyst particles can be obtained through sufficient vaporization more easily, the formation of large catalyst particles is effectively inhibited, the growth diameter of the single-walled carbon nanotube is effectively controlled, the formation of amorphous carbon is reduced, and the yield of the single-walled carbon nanotube is improved. And thus, the quality and purity of the single-walled carbon nanotube can be improved.

The invention provides a system for preparing a single-walled carbon nanotube based on a pulsed plasma arc, which can improve the yield of the single-walled carbon nanotube. Two electrode module groups are arranged in an electric arc reaction cavity and are respectively used as an anode and a cathode, and a pulse power supply drives a motor module group to generate a pulse plasma electric arc; a pulse plasma arc is used as a heat source, a mixed solution of a catalyst and a catalyst auxiliary agent is atomized and then is fed into an arc reaction cavity by using carrier gas to react with a gaseous carbon source which is independently fed, and a high-purity single-walled carbon nanotube is grown on the surface of the fine catalyst through plasma flow between a cathode and an anode and a cracked carbon source, so that the high-purity single-walled carbon nanotube is obtained. And a produced product is obtained in a collection chamber at the tail end of the system. Meanwhile, the invention also discloses a method for preparing the single-walled carbon nanotube based on the pulse plasma arc.

The invention relates to a method for continuously preparing a single-walled carbon nanotube, which comprises the following steps of: uniformly mixing organic metal and a growth promoter in proportion to form a catalyst, adding the catalyst into a dust spraying device, connecting each gas pipeline and a preheating furnace inlet, connecting an outlet of the preheating furnace with a vertical tube furnace, and sealing the whole device; firstly introducing inert gas to remove air, then preheating the furnace, and heating the vertical tube furnace; after the temperature is stable, the injection device injects a catalyst into the preheating furnace, the preheating furnace and the vertical tube furnace are kept at the constant temperature, and the single-walled carbon nanotubes continuously grow; after the catalyst is consumed, stopping gas supply, turning off a power supply, and taking a sample at room temperature. The catalyst is fully preheated before entering a vertical tube furnace, and the reaction activity of the catalyst reaches the highest; the temperature in the furnace chamber of the reactor is constant, organic gas is fully contacted with a catalyst, carrier gas and reducing gas and is uniformly heated, and continuous growth of the carbon nanotubes is facilitated; the energy consumption is low, the occupied area is small, the operation is simple, continuous production can be realized, the productivity is high, the length-diameter ratio is large, the G / D value is large, and the specific surface area is large.

The invention provides a method for preparing a carbon nanotube with assistance of carbon dioxide, which is characterized in that methane is used as a carbon source, carbon dioxide is used as auxiliary gas, and the carbon nanotube is prepared under the action of a catalyst. Carbon deposition generated by using methane as carbon source gas is reduced by using carbon dioxide, and the quality and performance of single-wall, double-wall or three-wall carbon nanotubes are improved, so that application requirements are met.

The present invention discloses a graphene-coated lithium iron phosphate cathode material and a preparation method thereof, belonging to the technical field of lithium iron phosphate cathode materials. First, iron phosphate is loaded on graphene, and by controlling the pH adjustment time, small-particle-size FePO 4 / GO and large-particle-size FePO 4 / GO are accurately obtained. Iron phosphate is loaded on single-walled carbon nanotubes to prepare FePO 4 / SWCNT. Then, the loaded material and a lithium source are subjected to a pre-calcination reaction to grow and form graphene-coated lithium iron phosphate. Finally, dopamine is oxidized and self-polymerized to form polydopamine, which is coated on the outer layer of the graphene-coated lithium iron phosphate. After calcination and carbonization, a double coating of porous carbon material and graphene is formed. The particle size distribution of the prepared cathode material is optimized by using iron phosphate materials with different particle sizes and shapes to improve its tap density, and the conductivity is improved by graphene coating, endowing the cathode material with excellent electrochemical performance.

The invention discloses a method for purifying a carbon nano tube by using a deep eutectic solvent. The method comprises the following steps: drying carbon nanotube powder prepared on a supported catalyst by adopting a chemical vapor deposition method; the method comprises the following steps: mixing a hydrogen bond donor and a hydrogen bond acceptor according to a fixed molar ratio, and stirring at a set temperature to obtain a homogeneous eutectic solvent; adding the dried carbon nanotube powder into a deep-eutectic solvent, and dissolving the supported catalyst particles by regulating and controlling the temperature and the time; and carrying out vacuum filtration, cleaning and drying treatment on the reacted liquid to obtain the high-quality carbon nanotube. Compared with a traditional strong acid purification process, the method has the advantages of being simple, environmentally friendly, low in cost and the like, the intrinsic structure and surface characteristics of the carbon nanotubes can be effectively kept, and the method has important industrial application prospects.

The present invention relates to a carbon nanotube dispersion comprising carbon nanotubes, a dispersant and a dispersion medium, in which the dispersant comprises a first dispersant and a second dispersant in a weight ratio of 100: 10 to 100: 90, the first dispersant being a dispersant containing a cyclic amide group, the second dispersant being a dispersant containing a cyclic amide group, and the dispersion medium being a dispersant containing a cyclic amide group. The second dispersant is a polymer compound containing both a sulfonyl group and a styrene, and a weight ratio of the carbon nanotubes to the dispersant is from 100: 50 to 100: 500, thereby having a low viscosity and particles contained therein having a small particle size.

The invention relates to the technical field of carbon nanomaterials, in particular to a single-walled carbon nanotube purification method. Introducing a solvent into the initial sample of the single-walled carbon nanotube: putting the single-walled carbon nanotube with the mass A into a container, adding the solvent with the mass B, and fully stirring to obtain a wet material; low-temperature oxidation in a strong oxidizing atmosphere: putting the wet single-walled carbon nanotube material into a reactor, continuously introducing inert gas, heating the reactor to a relatively low temperature T1, introducing strong oxidizing gas after the temperature is stable, and stopping introducing the strong oxidizing gas after reacting for a certain time; and acid treatment: dispersing the obtained sample into an acid solution, stirring for reaction, and then filtering and drying to obtain the purified single-walled carbon nanotube. According to the method, the purification efficiency, retention rate and purity of the single-walled carbon nanotubes are greatly improved.

The invention discloses a method for preparing a single-walled carbon nanotube, and belongs to the technical field of single-walled carbon nanotubes. When the single-walled carbon nanotube is prepared, the single-walled carbon nanotube is grown by using a chemical vapor deposition method; then, the grown single-walled carbon nanotubes are subjected to acid pickling, then, the carbon tubes are sorted and purified by adopting a polymer dispersant, and finally, the polymer dispersant is removed to obtain the single-walled carbon nanotubes; the polymer dispersant disclosed by the invention is obtained by reacting an aldehyde-terminated fluorenyl surfactant with diamino dipyridyl; wherein the aldehyde-terminated fluorenyl surfactant is obtained by polymerizing 9, 9-di-n-octylfluorene-2, 7-diboric acid di-pinacol ester and quaternary ammonium salt containing 2, 7-dibromofluorene, and then reacting with 5-formyl-2-thiopheneboronic acid pinacol ester for end capping; the prepared single-walled carbon nanotube is relatively high in purity and relatively high in finished product conversion rate.

High-performance carbon nanotube (CNT) based millimeter-wave transistor technologies and demonstrate monolithic millimeter-wave integrated circuits (MMICs) based thereon, and methods and processes for the fabrication thereof are also provided. CNT technologies and MMICs demonstrate improved power efficiency, linearity, noise and dynamic range performance over existing GaAs, SiGe and RF-CMOS technologies. Methods and processes in CNT alignment and deposition, material contact and doping are configured to fabricate high quality CNT arrays beyond the current state-of-the-art and produce high performance RF transistors that are scalable to wafer size to enable fabrication of monolithic integrated circuits based on CNTs.

The present invention relates to a carbon nanotube dispersion comprising carbon nanotubes, a dispersant and a dispersion medium, in which the dispersant comprises a first dispersant and a second dispersant in a weight ratio of 100: 10 to 100: 90, the first dispersant being a dispersant containing N atoms, the second dispersant being a dispersant containing N atoms, and the dispersion medium being a dispersant containing N atoms. The second dispersant is a compound containing a sulfonic acid group, a hydroxyl group, and an aromatic ring in a molecular structure, and a weight ratio of the carbon nanotubes to the dispersant is 100: 50 to 100: 500, thereby having a low viscosity and a small change in viscosity over time.

Provided are a carbon sheet having excellent performance in terms of inhibiting lithium dendrite growth and a method of producing this carbon sheet. Also provided are a laminate and an electrical storage device that include a carbon sheet having excellent performance in terms of inhibiting lithium dendrite growth. The carbon sheet is a carbon sheet containing carbon nanotubes, wherein the carbon nanotubes and the carbon sheet each have pores, and the distribution states of these pores satisfy specific requirements.

The present invention provides a carbon nanotube dispersion, a method for preparing the same, an electrode slurry composition comprising the carbon nanotube dispersion, and a secondary battery, the carbon nanotube dispersion comprising: carbon nanotubes; a first dispersant surrounding the surface of the carbon nanotubes; a second dispersant for introducing charges to the surfaces of the carbon nanotubes; and a storage stabilizer having an electrostatic repulsive force to the charge.

This invention relates to single-walled carbon nanotube films and methods and apparatus for their manufacture. This document discloses apparatus and methods for manufacturing large-diameter single-walled carbon nanotube films. Advantageously, large-diameter single-walled carbon nanotube films can be used as transparent electrodes with high transparency and low sheet resistance. In one embodiment, the method includes: supplying a support of carbon monoxide and a catalyst precursor through a first inlet at a temperature lower than the reaction temperature of the catalyst precursor; supplying heated carbon monoxide through a second inlet, such that the heated carbon monoxide is mixed with the support of carbon monoxide and the catalyst to form an aerosol; and reacting the aerosol in a reaction chamber to form a composite aerosol of single-walled carbon nanotubes, metal nanoparticles, carbon monoxide, and carbon dioxide. In this embodiment, the heated carbon monoxide heats the catalyst precursor, which reacts with the carbon monoxide to form carbon nanotubes.

This invention provides a carbon nanotube dispersion capable of achieving high electrical conductivity even with a small amount of carbon nanotube, and an electrically conductive material using the same. A carbon nanotube dispersion of the present invention contains a carbon nanotube, a dispersant, and a binder component. The carbon nanotube is preferably a single-walled carbon nanotube. The binder component is preferably an acrylic resin. An electrically conductive material of the present invention contains a carbon nanotube dispersion described above.

To enable effective EUV lithography processing.SOLUTION: There is disclosed a filtration formed nanostructure pellicle film. The filtration formed nanostructure pellicle film includes a plurality of carbon nanofibers that are intersected randomly to form an interconnected network structure in a planar orientation. The interconnected structure has a thickness ranging from a lower limit of 3 nm to an upper limit of 100 nm, and has a plurality of pores.SELECTED DRAWING: Figure 1

The invention discloses a continuous and stable preparation device and method for a single-walled carbon nanotube, and relates to the technical field of nanocarbon material preparation, the continuous and stable preparation device for the single-walled carbon nanotube structurally comprises hollow graphite, a graphite crucible, a plasma electric arc furnace body, an air inlet and a discharge port, the hollow graphite serves as a cathode of the plasma electric arc furnace, and the graphite crucible serves as an anode of the plasma electric arc furnace. The plasma arc is initiated between the graphite electrodes, so that the plasma high-temperature evaporation catalyst is fully utilized, the defect of arc striking of a graphite cathode and a liquid catalyst anode in a conventional method is avoided, the evaporation rate of the catalyst is reduced, and the problem of arc breaking caused by metal droplet sputtering and coking in the liquid electrodes is solved; a series of defects of a conventional scheme are avoided through the convex crucible anode, so that the continuous stability of the reaction is greatly improved, and stable and continuous preparation of the single-walled carbon nanotube is realized.

Provided is a carbon nanotube dispersion liquid having excellent dispersion stability of single-layer carbon nanotubes. A carbon nanotube dispersion liquid according to an embodiment contains single-layer carbon nanotubes, carboxymethyl cellulose and / or a salt thereof, and water, wherein the content of the single-layer carbon nanotubes is 0.47-1.00 mass%. The carboxymethyl cellulose and / or the salt thereof contains at least one type of carboxymethyl cellulose and / or a salt thereof having a degree of etherification of 0.65-0.85 and a weight-average molecular weight of 120,000-250,000. The content of the carboxymethyl cellulose and / or the salt thereof is 120-220 parts by mass per 100 parts by mass of the single-layer carbon nanotubes.

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.

The invention belongs to the field of single-walled carbon nanotube production, and particularly relates to a single-walled carbon nanotube multi-temperature-zone continuous production reaction furnace which comprises a furnace body shell, side plates are fixedly connected to the two ends of the furnace body shell, the two side plates are fixedly connected with connecting flanges respectively, and a reaction tube component is fixedly connected between the two connecting flanges. The reaction tube component is arranged in a five-section splicing mode, a heating temperature control component is arranged at the position, corresponding to each section, of the outer side of the reaction tube component in the furnace body shell, and the five heating temperature control components correspond to the first temperature zone to the fifth temperature zone in the raw material flowing direction. The processing and production difficulty is reduced through the multi-section spliced reaction tube component, and a plurality of temperature zones are adopted for zoned temperature control, so that a gas raw material is fully preheated and then heated to react, the length of a single-walled carbon nanotube is prolonged at a constant temperature, the yield and the yield are improved, and the gas raw material is guided by a convex ridge to enable gas flow to roll and stir; therefore, collision and contact between carbon-containing gas molecules and the catalyst are increased, and the yield is increased.

A method for preparing carbon nanotubes according to an embodiment of the present invention comprises the steps of: injecting a carbon source, a metal catalyst, a co-catalyst, and a carrier gas into a reactor; and heating the reactor to prepare the carbon nanotubes. The ratio of the molar flow rate of the carbon source to the molar flow rate of the metal catalyst is 350 to 1300.

To provide a fibrous carbon nanostructure that can be easily surface-modified.SOLUTION: A fibrous carbon nanostructure of the present invention has a symmetry factor of 3.70 or less for a peak of a first derivative curve of a thermogravimetric curve obtained by thermogravimetric analysis under a dry air atmosphere. The first derivative curve of the thermogravimetric curve can be a temperature derivative curve of the thermogravimetric curve or a time derivative curve of the thermogravimetric curve.SELECTED DRAWING: Figure 2

The present disclosure provides an apparatus capable of continuously producing carbon nanotubes having high crystallinity, a low residual catalyst content and a high aspect ratio. The apparatus for producing carbon nanotubes includes: a reaction unit configured to synthesize carbon nanotubes (CNTs); a supply unit configured to supply a carbon source to the reaction unit through a supply pipe; and a collection unit configured to collect carbon nanotubes discharged from the reaction unit, wherein the reaction unit may include a chemical vapor deposition reactor.

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

To provide a fibrous carbon nanostructure that facilitates surface modification treatment.SOLUTION: In a fibrous carbon nanostructure, a half width of a peak of a temperature differential curve that is a primary differential curve of a thermogravimetric curve obtained by a thermogravimetric analysis in a dry air atmosphere is 38°C or higher and below than 90°C, and a high temperature side temperature at a height of one tenth of a peak top height of the peak is 658°C or higher.SELECTED DRAWING: Figure 1

The present application discloses a method for converting a carbon nanotube aqueous dispersion into an organic dispersion. The method includes the steps of: providing a carbon nanotube aqueous dispersion; mixing the carbon nanotube aqueous dispersion with a first solvent containing a hydrophilic organic solvent to obtain a first suspension; mixing the first suspension with a second solvent containing a hydrophobic organic solvent to form two layered phases to obtain a second suspension; mixing the second suspension with a third solvent to obtain a third suspension; dispersing the second suspension or the third suspension to obtain a carbon nanotube organic dispersion, achieving solvent transfer of the carbon nanotubes, and achieving solvent transfer from the aqueous phase to the organic phase of the carbon nanotube dispersion. The method provided by the present application can convert a carbon nanotube aqueous dispersion into an organic dispersion, with a transfer efficiency of 70% to 95%.

The present invention relates to a carbon nanotube dispersion 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 100:115, the first dispersant is a dispersant comprising an N atom, the second dispersant comprises a compound comprising one aromatic ring and two or more hydroxyl groups in a molecular structure, and a weight ratio of the carbon nanotubes and the dispersant is 100:50 to 100:500, thereby having a small size of particles contained in the carbon nanotube dispersion.

The invention provides a carbon nanotube purification method, which comprises: carrying out densification treatment on a carbon nanotube, and purifying the densified carbon nanotube at a temperature of 800-1400 DEG C by using ammonium chloride to obtain a purified carbon nanotube. According to the purification method provided by the invention, purification is carried out under the sub-high temperature condition of 800-1400 DEG C, the purification purity of the carbon nanotubes is high, and the content of metal impurities is low; pre-oxidation heat treatment is not needed, and the phenomenon that the structure of the carbon nano tube is damaged by high-temperature heat treatment at the temperature of 1700 DEG C or above is avoided; meanwhile, the purification efficiency is improved, and industrial amplification of the whole purification method is facilitated.

To provide a carbon nanotube dispersion that offers superior dispersibility and long-term storage stability and enables improvement of secondary battery performance, a method of preparing the same, an electrode slurry composition and a secondary battery including the same.SOLUTION: A carbon nanotube dispersion comprises carbon nanotubes, a first dispersant that surrounds the surface of the carbon nanotubes, a second dispersant that introduces charges to the surface of the carbon nanotubes, and a storage stabilizer having electrostatic repulsion against the charges. A method for producing the carbon nanotube dispersion comprises steps of: preparing a mixture by mixing the carbon nanotubes, the first dispersant containing a nonionic polymer, the second dispersant containing an ionic polymer, the storage stabilizer containing a phenolic compound having two or more aromatic rings, and an aqueous solvent; milling the mixture to crush it; and dispersing the mixture.SELECTED DRAWING: None

The invention discloses a graphene-coated lithium iron phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of lithium iron phosphate positive electrode materials.The preparation method comprises the steps that firstly, iron phosphate is loaded on graphene, the time is adjusted by controlling the pH value, small-particle-size FePO4 / GO and large-particle-size FePO4 / GO are accurately obtained, FePO4 / SWCNT is prepared by loading iron phosphate on a single-walled carbon nanotube, and then the graphene-coated lithium iron phosphate positive electrode material is obtained; the preparation method comprises the following steps: carrying out a pre-calcination reaction on a loaded material and a lithium source to form graphene-coated lithium iron phosphate, carrying out dopamine oxidation self-polymerization to form polydopamine, coating the outer layer of the graphene-coated lithium iron phosphate with the polydopamine, and carrying out calcination carbonization to form double-layer coating of a porous carbon material and graphene. The particle size distribution of the prepared positive electrode material is optimized by utilizing the iron phosphate loaded materials with different particle sizes and shapes, the compaction density is improved, the conductivity is improved by utilizing graphene coating, and the positive electrode material is endowed with excellent electrochemical performance.