1638results about "Nitrogen compounds" patented technology

The invention relates to the technical field of composite film preparation, in particular to a multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film and a preparation method thereof.The multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film comprises a base material layer, a gas barrier layer, a bonding transition layer and a nano ceramic functional coating; the base material layer comprises the following components in parts by mass: 80-100 parts of biaxially oriented polypropylene; 20 to 30 parts of metallocene linear low density polyethylene; 5 to 8 parts of nano titanium dioxide; 0.5 to 1 part of beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid; and 0.3 to 0.6 part of calcium stearate. Through the multi-layer co-extrusion and gradient curing technology and the five-layer co-extrusion technology, it is ensured that the thickness of a base film is uniform and interlayer bonding is firm, the adhesive force of the coating is enhanced through plasma surface treatment, and activity retention and uniform distribution of functional components are guaranteed through the segmented curing strategy of the nano ceramic coating; compared with a traditional hot-pressing compounding or solvent coating process of the composite film, the energy consumption and the solvent residue risk are greatly reduced, meanwhile, the production efficiency and the product consistency are improved, and large-scale application is provided for medicine packaging.

The invention relates to the field of aluminum materials, and provides an automobile corrosion-resistant aluminum material and a preparation method thereof.The automobile corrosion-resistant aluminum material is prepared from cerium oxide loaded aluminum oxide nanorods, scandium / boron nitride nanotubes, zirconium powder, magnesium powder, copper powder, manganese powder, silicon carbide nanoparticles, TiB2 nanoparticles, aluminum powder and stearic acid. Wherein the cerium oxide loaded aluminum oxide nanorod is composed of an aluminum oxide nanorod and cerium oxide nanoparticles loaded on the surface of the aluminum oxide nanorod, and the scandium / boron nitride nanotube is composed of a boron nitride nanotube and a scandium nanolayer uniformly coated on the surface of the boron nitride nanotube. The material is prepared through mechanical ball milling, cold isostatic pressing forming, vacuum sintering and aging treatment, and finally the aluminum-based composite material containing the Al3Sc nano precipitated phase and the boron nitride nanotube reinforced phase is formed. And an Al3Sc precipitated phase and an aluminum matrix form a coherent interface, so that the strength, the corrosion resistance and the wear resistance of the material are improved. Through nanostructure optimization, high performance of the aluminum alloy is achieved, and the aluminum alloy is suitable for the fields of automobiles, aerospace and the like.

The invention provides modified aluminum nitride and a preparation method thereof, and the preparation method comprises the following steps: grinding a mixed material comprising aluminum nitride powder, a dispersing agent and an alcohol solvent to obtain nanoscale aluminum nitride powder with the particle size of 50-400 nm; the nanoscale aluminum nitride powder is subjected to first freeze drying treatment, and freeze-dried aluminum nitride powder is obtained; and mixing a solution containing dopamine with the freeze-dried aluminum nitride powder, and then carrying out second freeze-drying treatment to obtain the modified aluminum nitride. The method is helpful for improving the hydrolysis resistance of aluminum nitride.

The invention belongs to the technical field of biomedical engineering, and particularly relates to a single-base resolution laminated two-dimensional material nanopore structure, a DNA sequencing device and a DNA sequencing method. The two-dimensional material nanopore structure comprises an insulating layer and conducting layers arranged on the upper side and the lower side of the insulating layer, through nanopores are formed in the insulating layer and the conducting layers, and the pore diameter of the nanopores is 2-5 nm; the insulating layer and the conductive layer are made of two-dimensional materials. The conductive layers on the two sides serve as upper and lower electrodes, and a power supply is connected between the upper and lower electrodes to form a phase conductive path which is provided with a longitudinal current detection element. A plurality of groups of two-dimensional material nanopore structures are stacked, and meanwhile, a plurality of groups of base pair signals are obtained. According to the invention, the advantages of small thickness, high physical strength and the like of the two-dimensional material nanopore are kept by using a few layers of two-dimensional material films, the vibration of the films is reduced by increasing the number of layers and improving the mechanical strength, so that the signal-to-noise ratio is improved, and the spatial resolution of the nanopore sensor is improved by designing the upper electrode and the lower electrode.

Molecular electrocatalytic systems for ammonia production from wastewater nitrate are described. The electrocatalytic systems use ammonia-selective homogeneous molecular NOsRR catalysts in real wastewater.

Improved electrocatalysts for promoting a hydrogen evolution reaction (HER) or an oxygen evolution reaction (OER) from alkaline fresh water and seawater are disclosed. By incorporating metals, such as tungsten and rare earth elements, into the nickel molybdenum nitride framework, Ni1-xMoxN, the disclosed electrocatalysts demonstrate improved catalytic activity and stability compared to the original Ni&Ni0.2Mo0.8N catalysts, particularly under high-current alkaline conditions, in water electrolysis for hydrogen and oxygen production.

A phosphor plate includes a plate-like composite including a base material and a phosphor contained in the base material, in which the base material contains spinel, the phosphor includes a phosphor containing a Si element, and in an X-ray diffraction pattern of the phosphor plate using a Cu-Kα ray, in a case in which peak intensity corresponding to the spinel having a diffraction angle 2θ in a range of 36.0° or more and 37.4° or less is set to 1, total intensity of peaks having a diffraction angle 2θ in a range of 32.5° or more and 34.5° or less satisfies 0.5 or less.

The invention relates to the technical field of wear-resistant materials, in particular to a nano wear-resistant composite material and a preparation method and application thereof, and the nano wear-resistant composite material comprises the following raw materials in parts by weight: 45-50 parts of nano tungsten carbide, 10-15 parts of cobalt powder, 7-11 parts of a modified nano titanium nitride agent, 5-7 parts of nano neodymium oxide, and 4-6 parts of a nano TaC-doped complexing agent. According to the nano wear-resistant composite material, the nano tungsten carbide is matched with the cobalt powder and the nano neodymium oxide, the modified nano titanium nitride agent, the doped nano TaC and the synergist are coordinated and matched, and the raw materials are coordinated and synergistic, so that the wear resistance, the yield strength performance and the fatigue resistance of the obtained nano wear-resistant composite material are coordinated and improved; meanwhile, the product is excellent in performance stability under different degrees of salt corrosion conditions.

The invention discloses a bursting type radiation growth silicon nitride nanowire modified carbon fiber material and a preparation method thereof, and belongs to the technical field of preparation of modified carbon fiber materials. The bursting type radiation growth silicon nitride nanowire modified carbon fiber material comprises silicon nitride nanowires and carbon nanotube modified carbon fibers, the silicon nitride nanowires grow around the carbon nanotube modified carbon fibers in a bursting radiation manner; the silicon nitride nanowires cross and cover the surface of the carbon nanotube modified carbon fiber to form a network structure; the periphery of the carbon nanotube modified carbon fiber is provided with a double-layer pore structure, and the double-layer pore structure is a pore between the carbon nanotube modified carbon fiber and the silicon nitride nanowires and a micro-nano pore between the silicon nitride nanowires. The carbon fiber material on which the silicon nitride nanowires grow has good oxidation resistance, the weight loss ratio of the carbon fiber material at high temperature is reduced, and the service time of the material under the high-temperature oxidation condition is prolonged.

Provided is a process and an apparatus for purifying boron nitride nanotube (BNNT) materials. The process involves the use of a halogen gas to remove halogen-reactive impurities from boron nitride nanotube (BNNT) materials in a single step with minimal interactions to produce structurally pristine BNNT. Gaseous byproducts are produced that 5 can be removed without the need for solution phase treatments. Yield efficiencies and purity of recovered BNNT are high compared to the other known methods of purification for BNNT material.

The invention provides low-moisture-absorption and high-thermal-conductivity electrical-grade magnesium oxide and a preparation method thereof.The preparation method comprises the steps that silicon powder and silica sol are mixed to serve as coating slurry; carrying out coating treatment on the fused magnesium oxide by using the coating slurry, and then drying and screening to prepare silicon-coated fused magnesium oxide powder; the preparation method comprises the following steps: performing multi-stage preheating treatment and nitriding treatment on silicon-coated fused magnesium oxide powder in a nitrogen atmosphere, so that silicon powder on the surface of magnesium oxide is nitrided to form molten silicon nitride, and finally cooling and sizing to obtain high-temperature electrical-grade magnesium oxide powder with a spherical core-shell structure. The electrical grade magnesium oxide powder can resist high temperature and moisture, more importantly, the heat conduction performance of magnesium oxide is ensured, and the flowability and filling efficiency of the powder are improved.

The invention provides a silicon-carbon negative electrode material and a preparation method thereof, and particularly relates to the technical field of lithium battery negative electrode materials. The silicon-carbon negative electrode material comprises coating porous carbon, coating silicon deposited in channels of the coating porous carbon and an amorphous carbon layer coating the outer layer of the coating porous carbon, the coating porous carbon comprises porous carbon and a first silicon nitride coating; the first silicon nitride coating coats the interiors of pore channels of the porous carbon and the outer surface of the porous carbon; and the coating silicon comprises silicon and a second silicon nitride coating coated on the surface of the silicon. In the silicon-carbon negative electrode material provided by the invention, the porous carbon is protected through the first silicon nitride coating, side reaction is reduced, charge and discharge stress is buffered, and structural damage is prevented. The second silicon nitride coating relieves the stress of the silicon material and protects the structural integrity. The layered silicon nitride enhances the electrochemical performance, and the amorphous carbon layer reduces the side reaction, thereby improving the efficiency and service life of the battery, and ensuring the double improvement of the battery performance and structural stability.

The invention provides silicon nitride and aluminum nitride powder and a preparation method, and relates to the technical field of ceramic powder. The preparation method of the silicon nitride and aluminum nitride powder comprises the following steps: mixing aluminum powder and aluminum nitride raw powder to obtain a first mixture; mixing silicon powder, silicon nitride raw powder and ammonium salt to obtain a second mixture; paving the first mixture and the second mixture in a material frame padded with a carbon felt, and separating the first mixture from the second mixture by using the carbon felt; the material frame is placed in a self-propagating reaction kettle, nitrogen is introduced after vacuumizing, and the first mixture is ignited so as to induce a combustion synthesis reaction of the second mixture; and after the combustion synthesis reaction, cooling to room temperature, releasing the pressure in the self-propagating reaction kettle, taking out a synthetic product, and grinding the synthetic product to obtain silicon nitride powder and aluminum nitride powder. The purity of the powder material can be improved.

The invention discloses a modified hexagonal boron nitride nanosheet, a modified hexagonal boron nitride grinding fluid and a preparation method of the modified hexagonal boron nitride nanosheet, the modified hexagonal boron nitride nanosheet is a hydroxylated h-BN nanosheet prepared through an electrolytic method, and the modified hexagonal boron nitride grinding fluid comprises the following components in percentage by mass: 60-80% of deionized water; 5-15% of a surfactant II; 5-15% of a modified hexagonal boron nitride nanosheet; 5-15% of a grinding aid; and a pH regulator II. H2O2 is used as a mild oxidizing agent, and hydroxyl can be introduced under the condition that the basic structure of h-BN is not damaged; the electrolysis process not only promotes decomposition of H2O2 to generate active hydroxyl, but also contributes to stripping of h-BN; more uniform hydroxyl distribution can be generated on the h-BN surface through the electrolytic method; compared with a ball milling method and an electrolytic method, the hydroxylation and stripping processes can be completed within a shorter time, mechanical damage in the ball milling process is avoided, the integrity of the h-BN nanosheet is kept, and expanded production is easy.

Flash Joule heating (FJH) for production of one-dimensional (1D) carbon and / or boron nitride nanomaterials, and 1D materials integrated with 0D, 1D, 2D, and 3D nanomaterials, composites, nanostructures, networks, and mixtures thereof. Such materials produced by FJH include 1D carbon and hybrid nanomaterials, boron nitride nanotubes (BNNTs), turbostratic boron-carbon-nitrogen (BCN), doped (substituted) graphene, and heteroatom doped (substituted) re-flashed graphene.

The invention relates to an installation (1) for recovering CO2 from a feed gas stream (FG), comprising: - a unit (2) for treating the feed gas stream (FG) in order to produce a CO2-enriched gas stream (FCO2) and a nitrogen-enriched gas stream (FN) from the feed gas stream; - a compression stage (5) for compressing the feed gas stream (FG); - an expansion stage (8) capable of outputting mechanical energy generated by expansion of the nitrogen-enriched gas stream; - a thermal device (10) arranged to enable heat transfer between the gas stream leaving the compression stage (5) and the nitrogen-enriched gas stream before expansion; and - a device (4) for utilizing the mechanical energy output by the expansion stage.

An exemplary embodiment of the present disclosure provides a method for making an electrolyte, comprising: providing a solid polymer electrolyte (SPE); incorporating boron nitride with the SPE to form a composite polymer electrolyte (CPE), wherein the boron nitride is at least one of exfoliated hexagonal boron nitride (ex-BN) or fluorine-fimctionalized hexagonal boron nitride (BN-F).

The invention provides a preparation method of a molybdenum phosphide / titanium nitride composite material and a battery positive electrode material and a lithium-carbon dioxide battery, and belongs to the technical field of new energy materials. And then a titanium nitride conductor layer is deposited on the molybdenum phosphide by using an atomic layer deposition technology to prepare the molybdenum phosphide / titanium nitride, the molybdenum phosphide is combined as a transition metal phosphide to have stable catalytic performance, and the titanium nitride is used as a conductor to have excellent conductivity. The lithium-carbon dioxide battery positive electrode catalyst with high catalytic activity, high conductivity and excellent stability is obtained through the synergistic effect of the two materials, and when the lithium-carbon dioxide battery positive electrode catalyst is applied to a lithium battery, higher energy density, longer cycle life and better rate capability are shown, so that the overall performance of the battery is improved, and the application prospect is wide. The requirements on high-performance batteries in the fields of electric automobiles, energy storage systems and the like are met.

Provided is a silicon nitride powder containing silicon nitride and carbon, wherein a mass proportion Cp of carbon with respect to the entire powder is 0.05% or more, and wherein a mass proportion Cs of carbon contained in a surface portion of the powder with respect to the entire powder is 0.05% or less. Provided is a method for manufacturing silicon nitride powder, the method including: molding a kneaded material containing a silicon powder and an organic binder to obtain a molded body, degreasing the molded body by heating the molded body at 900°C or more and less than 1100°C for 1 hour or more; firing the molded body in a mixed atmosphere containing nitrogen and at least one selected from a group consisting of hydrogen and ammonia to obtain a fired product containing silicon nitride and carbon; and pulverizing the fired product.

The invention relates to the technical field of ceramic materials, and discloses a preparation process for producing hexagonal boron nitride by a low-temperature method, which comprises the following specific steps: mixing borax and urea according to a certain mass ratio, and adding into a ball mill for ball milling to obtain a material A with uniform particle size; adding a modified material with a proper mass ratio into the material A, and continuing ball milling to uniformly disperse the modified material to obtain a material B; transferring the material B into a tubular furnace into which high-purity ammonia gas is introduced, heating to about 900 DEG C at a proper rate, and preserving heat for several hours to complete the reaction; and after the reaction is completed, cooling along with the furnace, washing the product with deionized water until the product is neutral, sieving with a 300-mesh sieve, and carrying out vacuum drying at 70-90 DEG C for a certain time to finally prepare the high-crystallinity hexagonal boron nitride. According to the process, boron-nitrogen reaction kinetics is promoted through the modified material, generation of cubic boron nitride impure phases is inhibited, compared with a traditional high-temperature method, energy consumption is remarkably reduced, product purity and crystallinity are improved, and the process is suitable for large-scale production.

The invention belongs to the technical field of nano material preparation, and particularly relates to a silicon nitride nanowire and a preparation method thereof. Comprising the following steps: (1) mixing vinyl polysilazane and acrylic acid 2-isocyano ethyl ester, and carrying out stirring reaction under a vacuum condition to obtain A-PSZ; (2) the A-PSZ is put into a vacuum drying oven to be subjected to thermocuring treatment, and cured A-PSZ is obtained; (3) putting the cured A-PSZ into a tubular furnace, and introducing N2 to carry out pyrolytic reaction; and (4) taking out the sample after the pyrolytic reaction, collecting a product generated on the surface of the sample, and sequentially carrying out acid washing and alkali washing treatment to finally obtain the silicon nitride nanowire. According to the method, acrylate modified polysilazane is taken as a raw material, precursor pyrolysis and carbon thermal reduction are combined, the prepared silicon nitride nanowire is high in purity and uniform in morphology, meanwhile, a catalyst and a toxic and harmful nitrogen source do not need to be used in the preparation process, and the method is environmentally friendly and suitable for large-scale industrial production.

Provided is a magnetic powder having good high-frequency characteristics with low iron loss and good efficiency even at high frequencies. The present disclosure relates to an α-Fe-containing rare earth-iron-nitrogen-based magnetic powder, including: a core region containing a rare earth R, Fe, and N, where R represents at least one selected from the group consisting of Y, Ce, Pr, Nd, Gd, Tb, Dy, Ho, Er, Tm, Lu, and Sm, and when R contains Sm, Sm constitutes less than 50 atm% of a total R content; and an α-Fe-containing region outside the core region, the α-Fe-containing region containing α-Fe and at least one selected from the group consisting of oxides, nitrides, and oxynitrides of the rare earth R.

The invention provides a bis (fluorosulfonyl) imide purification method which comprises the following steps: 1) mixing a bis (fluorosulfonyl) imide crude product with a solvent, cooling, adding high-purity bis (fluorosulfonyl) imide solid particles as seed crystals, and performing solvent crystallization operation to obtain crystal slurry containing bis (fluorosulfonyl) imide crystals; and 2) carrying out centrifugal separation on the crystal slurry obtained in the step 1) to obtain imidodisulfuryl fluoride crystals and a crystal filtrate, washing the imidodisulfuryl fluoride crystals in the crystal filtrate, adopting liquid high-purity imidodisulfuryl fluoride as a washing agent, and separating and removing a washing solution to obtain a pure imidodisulfuryl fluoride product. According to the recycling process, the production cost for producing the imidodisulfuryl fluoride is reduced, the energy consumption in the production process is also reduced, and meanwhile, a high-quality imidodisulfuryl fluoride product is obtained.

Provided are solid-state hybrid electrolytes. The hybrid electrolytes have a polymeric material layer, which may be a polymer copolymer layer or a gel polymer copolymer layer, disposed on at least a portion of an exterior surface or all of the exterior surfaces of a solid-state electrolyte. A hybrid electrolyte can form an interface with an electrode of an ion-conducting battery that exhibits desirable properties. The solid-state electrolyte can comprise a monolithic SSE body, a mesoporous SSE body, or an inorganic SSE having fibers et strands, which may be aligned. In the case of solid-state electrolytes that have strands, the strands can be formed using a sacrificial template. The hybrid solid-state electrolytes can be used in ion-conducting batteries, which may be flexible, ion-conducting batteries.

To provide silicon-containing aluminum nitride particles, a sintered body, a resin composition, and a method for producing silicon-containing aluminum nitride particles.SOLUTION: Provided are silicon-containing aluminum nitride particles, wherein, when the total of a mass of aluminum and a mass of silicon analyzed from the particles by an inductively coupled plasma optical emission spectrometer and a mass of oxygen and a mass of nitrogen analyzed from the particles by an oxygen-nitrogen analyzer is set to 100 mass%, a total mass ratio of the aluminum and the nitrogen is 90 mass% or more, a mass ratio of the silicon is within a range of 1.5 mass% or more and 10.0 mass% or less, a mass ratio of the oxygen is X mass%, a specific surface area of the particles measured by a BET method is Y 2 / g, and a ratio (X / Y) is within a range of 0.40 or more and 0.85 or less.SELECTED DRAWING: Figure 2

The invention discloses a device and a process for continuously preparing alpha-phase silicon nitride by a precursor method, and relates to the technical field of preparation of alpha-phase silicon nitride. In the process provided by the invention, the raw material silicon tetrachloride directly reacts with liquid ammonia in the reactor in a vaporific form under the action of high-purity nitrogen through an atomizer, and meanwhile, the by-product ammonium chloride solid generated by the reaction can be ensured to be completely dissolved in the liquid ammonia through the reaction temperature and the reaction pressure and by limiting the feed flow ratio of the raw material silicon tetrachloride to the liquid ammonia; the content of ammonium chloride impurities in generated solid material precursor silicon imine is reduced, and the impurity decomposition amount during subsequent calcination is reduced while the product purity is improved.

The invention relates to a multi-airflow alternating temperature calcining device for ultra-long nitride single crystal nanofibers. The multi-airflow alternating temperature calcining device comprises a reaction furnace; the mechanical vacuum pressure gauge and the exhaust port are arranged at the top of the reaction furnace; the reaction furnace chamber is arranged in the reaction furnace; the multi-reaction-zone graphite furnace body is arranged in the reaction furnace chamber and comprises a first low-temperature zone, a second high-temperature zone and a third low-temperature zone which are sequentially arranged from bottom to top and are not in contact with one another; the electromagnetic heating controller is arranged on the periphery of the multi-reaction-area graphite furnace body; the graphite boat is movably arranged in the multi-reaction-area graphite furnace body; the movable alumina crucible is arranged in the graphite boat; the graphite columns are arranged at the top and the bottom of the multi-reaction-zone graphite furnace body; the hydraulic cylinder is connected with the graphite column; and a control assembly. Compared with the prior art, the method has the advantages that the nitridation reaction process can be accurately controlled, the fiber quality and the crystal integrity can be improved, and independent and accurate temperature control can be realized.

The invention discloses a preparation method and application of an ultrathin large-size hexagonal boron nitride nanosheet capable of being produced on a large scale, and belongs to the technical field of two-dimensional material preparation. The method comprises the following steps: 1, preparing a boron nitride dispersion solution; 2, performing ultrasonic oscillation on the boron nitride dispersion liquid by using an ultrasonic processor; 3, stirring the boron nitride dispersion liquid subjected to ultrasonic pretreatment at an ultra-high speed by using a wall breaking machine; and 4, centrifuging the stirred boron nitride, taking supernate, washing and drying to obtain the ultrathin large-size boron nitride nanosheet. The preparation method disclosed by the invention has the characteristics of simplicity, high efficiency, economy, environmental protection, high yield, high reliability, large-scale preparation and the like, and the prepared boron nitride nanosheet has the advantages of large sheet diameter, small thickness, uniform particles, high lattice integrity and the like, and can be applied to the fields of thermal management, energy storage and photoelectrochemistry of electronic devices.

The invention relates to the field of inorganic powder preparation, and particularly discloses a preparation method and application of aluminum nitride powder. The preparation method of the aluminum nitride powder comprises the following steps: (1) by taking water as a dispersion medium, dispersing hydroxyl aluminum oxide and a carbohydrate into the dispersion medium, and then carrying out hydrothermal reaction to obtain a precursor; the precursor has a carbon-coated hydroxyl alumina core-shell structure; (2) calcining the precursor in a nitrogen-containing atmosphere to obtain aluminum nitride powder; wherein the volume equivalent diameter of the aluminum hydroxide is less than 0.82 mu m. By implementing the method, the aluminum nitride powder with high purity and excellent particle size distribution can be obtained.

The invention relates to a preparation method of silicon dioxide-boron nitride nanobelt aerogel, which comprises the following steps: dissolving melamine and boric acid in a co-solvent of tert-butyl alcohol and hot deionized water, stirring and mixing, carrying out ultrasonic treatment, freeze-drying and the like to obtain a melamine-boric acid aerogel precursor, placing the precursor in a tubular furnace, and carrying out vacuum drying to obtain the silicon dioxide-boron nitride nanobelt aerogel. Pyrolyzing in an ammonia gas atmosphere to obtain boron nitride nanobelt aerogel; and placing the boron nitride nanobelt aerogel in a xylene solution containing tetraethoxysilane and silicon tetrachloride, taking out the boron nitride nanobelt aerogel, and drying the boron nitride nanobelt aerogel. And hydrolyzing and pyrolyzing in an inert atmosphere to form a silicon dioxide layer on the surface, thereby obtaining the silicon dioxide-boron nitride nanobelt aerogel. The silicon dioxide and boron nitride nanobelt aerogel is low in density and excellent in mechanical property and oxidation resistance.