34results about "Boron" patented technology

This invention in one aspect relates to a method of synthesizing a self-assembled mixed-dimensional heterostructure including 2D metallic borophene and 1D semiconducting armchair-oriented graphene nanoribbons (aGNRs). The method includes depositing boron on a substrate to grow borophene thereon at a substrate temperature in an ultrahigh vacuum (UHV) chamber; sequentially depositing 4,4″-dibromo-p-terphenyl on the borophene grown substrate at room temperature in the UHV chamber to form a composite structure; and controlling multi-step on-surface coupling reactions of the composite structure to self-assemble a borophene / graphene nanoribbon mixed-dimensional heterostructure. The borophene / aGNR lateral heterointerfaces are structurally and electronically abrupt, thus demonstrating atomically well-defined metal-semiconductor heterojunctions.

The application discloses a method and integrated system for enriching lithium and removing boron from salt lake brine, and belongs to the technical field of lithium resource purification. The method comprises the following steps: S1. primary electrodialysis of the salt lake brine to obtain a primary low-boron lithium concentrate and a primary boron-rich dilute solution; S2. reverse osmosis of the primary boron-rich dilute solution to obtain a reverse osmosis concentrate; S3. nanofiltration of the reverse osmosis concentrate to remove boron and obtain a nanofiltration lithium concentrate; S4. mixing of the nanofiltration lithium concentrate and hydrochloric acid and then secondary electrodialysis to obtain a secondary low-boron lithium concentrate; the secondary low-boron lithium concentrate is returned to step S1 and mixed with the salt lake brine; and the water inlet of the primary electrodialysis and the secondary electrodialysis is controlled to have a pH of 7-12. The method provided by the application effectively improves the enrichment and purification efficiency of lithium and the removal efficiency of boron, and is simple and easy to implement. The application further provides an integrated system for implementing the above method.

The present invention provides a self-propagating tunnel kiln device and a method for preparing amorphous boron powder thereof, the self-propagating tunnel kiln device comprising: an automatic feeding system, a self-propagating reaction section, a cooling section, a ventilation system, a pneumatic separation pressure relief valve, a multi-electrode igniter, a strong convection inert gas injection system and a circulating cooling system; the automatic feeding system is connected to the feeding end of the self-propagating reaction section; the discharging end of the self-propagating reaction section is connected to the feeding end of the cooling section; the ventilation system is arranged in the self-propagating reaction section and is connected to the self-propagating reaction section; the pneumatic separation pressure relief valve is arranged on one side of the discharging end of the self-propagating reaction section, and the pneumatic separation pressure relief valve connects the self-propagating reaction section with the external environment; the multi-electrode igniter is arranged on the inner side of the bottom of the self-propagating reaction section; the strong convection inert gas injection system is arranged around the outside of the cooling section and is connected to the cooling section; the circulating cooling system is arranged inside the cooling section. The process of producing amorphous boron powder according to the present invention has strong continuity and low energy consumption.

The application provides a method for separating rare earth and iron aluminum boron from neodymium iron boron calcined material leaching solution. The method provided by the application comprises the following steps: obtaining neodymium iron boron calcined material leaching solution containing rare earth, aluminum, iron and boron based on hydrochloric acid preferential dissolution method, adding an oxidizing agent after adjusting the pH of the leaching solution to 3-5, stirring and reacting, and separating to obtain an iron-containing precipitate and an iron-removed solution; using an organic extractant to extract boron from the iron-removed solution to obtain a boron-containing organic phase and a boron-removed solution; adjusting the pH of the boron-removed solution to 4-5, and then performing deep hydrolysis to remove aluminum, and filtering and separating to obtain an aluminum-containing precipitate and a purified rare earth solution for extracting and separating rare earth; using deionized water or an alkaline solution to back-extract boron from the boron-containing organic phase, recycling the organic phase, and concentrating the back-extraction solution to obtain a boron-containing crystalline product. The method provided by the application can recover boron in the neodymium iron boron calcined material leaching solution, is conducive to the removal of aluminum by hydrolysis and reduces the loss of rare earth, and greatly reduces the environmental pressure and the subsequent wastewater treatment pressure.

The invention belongs to the technical field of surface modification of boron powder, and particularly relates to a process for excessively adding boron powder into an energetic material. The process comprises the following steps: modifying a boron powder raw material by using a phthalic ester coupling agent as a modifier to obtain modified boron powder; the preparation method comprises the following steps: adding stearic acid into an energetic material, heating and mixing, and then adding a surfactant to obtain a mixed solution; and adding the modified boron powder into the mixed solution in batches, and stirring and dispersing until no particles or sedimentation is generated. After the boron powder is modified by the titanate coupling agent, the viscosity of the obtained modified boron powder system is remarkably reduced, and the modified boron powder system has good lubricity and rheological property. When the boron powder is used in an energetic material, the addition amount of the boron powder can be remarkably increased by adding the surfactant into the energetic material such as hydrocarbon fuel. The energy level of the liquid energetic material is improved by adding the modified boron with high energy density, and the maximum addition amount of the boron powder in aviation kerosene can reach 78.6% due to excessive addition of the boron powder in aviation kerosene.

The invention relates to the technical field of a novel negative electrode of a lithium ion battery, in particular to a boron-doped porous carbon gas-phase silicon-carbon composite negative electrode material and a preparation method of the boron-doped porous carbon gas-phase silicon-carbon composite negative electrode material. The boron-doped spherical porous carbon is obtained by template agent mixing, boron source doping, spheroidizing agent and initiator adding, spheroidizing polymerization reaction, impurity removal and drying, and gas-phase etching pore forming. And sequentially depositing silicon in the porous carbon holes and depositing a carbon layer on the surface of the silicon-carbon precursor through two times of chemical vapor deposition to finally prepare the boron-doped porous carbon vapor-phase silicon-carbon composite negative electrode material. The electron conductivity is optimized through boron element doping, a lithium ion transmission channel is improved through a spheroidized porous carbon structure, the rigidity of a matrix is enhanced, and the excellent performance of high magnification, low expansion and long circulation of the material is achieved; the problems that in the prior art, an existing gas-phase silicon-carbon composite negative electrode material is insufficient in rate capability, low in matrix strength and blocked in lithium ion transmission are solved.

The invention relates to a method for extracting boron from boron-containing brine based on polyol two aqueous phases, and the method comprises the following steps: (1) uniformly mixing a boron-containing brine solution, a polyol extraction agent and a first salting-out agent, and carrying out first pH value adjustment to obtain a mixed solution A; (2) carrying out extraction separation on the mixed solution A obtained in the step (1) to obtain a boron-loaded polyol solution and raffinate; (3) uniformly mixing the boron-loaded polyol solution obtained in the step (2), a stripping agent and a second salting-out agent, carrying out second pH value adjustment to obtain a mixed solution B, and carrying out stripping separation to obtain a boron-containing stripping solution and regenerated polyol; according to the method, no organic diluent is used in the extraction and back extraction processes, and the method is environmentally friendly, small in phase interfacial tension, high in phase splitting speed and high in extraction efficiency and has the advantages of being easy to operate, green, efficient and the like.

One or more methods are described for extracting boron. The one or more methods include combining a combination comprising an alcohol, an organic solvent and boron, with an aqueous solution comprising an alkali hydroxide so as to form an organic layer and an aqueous layer. The aqueous layer may be separated from the organic layer.

According to an embodiment of the present disclosure, mass production is possible and production time may be reduced, thus increasing yield. Furthermore, a method and apparatus for manufacturing a nanomaterial, which can manufacture a high-purity nanomaterial are disclosed.

The application provides a method for preparing boronene by vacuum thermal decomposition, which comprises the following steps: ball milling a metal boride block in an inert atmosphere to obtain a metal boride powder; tabletting the metal boride powder to obtain a metal boride flake; vacuum thermal decomposition of the metal boride flake in a vacuum reaction environment; solid-liquid separation of the obtained product after mixing with water to obtain a solid; washing the solid with an acidic solution until neutralization; and freeze-drying to obtain boronene; wherein the metal boride comprises MgB2 and / or AlB2. The method has a low vacuum thermal decomposition temperature, low preparation cost and high production efficiency. The preparation method occurs in a closed vacuum environment, and there is no secondary oxidation problem of raw materials and products, no solid impurity pollution, and the method is green and safe. The prepared boronene has high purity, high yield and uniform size.

The present disclosure relates to a boron powder having two or more peaks in a number distribution, and a peak frequency of a peak 2 having the second highest frequency relative to a peak frequency of a peak 1 having the highest frequency is more than 0.12. It is preferable that the peak diameter of the peak 1 is smaller than the peak diameter of the peak 2.

The invention provides a rectification system and method for producing boron isotopes, and belongs to the technical field of boron isotope preparation. The rectifying system comprises a rectifying tower and a condensing device; the rectifying tower comprises a tower body, a BF3 condenser positioned at the top of the tower body and a reboiler positioned at the bottom of the tower body; the condensing device comprises a liquid nitrogen storage tank and an intermediate condenser, the intermediate condenser is provided with a first heat exchange area and a second heat exchange area, the first heat exchange area is communicated with the second heat exchange area, and the first heat exchange area is configured to be capable of exchanging heat with liquid nitrogen provided by the liquid nitrogen storage tank. After heat exchange, at least part of the gaseous medium located in the first heat exchange area is cooled and liquefied to obtain a liquid medium, the liquid medium is collected to the second heat exchange area, and the second heat exchange area is configured to be capable of conducting heat exchange with gaseous BF3 in the BF3 condenser through the liquid medium; the rectification system can solve the problem that the rectification tower cannot operate normally due to freezing of BF3 in the process of preparing the boron isotope.

Hollow tubes or fibers, methods of making hollow tubes or fibers, and uses thereof. In various examples, a hollow tube or fiber (e.g., a borophene tube or fiber or the like) comprises a single or plurality of single layers of boron atoms, where each single layer is crystalline, comprises χ3, β 12, δ6, α, Pmmn, Pmmm, α-icosohedral, or β-icosohedral phase borophene, comprises hexagonal pyramidal and / or icosahedral unit(s) or group(s), or any combination thereof. In various examples, a method of making a hollow tube or fiber comprises exfoliation (e.g., by mechanically mixing and / or agitation) of a boron precursor, such as, for example, a boron powder or crystal, under pressure. Hollow tubes or fibers can be used in various applications and devices, such as, for example, energy or gas storage, sensing, field emission, thermal conductivity, molecular electronic, structural, fiber / fabric, biomedical, electronic, or molecular electronic, filtration, or catalysis, or the like applications or devices, or in materials, such as, for example, conducing adhesives, or thermal or reinforcing materials.

The invention discloses a Zr-based MOF boron adsorbent as well as a preparation method and application thereof. The prepared Zr-DHTP and Zr-BTEC materials have excellent saturated adsorption capacity, and compared with commercial boron adsorption resin IRA-743, the adsorption capacity of the Zr-DHTP and Zr-BTEC materials is improved by 5.6 times and 8.7 times respectively. In a complex system in which common ions (such as Na, K, Ca2, Mg2 and the like) coexist, the material not only maintains high adsorption capacity, but also shows a synergistic promotion effect, and shows good selective adsorption performance. In addition, the adsorbent shows efficient boron absorption capacity in a real brine system, the adsorption process is stable, and the adsorbent has excellent cyclic regeneration performance. In conclusion, the zirconium-based metal organic framework Zr-MOF boron adsorbent has outstanding performance in the aspects of selective separation and enrichment of boron, can be widely applied to the fields of salt lake brine boron extraction, electro-catalysis, photocatalysis, photoelectrochemical cells, electrode materials, supercapacitors and the like, and has remarkable scientific research value and industrial application prospect.

The invention provides a method for extracting boron in a boron-containing organic phase, and relates to the technical field of boron separation. The extraction method provided by the invention comprises the following steps: mixing a boron-containing organic phase with ammonia water, and carrying out reverse extraction to obtain a boron-containing water phase; and crystallizing and separating the boron-containing water phase to obtain ammonium borate. According to the method, ammonium borate can be directly prepared from the boron-containing organic phase, evaporation, concentration and crystallization can be carried out without consuming energy, the obtained ammonium borate solid can be used as a precursor for subsequently preparing boron-containing compounds such as boric acid, borax or boric oxide, the overall energy consumption is low, the operation is simple, considerable economic benefits and social benefits are achieved, and the method is suitable for industrial production. The large-scale popularization and application prospects are realized.

The application relates to the technical field of batteries, in particular to a sodium titanophosphate negative material, a preparation method thereof and a sodium ion battery. The preparation method of the sodium titanophosphate negative material comprises the following steps: mixing a phosphorus source, a sodium source, a titanium source, a mixed carbon source and a boron source, and then sintering in an inert atmosphere to obtain the sodium titanophosphate negative material; wherein the mixed carbon source comprises at least two different carbon sources. The mixed carbon source composed of at least two different carbon sources is adopted for coating to improve the electronic conductivity of the sodium titanophosphate, so that the coulomb efficiency and the rate performance are improved; the addition of the boron source can improve the stability of the material itself, reduce the occurrence of side reactions, also can serve as a fluxing agent, improve the poor solid-phase crystallinity and the long preparation time, and improve the electrochemical performance of the sodium titanophosphate negative material. The method is simple in operation, low in cost and friendly to the environment.

The application discloses a plant biomass cellulose-based boron adsorbent, which comprises a substrate and a ligand grafted on the substrate, the substrate is cellulose grafted glycidyl methacrylate synthesized based on plant biomass cellulose, and the ligand is selected from any one of N-methyl-D-glucose, tris(hydroxymethyl) aminomethane, glycidyl-functionalized ethylenediamine and aldehyde glucose. A preparation method comprises the following steps: obtaining plant biomass cellulose based on plant biomass material; using plant biomass cellulose and glycidyl methacrylate monomers as raw materials, synthesizing cellulose grafted glycidyl methacrylate by adopting an ATRP method; and grafting polyol ligands onto the cellulose grafted glycidyl methacrylate by a hydrothermal reaction, to obtain the plant biomass cellulose-based boron adsorbent. The synthesis method of the boron adsorbent is green and simple, the cost is low, the adsorption capacity is large, and the method is favorable for large-scale application.

The invention belongs to the field of neutron absorption materials, and particularly relates to a high-hardness neutron absorption boron ball and a preparation method thereof. Polyvinyl alcohol and paraffin are added into boron powder for granulation, and a spherical boron ball prefabricated blank is obtained; in a vacuum environment or an argon environment, raising the temperature from normal temperature to 620-680 DEG C through a vacuum sintering furnace, pre-sintering at the temperature, carrying out self-propagating reaction on the blank, cooling along with the furnace, and then carrying out ball milling and scattering treatment to obtain preformed boron ball particles; and heating to 1200-1300 DEG C in a vacuum sintering furnace in an argon atmosphere or a vacuum environment, sintering at the temperature, cooling along with the furnace, and carrying out autogenous grinding and spheroidizing to obtain the spherical boron balls. The spherical boron ball is high in forming rate and sphericity degree, large in hardness, uniform in size, high in internal density, free of pores and not prone to breakage, and neutron absorption of nuclear reactor control rods, nuclear waste storage and shielding layer filling boron balls through a guide rail or a slide way remotely is achieved.

The present disclosure provides a method for preparing a powder material and an application thereof. The preparation method includes: obtaining an initial alloy ribbon including a matrix phase and a dispersed particle phase by solidifying an alloy melt, and then removing the matrix phase in the initial alloy ribbon while retaining the dispersed particle phase, so as to obtain a powder material composed of original dispersed particle phase. The preparation method of the present disclosure is simple in process and can prepare multiple powder materials of nano-level, sub-micron-level and micro-level. The powder materials have good application prospects in the fields such as catalytic materials, powder metallurgy, composite materials, wave-absorbing materials, sterilization materials, metal injection molding, 3D printing and coating.

The present application relates to the field of carbon materials, in particular to a modified high boron and nitrogen phenolic resin-based material, a preparation method and application thereof. The preparation method is to prepare the modified high boron and nitrogen phenolic resin-based material by co-condensation reaction of a modifier, 3-hydroxyphenylboronic acid and formaldehyde and carbonization. The modifier is selected from one of melamine, melamine OAT waste residue and urea. The present application introduces nitrogen-containing groups into the molecular chain segments of phenolic resin to prepare carbon materials with high boron and nitrogen content and high specific surface area. The preparation method is simple and easy to operate, and the carbon material product shows good electrochemical performance. The modified high boron and nitrogen phenolic resin-based material prepared by the present application can be applied to the field of electrode materials or catalytic materials.

The present disclosure relates to a boron powder having two or more peaks in a number distribution, and a peak frequency of a peak 2 having the second highest frequency relative to a peak frequency of a peak 1 having the highest frequency is more than 0.12. It is preferable that the peak diameter of the peak 1 is smaller than the peak diameter of the peak 2.

The present invention provides a method for removing trace bromine from high-purity boron, comprising the following steps: A) crushing a high-purity boron block to obtain boron powder; B) washing and drying the boron powder, placing it in a boron nitride container within a quartz tube, introducing oxygen, and heating to oxidize the surface of the boron powder; C) introducing nitrogen and heating the container to melt the surface boron oxide; and D) introducing hydrogen to react, with the generated hydrogen bromide discharged from the other end of the quartz tube. The method is simple to operate, pollution-free, highly efficient, easily scalable, and low-cost. The bromine content can be stably reduced to less than 20 ppb, meeting the requirements for use as an MBE source.

A method of synthesizing a layer of two-dimensional material or a stack of layers of two-dimensional material comprises: providing (101) a liquid precursor composition on a flat surface of a liquid metal, the liquid metal being a metal or metal alloy having a melting point of less than or equal to 250° C. at a pressure of 1 atm; and forming (102) at least one layer of material on the surface of the liquid metal from the liquid precursor composition. By forming the layer or stack on the surface of the liquid metal, large layers and stacks which are free of wrinkles and creases may be obtained. Also provided are an apparatus useful for performing the method, and products such as energy storage devices obtainable by the method.

One or more methods are described for extracting boron. The one or more methods include combining a combination comprising an alcohol, an organic solvent and boron, with an aqueous solution comprising an alkali hydroxide so as to form an organic layer and an aqueous layer. The aqueous layer may be separated from the organic layer.

One or more methods are described for extracting boron. The one or more methods include combining a combination comprising an alcohol, an organic solvent and boron, with an aqueous solution comprising an alkali hydroxide so as to form an organic layer and an aqueous layer. The aqueous layer may be separated from the organic layer.

The present application provides a method for preparing borophene using a molten salt method, which comprises: mixing a boron source and a metal salt by ball milling for the first time to obtain a mixture A; adding a molten salt medium to the mixture A and continuing to ball mill for the second time to obtain a mixture B; compacting the mixture B and performing two-stage heating and heat preservation to obtain a borophene precursor; cooling the borophene precursor to room temperature and washing it with an acidic solution until it is neutral, and drying it to obtain borophene. The preparation method is simple in process, low in cost, green and safe, and the borophene obtained has good dispersibility, uniform size and high purity. The present application also provides an application of borophene obtained by the preparation method in the preparation of battery electrode materials and negative electrode modification.

The invention discloses nanocrystallized water-soluble boraene for boron neutron capture therapy and a preparation method and application thereof, and belongs to the field of chemistry and biomedicine.The preparation method comprises the steps that after boron powder is subjected to ball milling nanocrystallization, H2SO4 / H3PO4 mixed acid and KMnO4 are subjected to oxidation treatment, dialysis, purification and freeze-drying are conducted, and the nanocrystallized water-soluble boraene (BO) is obtained. The boron content of the material reaches 65-70%, the particle size is 100-110 nm, and the water solubility is excellent; cytotoxicity experiments show that the biocompatibility is good (the survival rate is gt and 95%), and the hemolysis rate is lt; 1%; the nanocrystallization water-soluble boron alkene has blood safety, and does not cause hemolytic reaction under the condition of 50-200 ppm; the tumor inhibition rate of the cellular level BNCT is higher than that of BPA. According to the invention, the problems of poor targeting property and low water solubility of the existing boron drug are solved, and the efficient application of the nanocrystallization water-soluble boraene in BNCT is realized for the first time.

This invention relates to the field of carbon materials, and particularly to a modified thermoplastic boron phenolic resin-based material, its preparation method, and its applications. The preparation method involves a co-condensation reaction and carbonization of a modifier, 3-hydroxyphenylboronic acid, and formaldehyde under the action of an acidic catalyst to prepare the modified thermoplastic boron phenolic resin-based material. The carbon material prepared by this invention possesses a rich porous structure, a large specific surface area, and a high boron content. The method is simple and suitable for large-scale preparation. Based on these advantages, using the carbon material of this invention to prepare electrode materials or catalytic materials can significantly improve the electrochemical performance of the materials.

The present application provides a kind of amorphous boron powder surface oxide layer removal method and propellant for amorphous boron powder, and amorphous boron powder surface oxide layer removal method includes the following contents: amorphous boron powder with surface coated with oxide layer is added to strong polar solvent, and amorphous boron powder suspension liquid is obtained;In the temperature range of 80-100 ℃, amorphous boron powder suspension liquid is ultrasonically dispersed for 4-6 h, and mechanical stirring is continuously carried out during ultrasonic dispersion, and amorphous boron powder dispersion liquid is obtained;After amorphous boron powder dispersion liquid is filtered, filter cake is obtained, filter cake is washed with low boiling point solution for 1-3 times, and then vacuum drying is carried out in vacuum drying apparatus at room temperature for 24-48 h, and amorphous boron powder removed surface oxide layer is obtained;The method of the present application is simple and controllable, and can be applied to large-scale preparation.The present application can effectively remove most of the oxide layer on the surface of boron powder, improve the purity of boron powder by more than 4%, and help to improve the charging process of boron powder in propellant system.

The invention relates to a two-dimensional boron alkene, a friction nano-generator and a preparation method and application thereof. The preparation method of the two-dimensional boron alkene comprises the following steps: performing ultrasonic stripping on beta-rhombic boron powder dispersion liquid to obtain the two-dimensional boron alkene, the mass of the beta-rhombic boron powder in the beta-rhombic boron powder dispersion liquid is 1-8 g; the power of the ultrasonic stripping is 2-4kW. According to the method, the beta-rhombic boron powder is used as the raw material and is matched with the specific ultrasonic stripping power, the gram-level raw material can be processed at a time to obtain the two-dimensional boron alkene, correspondingly, the two-dimensional boron alkene with the level of at least 100 milligrams can be obtained at a time, and the production efficiency of the two-dimensional boron alkene is greatly improved.