24results about "Boron/borides" patented technology

The invention discloses a PTC ceramic material and a preparation method thereof, and relates to the technical field of PTC, and the PTC ceramic material is prepared from the following components: 50-65 parts of barium titanate, 12-16 parts of lead tetraoxide, 0.1-0.3 part of yttrium oxide, 0.1-0.3 part of lanthanum oxide, 6-15 parts of modified silicon boride, 4-10 parts of aluminum oxide, 1-3 parts of ammonium polyacrylate, and 3-6 parts of polyvinyl alcohol. Through synergistic cooperation of a barium titanate main body and functional fillers such as modified silicon boride, leap-type improvement of the comprehensive performance of the PTC ceramic material is realized, on the basis of maintaining excellent PTC characteristics, the heat conductivity coefficient and the breaking strength of the material are effectively improved, the thermal shock resistance and the mechanical reliability are remarkably enhanced, and the PTC ceramic material has good application prospects. The method is especially suitable for the high-end application fields of automotive electronics, industrial control, high-power LED driving and the like.

To provide a method and an apparatus that enable rehydrogenation after hydrogen release of borohydride composed of (HB)n(n≥4) as a hydrogen storage material so that the borohydride can be used repeatedly and the rehydrogenation can be performed without using a heating process.SOLUTION: A method for using a hydrogen storage material includes a rehydrogenation step of placing a hydrogen desorbed boron given by hydrogen being desorbed from borohydride composed of (HB)n(n≥4) under pressurized hydrogen of 4 MPa or more, whereby hydrogen is recombined with the hydrogen desorbed boron to form the borohydride. The rehydrogenation can be carried out without using a heating process. An exemplary embodiment of the hydrogen storage material is a hydrogen storage material supported on a bendable resin carrier.SELECTED DRAWING: Figure 2

The invention discloses a preparation method of two-dimensional boron hydride alkene, and belongs to the technical field of preparation of two-dimensional nano materials. The method comprises the following steps: dispersing metal boride and purified hydrogen type ion exchange resin in an organic solvent with a DN value of less than 19, and carrying out a sealed reaction under the protection of inert gas; according to the method, through the synergistic effect of the low-DN-value solvent and the purified resin, the ion exchange efficiency is effectively improved, competitive adsorption is avoided, the yield of the two-dimensional boron hydride is made to exceed 70%, and the method is mild in reaction condition, easy and convenient to operate, environmentally friendly and suitable for large-scale preparation.

The present invention relates to a method of preparing composite particles comprising contacting a plurality of particles in a reaction zone with a gas comprising at least 25% by volume of a silicon-containing precursor at a temperature effective to cause deposition of silicon within the pores of the porous particles, wherein during the contacting step, a controlled temperature differential is maintained between the maximum temperature of the interior surface of the reaction zone and the minimum temperature within the plurality of porous particles at the same time.

Methods and assemblies for diffusion-based boriding as provided. The methods include accounting for faster immersion of a sample by applying an additional power to heat the electrolyte prior to immersion and applying a negative bias voltage to the sample to mitigation or eliminate oxidation. A fixture including a sample holder to apply the negative bias voltage is also provided.

The invention discloses a method for preparing a silicon isotope and a boron isotope. The method comprises the following steps: purifying boron powder through a pretreatment process to obtain high-purity boron powder; vacuumizing the reactor to-0.08 MPa to-0.09 MPa, then introducing inert gas to replace air in the reactor, and carrying out reduction reaction on the high-purity boron powder and the high-purity silicon tetrafluoride gas rich in silicon-28 in the reactor to obtain a crude silicon-28 isotope product; the method comprises the following steps: removing impurities from a crude silicon-28 isotope product through plasma zone melting to obtain a silicon-28 isotope product, removing excessive silicon tetrafluoride from generated boron trifluoride gas through a low-temperature rectification process, preparing boron-10 and boron-11 isotopes, and returning the excessive silicon tetrafluoride to a system for recycling. The one-step coupling preparation technology of the silicon and boron isotopes is developed, the silicon-28 isotopic, the boron-10 isotope and the boron-11 isotope are prepared at the same time, efficient directional conversion of the silicon and boron isotopes is achieved, the production cost is further reduced, and the economic benefits of the process are remarkable.

The invention discloses elemental boron B60, a preparation method thereof and a preparation method of Na4B60. The boron elementary substance B60 disclosed by the invention is characterized in that the crystal structure of the boron elementary substance B60 belongs to an Ima space group, a structural framework of each unit cell is formed by four B12 icosahedrons on average, and gaps among the four B12 icosahedrons are filled with the rest 12 B atoms. The invention also relates to a preparation method of the boron simple substance B60, which comprises the step of synthesizing the boron simple substance at 400-1000 DEG C under a vacuum condition by using Na4B60 as a raw material. The invention also relates to a preparation method of the Na4B60, which comprises the step of enabling a boron simple substance, a sodium simple substance and a zinc simple substance to react at the pressure of 0.5 GPa or higher and the temperature of 1000 DEG C or higher to obtain the Na4B60. The method is simple in process, low in cost and suitable for large-scale production. The obtained boron simple substance has the advantages of high purity, narrow optical band gap, high conductivity, high nanoindentation hardness and unique plastic deformation capacity, and has application potential in the fields of electronic devices, high-temperature ceramics and the like.

The invention relates to a solid material obtainable by melt quenching a mixture of lithium sulfide, boron sulfide, boron oxide and a lithium halide to form a glassy solid suitable for use as a lithium ion conductive electrolyte. These sulfide-based lithium ion conductive solid electrolytes exhibit high ionic conductivity.

The invention relates to a continuous separation production device for 10B isotope, which comprises a complexing tower for complexing a complexing agent and boron trifluoride and providing tower top reflux for an exchange tower group; the falling film cracking reactor is used for cracking the boron trifluoride-anisole complex, separating to obtain enriched < 10 > BF3 and providing tower bottom reflux for the exchange tower group; the exchange tower group is used for exchanging, enriching and separating < 11 > B in boron trifluoride and < 10 > B in boron trifluoride in a complex; and the natural abundance boron trifluoride gas raw material channel is laterally communicated with the tower bottom of the first exchange tower. The connection of the exchange towers in the device is relatively special, the liquid phase of the device flows according to the cross flow of 1-3-2-4 of the exchange towers, the effect of increasing the abundance gradient of liquid-phase and gas-phase 10B isotopes between the exchange towers is achieved, the chemical exchange mass transfer driving force is improved, the separation efficiency is improved, the balance time is shortened, and the separation efficiency is improved. The abundance of the obtained 10B isotope is higher, and the maximum abundance reaches 97% or above.

The invention relates to a process for preparing composite particles, the process comprising contacting the plurality of particles in the reaction zone with a gas comprising at least 25 vol % of a silicon-containing precursor at a temperature effective to cause deposition of silicon in the pores of the porous particles. A controlled temperature differential between the maximum temperature of the internal surfaces of the reaction zone and the simultaneous minimum temperature within the plurality of porous particles is maintained during the contacting step.

Methods for growing a single crystal ingot using a freeze dried dopant include adding semiconductor material to a crucible of an ingot puller, heating the semiconductor material to form a melt, adding a freeze dried dopant to the melt, and pulling a single crystal ingot from the melt. A doping concentration of the single crystal ingot is controlled using the freeze dried dopant.

The invention provides a combined extraction process of boron, rubidium and cesium in oilfield brine, which adopts a process enhanced coupling extraction method, solves the problem of packing blockage of a traditional extraction tower by using supergravity, enhances liquid-liquid two-phase mass transfer and shortens the retention time of fluid, thereby simplifying the traditional extraction process and realizing the unification of short process and high extraction rate. The process realizes separation and extraction of boron, cesium and rubidium elements in the oil field brine lithium extraction tail liquid, and has the characteristics of long service life of equipment, low process flow cost, easiness in industrialization and environmental protection.

Methods of synthesizing orthorhombic-structure closo-hydroborate include mixing orthorhombic-structure closo-hydroborate precursors with low shear mixing to form a precursor mixture, placing the precursor mixture in a reaction vessel with an inert environment, heating the precursor mixture to a reaction temperature for the precursor mixture, and quenching the reaction vessel from the reaction temperature. The resulting orthorhombic-structure closo-hydroborate has ionic conductive stability at 25°C. Cathode composites that include the orthorhombic- structure closo-hydroborate therein are disclosed as well as solid-state batteries or all-solid-state batteries that have the orthorhombic-structure closo-hydroborate made according to the methods as a solid electrolyte and / or as part of the cathode composite.

The present invention relates to solid materials which are obtainable by melt-quenching mixtures of lithium sulphide, boron sulphide, boron oxide and lithium halides, thereby forming a glassy solid which is suitable for use as a lithium-ion conducting electrolyte. These sulphide based lithium-ion conducting solid electrolytes exhibit a high ionic conductivity.

The application discloses a high-entropy boride-coated cobalt-free high-nickel layered positive electrode material and a preparation method and application thereof, and belongs to the technical field of preparation of lithium ion battery positive electrode materials. First, the high-entropy boride prepared by the above method is mixed, stirred and high-temperature sintered with the cobalt-free high-nickel layered positive electrode material to obtain the high-entropy boride-coated cobalt-free high-nickel layered positive electrode material. The high hardness, high stability and excellent electrochemical performance of the high-entropy boride can avoid direct contact between the positive electrode material and electrolyte, reduce the occurrence of side reactions, effectively relieve the volume change of the cobalt-free high-nickel ternary positive electrode material during the charging process, reduce the intracrystalline and intercrystalline cracks, eliminate the trace surface residual lithium of the cobalt-free high-nickel layered positive electrode material, reduce the surface acidity and alkalinity of the material, and the material is used in a lithium ion battery, so that the initial discharge capacity and cycle stability of the battery are improved.

The application belongs to the technical field of sodium ion batteries, and particularly relates to a sodium ion battery composite positive electrode material and a preparation method thereof. The preparation method comprises the following steps: dissolving soluble nickel salt, iron salt and manganese salt in an ammonia water solution, adjusting pH to 11-12, heating and reacting under a nitrogen atmosphere, and obtaining an oxide precursor after filtration, washing and drying; adding sodium carbonate, the oxide precursor, modified silicon hexaboride and niobium sulfoselenide into ethanol, ball-milling and mixing, drying, calcining and cooling to obtain the sodium ion battery composite positive electrode material. The sodium ion battery composite positive electrode material prepared by the application has high specific capacity, good rate performance and excellent cycle stability.

The application belongs to the technical field of lithium purification, and relates to a method for comprehensive development and utilization of magnesium sulfate sub-type salt lake resources, which comprises the following steps: adjusting the SO4 2‑ concentration and the molar ratio of Mg 2+ , SO4 2‑ in the composition of brine to be treated to preferentially precipitate K + and realize concentration and enrichment of lithium and boron elements in the salt lake brine. The application can make the brine directly precipitate potassium salt during concentration by controlling the SO4 2‑ concentration and the molar ratio of Mg 2+ , SO4 2‑ , realize separation of potassium element from the brine, and avoid precipitation of lithium element in the form of lithium sulfate by controlling the SO4 2‑ concentration in the composition of the salt lake brine, thereby improving the purity of potassium salt and the subsequent lithium element yield, solving the problem of loss of lithium in the form of lithium sulfate precipitate when the brine with a molar ratio of Mg 2+ , SO4 2‑ <4 is collected in the prior art, and the process does not need to remove magnesium, so that the loss of boron element is small, and effective recovery of boron element is realized.

An apparatus includes a boiler configured to receive water, sodium hydroxide, and aluminum; a generator adjacent to the boiler and configured to generate electricity based on heat received from the boiler; a transformer electrically coupled with the generator; a hydrogen capture system coupled with the boiler and configured to capture hydrogen from the boiler; a carbon capture system coupled with the hydrogen capture system to produce hydrocarbons on-site; a nitrogen capture system coupled with the hydrogen capture system to produce ammonia on-site; and a boron 11 containment system coupled with the hydrogen capture system to produce hydrogen boron on-site.

This invention discloses a one-step electrochemical synthesis method for two-dimensional graphene and borene / tellurene composites, comprising the following steps: placing a graphite electrode and a boron / tellurene block electrode as the anode and cathode, respectively, in an electrolyte; connecting a power source to the cathode and anode to form an electrolytic cell structure; electrolyzing at a constant voltage of 5–20V for 30 min–100 h under stirring; then washing and centrifuging to obtain a solution of two-dimensional graphene and borene / tellurene composites, or washing and drying to obtain the two-dimensional graphene and borene / tellurene composites. This invention reduces the possibility of material contamination, improves synthesis efficiency, and enhances the bonding between the two two-dimensional materials, thereby effectively improving the electrical properties of borene / tellurene and providing the possibility of fully exhibiting its inherent properties. This method is simple, low-cost, environmentally friendly, efficient, and suitable for large-scale synthesis.

Aspects of the present disclosure are directed to methods, compositions, and kits for detection and analysis of DNA and RNA modifications, such as DNA and RNA nucleobase methylation. Certain aspects include methods, compositions and kits useful in sequencing of methylated nucleic acids, including methylated nucleic acids from low-input samples such as cell-free DNA and cell-free RNA. Certain aspects include novel N-nitrosation strategies for deamination of DNA and RNA biological macromolecules under mild conditions. In some aspects, provided are compositions, methods, and kits comprising means for cooperative catalysis of a carbonyl organocatalyst with a Lewis acid to facilitate the formation of a C-nitro intermediate from a primary amine, which, upon rearrangement into N-nitrosamine, leads to selective deamination of unsubstituted canonical DNA and RNA bases under mild conditions.

The invention relates to a process for preparing composite particles, the process comprising contacting the plurality of particles in the reaction zone with a gas comprising at least 25 vol % of a silicon-containing precursor at a temperature effective to cause deposition of silicon in the pores of the porous particles. A controlled temperature differential between the maximum temperature of the internal surfaces of the reaction zone and the simultaneous minimum temperature within the plurality of porous particles is maintained during the contacting step.

The present invention relates to a solid material that can be obtained by melt-quenching a mixture of lithium sulfide, boron sulfide, boron oxide, and lithium halide, thereby forming a glassy solid suitable for use as a lithium-ion conductive electrolyte. These sulfide-based lithium-ion conductive solid electrolytes exhibit high ionic conductivity.

The invention discloses a movable boron adding device for boron preparation of a nuclear power plant, relates to the technical field of operation supply systems, and aims to solve the problems that the boron preparation time is relatively long in the boron preparation operation process of the existing nuclear power plant, boric acid is poured by personnel in high-altitude load-bearing operation, boric acid solid dust splashes, and boric acid powder agglomerates to influence the boron preparation efficiency. The device comprises a boron preparing and dosing device part and a boric acid tank cart, the boron preparing and dosing device part comprises a boron adding bin of a trapezoidal bevel structure, the boron adding bin is further connected with a boron adding bin supporting rod, the bottom of the boron adding bin is connected with a boric acid conveying component through a discharging device, and a variable frequency motor is further arranged between the discharging component and the boric acid conveying component; the boric acid tank is fixed on the roll-over stand of the boric acid tank cart through the clamping and fixing clamp, the roll-over stand is connected with the lifting table through a rotating shaft at the front part of the lifting table, and the lifting table is mounted on the movable frame and can lift on the boric acid tank cart.

The invention relates to a process for preparing composite particles, the process comprising contacting the plurality of particles in the reaction zone with a gas comprising at least 25 vol % of a silicon-containing precursor at a temperature effective to cause deposition of silicon in the pores of the porous particles. A controlled temperature differential between the maximum temperature of the internal surfaces of the reaction zone and the simultaneous minimum temperature within the plurality of porous particles is maintained during the contacting step.