8 results about "Magnesium boride" patented technology

The invention discloses a near-infrared fluorescent probe based on magnesium boride, a probe product as well as a preparation method and application of the near-infrared fluorescent probe. The near-infrared fluorescent probe based on magnesium boride is of a pH response type and is prepared by a method comprising the following preparation steps: (1) completely dissolving indocyanine green and polyvinylpyrrolidone in a solution to obtain a mixed solution; (2) keeping the mixed solution obtained in the step (1) away from light and continuously mixing for preset time; (3) adding magnesium boride into the system in the step (2), and continuously mixing the system in a preset time under a dark condition, so that the magnesium boride is combined with the indocyanine green and the polyvinylpyrrolidone; (4) centrifuging the solution obtained in the step (3) at 200-300rmp, and taking supernate; then, centrifuging the supernate at the speed of more than or equal to 12,000 rmp, and taking precipitate; and (5) obtaining a powder product from the precipitate obtained in the step (4), thereby obtaining the near-infrared fluorescent probe based on magnesium boride.

The application relates to the technical field of sensors, and particularly discloses a magnesium-based metal ceramic sensitive element for a breathing pump and a preparation method thereof. The sensitive element is prepared by sintering a magnesium-based metal ceramic composition, and the raw materials include a magnesium-zinc-calcium medical magnesium alloy matrix phase, a dual-phase ceramic functional phase compounded by fluorophosphate calcium and magnesium boride, a low-temperature sintering fluxing compatible phase compounded by lithium fluoride and calcium fluoride, a potassium fluozirconate interface bridging modification component and a high-purity indium conductive stabilization component. The sensitive element is prepared through inert atmosphere raw material mixing, drying, powder pre-activation, cold isostatic pressing, double sealing and protection, stepwise low-temperature pulse discharge sintering, forming processing, surface passivation and working condition pre-stabilization treatment. The sensitive element is suitable for medical breathing pump sensing, has good conductivity, creep resistance and biocompatibility, and is suitable for high-frequency alternating working conditions; the preparation method is controllable, can realize low-temperature densification sintering, and guarantees the stability of the element structure and performance.

The invention discloses a method for growing a small-diameter boron nitride nanotube and application of the small-diameter boron nitride nanotube. The method comprises the following steps: applying a catalyst to the surface of the substrate, wherein the catalyst is spatially separated from a boron source; and reacting the catalyst, the boron source, the nitrogen source and the functional carrier by adopting a chemical vapor deposition method to obtain the boron nitride nanotube growing on the substrate. According to the method, the boron nitride tube is grown in a manner of separating the catalyst from the boron source, so that melting agglomeration between magnesium boride catalysts at a high temperature and wrapping of the magnesium boride catalysts by the gaseous boron source are prevented to the greatest extent, the size change of the core catalyst is reduced, and the tube diameter of the boron nitride tube is regulated and controlled by controlling the size of the catalyst; and the obtained boron nitride nanotube integrates small diameter, high quality and directional assembly.

A magnesiumdiboride (MgB2) powder-in-tube (PIT) wire has a cross-section showing —voids, —magnesiumdiboride, and —oxides, as measured by energy-dispersive X-ray spectroscopy. Oxides are located at the borders between the voids and the magnesiumdiboride. The MgB2 PIT wire has a higher degree of superconductivity.

The invention discloses a magnesium-based solid electrolyte interface layer and a preparation method thereof. The magnesium-based solid electrolyte interface layer mainly comprises magnesium boride, and the mass ratio of the magnesium boride in the magnesium-based solid electrolyte interface layer is 20-80 wt.%; a boron-based compound precursor layer is pre-constructed on the surface of a magnesium metal negative electrode by adopting an interface precursor induced in-situ derivation method, and a magnesium-rich boride solid electrolyte interface layer is formed through in-situ conversion after electrochemical circulation; a boron-based compound precursor is subjected to ball milling pretreatment and then introduced into a pre-strain structure, boron elements are continuously released in the circulation process, formation of a magnesium-rich boride interface layer is promoted, the obtained interface layer can serve as a super-ion conductor interface for magnesium ion conduction, and rapid and uniform transmission of magnesium ions is achieved; meanwhile, the precursor in the strain state can also be used as a dynamic boron source storage cavern, continuously participates in interface reconstruction when the interface is damaged, and endows the interface with good self-repairing capability.

The invention discloses a preparation method of a magnesium diboride superconducting wire taking magnesium tetraboride as precursor powder. Magnesium tetraboride is synthesized through the thermal decomposition reaction of magnesium borohydride and boron powder, precious metal elements are doped in the magnesium tetraboride powder, a Mg rod is fixed to the center of an Nb tube on the basis of a center magnesium diffusion method, the space between the Mg rod and the Nb tube is filled with the precious metal-doped magnesium tetraboride powder, a single-core wire is prepared through cold machining, and after the two ends of the wire are flattened, the single-core wire is prepared into the high-strength magnesium alloy. And carrying out primary sintering in a tubular furnace to generate a magnesium diboride superconducting phase, bundling and stacking the primarily sintered wires, and carrying out secondary densification pressure sintering to obtain the magnesium diboride superconducting wire. The magnesium diboride superconducting wire prepared by the method is high in density and free of superconducting harmful phases, so that the magnesium diboride superconducting wire has good superconducting performance. The preparation method disclosed by the invention is simple, required equipment is relatively common, the cost is low, and the preparation method has very strong feasibility in the aspect of actual production and application.

This invention relates to the fields of environmental protection and new energy technologies, specifically disclosing a Pd-supported photothermal catalyst, its preparation method, and its application. The Pd-supported photothermal catalyst comprises a rare earth hexaboride support and Pd nanoparticles. The preparation method of the Pd-supported photothermal catalyst includes: weighing anhydrous rare earth chloride and magnesium boride powder, grinding and mixing them evenly, calcining them under vacuum, and after cooling to room temperature, immersing them in a dilute sulfuric acid solution and stirring, followed by centrifugation, washing, and drying to obtain the rare earth hexaboride support; adding PdCl2 solution and the rare earth hexaboride support to water, stirring until the solution is completely evaporated, calcining, and then reducing with a H2-Ar mixed gas to obtain the Pd-supported photothermal catalyst. This photothermal catalyst enhances the performance of the transition metal Pd in ​​the catalytic reaction of NO hydrogenation to ammonia synthesis through photothermal synergy by loading Pd nanoparticles onto the surface of the rare earth hexaboride support.