11results about How to "High magnetization" patented technology

The invention relates to a method for controllably preparing a magnetic nanofiber film by current regulation and control magnetic field assisted electrospinning, which comprises the following steps: weighing PAN white powder, dissolving in a DMF organic solvent, continuously stirring by magnetic field force, and carrying out ultrasonic dispersion treatment on the solution by using an ultrasonic cleaner to prepare a uniformly dispersed PAN / DMF solution; adding Fe3O4 nanoparticles and a dispersing agent Triton X-100 with the same amount as the Fe3O4 nanoparticles into the prepared solution, and performing ultrasonic dispersion treatment to form a uniformly dispersed magnetic electrostatic spinning solution; according to the prepared magnetic electrostatic spinning solution, a thin and uniform high-performance magnetic nanofiber sample is prepared through a controllable magnetic field generated by a current control electromagnetic lens to assist an electrostatic spinning device, the thin and uniform high-performance magnetic nanofiber sample is placed in a drying box to be dried, and the thin and uniform high-performance magnetic nanofiber sample with the reduced deposition circle area, the increased thickness, the increased mechanical property, the improved magnetic property and the high-performance magnetic performance is obtained. The average diameter of the nanofibers is reduced and the nanofibers are uniform.

The invention discloses a praseodymium, copper and aluminum co-doped SmCo5-based permanent magnet ribbon and a preparation method thereof, and relates to a rare earth cobalt-based permanent magnet alloy material. According to the preparation method, Pr, Cu and Al are added into SmCo5 series alloy at the same time, the adding proportion of Pr-Cu-Al is regulated and controlled, and the multi-element complex-phase SmCo5-based permanent magnet ribbon with the element composition general formula of SmxPryCozCuuAlv is prepared through melt rapid quenching. According to the SmCo5-based permanent magnet thin strip and the preparation method thereof, the defects that optimization of rare earth elements is neglected when alloy elements are added into an existing similar SmCo5-based permanent magnet thin strip and multi-element co-doping lacks regularity are overcome through the addition mode of simultaneous replacement and addition, coercive force and residual magnetism can be improved at the same time through composite doping, and the coercive force and the residual magnetism can be improved at the same time. And the application of the high-performance permanent magnet in more related electric and magnetic components is facilitated.

The invention discloses a preparation method of a hydrophilic ceftriaxone magnetic molecularly imprinted polymer, which comprises the following steps: by taking magnetic iron-aluminum mixed hydroxide as a carrier, ceftriaxone as a template molecule, 3-amino-1, 2, 4-triazole as a functional monomer, ethylene glycol dimethacrylate as a cross-linking agent, ammonium persulfate as an initiator and water as a pore-foaming agent, preparing the hydrophilic ceftriaxone magnetic molecularly imprinted polymer. And preparing the hydrophilic ceftriaxone magnetic molecularly imprinted polymer. The water-based ceftriaxone magnetic molecularly imprinted polymer has high magnetization intensity and a more stable morphological structure, has good adsorption performance on ceftriaxone, achieves adsorption equilibrium within 30 s, has equilibrium adsorption capacity of 6.30 mg / g, conforms to a quasi-secondary dynamic adsorption model, and can be directly suitable for determination of cephalosporin antibiotics in a water environment.

The invention discloses an overload self-tuning magnetic field energy collector which comprises a packaging shell, a frame, bias magnets, an energy taking coil, a rotating device and a mechanical tuning device, the frame is installed in the packaging shell and serves as a framework to wind the energy taking coil, the bias magnets are arranged in grooves in the two sides of the packaging shell, the rotating device is arranged in the grooves, and the mechanical tuning device is arranged in the packaging shell. A rotating device is mounted in the frame; the mechanical tuning device is arranged on the outer side of the packaging shell, and a tuning magnet is arranged above the mechanical tuning device. According to the overload self-tuning magnetic field energy collector, a permanent magnet material is utilized, a magnetism gathering ring in a traditional current transformer is not needed, space magnetic field energy taking can be achieved, and installation and maintenance are more convenient; and due to the overload self-tuning design, the function of automatically adjusting the resonant frequency in the working process of the system can be realized, the damage to the bearing is reduced, the damage to the system caused by high-current impact can be avoided, and the working bandwidth of the system is effectively increased.

This disclosure provides a rare-earth magnet with improved magnetization compared to previous methods, and a method for manufacturing the same. The disclosure relates to a method for manufacturing a magnetic magnet and a rare-earth magnet obtained by this method. The method includes: preparing a mixture containing a specified magnetic powder and a modifying material powder; mixing the magnetic powder and the modifying material powder to obtain a mixed powder; compressing the mixed powder in a magnetic field to obtain a magnetically shaped body; and sintering the magnetically shaped body under pressure to obtain a sintered body. The magnetic powder comprises a first particle group and a second particle group, where d1μm represents the particle size distribution D of the first particle group. 50 And let d2μm represent the particle size distribution D of the second particle swarm. 50 The d1 and d2 satisfy the relationship 0.350≤d2 / d1≤0.500, and the ratio of the total volume of the first particle group to the total volume of the second particle group is in the range of 9:1 to 4:1.

The present invention discloses a high saturation magnetization zinc-doped nickel ferrite film and a preparation method thereof, which relates to the technical field of magnetic semiconductor film materials. The method comprises the following steps: mixing NiO, ZnO and Fe2O3 polycrystalline powders, using a solid sintering method to obtain a disc-shaped zinc-doped nickel ferrite polycrystalline target; in the presence of a small amount of oxygen, using the zinc-doped nickel ferrite polycrystalline target as a target, and using a pulsed laser deposition method to obtain the film on a MgAl2O4 substrate. The film obtained by the present invention has controllable composition and thickness, has insulating ferrimagnetism, and has a room temperature saturation magnetization of up to 441.62emu / cm 3 , which will help guide the preparation of ferrite thin film materials with room temperature ferrimagnetism and help further promote the development of spin electronic device materials.

The invention discloses a magnetoelectric nano-composite film and a preparation method and application thereof, a nano-composite film material comprises a magnetic phase and an insulating ceramic phase, the magnetic phase comprises magnetic Co nanoparticles, the insulating ceramic phase comprises a MgF2 ceramic matrix, the magnetic Co nanoparticles are uniformly distributed in the MgF2 ceramic matrix, and the spacing between adjacent magnetic Co nanoparticles is in a sub-nanometer level; the three-target sputtering process is adopted, the deposition rate of the film is effectively increased, the Co nano-particles are evenly distributed in the MgF2 ceramic matrix, the distance between the nano-particles is in the sub-nanometer level, the nano-composite structure with the tunneling magnetoelectric effect is formed, and the obtained film is high in magnetization intensity and high in magnetoelectric coupling performance.

The invention discloses a method for synthesizing diol from hemicellulose, which comprises the following steps: adding hemicellulose, a catalyst and deionized water into a reaction kettle, sealing the reaction kettle, replacing and exhausting air in the kettle by using nitrogen, charging hydrogen, pressurizing to 1-10MPa, carrying out closed reaction at 180-290 DEG C for 1-10 hours, and cooling to room temperature to obtain diol, the catalyst is prepared from precursors of Ni, MgO and LaOx, has superparamagnetism, and can be recycled through magnetic separation. The method provided by the invention can be used for preparing various glycols (ethylene glycol, 1, 2-propylene glycol and 1, 2-butanediol) with high added values, the yield of the 1, 2-butanediol is relatively high, and meanwhile, the problems of inactivation and recycling in the recycling process of the catalyst can be solved.

Provided is an Sm-Fe-N-based magnet comprising: first crystal grains containing samarium, iron, and nitrogen and containing 9 at% or more and less than 13 at% of samarium, and second crystal grains containing 13 at% or more of samarium; in the distribution of the average distance between adjacent particles of the second crystal grains, the average distance between adjacent particles having a cumulative frequency of 50% is 7 [mu] m or less, and the average distance between adjacent particles having a cumulative frequency of 90% is 12 [mu] m or less.

The invention discloses a preparation method of a fully-compact high-performance magnet, and belongs to the technical field of magnetic materials. The preparation method comprises the following steps: preparing SmCo5 amorphous or nanocrystalline ribbon alloy and Al-Ni-Co-Cu-Fe-Ce amorphous or nanocrystalline ribbon alloy respectively by adopting a melt rapid quenching method, mixing the amorphous or nanocrystalline ribbon alloy according to a certain mass ratio, performing pre-compression molding in an oriented magnetic field, and then performing in-situ high-pressure torsion heat treatment on the magnet to obtain the final high-density magnet. The method is simple in technological process, easy to operate and beneficial to application of the high-performance composite magnet in more permanent magnet devices so as to meet market requirements.

The invention discloses a two-dimensional black carbon nitride quantum material with room-temperature ferromagnetism as well as a preparation method and application of the two-dimensional black carbon nitride quantum material. The carbon nitride quantum material is a two-dimensional layered amorphous nanosheet, and has a graphite-like phase structure with nitrogen vacancies in a carbon-nitrogen skeleton; the single-layer thickness of the carbon nitride quantum material is 4-15 nm, and the length or width of the carbon nitride quantum material is 1-10 [mu] m; the method comprises the following steps: calcining urea serving as a raw material in air, performing primary annealing and edge quadruple heat treatment, and performing centrifugal washing and low-temperature drying by using absolute ethyl alcohol to obtain the black carbon nitride quantum material, the preparation method disclosed by the invention has the characteristics of simple process, easiness in repetition and low cost; the black carbon nitride prepared by the preparation method disclosed by the invention has the characteristics of high purity, high magnetization intensity, high Curie temperature and strong room-temperature ferromagnetism, and can be applied to the fields of spinning electronic devices, topological quantum devices, magnetic storage and the like.