88results about How to "Strong ferromagnetism" patented technology

The invention provides a preparation method of magnetic layered molybdenum disulfide nanosheets. The preparation method comprises the following steps that Step1, molybdenum disulfide is added into stripping solvents, and a molybdenum disulfide dispersion liquid with an initial concentration in a ranged of 0.5-2 mg/ml is prepared, the molybdenum disulfide dispersion liquid is conducted ultrasonic dispersion 0.5-8 h at a temperature of 25-35 DEG C, a surface tension rang of the molybdenum disulfide dispersion liquid is 40-65 mJ/m2 tested at a temperature of 25 DEG C; Step2, the molybdenum disulfide dispersion liquid after being ultrasonic dispersed is centrifuged, upper suspensions of the molybdenum disulfide dispersion liquid after being centrifuged is filtered, filter cakes acquired from the upper suspensions are heated to dry in a vacuum drying chamber at a temperature of 60-100 DEG C. By the adoption of a chemical solvent method and an ultrasonic oscillation condition, stripping among atomic layers are conducted, so that the striping and preparation of the two-dimensional layered molybdenum disulfide nanosheets with a strong ferromagnetic performance can be achieved. The preparation is simple in technology, easy to operate, low in cost and high in productivity.

The invention discloses a method for preparing a single-molecular magnet [Dy2(saph)2(NO3)2(CH3OH)4] and relates to a method for preparing a single-molecular magnet. The invention aims at solving the problems that the synthetic method of the conventional rare earth complex single-molecular magnet is low in yield and the synthetic method of the complex is complicated. The method comprises the following steps: dissolving o-aminophenol salicylaldehyde in acetonitrile, thereby obtaining a solution A; dissolving dysprosium nitrate in methanol, thereby obtaining a solution B; mixing the solution A and the solution B, adding a triethylamine solution into the mixed solution, stirring under room temperature condition, thereby obtaining a preform; and volatilizing a solvent out of the preform, thereby obtaining the complex. The [Dy2(saph)2(NO3)2(CH3OH)4] prepared by the method disclosed by the invention is a single-molecular magnet with good ferromagnetic properties, the yield of the preparation method disclosed by the invention is high and is over 52.84 percent, and the synthetic method of the single-molecular magnet is simple and high in repeatability. The invention belongs to the field of preparation of single-molecular magnets.

The invention relates to an automatic knocking robot detection system for detecting flaws in a building structure. The automatic knocking robot detection system comprises a moving module, a control module, an electromagnetic knocking-type flaw detection module and a laser ranging sensor, wherein the moving module comprises a vehicle frame, two wheel frames, four groups of magnetic wheels, two groups of batteries and battery fixing plates, and each group of magnetic wheels comprises eight sheets of strip magnets, one wheel, a right-angle motor and an encoder; the electromagnetic knocking-type flaw detection module comprises a direct current motor, a push rod, a push rod spring, a push-pull type electromagnet, two guide L plates, a nut sleeve, a screw rod, a limit screw, a sensor bracket anda sound sensor; and the control module comprises an analog-to-digital conversion unit, a main control unit, a wireless communication unit, a GPS unit, a motor driving unit, a solid-state relay and aninertial navigation unit. The automatic knocking robot detection system has the characteristics of flexible detection mode, small volume, high maneuverability, more comprehensive detection and the like.

The invention discloses a high-speed railway and a wheel-rail train, which belong to the technical field of track traffic. The high-speed railway is basically characterized in that electric wires of a linear motor are used to substitute a contact net so as to reduce the maintenance work needed by the contact net due to the abrasion; and the safety of the peripheries of the train and the railway is ensured through concrete side rails. The wheel-rail train is basically characterized in that: the train ensures that train wheels and ferromagnetic metal rails do not break away from each other through the mutual attraction of attraction magnets and the metal rails to ensure the safety of the train during high-speed driving. The dispersed arrangement of rotor magnets on the train makes the power dispersed, and the working electric power used on the train comes from a generator driven by the partial train wheels which roll on the wheel rails during the driving. The high-speed railway and the wheel-rail train are novel track traffic technology which is between wheel rail technology and magnetic suspension technology, integrates the advantages of the wheel rail technology and the magnetic suspension technology, is superior to the wheel rail technology and the magnetic suspension technology, and have the advantages of safety, high speed, environmental protection, and the like.

The invention relates to a method for synthesizing magnetic layered composite hydroxide, which is characterized by finishing the preparation of mixed salt solution, coprecipitation by adding a precipitator, primary slurry crystallization, slurry separation, washing and drying treatment under the condition of nitrogen-hydrogen protection. The invention adopts the high purity nitrogen-hydrogen constant flow protection and the forward coprecipitation-primary slurry crystallization technology through the entire process of the preparation of mixed salt solution, addition of precipitators, coprecipitation reaction, crystallization and post treatment aiming at the secondary reactions such as Fe(II) and Fe(OH)2 oxidation, Fe(OH)3 decomposition and the like during dynamics processes of layered composite hydroxide such as precipitation, induced precipitation, compounding, crystallization condensation and the like, thereby avoiding the generation of secondary reactions such as oxidation, decomposition, crystal phase conversion and the like of magnetic LDH and preparing a vector LDH which is combined with magnetism and a layered structure and suitable for the synthesis of magnetic targeting sustained and controlled release preparations. The invention is suitable for the synthesis of magnetic targeting sustained and controlled release drug LDH vector and others specially needing intermediate and high purity LDH crystal phase, and has the advantages of high product purity, high realization rate of target stoichiometric ratio, energy consumption saving, no environment pollution, wide application range and the like.

The invention discloses a preparation method of a single-molecular magnet [Dy2(saph)2Cl2].4CH3OH and relates to the preparation method of the single-molecular magnet [Dy2(saph)2Cl2].4CH3OH, which is used for solving the problems that an existing synthesis method for a rear-earth cluster compound single-molecular magnet is lower in yield, complex in synthesis method of a coordination compound and incapable of carrying out mass production. The preparation method comprises the following steps: I, dissolving o-aminophenol salicylaldehyde acetal into acetonitrile to obtain liquor A; dissolving dysprosium chloride into methanol to obtain liquor B; mixing the liquor A with the liquor B, adding triethylamine with concentration of 0.001mol/L to obtain mixed liquor; II, stirring the mixed liquor obtained in the step I under the room temperature to obtain a preform; and III, volatilizing the preform in the solvent to obtain the single-molecular magnet [Dy2(saph)2Cl2].4CH3OH. The preparation method disclosed by the invention is simple, and high in yield which reaches over 45.76%. The preparation method disclosed by the invention is applied to the field of preparing the single-molecular magnets.

The invention discloses a preparation method of a topological insulator Bi2Se3/FeSe2 alloplasmic structure thin film. The preparation method includes the main steps that a, a FeSe base film is prepared, wherein the FeSe base film is formed on a base sheet through magnetron sputtering; b, FeSe2 annealing phase forming is carried out, wherein the base sheet obtained in the step a and selenium particles are sealed into a vacuum quartz tube with the air pressure smaller than 1*10<-2> Pa, annealing phase forming treatment is carried out, and an FeSe2 thin film is obtained on the base sheet; c, a Bi2Se3 base film is prepared, wherein on the base sheet obtained in the step b, magnetron sputtering is carried out to form a Bi2Se3 film, and then a Bi2Se3/FeSe2 base film is formed on the base sheet; and d, Bi2Se3 annealing phase forming is carried out, wherein the base sheet obtained in the step c and selenium particles are sealed into a vacuum quartz tube with the air pressure small than 1*10<-2> Pa, annealing phase forming treatment is carried out, and the product is obtained. According to the method, the film coating amount is easily controlled, the formed alloplasmic structure thin film is smooth and good in performance. The preparing cost is low.

The utility model discloses a method for preparing the GaMnN diluted magnetic semiconductor nanowire, comprising the following steps: 1) Mn doping: Mn is in-situ doped on the Ga2O3 nanowire; 2) ammonification: the Ga2O3 nanowire doped with the Mn is aminated in the ammonia atmosphere to obtain the GaMnN diluted magnetic semiconductor nanowire. The utility model has the advantages of simple method, low requirement for the equipment, strong ferromagnetism of the prepared GaMnN nanowire, higher Curie temperature than the ambient temperature, controllable magnetic doping concentration, high purity of the nanowire, high output and controllable linear (the nanowire with diameter varying from tens of nanometer to hundreds of nanometer is prepared through adjusting the growing parameters such as air pressure). The utility model is applied for producing the nanometer spin electronic devices, such as spin field effect transistor (spin-FET), spin light emitting diode (spin-LED) and spin resonance tunneling device (spin-RTD) and has broad application prospect.

The invention provides a composite permanent-magnetic material of a motor and a preparation method of the composite permanent-magnetic material. The composite permanent-magnetic material of the motor is formed by a system of Eu, Gd, Fe, Al, P and M, wherein the M is formed by mixing nanoparticles of Fe2O3, Fe3O4, TiC and SiN; the mass ratio of Eu to Gd to Fe to Al to P to M in the system is (5-7) to (5-7) to (60-70) to (2-3) to (1-2) to (5-7); and the mass ratio of the Fe2O3 to the Fe3O4 to the TiC to the SiN in the M is 10 to 5 to 2 to 1. Therefore, the residual magnetism and the magnetic energy product are kept while the coercive force and the high-temperature stability of the permanent-magnetic material are improved, and the cost is effectively reduced.

The invention discloses a preparation method and application of a nanocrystalline high-entropy oxide thin film. The preparation method includes the following steps that first, a metal oxide powder mixture with the purity higher than 99.90% is weighed and put into a mold, then cold press molding is conducted, and cylindrical compact with the diameter being 60 mm and the thickness being 5 mm is made; the cylindrical compact is calcined at the high temperature and then slowly cooled to the room temperature to obtain a mixed oxide target; a monocrystalline silicon (100) substrate material is subjected to ultrasonic cleaning for 5 min by successively using alcohol, acetone and deionized water; the mixed oxide target and the monocrystalline silicon (100) substrate material are subjected to multi-target magnetron sputtering under vacuum conditions, and the vacuum degree is 2.0*10<-4> Pa; and after multi-target magnetron sputtering, the temperature of a vacuum chamber is cooled to the room temperature, and a sputtered thin film is taken out to obtain the nanocrystalline high-entropy oxide thin film. The nanocrystalline high-entropy oxide thin film has high ferromagnetism and high saturation magnetization intensity.

The invention discloses a dry type transformer for deepwater and relates to the technical field of transformers. According to the technical scheme, the dry type transformer for the deepwater comprises an iron core body and coil windings and is characterized in that the iron core body is composed of yokes, roll iron cores and screws. The three roll iron cores are vertically arranged on the same horizontal plane, and the connection lines of the center of the end faces of the three roll iron cores form a triangle. The yokes are in a Y shape, and three protruded portions of the yokes form 120-degree included angles in a pairing mode. The two yokes are clamped at the upper ends and the lower ends of the three roll iron cores, and the three screws are used for integrally fixing the three roll iron cores and the two yokes at the two ends respectively. The three roll iron cores are sleeved with the three coil windings respectively, and outgoing lines of all the coil windings are connected with external cables respectively. An insulating layer is arranged on the surface of a transformer body formed by installing the coil windings on the iron core body. The dry type transformer for the deepwater can be placed in a deepwater area to work, electric power is conveyed to the coil windings of the transformer from the water surface through the cables so as to provide applicable electric power for work in the deepwater, and the dry type transformer for the deepwater has the advantages of being small in size, high in conversion efficiency, strong in insulating property, safe and reliable in work and the like.

The invention provides a carbon nanosheet composite material as well as a preparation method and application thereof. The carbon nanosheet composite material disclosed by the invention is applied to the field of degradation of antibiotic wastewater by an advanced oxidation technology, the degradation efficiency is high, for example, the degradation efficiency of activating persulfate to levofloxacin within 90 minutes reaches 84.87%, the operation is simple, the period is short, the carbon nanosheet composite material is easy to recycle, the condition is mild, the reaction can be performed at normal temperature, special equipment is not needed, the anti-interference capability is strong, and the carbon nanosheet composite material has a wide application prospect in antibiotic wastewater treatment.

The invention provides a method for macroscopic preparation of Fe3O4 nanorods, and relates to the technical field of nanomaterials. The method comprises the following steps: dissolving Fe2SO4.7H2O into distilled water; adding CaSO4.2H2O and then carrying out ultrasonic dispersion to obtain suspension liquid; adjusting the pH value to 7-14, carrying out rapid oxidation reaction, and then filtering and drying the suspension liquid to obtain an alpha-FeOOH/CaSO4.2H2O precursor; carrying out reducing reaction on the alpha-FeOOH/CaSO4.2H2O precursor in reducing gas atmosphere to obtain Fe3O4@CaSO4 composite nano powder; and carrying out post-treatment to obtain the Fe3O4 nanorods. The overall preparation system is easy to build, simple and convenient to operate, low in cost and suitable for large-scale industrial production; the conditions are easy to control; the product composition is easy to control; and the product is uniform in particle size distribution and not easy to aggregate.

The invention relates to a high-magnetic-permeability and low-loss amorphous material for an engine. The amorphous material comprises iron being 70-85% of raw materials, nickel being 0.1-2% of raw materials, cobalt being 0.1-0.6% of raw materials, chromium being 0.01-0.2% of raw materials, and manganese being 0.01-0.2% of raw materials; and the amorphous material uses a quick condensation technology for cooling and curing the raw materials to a solid thin strip with a thin rib shape and a thickness of 0.12-0.2 mm by the speed of 130-180 DEG C/S to form an amorphous alloy to obtain a finished product. Compared with the prior art, the amorphous material has the following advantages: the amorphous material is excellent in ferromagnetism, can reduce 80% of energy consumption generated by steel rolling, improves the magnetic permeability, reduces the magnetic hysteresis loss and the iron loss of the engine, has such characteristics as short production period, high yield, high mechanical strength and good corrosion resistance, and is an upgrading product of a traditional silicon steel sheet.

The invention relates to a heterojunction spinning field effect transistor based on a 4H-SiC substrate, and a manufacturing method for the heterojunction spinning field effect transistor. The method comprises the following steps: selecting the 4H-SiC substrate; growing a Ga2O3 epitaxial layer on the surface of the 4H-SiC substrate through employing the MBE technology; forming a source region and a drain region on the Ga2O3 epitaxial layer through the ion implantation technology; respectively forming a source region ohmic contact electrode and a drain region ohmic contact electrode in the resource region and the drain region; growing an oxidation layer on the Ga2O3 epitaxial layer, and carrying out the etching to form a grid region; forming a Schottky contact grid electrode on the surface of the grid region through the technology of magnetron sputtering, and finally forming the heterojunction spinning field effect transistor based on the4H-SiC substrate. According to the invention, the source and drain regions are formed in a mode of selecting regions and carrying out the implantation of Fe ions. The method is compatible with the conventional technology, is simple in manufacturing, is small in surface effect, and can improve the spinning injection and receiving efficiency.

The invention discloses bismuth ferrite powder and a preparation method thereof. the bismuth ferrite powder is formed by embedding BiFeO3 crystalline particles into BiFeO3 adopting a non-crystalline structure; the BiFeO3 crystalline particles have the diameter of 5-20nm; during preparation, with Bi(NO3)3 or hydrate thereof and Fe(NO3)3 or hydrate thereof as raw materials, the reaction condition and solution concentration are controlled and the BiFeO3 powder is hydrothermally prepared, so that synthesis of the BiFeO3 powder through embedment of the crystalline particles into the non-crystallinestructure is achieved; in addition, the preparation method has the characteristics of no environment pollution, convenient operation, simple equipment, low cost, strong practicability and convenientpopularization and application; the BiFeO3 powder has good ferromagnetic performance, and has a very wide application prospect in the field of sensors, spintronic devices and multifunctional storage.

The invention discloses a magnetic writing wall and a preparation process thereof. The magnetic attraction writing wall is prepared from water-based magnetic attraction tough glaze paint and water-based writing tough glaze paint. The magnetic attraction writing wall is easy to coat and construct, firm in adhesion to various base materials, strong in coating ferromagnetism, high in surface drying speed, excellent in writing erasability, high in scratch resistance and hardness, free of damage during solvent wiping, capable of completely meeting various requirements for whiteboard performance in actual use, capable of completely replacing metal whiteboards and glass whiteboards, reduces waste of financial resources and material resources, reduces unnecessary space occupation, and brings good economic benefits and social benefits into play.

The invention belongs to the field of metal inorganic oxide adsorption material, and discloses nanometer carbon coated cobaltous oxide, and a preparation method and applications thereof. The preparation method comprises following steps: citric acid and cobaltous acetate are dissolved in water through ultrasonic treatment, an obtained mixed solution is dried to be a colloid, the colloid is subjected to roasting treatment at Ar/H2 mixed atmosphere protection through heating to 400 to 500 DEG C, the temperature is reduced to room temperature through cooling, and an obtained product is subjected to grinding to obtain the nanometer carbon coated cobaltous oxide. The preparation process is simple; the raw materials are economical; the preparation method is suitable for large scale production; the obtained nanometer carbon coated cobaltous oxide is short in adsorption balance achievement time in removing of tetracycline, and high in adsorption capacity; and recycling can be realized, and is convenient.