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 relates to a preparation method of a (100) preferred orientation BiFeO3 film, pertaining to the preparation technique of a film material. The invention solves the problems of the prior art for the preparation method of BiFeO3 film, i.e. complicated technique, high cost, high crystallization temperature, low film density, unequal particles distribution, rough surface and no preferred orientation. The preparation steps of the film are that: Fe(NO3)3 and Bi(NO)3 are respectively mixed with acetic acid, and respectively added with glycol solution, and both solutions are mixed and stirred to obtain BiFeO3 sol, and then the BiFeO3 sol is spin-coated to cleaned Pt / Ti / SiO2 / Si substrate, and the substrate is dried, roasted, and is done with crystallization and heat treatment, finally the BiFeO3 film is obtained. The preparation method of the BiFeO3 film of the invention has the advantages of high film quality, (100) preferred orientation, good ferroelectric and ferromagnetic performance, and is suitable for industrialization production.

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 provides a composite sewage treatment agent and a preparation method and application thereof. The preparation method comprises the following steps: S1, preparing chitosan dithiocarbamate; s2, preparing magnetic thick-wall porous titanium dioxide hollow spheres; s3, preparing a nutrient solution; s4, preparing a strain seed solution; s5, preparing a compound microbial agent; s6, preparing the magnetic spheres coated with the chitosan dithiocarbamate; and S7, preparing the composite sewage treatment agent. According to the composite sewage treatment agent, the chitosan dithiocarbamate is wrapped in the hollow spheres so that the composite sewage treatment agent has excellent effects of adsorbing, precipitating and fixing heavy metals, and the titanium dioxide wall material alsohas photocatalytic activity, endocrine interferon, algal toxin, pathogenic microorganisms and the like are effectively removed; microorganisms fixed on the surface can effectively degrade organic pollutants in sewage, and the composite sewage treatment agent also has ferromagnetism, is removed through a magnet after sewage treatment operation is completed, and is safer and more environmentally friendly.

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 invention discloses a preparation method of a magnetically targeted localization magnetic drug carrier, relates to a medicinal preparation with a carrier as characteristic, and particularly relates to a preparation method of a ferrum-filled carbon nanometer tube-nanometer hydroxyapatite in-situ composite magnetically targeted localization magnetic drug carrier. The preparation method comprises the following steps: preparing a ferrum-nanometer hydroxyapatite catalyst; preparing ferrum-filled carbon nanometer tube-nanometer hydroxyapatite in-situ composite powder; preparing purified ferrum-filled carbon nanometer tube-nanometer hydroxyapatite in-situ composite powder; preparing ferrum-filled carbon nanometer tube-nanometer hydroxyapatite in-situ composite magnetic drug carrier powder having covalent functionalization; and preparing ferrum-filled carbon nanometer tube-nanometer hydroxyapatite magnetic drug carrier modified by folic acid and chitosan. With the adoption of the preparation method, the defects such as big toxic and side effects, easy agglomeration and introduction of pollutant during preparation process, limited drug loading capacity, poor ability of magnetically targeted localization and poor stability of the existing magnetic drug carrier are overcome, and the application effect of a magnetically targeted drug delivery system in a tumor patient is improved.

The invention discloses a preparation method and application of a superparamagnetic Fe3O4 nano material, and relates to the technical field of nano materials. The preparation method comprises the following steps: dissolving solid FeCl3.6H2O into distilled water, stirring under room temperature, and fully dissolving, thus obtaining a solution a; slowly adding triethanolamine (TEA) into the solution a, continuously stirring, thus obtaining a brown red solution b, adjusting the pH value of the solution b by ammonia water or solid NaOH, thus obtaining a dark brown solution c, putting the solution c under a closed state for hydrothermal synthesis, and finally taking out a product by a magnetic separation method. The superparamagnetic Fe3O4 nano material prepared by the preparation method disclosed by the invehtion is better in water solubility, good in biocompatibility, high in adsorption performance and excellent in catalysis and magnetic property, can be applied to the fields such as magnetic resonance imaging, data storage, medicament and gene targeting, cell separation and sewage treatment, and has a wider application prospect.

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.

A movable detection robot for a flexible building structure comprises two moving sensing nodes, a flexible steel belt and an acceleration sensor used for achieving vibration detection on the to-be-detected building structure. The two moving sensing nodes are fixedly connected through the flexible steel belt. After the two moving sensing nodes move in the opposite directions, the flexible steel belt is in a downwards-concaved shape, and the lowest downwards-concaved point is close to and is attached to a steel belt on the surface of the to-be-detected building structure. The acceleration sensor is arranged on the bottom face of the flexible steel belt and located at the lowest downwards-concaved position. Each moving sensing node comprises a frame and two magnetic wheels, wherein the two magnetic wheels are arranged on the two sides of the frame and used for being connected with a walking drive device used for driving the magnetic wheels to rotate. Each frame is provided with a wireless communication unit. The movable detection robot for the flexible building structure is flexible in detection manner, low in cost, convenient to carry, capable of effectively eliminating a detection blind area and more comprehensive in detection.

The invention provides a novel Co-doped SrBi2Nb1.8Fe0.2O8.8 multiferroic ceramic material. The invention further provides a preparation method for the ceramic material, which comprises the following steps: SrCO3, Bi2O3, Nb2O5, Fe2O3 and Co2O3 are respectively adopted as materials for preparation; the powder is ball-milled, presintered at 750 DEG C to 850 DEG C for 3 to 5 hours, screening and shaping are carried out, and finally, after sintering is performed for 2 to 4 hours at the temperature of 995 DEG C to 1080 DEG C, the single-phase SrBi2Nb1.8-xFe0.2O8.8-x multiferroic ceramic material with an Aurivillius structure is obtained. The preparation process of the single-phase multiferroic Aurivillius compound ceramic material prepared by the method is simple, the materials are cheap, and the production cost is low. After the doping of Co ions, because more double exchange interaction is introduced, the material is changed from a weak antiferromagnetic material at room temperature into aferromagnetic material.

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 relates to a lanthanum calcium manganese oxygen-lanthanum strontium manganese oxygen-lead strontium titanate composite film and a preparation method thereof. The composite film comprises a lanthanum calcium manganese oxygen film layer, a lanthanum strontium manganese oxygen film layer and a lead strontium titanate film layer which are sequentially stacked on a substrate. The composite film provided by the invention is low in surface roughness, free of micro crack and stable in performance, has the advantages of being good in ferromagnetic property, ferroelectric property and indoor-temperature magnetocapacitance effect and the like, can be compatible with the semiconductor integrated circuit technology, and is high in applicability. The method provided by the invention is cheap in raw material, non-toxic, free of tocix gas emission in the preparation process, and low in environment pollution. The preparation technique is simple, no special equipment is needed, and scale production is facilitated.

The invention discloses a ferromagnetic Co3C@C core-shell nanostructure and a continuous preparation method thereof. The preparation method comprises the steps of sanding the surface of Co elementary substance target with fine abrasive paper until the surface is clean, sequentially ultrasonically cleaning in ethanol solution and acetone solution (each for 8-12min), fixing on a frame of a rotating table, slowly injecting acetone solution and keeping the volume of the acetone solution in a liquid phase laser ablation cavity at 17-25ml, and obtaining Co3C@C core-shell nanostructure by adopting Nd:YAG pulse laser with wavelength of 1064nm and energy of 95-105mJ, and ablating the Co elementary substance target to obtain Co3C@C core-shell nanostructure. The Co3C@C core-shell nanostructure can be continuously prepared for 5-8h. The Co3C@C core-shell nanostructure prepared by the method of the invention has the characteristics of stronger ferromagnetism and fluorescence luminescence dependent on excitation wavelength, and has potential application prospects in magnetic recording and biological medicine.

The embodiment of the invention discloses a preparation method for a diluted magnetic semiconductor material. The method comprises the following steps: an epitaxial layer is prepared on a substrate material, so that a base material is obtained; the base material is then placed in a high-energy ion implanter; first ions are implanted into the epitaxial layer with a first energy and a first dosage,and second ions are then implanted into the epitaxial layer with a second energy and a second dosage, so that a doped material is obtained; and the doped material is placed in a quick annealing oven and is annealed at a first temperature for a first period. Compared with the single-energy state ion implantation method in the prior art, the method provided by the invention has the advantages that dual-energy state ion implantation is adopted, that is, the ions are implanted into a semiconductor substrate with the different energies and the different dosages, so that the magnetic ions can be more uniformly distributed in the longitudinal direction of a diluted magnetic semiconductor film, better ferromagnetic property can be achieved through a lower dosage of the magnetic ions, and the diluted magnetic semiconductor material can be more widely applied in discrete devices and integrated circuits.

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 Ba0.9Ca0.1Ti0.9Zr0.1O3 / Co0.8Ni0.1Zn0.1Fe2O4 layered magnetoelectric composite and a preparation method thereof. After Ba0.9Ca0.1Ti0.9Zr0.1O3 powder and Co0.8Ni0.1Zn0.1Fe2O4 powder are granulated, the Ba0.9Ca0.1Ti0.9Zr0.1O3 powder and the Co0.8Ni0.1Zn0.1Fe2O4 powder are pressed and formed in a mold in a 2-2 compounding layered superimposing arrangement manner, then, a PVA adhesive is discharged, the mixture is sintered at the temperature of 1,100-1,150 DEG C, and the layered magnetoelectric composite is obtained. The Ba0.9Ca0.1Ti0.9Zr0.1O3 powder and the Co0.8Ni0.1Zn0.1Fe2O4 powder are prepared in a 2-2 compounding manner, two phases are sintered in the absence of organic adhesives, the layered composite with the two phases better combined is finally obtained, the reaction between the two phases and mutual dispersion of elements are effectively controlled, and the composite not only has ferroelectric properties and ferromagnetic properties, but also has high magnetoelectric coupling coefficients.

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 GaMnN dilute magnetic semiconductor nanowires. The method of the present invention comprises the following steps: 1) Mn doping: in-situ doping Mn on Ga2O3 nanowires; 2) ammoniation: ammoniating Ga2O3 nanowires doped with Mn under an ammonia atmosphere to obtain GaMnN dilute Magnetic semiconductor nanowires. The method of the invention is simple and requires less equipment, the prepared GaMnN nanowire has strong ferromagnetism, the Curie temperature is higher than room temperature, and its magnetic doping concentration is controllable, the nanowire has high purity, large output, and linear shape control (adjustment of growth parameters such as air pressure can prepare nanowires with a diameter of tens of nanometers to hundreds of nanometers), and can be used for spin field effect transistors (spin-FETs), spin light-emitting diodes (spin-LEDs), and spin resonance The fabrication of nano-spintronic devices such as spin-RTD has broad application prospects.

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.