100results about How to "Ferromagnetic" patented technology

The invention discloses a method for preparing manganese, nickel codoped bismuth ferrite film by a sol-gel process. The method comprises the steps of weighing material ferric nitrate, bismuth nitrate, manganese acetate and nickel acetate according to a general formula BiFe(1-2x)MnxNixO3 (x is smaller than or equal to 0.05 and greater than or equal to 0.0125); adding glacial acetic acid to agitate for 30 minutes at 80 DEG C; and adding ethylene glycol monomethyl ether to agitate for 180 minutes at room temperature to prepare into a liquid precursor of which the concentration is 0.1-0.2mol / L. The final sample is obtained by preparing a wet film on indium tin oxide / glass or a platinum substrate by a spin-coating method, pre-annealing, finally annealing the film, and repeating the pre-annealing and film annealing processes for 10-20 times. The method has the characteristics that the impurity phase in bismuth ferrite can be effectively restrained; the grain size and the root-mean-square roughness of the film surface are reduced; the insulating property, ferroelectric properties, the ferromagnetic property and the optical property of the sample are improved; and the method is simple in production technology, good in reproducibility, and low in cost.

The invention relates to a preparation method for chromium oxide (Cr2O3) nanometer materials, belonging to the technical field of inorganic material preparation. The preparation method comprises the steps: by taking chromic nitrate as raw materials, firstly carrying out hydrolysis to the chromic nitrate to generate hydrated chromium oxide nano particles through hydrothermal reaction under neutral or acidic conditions, and then the hydrated chromium oxide nano particles is performed with thermal calcination treatment so as to be crystallized into chromium oxide nanometer materials. According to the preparation method, the raw materials are non-toxic and harmless, no reducing agent, surface active agent or precipitating agent are needed, and the prepared nanometer chromium oxide has high purity, good specific surface area and excellent thermal stability. The particle size distribution is even, the chromium oxide nano particles with different particle sizes ranging from 20nm to 200nm can be obtained through simply regulating the acidity or calcination temperature of experiments. The method has low cost, is simple in production technique and easy for industrial large-scale production, and has no generation of chromium-containing wastes in the whole technique, thereby being an environment-friendly and clean method for preparing chromium oxide.

The invention belongs to the field of smart home, in particular to a safety socket for smart home. The safety socket includes a shell, wherein two parallel slots are formed in the shell; the inner bottom surface of each slot is fixedly communicated with a wire; a capacitor is fixedly connected in each slot; the capacitor comprises an upper pole plate, a lower pole plate and a dielectric medium clamped between the upper pole plate and the lower pole plate. The end, located in the slot, of the wire is electrically connected with the upper pole plate, the lower side wall of the upper pole plate is fixedly connected with a memory spring, the other end of the memory spring is fixedly connected with a conducting ball, a gap is formed between the conducting ball and the lower pole plate, and a fixing mechanism is arranged at the lower end of the lower pole plate; a plug matched with the safety socket for the smart home comprises a cover body. When more plugs are connected to the socket and the socket generates heat due to an overload condition, the memory spring contracts, and the conduction ball at the lower end of the memory spring is driven to move in a direction far away from the lower polar plate, so that a circuit is disconnected, and the safety of power utilization is guaranteed.

The invention provides a single-phase oxide multiferroic ceramic with exchange bias effect. The single-phase oxide multiferroic ceramic is as shown in the formula (I): Bi10Fe5.9Co0.1Ti3O30 (I). The single-phase oxide multiferroic ceramic has high Curie temperature, has ferroelectricity and ferromagnetism under the room temperature at the same time, and has intrinsic exchange bias effect. Not only a magnetic field can be regulated and controlled, but also an electric field can be regulated and controlled, the possibility of encoding storage information through the adoption of electric polarization and magnetic polarization at the same is provided, and then a magneto-electric mutual-control nonvolatile storage magnetic medium with ultrahigh storage density becomes possible.

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 discloses a cobalt doping method of rare-magnet broad-forbidden band semiconductor zinc oxide under indoor temperature in the new-typed semiconductor self-cyclone electronic device making domain, which comprises the following steps: adopting solid-phased sintering method to make Co impurity in the ZnO according to certain proportion; proceeding long-time wet-method balling in the agate tank through planetary ball grinder; drying; grinding; sintering; annealing; using inert gas and hydrogen according to certain proportion; annealing doped zinc oxide rare-magnet sediment material; obtaining CoxZn1-xO material with magnet under indoor temperature.

The invention discloses a preparation method of a ferroferric oxide / titanium dioxide magnetic biological activity coating. The preparation method comprises the steps of firstly, utilizing a solvent-thermal method, adopting ethylene glycol as a solvent, adopting 1,6-hexamethylenediamine, ferric trichloride hexahydrate and anhydrous sodium acetate as solutes, reacting in a reaction kettle, and obtaining water-soluble aminated ferroferric oxide magnetic nanoparticles after finishing reaction; secondly, adopting a microplasma oxidation method, adopting water as a solvent, adopting the water-soluble aminated ferroferric oxide magnetic nanoparticles, calcium salt, phosphor salt and weak acid as solutes, and forming an electrolyte solution; and adopting a titanium / titanium alloy sample as an anode and stainless steel as a cathode, adopting a pulse power supply for carrying out microplasma oxidation treatment on the titanium / titanium alloy sample, and after finishing reaction, generating the ferroferric oxide / titanium dioxide magnetic biological activity coating on a surface layer of the titanium / titanium alloy sample. The magnetic material can respond to an external magnetic field, a magnetocaloric effect is produced through the external alternating magnetic field so as to heat up a focus area, and tumor cells are killed, so that the function of bone cancer magnetic hyperthermia is realized.

A solid electrolytic capacitor (A1) includes a porous sintered body (1), anode conduction members (21A, 21B), surface-mounting anode terminals (3A, 3B), and a surface-mounting cathode terminal. The porous sintered body (1) is made of valve metal. The anode conduction members (21A, 21B) are electrically connected to the porous sintered body (1). The anode terminals (3A, 3B) are electrically connected to the anode conduction members (21A, 21B). At least part of the porous sintered body (1) or at least part of the anode conduction members (21A, 21B) is covered with a ferromagnetic member (8).

The invention relates to a dysprosium-doped BiFeO3 multi-ferroic ceramic block and a preparation method thereof and belongs to the field of functional ceramic. The preparation method comprises the following steps: weighting Bi(NO3)3.5H2O, Dy2O3 and Fe(NO3)3.9H2O at a ratio of (1-x):x:1; respectively dissolving in glacial acetic acid, diluted nitric acid and water, heating and stirring; mixing thethree solutions, and then adding citric acid, heating and stirring; after adjusting PH, continuously heating and stirring, thereby obtaining gel; foaming the gel, thereby obtaining aerogel; crushing the aerogel, thereby obtaining powder; pre-processing the powder; making the pre-processed powder into block and sintering; and removing a surface oxide layer, thereby obtaining the B(i1-x)DyxFeO3 multi-ferroic ceramic block, wherein x is equal to 0.03-0.20. The Bi(1-x)DyxFeO3 multi-ferroic ceramic block is single-phase ceramic; the ferroelectricity is enhanced; and when x is equal to 0.05 and 0.07, the ceramic block has ferromagnetism at room temperature.

The invention provides a preparation method of a porous FexCo3-xO4 nanocage, the nanocage and application thereof. In a PVP solution, the morphology of Co-Co PBAs can be effectively modulated by doping iron ions into a precursor solution for preparing cobalt hexacyanocobaltate(III) (Co-Co PBAs). The porous FexCo3-xO4 nanocage can be prepared by calcining the prepared doped FeyCo1-y-Co PBAs, wherein x is equal to 0-1 and the size of the nanocage is 50-300nm. The difference between the FexCo3-xO4 nanocage and the same kind of materials previously reported in the literature lies in that the cobalt content of the doped transitionmetal-oxide nanocage prepared by the method is adjustable and the morphology and size of the nanocage are adjustable. The nanocage can be used as a catalyst of a Fenton reaction and a Fenton-like reaction. By activating PMS, PS or H2O2, active free radical species can be produced for degrading organic pollutants in wastewater.

The invention discloses a method for preparing iron nano-magnetic particles by taking a T4 phage as a template in the field of magnetic recording materials. In the method, the T4 phage obtained by enrichment and the solution of iron chloride are incubated, centrifuged and reduced by utilizing intrinsic structural characteristics of an organism and a molecular recognition function thereof to obtain iron nano-particles which have small particle sizes and high dispersion degrees and are regularly distributed on the capsid surface of the T4 phage, and the prepared iron nano-particles have the characteristics of nonreversible magnetization process, high coercive force and the like, so that the iron nano-particles prepared by the method have wide application prospect in the field of high-intensity magnetic recording materials. Moreover, in the method, a biological nano-structure which exists in nature is directly taken as the template, so that the method has simple preparation processes, moderate reaction conditions and environment friendliness. Since a biological template has the characteristics of self-producing capability, high appearance repeatability and the like, large scale production is easy to realize.

The invention relates to a nano chromium carbide ferrofluid and a preparation method thereof. High-energy ball milling nano magnetic chromium carbide with the particle size between 40nm and 70nm is used as magnetic particles in the ferrofluid, the precursor is prepared through an aqueous solution batching method, and nano chromium carbide is prepared through a direct carbonization method of chromium oxides; nano magnetic chromium carbide is prepared after high-energy ball milling, nano magnetic chromium carbide particles are pre-dispersed in a base solution and subjected to surface modification to obtain the nano chromium carbide ferrofluid. According to the nano chromium carbide ferrofluid and the preparation method thereof, the nano chromium carbide particle size is between 40nm and 70nm, aggregation is not serious, ferromagnetism is provided after high-energy ball milling, the saturated magnetization is 26.04 emu / g, the saturated magnetic field intensity is 4800 Oe, the nano chromium carbide particles have good dispersity and stability in the base solution after surface modification, the ferrofluid saturated magnetization is 4.32 emu / g, and the ferrofluid can be used for ferrofluid sealing, lubrication, damping and the like and can be used in specific environments such as the strong oxidizing environment.

The invention discloses a p-nitrophenol hydrogenated loaded yolk-eggshell nanostructure catalyst and a preparation method thereof. The p-nitrophenol hydrogenated loaded yolk-eggshell nanostructure catalyst is prepared from a carrier and an active component, wherein biomass charcoal is used as the carrier; transition metal is used as the active component; transition metal molecules are dispersed and embedded in a porous biomass charcoal carrier, and a yolk-eggshell structure is formed; the particle diameter of the transition metal molecules is 30 to 90 nm; the loaded mass percentage of the active components is 0.5 to 20 percent, and the mass percentage of the carrier is 75 to 99.5 percent; the particle size of the p-nitrophenol hydrogenated loaded yolk-eggshell nanostructure catalyst is 30to 90 nm, particles are uniformly dispersed on the surface of the biomass charcoal, and a gathering phenomenon does not appear. The carrier and a precursor which are adopted for preparing the p-nitrophenol hydrogenated loaded yolk-eggshell nanostructure catalyst are both low-cost matters, so that the cost of the p-nitrophenol hydrogenated loaded yolk-eggshell nanostructure catalyst can be greatlyreduced; meanwhile, a material has ferromagnetism, separation and collection of products can be carried out by very conveniently using a magnet, and repeated use of the material is facilitated.

The invention takes analytically pure PbO, Bi2O3, NiO and TiO2 as raw materials, solid phase method is adopted to synthesize (1-x)PbTiO3-xBi(Ni1 / 2Ti1 / 2)O3, x is more than or equal to 0.0 and less than or equal to 0.6, PbO, Bi2O3, NiO and TiO2 are calculated and weighed by target x value, the weighed samples are subject to ball milling for 24 hours in ethanol solution, thus the samples are mixed fully, the dried powder is subject to heat preservation at 800-900 DEG C for 3-5 hours, is pressed into pieces after being subject to temperature reduction and cooling and then is subject to heat preservation at 1100-1200 DEG C for 3-12 hours, and cooling is carried out, thus obtaining zero expanding material (1-x)PbTiO3-xBi(Ni1 / 2Ti1 / 2)O3 with multiferric high mechanical properties. The material has zero expanding characteristic at the temperature range of 25-525 DEG C, ferroelectric property, ferromagnetism and high mechanical properties; and preparation technology is simple, and equipment requirement is lower.

The invention provides a preparation method of a BIT-Fe multiferroic ferroelectric ceramic. Bi2O3 (bismuth oxide), TiO2 (titanium dioxide) and Fe2O3 (ferric oxide) are used as raw materials, and the BIT-Fe multiferroic ferroelectric ceramic with a pure phase is prepared by a solid phase method, so that the ceramic has ferroelectricity, ferromagnetism and especially opposite ferromagnetism at the same time, and the BIT-Fe multiferroic ferroelectric ceramic has wide application prospects in spintronics and other fields. The preparation method disclosed by the invention has the characteristics that the preparation technology is simple, the preparation technology meets the requirements of industrialized production, and doped substances are simple and easy to obtain, so that the BIT ceramic has a multiferroic characteristic, the purity of the prepared ceramic is high, the prepared ceramic does not include other sundries or hazardous compounds, such as Pb (plumbum), and the prepared ceramic meets the manufacturing requirements of green electronic materials.

The invention relates to a single-phase multiferroic ceramic material and a preparation method of the single-phase multiferroic ceramic material. The material and the method aim at solving the technical problem of week ferromagnetism of the conventional single-phase multiferroic material bismuth ferrite. A chemical expression of the single-phase multiferroic ceramic material is (1-x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)(Fe0.5Ta0.5)O3, wherein x is equal to 0.2-0.4. The preparation method comprises the steps of performing wet ball-milling on barium carbonate powder, calcium carbonate powder, titanium dioxide powder, ferric oxide powder, tantalum pentoxide powder and zirconium dioxide powder after mixing, putting in a pipe furnace for presintering after drying, then performing the wet ball-milling again, after drying, adding an adhesive agent, pressing into a prefabricated body, and sintering the prefabricated body in the pipe furnace, so as to obtain the single-phase multiferroic ceramic material. The single-phase multiferroic ceramic material is in a tetragonal phase perovskite structure at a room temperature, has ferromagnetism and ferroelectricity simultaneously and can be used for the fields of electricity and electronics.

In one embodiment of the disclosure, a composite material with conductive and ferromagnetic properties is provided. The composite material includes: 5 to 90 parts by weight of a conductive polymer matrix; and 0.1 to 40 parts by weight of iron oxide nanorods, wherein the iron oxide nanorods are ferromagnetic and have a length-to-diameter ratio of larger than 3. In another embodiment, a hybrid slurry is provided. The hybrid slurry includes a conductive polymer, and iron oxide nanorods, wherein the iron oxide nanorods are ferromagnetic and have a length-to-diameter ratio of larger than 3; and a solvent.

The invention relates a three-dimensional azido copper-nickel coordination compound which contains a three-dimensional network structure with a one-dimensional pore canal. A secondary structural unit of the three-dimensional azido copper-nickel coordination compound is a crystal which pertains to a monoclinic system with the space group of C2 / c; an azido-bridged copper-nickel unit forms a one-dimensional chain with which univalent anions of isonicotinic acid is connected to form a three-dimensional network and during the connection process, a one-dimensional pore canal is formed between the anions of isonicotinic acid. The preparation method of the three-dimensional azido copper-nickel coordination compound comprises the steps that isonicotinic acid, copper chloride, nickelous chloride and sodium azide are dissolved in 15ml of water to produce massive crystals of the three-dimensional azido copper-nickel coordination compound through a hydro-thermal reaction. The three-dimensional azido copper-nickel coordination compound has the advantages of magnetism and magnetic variation and can be applied as molecule-based magnetic materials, thus having good application prospect in the field of material science.

The invention discloses Ni-Zn high-strength cupronickel alloy and a preparing method thereof. The Ni-Zn high-strength cupronickel alloy is prepared from, by weight, 20-40 parts of Ni, 30-35 parts of Zn, 20-30 parts of Mn, 12-18 parts of P, 4-7 parts of Fe, 5-15 parts of Al and the balance Cu. The performance of the cupronickel alloy is higher, tensile strength and corrosion resistance can better meet the requirement of artware, the specific color intensity and hardness of cupronickel alloy can be maintained for artware produced in the later stage, and environment friendliness is higher and daily use requirements of people are better met. The cupronickel alloy contains zinc which can be dissolved in copper nickel in a solid state to generate a solution strengthening effect, and corrosion resistance is also realized. The cupronickel alloy has high strength and corrosion resistance, high elasticity, attractive appearance and low price, and cost can be saved.

The invention discloses a preparation method for substituting fluorine for oxygen in bismuth ferrite crystal lattices. The method comprises the following steps of: 1, selecting a utensil made of anticorrosive material as a container, selecting diluted acid as a solvent, weighing nitride of Bi and nitride of Fe in a stoichiometric ratio, adding the nitrides into the solvent in a molar ratio of 1:1, preparing a proper amount of fluorine-containing salt, and adding citric acid into the solution; 2, performing initial reaction on the prepared solution in a water bath for (2.5+ / -0.5) hours with uniform stirring, and drying the reaction product in an oven to obtain powder; and 3, performing decomposition reaction on the obtained powder at the high temperature of 780+ / -15 DEG C for 30+ / -3 minutes, removing impurities, sheeting the decomposed powder, sintering the powder at the high temperature of 810+ / -15 DEG C for 10+ / -2 minutes, and thus obtaining a sample in which F-1 effectively enters BFO crystal lattices. The sample in which the fluorine effectively enters the bismuth ferrite crystal lattices and substitutes the oxygen has ferro-electricity and ferromagnetism, and the other path isprovided for realizing the development of multifunctional electronic devices.

Synthesis of ferromagnetic carbon nanometer tube is disclosed. It includes 1) putting porcelain boat, quartz or single-crystal silicon slice into quartz tube as substrate and putting another porcelain boat with zinc powder into quartz tube as catalytic source; 2) inducing insert gas, inducing hydrogen at 450-550deg.C, inducing carbon source at 500-600deg.C, heating to 750-1000deg.C, and keeping temperature for 15-50 mins; 3) shutting carbon source, shutting hydrogen and insert gas until to room temperature, and collecting products on substrate. It achieves good stability and repeatability.

The invention relates to a semiconductor and provides a ZnO based diluted magnetic semiconductor of one-dimensional mesoporous crystal and a preparation method thereof. The ZnO based diluted magnetic semiconductor of the one-dimensional mesoporous crystal is a transition metal-doped ZnO based one-dimensional mesoporous crystal nanometer material, and has a molecular formula of Zn1-xTMxO, wherein TM is transition metal, and x is the percentage of doped components and equals to 0.01 to 0.10. The preparation method is as follows: dissolving zinc salt in an ionic solution, and heating until the solution is transparent; adding transition metal salt into the solution until the transition metal salt is completely dissolved to obtain a mixed solution; heating and refluxing the mixed solution, naturally cooling down to room temperature, washing obtained precipitate by water and ethanol in order, and drying obtained powder to obtain the ZnO based diluted magnetic semiconductor of the one-dimensional mesoporous crystal with room temperature ferromagnetism. The crystal has the advantages of low growth temperature, simple requirement on equipment, mild reaction condition, nonvolatile solvent, green environment of the whole reaction process and cheap raw material.

The invention discloses a single-phase multiferroic ceramic material and a preparation method thereof, relates to a multiferroic ceramic material and a preparation method thereof, and aims to solve a technical problem of weak magnetic property of the conventional single-phase multiferroic material bismuth ferrite. The single-phase multiferroic ceramic material provided by the invention has a chemical formula of Ba0.7Ca0.3FeTaO3; the preparation method comprises the following steps: mixing barium carbonate, calcium carbonate, iron trioxide and tantalum pentoxide powder; then, wet ball-milling; drying and then placing in a tubular furnace for pre-burning; then, wet ball-milling; drying and then adding a binder for being pressed into a preform; then, sintering the preform in the tubular furnace to obtain the single-phase multiferroic ceramic material. The single-phase multiferroic ceramic material has a tetragonal structure at room temperature, also has ferromagnetism and ferroelectricity, and can be applied to electrical and electronic fields.

The invention discloses a lock catch structure and a magnetic lock. The lock catch structure comprises a lock bottom shell, a lock upper cover fixed to the lock bottom shell, and a lock cylinder located between the lock upper cover and the lock bottom shell. One end of the lock cylinder is movably connected with the lock upper cover. The other end of the lock cylinder is suspended above the lock bottom shell through a first elastic device, the preset distance is formed between the other end of the lock cylinder and the lock bottom shell, and therefore the movable end of a to-be-locked device can be inserted in the preset distance. The lock cylinder is further provided with a clamping structure. The lock upper cover is provided with pins. One end of each pin is connected with the lock upper cover through a second elastic device, and the other end of each pin is matched with the clamping structure. The magnetic lock comprises the lock catch structure and an unlocking magnet, the structure is simple, using is convenient, the unlocking manner is simple but ingenious, and cracking is not easy.

The invention discloses a manufacturing method of induction heating ceramic tableware. The manufacturing method comprises adding a liquid into porcelain clay or pottery clay to obtain ceramic blank clay, adding a liquid into a conductive metal oxide, carrying out stirring to obtain composite conductive metal oxide blank clay, coating the composite conductive metal oxide blank clay with the ceramic blank clay to obtain composite conductive blank clay blocks, putting the composite conductive blank clay blocks into a steel mold, carrying out rolling depression by a rolling depression device to obtain a blank mold, carrying out drying and sintering on the blank mold to obtain a dried blank mold, carrying out shaping sintering on the dried blank mold, carrying out glazing, and carrying out high temperature sintering to obtain the induction heating ceramic tableware. The metal oxide in the induction heating ceramic tableware has magnetism, can induce an external AC electromagnetic field and form eddy currents, has resistance effects of the metal oxide and can realize transformation of the eddy currents into heat so that non-contact heating effects are obtained.

The invention discloses a preparation method of a single-phase ceramic target. The preparation method comprises the steps of weighing raw materials, adding the raw materials into an organic solvent, ball milling and mixing uniformly, then calcining and screening; pressing screened powder into a base, and pre-sintering the base; grinding the pre-sintered base and adding the base into the organic solvent, ball milling and mixing uniformly, pressing the obtained powder to obtain a base, and pre-sintering, wherein the process is performed once or for many times; and sintering the base at a temperature of 1023-1173K to shape the target. Through adoption of the preparation method, time for grinding, calcining and sintering is short, the operation temperature is low, and a sintering additive is not added in sintering. The method has low requirements on equipment, has high preparation efficiency, and can help save energy and lower cost. The invention further discloses the single-phase ceramictarget and application thereof in an electronic device. The prepared ceramic target is uniform and compact, has ferromagnetism at both room temperature and low temperature, and can be used for preparing a film material in the electronic device.

An environment-friendly and energy-saving water jet film removing machine comprises a water storage tank, a high-pressure pump, a high-pressure water pipe and a spray nozzle. The high-pressure pump communicates with the spray nozzle through the high-pressure water pipe. The spray nozzle comprises, by weight, 50-80 parts of tungsten carbide, 2-16 parts of cobalt, 2-9 parts of ruthenium, 1-5 parts of nickel, 1-4 parts of titanium carbide, 1-4 parts of tantalum carbide, 0.5-3 parts of niobium carbide, 0.5-3 parts of chromium carbide, and 4-9 parts of vanadium carbide. The environment-friendly and energy-saving water jet film removing machine has the advantages of being better in compression resistance and abrasion resistance, longer in service life and capable of reducing the using cost.

The invention relates to the technical field of building construction and particularly discloses a novel glass curtain wall with high safety. The point supporting manner is adopted for installing. Thenovel glass curtain wall comprises glass panels, a supporting structure, and point supporting devices fixedly connected with the supporting structure and used for combining corners of the adjacent glass panels. When the connecting corners of the adjacent glass panels are machined, ferromagnetic substance is added. Each point supporting device comprises an inner layer and an outer layer, wherein each outer layer is provided with a cavity for the corners of the glass panels to be inserted, and the inner layer is of a permanent magnetic chuck structure. According to the novel glass curtain wall,for connecting of the glass panels, traditional spiders claw type connection is replaced by a magnetic adsorption manner, the glass curtain wall construction technology is optimized, the constructionperiod is shortened, on this basis, holing does not need to be carried out on the glass panels, the safety of the glass curtain wall is improved, and the service life is prolonged.

The invention relates to a nano vanadium carbide ferrofluid and a preparation method thereof. High-energy ball milling nano magnetic vanadium carbide with the particle size between 30nm and 60nm is used as magnetic particles in the ferrofluid, the precursor is prepared through an aqueous solution batching method, and nano vanadium carbide is prepared through a direct carbonization method of vanadium oxides; nano magnetic vanadium carbide is prepared after high-energy ball milling, nano magnetic vanadium carbide particles are pre-dispersed in a base solution and subjected to surface modification to obtain the nano vanadium carbide ferrofluid. According to the nano vanadium carbide ferrofluid and the preparation method thereof, the nano vanadium carbide particle size is between 30nm and 60nm, aggregation is not serious, ferromagnetism is provided after high-energy ball milling, the saturated magnetization is 48.02 emu / g, the saturated magnetic field intensity is 4000 Oe, the nano vanadium carbide particles have good dispersity and stability in the base solution after surface modification, the ferrofluid saturated magnetization is 6.87 emu / g, and the ferrofluid can be used for ferrofluid sealing, lubrication, damping and the like and can be used in specific environments such as the strong oxidizing environment.