659 results about "Prepared Material" patented technology

The invention discloses a preparation method of a high-compaction-density lithium iron phosphate material, through grading of large and small particle lithium iron phosphate, optimization of a sintering process and reasonable selection of a carbon source and a titanium dopant, the compaction density and the electrochemical performance of the material are remarkably improved, and the preparation method specifically comprises the following steps: mixing iron phosphate, lithium carbonate, the carbon source and auxiliary materials; the preparation method comprises the following steps: carrying out coarse grinding and fine grinding, respectively preparing large-particle lithium iron phosphate and small-particle lithium iron phosphate (a material A and a material B) by adopting spray drying and high-temperature calcination processes, mixing the material A and the material B according to a ratio, adding auxiliary materials, grinding, further carrying out spray drying, calcining and crushing to obtain a final lithium iron phosphate product, and the maximum compaction density of the prepared material can reach 2.712 g / cm < 3 >. According to the present invention, the maximum 1C discharge specific capacity can achieve 140.5 mAh / g, the maximum 1C 3.2 V discharge platform retention rate is 91.4%, and the prepared lithium ion battery negative electrode material has characteristics of excellent conductivity, high discharge capacity and good cycle stability, and is suitable for power batteries and energy storage batteries.

Provided in the present invention are an optical aluminum alloy and a preparation method therefor. The preparation method comprises: step S1, preparing an aluminum alloy starting ingot from raw materials by using a semi-continuous casting process, the semi-continuous casting process comprising heating and melting, alloying, refining, slagging-off, standing, degassing, filtering and semi-continuous water-cooled casting; step S2, performing homogenization, end cropping and skinning on the aluminum alloy starting ingot, so as to obtain a surface-treated alloy raw material; step S3, carrying out rapid solidification treatment on the surface-treated alloy raw material by means of a melt spinning method to obtain a rapidly solidified alloy strip; step S4, subjecting the rapidly solidified alloy strip to crushing treatment, and then performing encapsulation and cold pressing to obtain a cold-pressed billet; step S5, subjecting the cold-pressed billet to one to two passes of a hot extrusion process to prepare a bar stock; and step S6, carrying out solution treatment and aging treatment on the bar stock to obtain a finished aluminum alloy material. The method can refine the grain structure, and the prepared material can be machined into highly flat surfaces.

The invention relates to the technical field of thermal management material preparation, solves the technical problems of loose heat conduction network structure and non-uniform heat conduction direction of a flexible composite phase change material, and particularly relates to a magnetic polymer-based flexible composite phase change material and a preparation method thereof. Comprising the following steps: preparing a modified polydimethylsiloxane prepolymer from a carbon nanotube dispersion liquid and a polydimethylsiloxane prepolymer; adopting a Pickering emulsion method to mix 42 # paraffin, the modified polydimethylsiloxane prepolymer and nano cellulose to prepare a composite phase change material emulsion; silver mirror reaction is adopted to carry out surface silver plating on the magnetic neodymium iron boron particles; the magnetic polymer-based flexible composite phase change material is prepared from the composite phase change material emulsion and the surface-silvered magnetic neodymium iron boron particles. The high flexibility and magnetism of the prepared material in a normal temperature state endow the material with a more convenient installation mode and lower contact thermal resistance, the heat conduction network structure and component compatibility of the material are improved, and the application requirements of a phase change thermal management technology can be met.

The invention relates to the technical field of refrigeration material preparation, in particular to an efficient passive radiation refrigeration material suitable for a sub-super environment and a preparation method and application of the efficient passive radiation refrigeration material. The method comprises the following steps: uniformly mixing thermoplastic polyurethane, sunlight high-reflection inorganic particles and a phase change material in a solvent; after a chemical foaming agent is added, the obtained suspension liquid is heated and foamed in a confinement mold, and wet gel is formed; and finally, carrying out freeze drying treatment to obtain the composite porous aerogel. The prepared material has a micro-nano porous skeleton formed by TPU, and inorganic particles and PCM are uniformly dispersed in the skeleton wall. Through component cooperation and a special porous structure, the material has extremely high sunlight reflectivity and mid-infrared emissivity, self-adaptive temperature regulation and control are achieved through PCM phase change, the problem that refrigeration of a traditional material fails in the sub-environment such as the vertical surface is effectively solved, and efficient sub-super-environment heat management is achieved.

The invention relates to the field of computers, and provides an optimal design method, device and equipment for a three-dimensional slope inclined anti-slide pile and a medium. The method comprises the following steps: generating a dynamic library file of a soil constitutive model, and importing the dynamic library file into universal interactive modeling software; setting material attributes for the three-dimensional model, defining boundary conditions, and dividing grids; performing static analysis on the three-dimensional model to generate a visual toolkit file; extracting material point information in the visual toolkit file, and packaging the material point information into a material point file; determining pre-prepared material point method three-dimensional data analysis software; reading the material point file and carrying out dynamic analysis; generating an unstructured grid file of the visual toolkit file in the dynamic analysis process; extracting a slope failure state variable from the unstructured grid file of the visual toolkit file; and by taking the slope failure state variable as an optimization target, adjusting the three-dimensional model to obtain an optimal anti-slide pile design scheme.

The invention is suitable for the technical field of solid hydrogen storage, and provides a preparation method and application of a PCN-doped MOF derived nano-porous hydrogen storage composite material. The preparation method comprises the following steps: firstly, synthesizing a cobalt-nickel bimetallic MOF material, and introducing melamine polyphosphate and pentaerythritol ester in the synthesis process; introducing metal vanadium ions to obtain an MOF derivative, and calcining the MOF derivative to obtain the PCN-doped MOF derivative nano-porous hydrogen storage material. And compounding with magnesium hydride to obtain the V-Ni-Co / PCN + MgH2 hydrogen storage composite material. The hydrogen storage capacity of the prepared material reaches 7.0 wt% or above, rapid hydrogen absorption can be started at 40 DEG C, the dehydrogenation starting temperature is reduced to about 150 DEG C, rapid hydrogen absorption / hydrogen desorption is completed within 30 min and 45 min respectively, and excellent hydrogen storage thermal / dynamic performance is shown; after 100 times of hydrogen absorption and desorption cycles, the hydrogen storage capacity retention rate of the material is as high as 97%, and the material shows excellent cycle stability.

The invention discloses a UiO-66-(COOH) 2-Glu composite material for efficient recovery of lithium ions and application of the UiO-66-(COOH) 2-Glu composite material. A preparation method of the UiO-66-(COOH) 2 composite material comprises four steps of preparation of UiO-66-(COOH) 2, drying treatment, amino acid modification and separation and purification. The preparation process comprises the following steps: preparing a precursor UiO-66-(COOH) 2-Glu in an aqueous solution system under mild conditions, carrying out functional modification by introducing glutamic acid, and introducing amino groups and carboxyl groups in amino acid to enhance the selective adsorption performance of the UiO-66-(COOH) 2-Glu composite material on lithium ions, thereby obtaining the UiO-66-(COOH) 2-Glu composite material. The preparation process is green, environment-friendly and low in cost, traditional high-temperature and high-pressure conditions are avoided, the practicability of the material is remarkably improved, and the prepared material shows excellent lithium ion selective adsorption performance and shows excellent performance in the field of rapid recovery of lithium ions.

The invention belongs to the technical field of intelligent high polymer materials, and particularly relates to a preparation method of a quick temperature-sensitive response poly (N-isopropylacrylamide) (PNIPAM)-polyacrylamide (PAM) composite hydrogel. The method comprises the following steps: firstly, copolymerizing carboxymethyl cellulose and N-isopropylacrylamide to obtain a graft polymer, and then reacting the graft polymer with acrylamide to obtain the CMC-PNIPAM-PAM composite hydrogel. The preparation method is low in raw material price and simple and feasible in technological process; the prepared material is rapid in response to temperature change, and the hydrogel is rapidly and reversibly changed from transparent to opaque in the heating process. Besides, by changing the temperature condition in the hydrogel preparation process, the size stability of the hydrogel in the temperature response process can be changed, two kinds of hydrogel with large performance difference are obtained, potential application risks caused by performance failure and structure instability of a gel device in different application environments are avoided, and the application performance of the gel is further improved.

The invention provides a high-entropy-titanium-aluminum alloy and a laser melting deposition preparation method thereof, and relates to the technical field of alloy preparation. According to the method, the high-entropy-titanium-aluminum alloy is prepared through laser melting deposition, and the laser melting deposition has the advantages of being large in temperature gradient and high in cooling speed, so that the prepared material is small in crystal grain, compact in structure and excellent in mechanical property. The titanium-aluminum alloy and the high-entropy alloy are compounded, the overall strength of the alloy is improved, and due to the fact that the titanium-aluminum alloy is low in density, the overall density of the alloy can be reduced, and the requirement for light weight is met. According to the method, the final high-entropy-titanium-aluminum alloy components are changed by changing the powder feeding rates of different powder materials, compared with a laser melting deposition mode that powder with different contents is mixed and then put into a powder feeding barrel, the process of weighing the powder and mechanically mixing the powder is omitted, the method is more flexible in design, and the method is suitable for large-scale industrial production. Alloys with different components can be prepared in batches, and the efficiency is obviously higher than that of a mechanical powder mixing method.

The invention discloses a polyurethane foaming material with a gradient density skin-core structure and a preparation method thereof, and the preparation method comprises the following steps: step 1, injecting a mixed polyurethane foaming raw material into a preheated foaming mold, and closing the mold; step 2, synchronously starting a mold rapid cooling system and an air pressure balance system for foaming and curing when the reaction raw materials are injected; and step 3, taking out the product after curing, standing at room temperature, and curing to obtain the polyurethane foam material. The surface temperature of the mold is suddenly reduced through quenching temperature control so as to form a compact skin layer, and an in-mold pressure curve is controlled by using an air pressure balance program so as to accurately regulate and control foaming of a core layer. The prepared material has a continuous gradient density structure, the skin layer density is high, the core layer density is low, a transition interface with strong binding force is arranged between the skin layer and the core layer, and the extreme performance combination of'hard outside and soft inside 'is successfully realized.

The invention discloses a material for removing organic pollutants in water, a preparation method of the material and a method for treating water. The water treatment material is prepared by organically combining a precursor and an active catalytic component and optimizing and modifying the precursor and the active catalytic component, the preparation method comprises the following steps: pretreating a precursor metal organic framework, etching surface active sites by acid, doping sulfur to improve charge / spin redistribution of a carbon skeleton to regulate and control a coordination environment, and optimizing a material structure by optimizing a coordination structure and material morphology of the treated precursor through thermal derivation. The prepared material is cross-linked and doped to construct an active filter membrane; the method for treating water comprises the steps of heterogeneous activation persulfate water treatment as a catalyst, and coupling filtration and persulfate oxidation as a catalytic filter membrane for water treatment. The material for removing the organic pollutants in the water and the method for treating the water, disclosed by the invention, are excellent in performance and efficient in treatment, integrate various effects of adsorption, catalysis, membrane filtration and the like, and are suitable for water purification treatment.

The utility model relates to the technical field of automatic feeding of bowl-shaped plugs, and discloses an accompanying feeding device of a bowl-shaped plug pressing machine, which comprises a movable feeding mechanism and a fixed material preparation mechanism, the accompanying feeding device of the bowl-shaped plug pressing machine is automatically designed, materials are prepared through the fixed material preparation mechanism, then the prepared materials are added into the movable feeding mechanism, and the movable feeding mechanism and the fixed material preparation mechanism are fixed. In the process that the movable feeding mechanism moves to place a batch of bowl-shaped plugs at designated positions and then press-fitting is conducted through a press, the fixed material preparation mechanism can prepare to add the next batch of bowl-shaped plugs at the same time, continuous operation is achieved, the working efficiency is improved, and the labor cost is reduced.

The invention provides a multifunctional loading system and a control method thereof. The multifunctional loading system comprises a prepared material conveying line; the supporting mechanism is driven by the transverse movement driving mechanism to transversely move; the conveying mechanism is installed on the supporting mechanism, an installation area is formed between the conveying mechanism and the supporting mechanism, the conveying mechanism comprises a plurality of feeding pieces which are driven by a feeding driving mechanism to feed materials towards the corresponding material preparation conveying lines, and containing areas are arranged among the feeding pieces; the steering mechanism comprises a steering frame located in the containing area and lower than the tops of the multiple feeding pieces, a rotation driving mechanism located in the mounting area and used for driving the steering frame to rotate, and a lifting driving mechanism located in the mounting area and used for driving the steering frame to ascend and descend. Through the bogie, goods input to a plurality of feeding pieces can be jacked and steered, the transverse movement driving mechanism is matched to drive the supporting frame to transversely move and position, the function that the conveying mechanism can input the goods into a material preparation conveying line one by one according to different layout modes is achieved, and the adaptability of the loading system is improved.

The invention discloses a preparation method of a material capable of realizing tetracycline adsorption and visible light degradation, and belongs to the field of antibiotic wastewater treatment. According to the combined optimization method, three strategies of doping transition metal nickel on UIO-66, adjusting defects of a manufacturing frame by using monocarboxylic acid benzoic acid and compounding with a black phosphorus sheet layer to construct a heterojunction are implemented at the same time. The integrated nano material which has efficient adsorption performance on tetracycline and realizes photocatalytic removal under visible light is synthesized through a solvothermal method by orderly adding reactants, performing successive ultrasonic compounding and controlling the addition amount of the reactants. The prepared material has high adsorption capacity of 358mg g <-1 > on TC, and can remove more than 99% of the initial concentration of tetracycline hydrochloride after being irradiated and degraded by visible light.

The invention discloses a wire threading mechanism and a wire threading method. The wire threading mechanism comprises a rack and a brush disc. The axis direction of the brush disc is the vertical direction, the brush disc can rotate in the axis direction of the brush disc, and a plurality of screw holes are evenly distributed in the end face of the brush disc in the circumferential direction. A wire conveying mechanism is arranged above the brush disc, a wire cutting mechanism is arranged between the brush disc and the wire conveying mechanism, a wire clamping mechanism is arranged below the brush disc, the wire conveying mechanism, the wire clamping mechanism and the wire clamping mechanism are arranged on the rack in the longitudinal direction, and the size and space occupied by the wire penetrating mechanism are saved; meanwhile, when wire threading is carried out, by means of cooperation of the wire conveying mechanism, the wire clamping mechanism and the wire cutting mechanism, after the prepared material wires are dragged in place, the material wires with the preset length are cut off, wire threading is completed, the efficiency of the wire threading mode is high, and wire threading can be completed one by one at all the wire holes in the brush disc at high efficiency.

The invention discloses a transparent super-hydrophobic cultural relic protection material and a preparation method thereof.The method comprises the steps that firstly, a hydrolyzed silane coupling agent is grafted to the surface of silicon dioxide, then amino of the hydrolyzed silane coupling agent reacts with carboxyl of chain fatty acid, chain alkyl is grafted to the surfaces of silicon dioxide particles, and the transparent super-hydrophobic cultural relic protection material is obtained. The prepared material has excellent super-hydrophobicity, the contact angle of water drops on the surface of a coating is large, the rolling angle of the water drops on the surface of the coating is small, the water drops are difficult to stay on the surface of the coating, and therefore water permeation is effectively prevented. Meanwhile, due to the transparency of the silicon dioxide particles and the chain fatty acid, the coating can keep high transparency, and the original color and pattern of the cultural relic cannot be shielded or changed. The silane coupling agent serves as a bridge for connecting the silicon dioxide particles and the chain fatty acid, the chemical bonding effect in the coating can be enhanced, the coating is not prone to aging and cracking, the material has the advantages of being good in high temperature resistance and ultraviolet light resistance, and therefore the preservation life of the cultural relics is prolonged.

The invention relates to the technical field of adsorption functional materials, in particular to a plant fiber substrate-based instantaneous absorption type damp-proof drying sheet and a preparation method thereof, and the preparation method comprises the following steps: S1, selecting a plant fiber paper base meeting preset flatness and moisture content requirements; s2, the prepared materials are sequentially dispersed in pure water, then a silane coupling agent is added, and the uniform composite adsorption liquid is formed. S3, completely immersing the plant fiber paper base selected in the step S1 into the composite adsorption liquid; s4, the impregnated paper base is firstly subjected to rapid freezing treatment and then transferred into a controlled vacuum environment to be slowly heated; s5, drying the paper base in a constant hot air environment; and S6, the paper base is cut according to the design specification, and a dried sheet finished product is obtained. According to the plant fiber paper-based drying sheet disclosed by the invention, a multi-component composite moisture absorption system is combined with freezing-vacuum lock hole treatment, so that the synergistic improvement of the structural stability and the moisture absorption performance of the plant fiber paper-based drying sheet is realized.

The invention provides a preparation method of a nano super-hydrophobic material. The preparation method comprises the following steps: firstly, selecting nano silicon dioxide particles with the particle size of 20-50 nanometers, and matching the nano silicon dioxide particles with heptadecafluorodecyl trimethoxysilane and other raw materials; the nano silicon dioxide particles are subjected to surface modification for 3-5 hours at 40-60 DEG C by controlling the volume ratio of absolute ethyl alcohol to deionized water to be (3-5): 1 and the mass ratio of the long-chain alkyl silane coupling agent to the nano silicon dioxide particles to be (0.5-1.5): 1. Adding 0.1-0.5% hydrochloric acid or sulfuric acid for catalysis, and stirring at room temperature for 2-4 hours to form a sol-gel system; ultrasonically cleaning the substrate, activating with a sodium hydroxide solution, coating by a spraying, dip-coating or spin-coating method, and drying and curing at 60-80 DEG C for 2-3 hours to obtain a finished product. The water contact angle of the prepared material is not lower than 150 degrees, the rolling angle is not higher than 5 degrees, the performance is stable in the environment with the temperature ranging from-20 DEG C to 80 DEG C and the humidity ranging from 20% to 90%, and the water contact angle is still not lower than 140 degrees after more than 500 times of abrasive paper friction tests.

According to the preparation method and the application of the high-nickel positive electrode material with the core-shell structure, the deep charge-discharge specific capacity and the cycling stability of the layered positive electrode material are remarkably improved by controlling the calcination condition of the high-nickel positive electrode material in an oxygen-free environment, regulating and controlling the oxygen vacancy on the surface of the material and synthesizing the sample with the core-shell structure. Meanwhile, the method is simple, effective and low in cost, and the prepared material is good in morphology uniformity and suitable for large-scale production.

The invention discloses a high-brightness piezoelectric mechanical luminescent material with the chemical formula of LiNbO3: 0.01 Pr, xZn and a preparation method and application thereof, x is larger than 0 and smaller than or equal to 0.02, the preparation process is simple, and the prepared material has the mechanical luminescent characteristics of high brightness, long-term storage and repeatability, can be used as a mechanical luminescent material as a stress distribution visualization material, and can be applied to the field of light emitting devices. Or the optical anti-counterfeiting function can be realized as an anti-tamper label.

The invention discloses a low-salt rapid bamboo shoot fermentation method, which adopts an inoculated fermentation mode, uses lactobacillus plantarum and lactobacillus brevis as leavening agents, and uses fresh bamboo shoots as raw materials. The preparation method comprises the following steps: selecting fresh bamboo shoots with high tenderness, peeling off bamboo shoot shells, cutting off bases, cleaning, and cutting into bamboo shoot slices with uniform sizes; cooking in boiling water for 5 minutes, fishing out, and airing to remove moisture; preparing water with the salt concentration of 2% and the glucose concentration of 2%, boiling the water, and airing the water for later use to obtain a fermentation feed liquid; adding the air-dried fresh bamboo shoot slices and the prepared material liquid into a bag which is scalded by boiling water and cooled according to a solid-to-liquid ratio of 1: 4, and then adding a lactic acid bacteria leavening agent into the fermentation bag for sealed fermentation; and placing the fermentation bag in an environment with a temperature of 30 DEG C for fermentation for 5 days. The prepared fermented bamboo shoots are short in fermentation period, low in nitrite content, mellow and normal in sourness, rich in flavor and high in sensory quality and food safety, and can better meet industrial and consumer requirements.

The invention discloses a covalent organic framework with oxidation-reduction activity and a bionic nano-channel structure as well as a preparation method and application of the covalent organic framework, and belongs to the technical field of environmental protection. According to the preparation method, 2, 4-dihydroxybenzene-1, 3, 5-tricarboxaldehyde and 2, 5-bis (allyloxy) terephthaloyl hydrazine are taken as raw materials, a two-dimensional covalent organic framework with oxidation-reduction activity is synthesized, and then a sulfonic acid group with negative charges is covalently grafted, so that a functional material with a bionic nano-channel structure is formed. The material has regular porous channels and rich functional sites, the porous channels provide efficient mass transfer paths and adsorption spaces for uranyl ions, and the functional sites realize specific recognition of the uranyl ions through oxidation-reduction reaction and electrostatic interaction, so that the material shows synergistic advantages of strong selectivity, high adsorption capacity and rapid adsorption kinetics on uranium. The method is simple and low in cost, and the prepared material is clear in structure, good in hydrophilicity, capable of efficiently adsorbing uranyl ions and good in application prospect.

The present invention discloses a transparent super-hydrophobic cultural relic protection material and a preparation method thereof. The method first grafts a hydrolyzed silane coupling agent onto the surface of silica, and then utilizes the amino group of the hydrolyzed silane coupling agent to react with the carboxyl group of a chain fatty acid to graft a chain alkyl group onto the surface of silica particles. The prepared material has excellent super-hydrophobicity, a large contact angle of water droplets on the coating surface, and a small rolling angle, making it difficult for water droplets to stay on the coating surface, thereby effectively preventing moisture penetration. At the same time, due to the transparency of the silica particles and the chain fatty acid, the coating can maintain a high transparency and will not block or change the original color and pattern of the cultural relic. The silane coupling agent acts as a bridge connecting the silica particles and the chain fatty acid, which can enhance the chemical bonding inside the coating, making the coating less prone to aging and cracking, and giving the material good high-temperature resistance and the advantage of resisting ultraviolet light, thereby extending the preservation life of the cultural relic.

The invention discloses a double-station efficient numerical control processing machine which comprises a material storage bin, two material trays are arranged on the material storage bin, when one material tray is used for processing, the other material tray can synchronously carry out manual material preparation, and when the processed material tray is used up, a system is automatically and seamlessly switched to the material tray with prepared materials for continuous processing. The shutdown waiting time of a production line caused by manual feeding in a traditional mode is thoroughly eliminated, and the overall production efficiency is remarkably improved; meanwhile, a portal frame is arranged above the storage bin, a second moving unit is installed on the portal frame, and the two ends of the second moving unit are connected with mechanical arms. The traditional clamping jaw exchange mode depending on a rotating air cylinder is abandoned, a high-response and high-precision servo motor is adopted to drive a servo rotary table, the rotating angle of a clamping jaw air cylinder is precisely controlled, and the clamping jaw exchange efficiency is improved; high repeated positioning accuracy of the clamping jaw position and accurate positioning of any angle are achieved, it is guaranteed that the clamping jaw can rapidly and accurately reach the preset grabbing position every time, and the grabbing success rate and positioning consistency are greatly improved.

The invention discloses a preparation method of high-toughness physical hydrogel, and belongs to the technical field of hydrogel preparation. The preparation method comprises the following steps: preparing polyvinyl alcohol into a polymer solution, mixing tannic acid and iron ions to prepare a complex solution, blending the two solutions to prepare a flocculation hydrogel of a tannic acid-iron ion complex and polyvinyl alcohol, centrifugally collecting the flocculation hydrogel, pressing the flocculation hydrogel into a sheet material, and drying the sheet material to obtain the tannic acid-iron ion / polyvinyl alcohol composite material. The hydrogel is soaked in a poor solvent for dehydration for mechanical property regulation and control, and then the hydrogel and deionized water are subjected to solvent exchange to obtain the high-strength and high-toughness physical hydrogel. The novel hydrogel material with high strength and high toughness is prepared from cheap and easily available commercial raw materials through a simple blending and efficient mechanical property reinforcing and toughening strategy, and the prepared material realizes unification of strength and toughness, and has important application prospects in multiple fields such as biomimetic materials, flexible electronics and energy.

The invention discloses a layered structure solid oxide fuel cell composite cathode catalyst as well as a preparation method and application thereof, and belongs to the field of solid oxide fuel cells. The invention aims to solve the problem that the electro-catalytic performance and low-oxygen reduction reaction activation energy of the existing medium-temperature solid oxide fuel cell are poor. The Sr2. 9Ca0. 1Fe2O7-CuO composite cathode catalyst is prepared by adopting a sol-gel method and a solid phase method, the components in a sol-gel system are in a nanometer range, the reaction is easier to carry out, the reaction temperature is low, the prepared materials are uniformly mixed, and the sol-gel method is carried out in a solution, so that even if the content of doped elements is very low, the doping can be easily realized; the material is prepared by adopting a solid phase method, and the method has the advantages of convenience in operation, simple synthesis process, uniform particle size, no agglomeration of powder particles, good filling property, low cost, high yield and the like, so that the electrochemical performance of the cathode catalyst is improved, and the method is convenient to operate and suitable for industrial production.

The invention relates to the technical field of wave-absorbing materials, in particular to a broadband wave-absorbing material and a preparation method and application thereof. According to the preparation technology of the wave-absorbing material, a non-woven fabric carrier with graded pores and continuous gradient distribution is constructed by virtue of induction of a centrifugal force field, and then the non-woven fabric carrier is placed in a magnetic dispersion liquid system to be subjected to impregnation ultrasonic dispersion load treatment, so that heterogeneous interface structures are constructed on the surfaces and the interiors of fibers, and the prepared material fabric has the characteristics of light weight and broadband wave-absorbing performance; the method is suitable for military and civil high-tech fields such as electromagnetic protective clothing and invisibility. The method has the advantages of short production period, high raw material utilization rate and the like.

The invention relates to a high-entropy iron-manganese-based transition metal layered oxide positive electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion batteries, and the preparation method comprises the following steps: dissolving an iron source, a copper source, a manganese source and a nickel source in an aqueous solution of ethanol and ethylene glycol to form a first solution; dissolving a precipitator in an aqueous solution of methanol and ethanol to form a second solution; heating a methanol solution in an oil bath, dropwise adding the first solution and the second solution, introducing Ar and H2, adjusting the pH value of the solution, reacting, standing and aging, carrying out solid-liquid separation, washing and drying a product, fully mixing and grinding the product with a sodium supplementing agent, titanium dioxide and an organic solvent, heating in Ar and N2, cooling and rapidly grinding to obtain the positive electrode material. The method is simple in process, good in controllability, cheap in raw material and wide in raw material source, the prepared material is uniform in particle size, uniform in distribution and high in crystallinity, the electronic and ionic conductivity of the material is improved, high reversible capacity and excellent cycling stability are obtained, the cost is reduced, and meanwhile the electrochemical performance of the material is improved.

The invention belongs to the technical field of environmental pollution treatment, and particularly relates to a nitrogen-doped carbon nanotube confinement composite material as well as a preparation method and application thereof. Compared with the prior art, the preparation method has the advantages that the cheap nitrogen source and transition metal salt are used as raw materials, the nitrogen-doped carbon nanotube-coated iron carbide confinement material is creatively synthesized in one step by regulating and controlling the cracking temperature, the metal nanoparticles are effectively coated in the carbon nanotubes, and the preparation method is simple to operate and high in yield. The prepared material has the advantages of large specific surface area, rich catalytic active sites, efficient electron transfer capability, strong magnetism, convenience in recovery and the like, so that the nitrogen-doped carbon nanotube confinement composite material can effectively improve the electron transfer capability of the material, reduce the binding energy between the material and persulfate, and improve the catalytic activity of the material. A reaction system mainly activates persulfate through a free radical path to generate sulfate free radicals and hydroxyl free radicals with higher oxidation-reduction potential, so that perfluoro and polyfluoroalkyl substances are effectively degraded.

The invention relates to the technical field of semiconductor crystal materials, and provides a low-thermal-conductivity Mg-Ag-Sb ternary compound single crystal material and a preparation method thereof. The preparation method comprises the following steps: a raw material weighing step: weighing Mg, Ag, Sb and Bi raw materials according to a set stoichiometric ratio; a packaging step: packaging the raw materials weighed in the raw material weighing step into a packaging container; a single crystal growth step: placing the packaging container in a temperature control device for temperature control, completely melting the raw materials in the packaging container to form a melt, then cooling the melt, forming a crystal blank in the melt, and growing the crystal blank into a single crystal; and a centrifugation step: the temperature of the melt in the packaging container is reduced to a set range, the packaging container is placed in centrifugal equipment for centrifugal treatment, single crystals in the melt are separated, and the Mg-Ag-Sb ternary compound single crystal thermoelectric material is obtained. The preparation method is high in controllability, and the prepared material is high in purity and uniformity and extremely low in heat conductivity.