1229 results about "Ultrasonic dispersion" patented technology

The invention discloses a supported double perovskite photocatalytic material which is prepared by the following steps: putting copper nanoparticles and double perovskite Cs2NaBiCl6 into a water-absolute ethyl alcohol mixed solution, carrying out ultrasonic dispersion, heating the dispersion solution to 55-65 DEG C, carrying out cooling crystallization at a rate of 1-2 DEG C / min, completing the reaction when the temperature is reduced to 25 DEG C, carrying out solid-liquid separation on the reaction product, and washing and drying the solid, the Cu nanoparticle-loaded double-perovskite photocatalytic material is applied to photocatalytic reduction of CO2, the catalyst has the characteristics of high reduction catalysis efficiency and good selectivity, the performance is stable after repeated cyclic utilization, and the material disclosed by the invention is simple in preparation process, high in efficiency and suitable for large-scale production and market popularization and application.

The invention discloses forming equipment for ceramic guide rail production and a forming method thereof, and relates to the technical field of ceramic guide rail forming, the forming equipment comprises a conveyor, a forming processing box and a raw material box, and the top of the conveyor is provided with the forming processing box. The ultrasonic disperser arranged in the raw material box is combined with the constant-temperature heating sleeve and the viscosity sensor of the conveying pipe, uniform flowing and accurate metering injection of slurry are guaranteed, in the forming stage, the vacuum pump actively pumps out bubbles in a cavity through the micropore array, pores are further eliminated in cooperation with the high-frequency micro-vibration device, the compactness and surface smoothness of the guide rail are greatly improved, and the production efficiency is improved. The cooling runner realizes gradient cooling and curing through closed-loop control of a temperature sensor and a temperature regulator, ceramic cracking deformation is effectively inhibited, the rotary mold assembly supports multi-angle adjustment, nondestructive demolding of a complex structure is facilitated, the production period is shortened, the process stability, energy consumption control and equipment adaptation flexibility are further enhanced, and the production efficiency is improved. And the targets of high precision, low defect and batch production are achieved.

The invention relates to the field of optical protection materials, and provides a transparent film with laser eavesdropping prevention performance and a preparation method thereof.The transparent film is composed of surface-modified doped tungsten oxide nanosheets, amino-isocyanate bifunctional lithium niobate nanowires, urethane acrylate, an ultraviolet light absorber, a silane coupling agent, a dispersing agent and a flatting agent; the molybdenum-doped tungsten oxide nanosheets are obtained through silane coupling modification after hydrothermal synthesis, and the lithium niobate nanowires are prepared through a gradient modification process of hydrothermal synthesis-silane coupling-isocyanate grafting-phenol end capping. A modified nano material is uniformly dispersed in a resin matrix through an ultrasonic dispersion composite technology, and through blade coating forming, ultraviolet curing and constant-temperature and constant-humidity post-treatment, compared with the prior art, the scheme overcomes the problems that a traditional protective film is insufficient in optical transparency, laser eavesdropping prevention function and dynamic viscoelasticity, and is suitable for the field of high-end security and protection.

The invention belongs to the technical field of paint coatings, and particularly relates to a hydrophobic heat-conducting self-repairing coating and a preparation method thereof. The preparation method of the hydrophobic heat-conducting self-repairing coating comprises the following steps: ultrasonically dispersing a heat-conducting filler and polyethylene glycol in an organic solvent, dropwise adding into a water-borne epoxy resin solution, and stirring to obtain a heat-conducting coating solution; the method comprises the following steps: dropwise adding a liquid A containing polysiloxane and a fluorine-containing monomer into a liquid B containing polyethylene glycol, stirring, carrying out centrifugal suction filtration, and drying to obtain the self-repairing microcapsule. Then adding the self-repairing microcapsules and silicon dioxide into the fluorine-containing polymer solution and / or the hydrophobic resin solution, and carrying out ultrasonic dispersion to prepare a self-repairing hydrophobic coating solution; the heat-conducting coating liquid and the self-repairing hydrophobic coating liquid are uniformly sprayed or spin-coated on the surface of a metal base material in sequence and then are subjected to UV curing, and the hydrophobic heat-conducting self-repairing coating is prepared. According to the method, the process and raw materials are simple, and the prepared coating has heat conduction and self-repairing performance and is excellent in anti-aging performance.

The invention relates to the technical field of electric wires and cables, discloses a high-elasticity waterproof cable based on blending of water-blocking powder and an elastomer, and aims to solve the problems that in the prior art, during long-term dynamic service, interlayer separation is easily caused by interfacial stress superposition, so that elasticity attenuation and waterproof barrier damage are caused, and the service life is affected. According to the invention, the sodium polyacrylate water-blocking powder is subjected to composite modification and is blended with an elastomer matrix, modified nano silicon dioxide is matched for dispersion, an inner and outer layer gradient insulation structure is designed, and ultrasonic dispersion, nitrogen protection steam cross-linking and other processes are combined; the cable is sequentially provided with the conductor layer, the conductor shielding layer, the gradient insulation layer, the insulation shielding layer and the sheath layer from inside to outside, interface stress concentration is reduced, interlayer combination stability is enhanced, and the cable can still keep excellent elastic recovery capability and waterproof barrier integrity under high-frequency torsion and repeated dry-wet cycles.

The invention discloses a high-oxygen-storage zirconium solid solution material and a preparation method, and belongs to the technical field of rare earth catalytic materials, and the method comprises the following steps: precursor preparation, ultrasonic dispersion, double-gradient precipitation, ultrasonic aging, solid-liquid separation, three-section roasting and furnace cooling. Through the synergistic effect of double-gradient precipitation and ultrasonic aging, coarse grains and non-uniform particle size distribution are avoided, and the material is not prone to abnormal growth of the grains and structural collapse in long-term high-temperature service. Meanwhile, according to the gradient roasting process, through step-by-step regulation and control of crystal densification and crystal lattice reconstruction, separation of a fluorite phase and a pyrochlore phase easily occurring in traditional low-temperature single-section roasting is reduced, a stable crystal phase structure is maintained, it is ensured that the material can still keep sufficient active surface and pore channel structures under the working conditions of high temperature and thermal shock alternation, and the performance of the material is improved. The oxygen storage capacity and the long-term durability of the catalyst carrier are obviously improved.

The invention discloses a graphene heat dissipation film and a preparation method thereof, and relates to the technical field of heat dissipation materials.The method comprises the steps that graphene powder and doped particles are mixed according to the mass fraction of 5-20%, deionized water is added to serve as a dispersion medium, 0.5-5% of a stripping auxiliary agent is added, treatment is conducted through high-speed shear dispersion and ultrasonic dispersion, and the graphene heat dissipation film is obtained. Uniform and stable modified graphene slurry is formed; coating the modified graphene slurry on a base material layer by layer according to a sequence from low thermal conductivity to high thermal conductivity, controlling the coating thickness by adopting a scraper or a spin coating process, and performing pre-drying treatment after coating each layer; the coated film is dried at the temperature of 80-200 DEG C, and the interlayer bonding strength is enhanced through chemical curing or thermocuring. Through innovative design of a modified graphene material and optimization of a multi-layer gradient structure, comprehensive improvement of thermal conductivity, mechanical properties and stability of the graphene heat dissipation film is realized.

The invention relates to the technical field of nano silver powder preparation, in particular to a preparation method of high-tap-density and high-purity silver powder. The problems that in the prior art, silver powder is insufficient in purity and low in tap density are solved. The method comprises the following steps: preparing silver nitrate into a solution, carrying out electrolytic pretreatment, and carrying out chemical reduction, coprecipitation and dissolution reduction to obtain a silver powder suspension; the silver powder suspension is subjected to physical vapor deposition, silver vapor is deposited on the surface of the silver powder under the action of argon, and silver powder particles are tightly arranged; preparing an electrolyte from silver nitrate and bismuth nitrate, and carrying out electrolytic refining; and finally, the high-tap-density high-purity silver powder is obtained through ultrasonic dispersion and supercritical fluid drying treatment. By strictly controlling the process sequence and parameters and utilizing the synergistic effect among the processes, impurities are effectively removed, the particle size distribution of nano silver powder particles is optimized, the purity and tap density of the nano silver powder are improved, and the application of the silver powder in conductive materials is optimized.

A method for detecting circularity of silicon carbide micro powder relates to the technical field of silicon carbide detection, and comprises the following steps: S1, turning on a flowing particle imager, preheating and then carrying out background detection; s2, adding standard particles into the sample pool, and enabling the flowing particle imager to perform automatic focusing; s3, adding the prepared silicon carbide micro powder sample into a sample pool, and detecting by using a flowing particle imager; and S4, storing the detection result, checking the silicon carbide micro powder particle image, and recording the detection result. The preparation of the silicon carbide micro-powder sample comprises the following steps: S31, adding the dried silicon carbide sample into a dry and clean beaker; s32, sequentially adding an impregnating compound, a dispersing agent and deionized water into the beaker; s33, carrying out ultrasonic dispersion; and S34, taking out the uniformly mixed sample. The method can solve the technical problem of detection failure caused by easy agglomeration of the silicon carbide sample when the flowing particle imager is used for detecting the circularity of the silicon carbide micro powder.

The invention relates to the technical field of engineering plastics, and discloses a polydicyclopentadiene / carbon nanofiber composite material and a preparation method and application thereof.The method comprises the steps that DCPD, ENB and MNA are mixed to be uniform, CNF is added and subjected to ultrasonic dispersion, a Grubbs second-generation catalyst is added and subjected to ultrasonic dispersion after freezing, finally, mixed liquid is poured into a mold, and the polydicyclopentadiene / carbon nanofiber composite material is obtained. And heating and curing to obtain the high-performance PDCPD / CNF composite material. According to the preparation method, the interaction between PDCPD and CNF can be remarkably improved, so that the mechanical property of the composite material is improved, the used raw material DCPD has low viscosity and high reaction activity, and rapid forming can be realized; meanwhile, the whole production process of the modified PDCPD composite material is green and environment-friendly, the process is simple, complicated chemical modification is not involved, and the feasibility of large-scale industrial production is achieved.

The invention discloses a laser particle size detection system and a feeding device, and relates to the technical field of laser particle size analyzers. The system comprises a laser, a lens unit, a sample chamber, a photoelectric detection unit, an imaging unit, a sample introduction unit, a temperature control unit and an information interaction and processing unit. The feeding device comprises a shell, a motor, an annular water sprayer and the like. A sample is preliminarily dispersed by the feeding device, is further dispersed by the ultrasonic disperser and then enters the sample chamber. After the system is started, laser emitted by the laser device is processed and enters the sample chamber, generated diffraction light is received by the photoelectric detection unit, meanwhile, the thermotank and the thermodetector guarantee stable temperature, the water level induction meter monitors the water level, and the information interaction and processing unit processes data and transmits a result to the imaging unit to be displayed. Compared with the prior art, the method has the advantages that the detection precision, the operation convenience and the detection efficiency are improved, the stability and the repeatability are good, the particle size characteristics of the sample can be more accurately reflected, the detection time is shortened, and the operation difficulty is reduced.

The invention relates to the technical field of synthesis and preparation of nano materials, in particular to a method for preparing tin dioxide powder, which comprises the following steps: S1, preparing a 0.1-5 mol / L tin salt solution, adding a compound additive into the tin salt solution, and carrying out ball milling treatment after ultrasonic dispersion to obtain a pretreated tin salt solution; s2, freezing and freezing the pretreated tin salt solution in an ultralow-temperature environment to obtain a frozen sample; s3, transferring the frozen sample into a vacuum freeze dryer for dehydration treatment to obtain solid powder; and S4, carrying out high-temperature calcination on the solid powder to obtain tin dioxide powder. Zero sewage discharge is achieved in the preparation process, the problem of sewage discharge and treatment of traditional liquid-phase powder preparation is solved, meanwhile, the phenomenon of sintering agglomeration accompanied by traditional solid-phase calcination can be avoided, high-quality superfine tin dioxide powder preparation is achieved, the method is simple and safe in process, and industrial large-scale production and preparation are easy to achieve.

The invention relates to preparation and photocatalytic application of a three-component covalent organic framework photocatalyst. The invention aims to solve the problems of low visible light utilization rate, low efficiency of photocatalytic synthesis of hydrogen peroxide and complex synthesis process of a multi-component covalent organic framework material in the synthesis of a high-performance photocatalyst in the prior art. The method comprises the following steps: dispersing two reaction monomers into an organic solvent to form a mixed solution, adding a catalyst into the mixed solution, then adding the third monomer, carrying out ultrasonic dispersion, carrying out a heating reaction for a period of time, cooling to room temperature, and carrying out solid-liquid separation to obtain a solid; and carrying out solid separation, collecting the solid, washing and drying to obtain the three-component covalent organic framework material. The prepared TTBTP-1 three-component covalent organic framework photocatalytic material is high in crystallinity and good in catalytic effect and is superior to a two-component photocatalyst, the preparation method is simple, through the design thought that p-phenylenediamine is adopted as a linker to connect two monomers with different structures, the thought is broadened for the design of a novel COF structure and function, and the application prospect is broad. The method has important research significance.

The invention provides a preparation method and application of a carbon nanotube sponge / liquid metal composite material. The preparation method of the carbon nanotube sponge / liquid metal composite material comprises the following steps: 1) preparing a porous carbon nanotube sponge by adopting a chemical vapor deposition method, and removing surface impurities through plasma cleaning to form a hydrophilic oxygen-containing group; 2) placing the liquid metal gallium-indium eutectic in an ethanol solution, and carrying out ultrasonic dispersion to prepare a uniform liquid metal dispersion liquid; 3) immersing the pretreated carbon nanotube sponge into the liquid metal dispersion liquid, and placing in vacuum to realize vacuum-assisted impregnation; and 4) drying the soaked carbon nanotube sponge in a drying oven at 40 DEG C, and compacting the composite material through rolling operation. According to the application of the carbon nanotube sponge / liquid metal composite material in the field of electromagnetic shielding, the conductivity and the electromagnetic shielding effectiveness of the material are remarkably improved, and the carbon nanotube sponge / liquid metal composite material has a wide application prospect.

The invention discloses a preparation method of a high-heat-efficiency polyurethane heating film based on generative adversarial network optimization. The preparation method comprises the following steps: S1, screening and characterizing a polyurethane base material, a conductive filler and an interface enhancer; s2, generating an initial data set based on a cross-domain mapping rule; s3, constructing a cross-domain attribute migration generative adversarial network, and outputting an optimized formula parameter set; s4, generating an optimal material formula in combination with a dynamic attribute weight adjustment mechanism; s5, preparing a homogeneous mixture through ultrasonic dispersion and shear stirring technologies; s6, optimizing a channel structure by utilizing a collaborative functional material nano-channel reconstruction module and combining a dynamic interface self-assembly technology to generate a to-be-formed film; s7, the film to be formed is tested, and the material formula and the channel structure are optimized; and S8, forming of the thin film is completed through a coating and film forming process, and finally the optimized polyurethane heating film is prepared. By means of the generative adversarial network optimization technology, efficient preparation of the polyurethane heating film is achieved.

The invention discloses a method for preparing a flexible self-supporting MXene / graphene / carbon nanotube thin film electrode material, which comprises the following steps: ultrasonically dispersing exfoliated graphene in deionized water, centrifuging to form a graphene dispersion; adding functionalized carbon nanotubes to a polydiallyldimethylammonium chloride solution, ultrasonically dispersing, centrifuging and washing to obtain carbon nanotubes modified with polydiallyldimethylammonium chloride; mixing the MXene dispersion and the graphene dispersion, adding carbon nanotubes modified with polydiallyldimethylammonium chloride, ultrasonically crushing, stirring, vacuum filtering to form a film, freeze drying, and annealing. The introduction of graphene and carbon nanotubes suppresses the problem of easy stacking of MXene, increases active sites, promotes the diffusion of electrolyte ions, and improves electrochemical performance.

The invention relates to the technical field of flexible stimulation response self-drivers, in particular to a preparation method of an electricity-temperature dual stimulation deformation reversible composite material driver, which comprises the following steps: firstly, carrying out chemical modification and solution ultrasonic dispersion on conductor particles to improve interface cohesiveness and improve interface bonding between a conductor and a polymer; melting, blending and compounding polyethylene vinyl acetate free radical double-group coupling by using a double-screw mixer to prepare a shape memory hemicrystalline and carbon-carbon single bond net-shaped cross-linked molecular network structure; uniformly doping and embedding conductor unit particles into a molecular network to construct a conductive three-dimensional network, and forming a conductive blend with a bicontinuous phase structure; and finally, thermally pressing the conductive blend to initiate a macromolecular free radical cross-linking reaction to prepare the electric-temperature dual-stimulation deformation reversible composite material driver with a conductive-semi-crystalline-cross-linked three-dimensional network structure. According to the invention, electric and thermal dual stimulation reversible deformation response of the shape memory composite material can be realized.

The invention discloses a method for stripping an attenuation layer of a waste lithium ion positive electrode material and recycling of the attenuation layer, and belongs to the technical field of lithium ion batteries, and the specific method comprises the following steps: pretreating the waste lithium ion positive electrode material, dispersing the pretreated waste lithium ion positive electrode material into a solvent, and performing ultrasonic dispersion vibration to obtain the attenuation layer of the waste lithium ion positive electrode material; and then putting the material subjected to ultrasonic dispersion vibration into a ball milling tank, adding a ball milling medium, carrying out ball milling, taking out the material subjected to ball milling, carrying out ultrasonic dispersion vibration again, and then filtering, drying and screening to obtain the recycled positive electrode material. The method is simple in process, the adaptability of the waste positive electrode material is high, and the utilization efficiency of the waste positive electrode material is finally improved.

The invention discloses a multi-dimensional interface memristor, and belongs to the field of semiconductor devices, a metal oxide / graphene two-dimensional film material is used as a switch layer of the memristor, and the preparation method comprises the following steps: carrying out hydrophilization treatment on a graphene dispersion liquid, and then carrying out first ultrasonic dispersion; adding a metal oxide quantum dot dispersion liquid, and carrying out secondary ultrasonic dispersion, so that the metal oxide quantum dots are loaded on the surface of the graphene to obtain a successfully loaded solution; and plating the successfully loaded solution on the surface of a substrate by adopting a wet coating process, and drying to form a film, thereby obtaining the metal oxide / graphene two-dimensional film switch layer. Wherein the metal oxide is SnO2, TiO2, NiO2, CeO2 or IGZO (Indium Gallium Zinc Oxide). According to the invention, the oxide quantum dots are attached to the single-layer graphene film to form the zero-dimensional quantum dot / two-dimensional graphene composite film as the switch layer of the memristor, and the method can introduce a large number of oxide / graphene interfaces, so that the regulation and control effect of the interfaces on the photoelectric characteristics of the device can be amplified.

The invention relates to the technical field of floor slab concrete, and discloses aerated concrete applied to sound insulation and heat preservation of a floor slab and a preparation method of the aerated concrete aiming at the problems that an existing sound insulation floor slab containing the aerated concrete is poor in structural stability, namely the sound insulation effect and the long-term effect of mechanical properties are poor and the like. Comprising 30-40 parts of fly ash, 25-35 parts of sand, 15-20 parts of ardealite, 10-15 parts of quick lime, 5-8 parts of silicon-aluminum porous microspheres, 3-5 parts of slaked lime, 1-2 parts of Fe3O4-polypropylene fiber and 0.2-0.5 part of aluminum powder. The preparation method of the silicon-aluminum porous microspheres comprises the following steps: mixing a silicon source, an aluminum source and a surfactant, and uniformly stirring to obtain silicon-aluminum homogenate; and adding nano titanium dioxide, carrying out ultrasonic dispersion and freeze drying, transferring into a heating furnace, and heating and calcining to obtain the silicon-aluminum porous microspheres. The supporting and strengthening effects on pores are realized through gas production reaction and the like in the material, so that the structural strength and durability of the aerated concrete are improved.

The invention discloses an intelligent modified atmosphere packaging film with gas selectivity and pH / humidity double response as well as a preparation method and application of the intelligent modified atmosphere packaging film. The preparation method comprises the following steps: mixing thymol emulsion and graphene oxide dispersion liquid, and stirring and reacting at room temperature in a dark place to prepare graphene oxide-thymol; the preparation method comprises the following steps: dissolving chitosan in an acetic acid aqueous solution, then adding graphene oxide-thymol and a plasticizer, and carrying out ultrasonic dispersion treatment to form a film-forming solution; and carrying out film forming treatment on the film forming solution by adopting a casting method to prepare the intelligent modified atmosphere packaging film with gas selectivity and pH / humidity double response. The prepared intelligent modified atmosphere packaging film can be modified automatically, is uniform and stable in structure, high in encapsulation efficiency, close in coordination, good in antibacterial and antioxidant activity and excellent in mechanical property and gas barrier property, can realize selective adsorption of gas, controls release of thymol by responding to changes of the pH value and humidity in the environment, and has a good application prospect. The method has a good application prospect in the field of fruit and vegetable preservation.

The invention discloses a nano graphene oxide hybridized polyacrylamide high-temperature-resistant fracturing fluid and a preparation method thereof.The preparation method comprises the steps that nano graphene oxide is added into water according to the proportion, in order to avoid the agglomeration phenomenon, the nano graphene oxide is placed in an ultrasonic dispersion machine to be dispersed for 15 min under the condition that the ultrasonic power is 19.86 Hz, and it is guaranteed that the nano graphene oxide is evenly dispersed in an aqueous solution; and sequentially adding the clay stabilizer, the gel breaker, the cleanup additive, the polyacrylamide, the pH regulator and the cross-linking agent according to the formula to prepare the cross-linked gel fracturing fluid.

The invention provides a preparation method of a concrete pavement curing agent, and belongs to the technical field of concrete. The preparation method comprises the following steps: preparing a modified beta-cyclodextrin solution, preparing a polyurethane emulsion 1, preparing a polyurethane emulsion 2, and mixing. The mixing method comprises the following steps: adding potash water glass into deionized water, sequentially adding a water-based stabilizer, a polyurethane emulsion 1, a polyurethane emulsion 2 and decyl glucoside in a stirring state, and then transferring the mixture into an ultrasonic oscillator for ultrasonic dispersion for 25-35 minutes to obtain the concrete pavement curing agent. The effective water retention rate of the curing agent is 92-96%, the compressive strength ratio is 95-97% in 7d and 98-99% in 28d, the abrasion loss is 0.7-1.1 kg / m < 2 >, the solid content is 27-30%, and the drying time is 1.1-1.4 h.

The present invention belongs to the technical field of coating protection, and discloses a wear-resistant micro-nano structure super-hydrophobic coating with photothermal effect and a preparation method thereof. The method comprises the following steps: spin coating a defoamed PDMS prepolymer and a curing agent mixture onto a substrate for pre-curing treatment; adding micron carbon black particles or nano carbon black particles with photothermal effect into an organic solvent for ultrasonic dispersion to obtain a dispersion; spraying a micron carbon black dispersion on the surface of a substrate coated with PDMS, and then spraying a nano carbon black dispersion to obtain a coating with a micro-nano structure and a photothermal effect; then spraying a layer of PDMS prepolymer and a curing agent mixture diluted with an organic solvent on the surface, and curing at low temperature to enhance the wear resistance and mechanical stability of the coating. The coating prepared by the present invention has good super-hydrophobicity and wear resistance and durability; the photothermal effect significantly increases the temperature of the substrate under the action of sunlight, and has good application prospects in anti-icing.

The invention discloses a high-strength photovoltaic welding flux for a photovoltaic welding strip and a preparation method of the high-strength photovoltaic welding flux, and belongs to the technical field of energy conservation and environmental protection. According to the solder, the Sn-Zn-Bi alloy is used as a matrix, and the performance is comprehensively improved by introducing a dual nano reinforced phase of the multi-walled carbon nanotubes and the nano nickel particles. The preparation method comprises the steps of matrix alloy melting, a hydrothermal method, a liquid phase reduction method, ultrasonic dispersion, gas atomization powder preparation, silane coupling agent surface modification, scaling powder compounding, reflow soldering and the like. The obtained solder has excellent comprehensive performance, excellent thermal fatigue resistance and long-term reliability. The welding flux is suitable for interconnection welding of a main grid, a fine grid and a welding strip of a crystalline silicon photovoltaic cell, and provides technical guarantee for the service life of a photovoltaic module more than 25 years.

The invention relates to a 3D printing preparation method of a high-absorption electromagnetic shielding composite material with a gradient structure. The 3D printing preparation method comprises the following steps: adding Fe3O4 and CNT into a dimethyl sulfoxide solution, fully shaking up, carrying out ultrasonic dispersion treatment, continuously adding TPU particles, continuously mechanically stirring at room temperature, and adding different CNT contents as required to prepare various Fe3O4 / CNT / PU composite ink; sequentially inputting various Fe3O4 / CNT / PU composite inks into a 3D printer, performing extrusion printing in a coagulating bath to obtain a composite frame, soaking and washing the composite frame with deionized water, and performing constant-temperature drying to obtain a composite frame with a porous structure; the composite frame and the high-conductivity flexible MXene film are bonded and cured through a polyurethane solution, and the composite material is obtained. Therefore, the problem of serious secondary electromagnetic radiation pollution caused by the electromagnetic wave (EMW) reflection characteristic of the existing conductive electromagnetic interference shielding composite material is solved.

The invention belongs to the technical field of seawater detection, and particularly relates to a detection method for simultaneously detecting seawater-based Pb (II) and Cd (II), which comprises the following steps: step 1, polishing a glassy carbon electrode: polishing the glassy carbon electrode for three times by using aluminum oxide powder according to an 8-shaped track, then carrying out ultrasonic treatment in ultrapure water for 2-4 minutes, removing surface adhesion substances, washing by using ultrapure water, and drying to obtain the glassy carbon electrode; and activating the glassy carbon electrode in a sulfuric acid solution, scanning by using cyclic voltammetry until a stable cyclic voltammetry curve is obtained, washing by using ultrapure water, and drying at room temperature. Step 2, preparing a graphitized carboxylated multi-walled carbon nanotube solution, namely weighing 3.5 mg of graphitized carboxylated multi-walled carbon nanotubes and 0.8 mg of nano zinc oxide, dissolving the graphitized carboxylated multi-walled carbon nanotubes and the nano zinc oxide in 5ml of dimethylformamide, and performing ultrasonic dispersion for more than 3h to obtain the graphitized carboxylated multi-walled carbon nanotube solution; the method has good stability, reproducibility and anti-interference performance, and can realize high-sensitivity detection of Pb (II) and Cd (II) in actual seawater.

The invention relates to the technical field of photovoltaics, and discloses photovoltaic conductive silver-coated copper micro powder and a preparation method thereof, and the preparation method aims to solve the problem that performance and cost of existing silver-coated copper micro powder in photovoltaic application are difficult to consider at the same time. Through pH adjustment, organic pre-bonding treatment and gradient ammonification, the activity of the copper powder is reserved, and a uniform copper-ammonia complexing layer is constructed; in the chemical silver plating stage, the pretreatment liquid is added into a composite base solution containing a complexing agent, organic amine, a dispersing agent and a combined reducing agent, and a silver-ammonia solution is dropwise added for reaction under ultrasonic dispersion and nitrogen introduction protection; and in the post-treatment stage, a finished product is obtained through ethanol reflux desorption, antioxidant treatment, vacuum drying, low-temperature plasma activation and screening, uniform and complete coating of a silver layer can be achieved under the low silver content, and a feasible path is provided for replacing photovoltaic pure silver powder with silver-coated copper micro powder on a large scale.

The invention discloses a photonic crystal hydrogel-based thermochromic intelligent window material as well as a preparation method and application thereof. The photonic crystal hydrogel-based thermochromic intelligent window material is obtained by filling a three-dimensional photonic crystal structure with a temperature-sensitive hydrogel prepolymerization solution and then curing the three-dimensional photonic crystal structure; the preparation method comprises the following steps: adding a temperature-sensitive monomer, modified cellulose and a cross-linking agent into deionized water, carrying out ultrasonic dispersion, stirring under an ice bath condition until the materials are completely dissolved, adding an initiator, stirring until the materials are dissolved, adding N, N, N ', N'-tetramethylethylenediamine, and uniformly stirring to obtain the temperature-sensitive hydrogel prepolymer. The photonic crystal hydrogel-based thermochromic intelligent window material prepared by the invention can regulate and control the window transmittance in real time according to the environment temperature, and has a sensitive thermochromic effect and excellent infrared shielding performance.

The invention discloses a hard carbon sodium battery negative electrode material taking peanut shells as a raw material, which is micron-sized particles of mixed nano-particles containing C, O, Na and N. After the material is subjected to ultrasonic dispersion, holes are wrapped by graphitization-like areas with the size range of 0.6-3 nm to form disordered accumulation, and the average graphite layer spacing is 3.6-4.0. The preparation method comprises the following steps: heating and pre-oxidizing the peanut shells in an air atmosphere, grinding or crushing the peanut shells into powder, adding a disodium ethylene diamine tetraacetate solution, uniformly stirring, and drying; and calcining and carbonizing the dried mixture in a nitrogen atmosphere, and cooling to obtain the hard carbon sodium battery negative electrode material taking the peanut shells as the raw material. When the obtained hard carbon material serves as a sodium ion battery negative electrode and is charged and discharged at 0.1 C, the initial charging specific capacity can reach 274-318 mAh.g <-1 >, the first-circle coulombic efficiency reaches 74%-84%, and the problems that a hard carbon sodium battery negative electrode material is low in capacity and low in initial coulombic efficiency are solved.