15results about How to "Composite uniform" patented technology

The invention discloses a graphene composite perovskite manganese oxide polycrystalline ceramic and a preparation method and application thereof, and belongs to the technical field of non-refrigeration high-sensitivity infrared detection. The chemical expression of the graphene composite perovskite manganese oxide polycrystalline ceramic is La < 0.81 > (Ca < 0.03 > Sr < 0.16 >) MnO3: Gy, G is graphene, y is the mass fraction of graphene in perovskite manganese oxide composite powder, and y is equal to 0.1-0.2%. The TCR value of the prepared polycrystalline ceramic can reach 30% or above, the Tk value is close to 300K, the polycrystalline ceramic has excellent adaptability to room temperature work and excellent sensitivity to temperature change, and when the polycrystalline ceramic is applied to an uncooled infrared detector, the detection precision of the uncooled infrared detector can be effectively improved.

The application belongs to the field of new materials, and discloses a lead-free perovskite X-ray shielding composite material and a preparation method and application thereof, and comprises the following steps: mixing ANF / DMSO dispersion liquid with ethanol to obtain re-protonated ANF dispersion liquid; mixing the re-protonated ANF dispersion liquid, CsI powder and ethanol, and stirring to obtain two portions of the same CsI / ANF dispersion liquid; mixing re-protonated ANF, Cs3Bi2I9 powder and ethanol, and stirring to obtain Cs3Bi2I9 / ANF dispersion liquid; sequentially filtering the first portion of CsI / ANF dispersion liquid, the Cs3Bi2I9 / ANF dispersion liquid and the second portion of CsI / ANF dispersion liquid by using a gel-gel method, and vacuum hot-pressing to obtain a composite gradient film with a biomimetic symmetrical structure, which is used as a lead-free perovskite X-ray shielding composite material; and the application realizes continuous and efficient X-ray shielding effect, and can improve the mechanical flexibility and thermal stability of the material.

The invention discloses a Co3O4-Cu2-xS composite photo-thermal catalyst as well as a preparation method and application thereof. The composite photo-thermal catalyst is prepared by taking a surfactant as a bridge and compounding Co3O4 and Cu2-xS. The composite photo-thermal catalyst has a reduced band gap width, can effectively promote migration and separation of photon-generated carriers, enhances the absorption efficiency of visible light-near infrared light, and shows excellent photo-thermal conversion performance. The composite photo-thermal catalyst can be used for constructing a Co3O4-Cu2-xS + PMS + NIR catalytic system, and peroxymonosulfate is activated under the irradiation of near-infrared light so as to degrade antibiotics in water. Experiments prove that the Co3O4-Cu2-xS + PMS + NIR system disclosed by the invention can achieve the degradation rate of 99% on levofloxacin within 20 minutes, and the generation efficiency of active species is remarkably improved through the synergistic effect of a photothermal effect and interface activation. The catalyst has broad-spectrum degradation activity on various antibiotics, keeps efficient and stable catalytic performance in a wide pH range, and shows excellent ion interference resistance and adaptability to various water bodies.

The present application relates to the technical field of sanitary products, and particularly relates to a biodegradable nursing pad and a preparation process thereof. The nursing pad comprises a skin-friendly top layer, a composite core absorption layer and a gas-impermeable bottom layer from top to bottom. The composite core absorption layer comprises a gel-embedded skeleton composed of an air-laid wood pulp fiber web and a composite antibacterial hydrogel in-situ cross-linked and embedded in the pores of the web, and a fluff pulp fiber layer fixed to at least one surface of the skeleton. The composite antibacterial hydrogel comprises hydrophilic reinforcing fibers modified by a silane coupling agent with a hydrophilic group, a sodium alginate matrix and zinc ions. The nursing pad prepared by the present application has excellent rapid absorption, high antibacterial efficiency and high biodegradability, and solves the problem that traditional products are difficult to have both performance and environmental protection.

The invention discloses a preparation method of SiC, which comprises the following steps: dispersing biomass in water, adding a modifier with oxidizability for modification to obtain acidic functional group modified biochar, uniformly dispersing the modified biochar, water glass and metal salt in water, transferring into a hydrothermal kettle, and carrying out hydrothermal reaction to obtain the SiC. The preparation method comprises the following steps: preparing a carbon-silicon precursor, filtering and drying the carbon-silicon precursor, carrying out a carbon thermal reduction reaction in an argon atmosphere to obtain a SiC crude product, carrying out high-temperature calcination on the obtained SiC crude product to remove unreacted carbon, soaking the obtained SiC crude product in an acid or alkali to remove unreacted impurities, washing, filtering, and drying to obtain a SiC finished product. According to the method, equipment is simple, irritant gas cannot be generated, and the SiC production method which is low in cost and green is provided.

The invention discloses an LED chip and a preparation method thereof. The LED chip comprises a substrate and an epitaxial structure arranged on the surface of one side of the substrate. The epitaxial structure comprises a first type semiconductor layer, a multi-quantum well layer and a second type semiconductor layer which are sequentially arranged along a first direction, and the first direction is perpendicular to the substrate and points to the epitaxial structure from the substrate; the multi-quantum well layer comprises a periodic structure formed by first film groups, and each first film group comprises a quantum barrier layer and a quantum well layer which are sequentially arranged along a first direction; the quantum barrier layer is a GaN layer, and the quantum well layer is of a periodic structure composed of a first sub-layer and a second sub-layer; the first sub-layer is an I nGaN layer with the I n content being n, the second sub-layer is an I nGaN layer with the I n content being m, and m is larger than n, so that the energy band of the quantum well layer is in a zigzag shape. The zigzag energy band can regulate and control the spatial distribution of the I < n > cluster in the quantum well layer, reduce the barrier height and increase hole injection, thereby increasing the probability of overlapping of electrons and hole wave functions, and further improving the luminous efficiency of the LED chip.

The invention belongs to the technical field of photocatalytic composite materials and preparation thereof, and particularly relates to a Cu2O / MoS2 / MgO / g-C3N4 nano composite material as well as a preparation method and application thereof. The preparation method of the Cu2O / MoS2 / MgO / g-C3N4 nano composite material disclosed by the invention comprises the following steps: preparing g-C3N4, preparing a MoS2 / g-C3N4 composite material, preparing a MgO / MoS2 / g-C3N4 nano composite material, and pretreating a copper net. And carrying out two times of electro-deposition to obtain the Cu2O / MoS2 / MgO / g-C3N4 nano composite material growing on the copper mesh. The preparation method of the Cu2O / MoS2 / MgO / g-C3N4 nano composite material provided by the invention is convenient to operate, the prepared nano composite material is good in hydrophilicity, and the prepared nano composite material is high in degradation efficiency when applied to wastewater degradation.

The application provides a semiconductor device, relates to the technical field of semiconductor, and aims to solve the problem of increased on-resistance caused by bipolar degradation of a semiconductor device in the prior art.The semiconductor device comprises a polycrystalline silicon carbide substrate with P-type conductivity, a drift layer with N-type conductivity, and a collector metal layer, the drift layer is arranged above the polycrystalline silicon carbide substrate, and the drift layer is internally provided with a P column and an N region which are adjacent in the lateral direction; the collector metal layer is directly laminated on the other side of the polycrystalline silicon carbide substrate which is away from the drift layer and forms an ohmic contact with the polycrystalline silicon carbide substrate. The polycrystalline silicon carbide substrate can inject a higher concentration of minority carriers into the drift layer, so as to improve the conductance modulation efficiency and reduce the resistance; meanwhile, the polycrystalline silicon carbide substrate makes the recombination process of electrons and holes in the drift layer more uniform, and energy is not released at a certain point, thereby reducing the serious bipolar degradation phenomenon caused by local defect aggregation.

The application discloses a mesoporous hollow sphere assembly structure catalyst and a preparation method and application thereof, and belongs to the technical field of hydrogen production by methane decomposition. The preparation method comprises the following steps: dissolving Ni salt, Al salt and Ce salt in a solvent, and controlling the molar ratio of Ni, Al and Ce to be 7:(1-2.5):(0.5-2); obtaining atomized liquid drops through atomization, and performing a decomposition reaction on the atomized liquid drops at 400-500 DEG C; collecting reaction products, drying, and then calcining by heating to 550-700 DEG C to obtain a catalyst precursor; and performing reduction treatment on the catalyst precursor in a reducing atmosphere, and the mesoporous hollow sphere assembly catalyst with a cerium-doped regulated interface is obtained. The catalyst exhibits remarkable high mass space velocity long-term stability and anti-coking performance in the methane catalytic decomposition reaction.

The application discloses a special slow-release and controlled-release fertilizer for forests and grasses in desert and arid areas, and belongs to the technical field of agricultural fertilizers. The fertilizer solves the problems of too fast nutrient release, insufficient water retention and easy failure of trace elements of traditional slow-release fertilizers in a desert environment. The technical scheme points of the fertilizer are as follows: a three-layer coating structure is adopted, the core layer comprises mixed particles of ammonium biphosphate, potassium nitrate, magnesium sulfate, a trace element compound, amino acid chelated calcium and humic acid; the slow-release layer is a mixed coating of polylactic acid and ethyl cellulose, and the slow-release layer is inlaid with chitosan microspheres containing bacillus subtilis spores; the water-retaining layer comprises a porous adsorption layer formed by cross-linked sodium polyacrylate and diatomite; and the outermost layer is a carbonized rice husk protective layer. The fertilizer realizes slow nutrient release and long-term water retention through the synergistic effect of the core layer for providing nutrients, the slow-release layer for controlling the release rate, the water-retaining layer for adsorbing water and the carbonized rice husk layer for resisting wind erosion, so that the survival rate of forests and grasses is increased to more than 95%, the number of annual fertilization is reduced by 60%, and the fertilizer is especially suitable for cultivation of drought-tolerant plants such as coniferous trees in desert and arid areas.

The invention discloses automatic surface laminating equipment for rolled metal strips, and particularly relates to the technical field of metal strip laminating, the automatic surface laminating equipment comprises a machining table, two supporting frames are arranged at one end of the top of the machining table, a feeding roller is arranged between the two supporting frames, and a feeding motor is arranged at one end of the feeding roller; and film laminating rollers are rotationally arranged between the two supporting frames and located at the top and the bottom of the feeding roller, a dust sticking structure is arranged at the position, located on one side of the two adjacent supporting frames, of the top of the machining table, a hot-pressing cutting structure is arranged on one side of the dust sticking structure, and a straightening measuring structure is arranged on one side of the hot-pressing cutting structure. According to the automatic film laminating machine, multiple steps of dust sticking, straightening, film laminating, measuring and cutting of the strip can be achieved when the strip is subjected to film laminating, the automation degree is high, the machining efficiency and quality of the metal strip are improved, and reliable guarantee is provided for subsequent machining operation.

This invention belongs to the field of functional material preparation, and particularly relates to a flake-like MoO2. 2 / Mo 2 C@poplar catkin biomass carbon composite material and its application: scaly MoO2 was prepared by a method of poplar catkin carbonization-impregnation with molybdate-calcination in an inert atmosphere. 2 / Mo 2 C@poplar catkin biomass carbon composite material, and further calcined the material in air to prepare hollow tubular MoO 3 The materials and synthesis methods are simple and easy to implement. The materials obtained in this invention exhibit excellent performance as anode materials for lithium-ion batteries and cathode carrier materials for lithium-sulfur batteries, which is beneficial for the preparation of high-energy-density electrode materials. Moreover, the preparation method is inexpensive and can simultaneously solve the harm caused by poplar catkins, realizing the high-value utilization of poplar catkins.

The invention provides a multifunctional film for intelligent wearing and a preparation method thereof, and relates to the technical field of intelligent wearing materials. According to the multifunctional thin film for intelligent wearing and the preparation method of the multifunctional thin film, the thin film is formed by alternately overlapping the graphene carbon nanotube layers and the nano-silver layers, the thin film has toughness after hot pressing treatment, and the sheet resistance is smaller than or equal to 25 ohms; the graphene carbon nanotube layer is formed by electrostatic spinning of a graphene carbon nanotube composite dispersion liquid, and the nano-silver layer is formed by electrostatic spinning of a spinning solution containing silver nitrate; the graphene carbon nanotube composite dispersion liquid is prepared from the following raw materials: an NMP (N-Methyl Pyrrolidone) solution of polyvinylpyrrolidone (K30), single-layer graphene powder and few-walled carbon nanotube powder; the silver nitrate-containing spinning solution is prepared from the following raw materials: an NMP (N-Methyl Pyrrolidone) solution of polyvinylpyrrolidone (K30) and a silver nitrate solid. And by adopting the electrostatic spinning and hot pressing processes, the film has the functions of sterilization, infrared physiotherapy and heating, is washable and rubbed, is low in cost and is suitable for large-scale production.

The invention discloses porous silicon composite metal as well as a preparation method and application thereof, a low-cost silicon source is uniformly mixed with a metal material in a liquid phase environment, uniform compounding is realized by adjusting the pH value and a coprecipitation method, and then the metal is skillfully compounded into porous silicon by a thermal reduction method, so that the porous silicon composite metal is obtained. The novel negative electrode material with metal embedded in the porous silicon-based framework is formed, the material has excellent mechanical stability, the volume expansion of silicon is slowed down to a certain extent, and meanwhile, the electron / ion conductivity of a silicon-based negative electrode is greatly enhanced, so that the reversible capacity, the rate and the long-term cycle performance of the material are remarkably improved. The method is simple in process, low in cost, low in requirements on instruments and equipment, non-toxic, harmless and suitable for large-scale production, and has a wide application prospect and an important application value.

The invention discloses a high-energy maintenance-free lead-acid battery for electric vehicles. By reducing the height of the positive and negative electrodes, keeping the width unchanged, reducing the amount of positive and negative active substances, and adopting an edge negative plate group, the overall weight of the battery is reduced to 5.5 kilograms, while maintaining the same appearance size, keeping the pole lead-out structure unchanged, the position of the acid adding port unchanged, and slightly increasing the diameter of the acid adding port, quantitative acid addition is achieved while the electrolyte fully reacts with the electrode, and the final result is that the battery opening voltage range is narrowed and the battery assembly rate is improved; by changing the uneven current distribution on the pole plate, the pole plate length-width ratio is reasonably set, and the utilization rate of the upper part and the lower part of the pole plate is increased; by changing the state of overcharge and overdischarge on the upper part of the pole plate and shallow charge and shallow discharge on the lower part of the pole plate, the maximum uniformity of the electrochemical reaction of the pole plate is achieved, and then the consistency and stability of the battery in the actual application process will be improved, and the various performances of the battery are stably improved while the service life of the battery is extended.