47results about How to "Increase scattering" patented technology

The invention discloses nanoscale high-entropy A2B2O7 type oxide ceramic powder and a preparation method of a nano ceramic block of the nanoscale high-entropy A2B2O7 type oxide ceramic powder, and the preparation method comprises the following steps: S1, uniformly dispersing a rare earth element source and a transition metal source in deionized water, stirring at room temperature, and then adding a polymerizing agent and an inducer to obtain a mixed solution; s2, continuously stirring at room temperature to form a transparent clear solution; s3, heating the transparent clarified solution until milk white gel is gradually formed; and S4, drying the milk white gel into dry gel. According to the nanoscale high-entropy A2B2O7 type oxide ceramic powder and the preparation method of the nano ceramic block of the nanoscale high-entropy A2B2O7 type oxide ceramic powder, discharge plasma sintering is combined with a two-step preparation process, the efficiency is high, sintering is compact, the grain size of a ceramic block material can be controlled, and the nano ceramic block can be used for preparing the nano-scale high-entropy A2B2O7 type oxide ceramic powder. And the synthesized oxide has the characteristics of fine powder particle size, uniform distribution, few impurities and the like, and the method is low in synthesis temperature and relatively low in cost.

The invention provides a substrate integrated waveguide slot array antenna based on a waveguide grating filtering structure. A radiation slot array antenna is formed by arranging a radiation slot array on a first metal layer on the surface of a substrate integrated waveguide; secondly, a grating filtering structure is formed by periodically arranging metalized blind hole groups at the bottom of the substrate integrated waveguide. According to the substrate integrated waveguide slot array antenna based on the waveguide grating filtering structure, selection and propagation of a specific working frequency band are realized by controlling the aperture of the metalized blind holes, the hole pitch of the metalized blind hole group, the line pitch, the waveguide shape and the opening mode of the radiation slot array in the substrate integrated waveguide slot array antenna based on the waveguide grating filtering structure; and the manufacturing process of the substrate integrated waveguide slot array antenna based on the waveguide grating filtering structure is simplified while effective integration of the substrate integrated waveguide slot array antenna and the grating filtering structure is realized.

The preparation method comprises the following steps: dissolving PVDF (Polyvinylidene Fluoride) in acetone, adding a small amount of Tween 80, carrying out oil bath at 60 DEG C, and uniformly mixing until the solution is transparent, so as to prepare a polymer solvent system; and standing and defoaming the obtained solution, pouring into a mold, and naturally volatilizing by controlling the humidity to obtain the polymer porous membrane with the porous microsphere net structure. According to the method, phase separation is induced through solvent evaporation, and synchronous construction of micron holes and nanospheres of the PVDF porous membrane is achieved. Compared with a traditional phase separation membrane preparation technology, the method has the advantages that the pore size of the PVDF porous membrane can be greatly expanded, controllable preparation of micron / nano pores of the PVDF porous membrane is realized, and the prepared porous membrane has more excellent reflectivity and cooling performance.

The invention relates to the field of ceramic substrates, provides a preparation method of a high-toughness aluminum nitride substrate, and solves the problem that an aluminum nitride substrate prepared in the prior art cannot have both high toughness and high density. Comprising the following steps: 1) preparing raw materials, namely preparing the following raw materials in parts by weight: 100-110 parts of AlN powder, 6-12 parts of AlN whiskers, 0.1-1 part of modified boron nitride nanosheets, 2-4 parts of a sintering aid, 0.01-0.1 part of polyvinyl alcohol, 1-3 parts of tetraethyl pentamethylene diamine and 1-3 parts of triethyl phosphate; (2) pretreating the modified boron nitride nanosheet; and (3) preparing the high-toughness aluminum nitride substrate.

The invention discloses a preparation method of light high-strength electromagnetic shielding and infrared stealth composite aerogel. The preparation method comprises the following steps: step 1, preparing a Ti3C2Tx MXene aqueous dispersion; step 2, pretreating the aramid paper honeycomb; step 3, preparing a polydopamine modified aramid paper honeycomb according to a product obtained in the step 2; step 4, preparing aramid paper honeycomb reinforced MXene-based composite hydrogel according to products obtained in the step 1 and the step 3; and step 5, freezing the aramid paper honeycomb reinforced MXene-based composite hydrogel obtained in the step 4 in liquid nitrogen, and drying to obtain the aramid paper honeycomb reinforced MXene-based composite aerogel. The invention also discloses the light high-strength electromagnetic shielding and infrared stealth composite aerogel prepared by the preparation method, and the aerogel has light weight, high strength and excellent electromagnetic shielding and infrared stealth performance, and meets the application requirements in the fields of aerospace, weaponry, electronics and electricity and the like.

The invention discloses lead-free perovskite Cs2NaHoBr6 as well as a fractal structure, a preparation method and application thereof, and belongs to the technical field of photoluminescence and fractal crystal growth. The lead-free perovskite Cs2NaHoBr6 is successfully synthesized through a novel solvent boiling method, and compared with a traditional fluorescence thermal quenching perovskite material, the lead-free perovskite shows thermally enhanced red light and near infrared light emission under excitation of ultraviolet light, blue light and near infrared light, has up-conversion and down-conversion luminescence capabilities, and can be used for preparing a luminescent material. The emission peak intensity is in positive correlation in the range of 293-593 K, and an abnormal heat quenching resistance behavior is shown. Cs2NaHoBr6 powder is dissolved in an anti-solvent, and a fractal structure pattern with preferred orientation and self-similarity characteristics is prepared by using an in-situ solution crystallization method, so that the temperature sensing performance of the compound is remarkably improved, the relative sensitivity of the compound is enhanced from 1.14% K <-1 > to 2.60% K <-1 >, and the compound shows a good application prospect in the aspect of non-contact optical temperature measurement.

The invention discloses a morphology-controllable Ti3C2T x MXene / Co / C composite material, preparation method and application thereof, the present invention prepares Ti3C2T by hydrothermal carbonization method x MXene / Co / C absorbing material. Different amounts of NH3·H2O are added to the precursor mixed solution to adjust the pH of the solution, change the surface energy of different crystal faces, change the growth mode of the crystal to a certain extent, and calcine to synthesize single-substance Co magnetic nanomaterials of different dimensions. The present invention breaks the limitations of traditional preparation methods. In the prepared absorbing material, the dosage of NH3·H2O in the precursor mixed solution can adjust the reaction speed of the pH value of the reaction system, thereby changing the growth rate of different crystal faces, and finally synthesizing single-substance Co particles of different morphologies. Among them, the block structure, the cut-angle columnar structure, and the nanorod structure have a larger surface area, which increases the reflection and scattering of the incident electromagnetic wave, effectively prolongs the propagation path of the electromagnetic wave, and brings more interface charge polarization, thereby improving the loss performance of the electromagnetic wave.

The invention discloses a multi-frequency sound wave analysis method based on reinforced concrete damage detection, and particularly relates to the technical field of multi-frequency sound wave analysis, and the method specifically comprises the steps: collecting multi-frequency emission information according to emitted multi-frequency sound waves, obtaining a frequency vacancy coefficient according to the multi-frequency emission information, collecting multi-frequency receiving information according to the received multi-frequency sound waves, and obtaining a frequency vacancy coefficient according to the frequency vacancy coefficient; a multi-frequency fusion coefficient is obtained according to the multi-frequency receiving information, a loss model is constructed according to the multi-frequency fusion coefficient and a frequency vacancy coefficient, a space loss index of the loss model is calculated, the space loss index is compared with a preset space loss threshold value, and an identification signal is generated according to a comparison result; an anomaly detection model is established according to the generated identification signal, classification evaluation is performed by using space loss index data of an abnormal state, and an intervention strategy is proposed according to a classification evaluation result, so that the problem of abnormal reinforced concrete damage detection fluctuation caused by frequency-by-frequency emission of multi-frequency signals is effectively solved; and the effectiveness and credibility of reinforced concrete damage detection are improved.

The invention provides a whole vehicle heat management system and a control method thereof, and belongs to the technical field of vehicle heat management, and the whole vehicle heat management system comprises a battery heat exchange loop, a motor heat exchange loop, a heat pump heat exchange loop, a first switching mechanism and a second switching mechanism. Wherein the heat pump heat exchange loop comprises a first main pipeline, an in-cabin heat exchange branch and a battery heat exchange branch, and the in-cabin heat exchange branch and the battery heat exchange branch are connected to the first main pipeline in parallel; the first switching mechanism enables the first main pipeline to be communicated with the in-cabin heat exchange branch and / or the battery heat exchange branch to form a loop, and guides the heat pump heat exchange loop to be switched between positive circulation and reverse circulation; the second switching mechanism enables the motor heat exchange loop and the battery heat exchange loop to be connected or disconnected. According to the whole vehicle heat management system, integrated heat management of the battery heat exchange loop, the motor heat exchange loop and the heat pump heat exchange loop is achieved, and the energy utilization rate of the vehicle is effectively increased.

The invention relates to a double half-Heusler alloy thermoelectric material with low lattice thermal conductivity and a preparation method thereof, the thermoelectric material is any one of a p-type thermoelectric material or an n-type thermoelectric material, the chemical formula of the p-type thermoelectric material is Sc0. 6V0. 5Co1-xNixSb, x is more than or equal to 0 and less than or equal to 0.12, and the n-type thermoelectric material is one of Sc0. 6V0. 5Co1-xNixSb. The chemical formula of the n-type thermoelectric material is Sc0. 5V0. 6Co1-yNiySb, wherein y is greater than or equal to 0 and less than or equal to 0.30. The preparation method comprises the following steps: mixing Sc, V, Co, Ni and Sb, grinding, sequentially carrying out sintering and vacuum packaging treatment to obtain a thermoelectric material wafer, and carrying out high-temperature annealing treatment on the thermoelectric material wafer to obtain the double half-Heusler alloy thermoelectric material with low lattice thermal conductivity. Compared with the prior art, the method has the advantages that the prepared double half-Heusler alloy thermoelectric material is replaced by the heterovalent elements, the Sc / V ratio is accurately regulated and controlled, p-type and n-type thermoelectric materials based on the same parent compound are successfully obtained, and the two materials both show promising thermoelectric performance.

The present application relates to the field of infrared light measurement, and specifically provides an infrared light detection device based on semi-metallic materials and a preparation method thereof. The device includes a substrate, a semi-metallic material layer is provided on the substrate, and electrodes and a polymer material layer are provided on the surface of the semi-metallic material layer away from the substrate. The electrodes are provided at both ends, and the polymer material layer is provided between the two electrodes, and the polymer material layer is not in contact with the electrodes. The present application also provides a preparation method for an infrared light detection device based on a semi-metallic material, and the method includes the following steps: step one, depositing a semi-metallic material layer on the surface of the substrate; step two, spin coating a polymer material layer on the surface of the semi-metallic material layer; step three, preparing electrodes on both ends of the polymer material layer on the semi-metallic material layer. In the device of the present application, the polymer material layer plays a role of thermal isolation, so that the temperature of the semi-metallic material layer is reduced, thereby improving the conductive performance and the detection accuracy is higher.

The invention belongs to the technical field of semiconductors, relates to a high electron mobility transistor (HEMT), and particularly provides a high-voltage GaN high electron mobility transistor with a stepped electric field auxiliary voltage-resistant layer, which is used for solving the problems of low breakdown voltage, high specific on-resistance, current collapse effect and the like of the traditional GaN HEMT device. The invention creatively provides a stepped electric field auxiliary voltage-withstanding layer structure for improving the breakdown voltage of the device, so that the electric field distribution between the grid electrode and the drain electrode of the device is more uniform, and the problem of electric field concentration caused by the fact that polarized charges are attracted by the grid electrode is solved, thereby greatly improving the breakdown voltage of the device and improving the reliability of the device. On the basis, the influence of current collapse on the device is weakened, and the reliability of the device is improved; according to the invention, a new design direction and thought are provided for the high-voltage GaN HEMT device, and commercial application of the high-voltage GaN HEMT device is facilitated.

The invention relates to a rare earth complex ink with scattering particles doped with a pyrazoloboron Ce (III) complex, and preparation and application thereof, and belongs to the field of light-emitting display. The scattering particles are introduced into the rare earth complex ink, so that the scattering of light can be effectively increased, the propagation path of light can be prolonged, the opportunity of absorbing light by the rare earth complex can be increased, the luminous efficiency can be enhanced, exciting light can be uniformly distributed, brightness spots and dark areas in printed patterns can be reduced, and the consistency of visual effects can be ensured; the light rays scattered in multiple directions can broaden the light-emitting angle, so that the pattern can keep a good light-emitting effect at different observation angles. In addition, by changing the propagation path of the light, the scattering particles reduce the retention time of the light in the rare earth complex, the self-absorption effect is reduced, and the luminous efficiency is further improved.

The invention discloses a novel carbonized polybenzoxazine aerogel and a preparation method thereof, the novel carbonized polybenzoxazine aerogel is prepared by carbonizing a novel polybenzoxazine aerogel, and the invention belongs to the technical field of aerogel materials. The preparation method comprises the following steps: preparing a polybenzoxazine solution; putting the polybenzoxazine solution into a mold to form wet gel; aging the wet gel, and drying at normal pressure for 24 hours after aging; the aged wet gel is washed with N, N-dimethylformamide, and wet conductive gel is obtained; and drying the wet gel at normal temperature and normal pressure to obtain the novel polybenzoxazine aerogel. The polybenzoxazine aerogel is subjected to heat preservation for 6 hours at the temperature of 800 DEG C in an argon environment to be carbonized, then furnace cooling is carried out, and the novel carbonized polybenzoxazine aerogel is obtained after the polybenzoxazine aerogel is cooled. The preparation method has the advantages that the bisphenol F type benzoxazine monomer is used as a raw material, and the preparation method is simple through acid catalytic polymerization and normal-pressure drying; compared with other aerogel materials, the aerogel disclosed by the invention has excellent electromagnetic shielding performance and relatively high resistivity.

The invention relates to the photovoltaic field, and provides a back contact battery and a manufacturing method thereof, a laminated battery and a photovoltaic module, and the back contact battery comprises a battery substrate which is provided with a first surface and a second surface which are opposite to each other; the isolating membrane is positioned on the first surface; the isolating membrane comprises at least two isolating units, the surface, far away from the first surface, of each isolating unit comprises a first area and a second area surrounding the first area, each isolating unit comprises a first part located in the first area and a second part located in the second area, the first part is provided with a groove sunken towards the battery substrate, and the edge, far away from the first part, of the second part is fluctuant; and an electrode on the second surface. The invention is at least beneficial to improving the light absorption and utilization rate of the back contact cell by means of the isolating membrane.

The present invention discloses a SnTe-based thermoelectric material and a preparation method thereof, and relates to the field of thermoelectric materials, and in particular to a SnTe-based thermoelectric material with a multi-scale nanocomposite structure and a preparation method thereof. 1‑x Y x Te-5%Cu2Te, wherein x is 0, 0.01, 0.03, 0.05 or 0.07, which is prepared by using a high-purity metal element as a raw material, according to the stoichiometric ratio of the chemical formula, and after vacuum flame sealing, melt reaction quenching, and high temperature annealing, it is ground into powder, and vacuum discharge plasma sintering is performed to obtain a bulk SnTe-based thermoelectric material. Compared with the prior art, the present invention optimizes the hole carrier concentration and band structure of the SnTe material by co-doping SnTe with Cu and Y. At the same time, increasing the Y solid solubility allows the in-situ formation of a multi-scale nanostructure in SnTe, further reducing its thermal conductivity, thereby greatly improving the thermoelectric performance of the SnTe material.

The application discloses a SnTe-based thermoelectric material and a preparation method thereof, and belongs to the technical field of thermoelectricity. The application adopts high-purity metal elements as raw materials, and the raw materials are mixed according to a stoichiometric ratio, and then a cast ingot is obtained through a melting reaction after vacuum packaging. Subsequently, the cast ingot is subjected to high-temperature annealing treatment. After the cast ingot subjected to the high-temperature annealing treatment is ground into powder, a dense block-shaped SnTe-based thermoelectric material is formed through discharge plasma sintering. The chemical formula of the SnTe-based thermoelectric material is Sn 2.9‑X W X Te 2.9 -(In2Te3) 0.03 -(Cu2Te) 0.18 The application significantly improves the thermoelectric figure of merit of the SnTe-based thermoelectric material and improves the thermoelectric performance of the SnTe-based thermoelectric material by doping tungsten elements in the SnTe matrix and compounding the two metal compounds of In2Te3 and Cu2Te.

The invention discloses a preparation method of a doped magnesium diboride superconducting wire. The preparation method comprises the following steps: drilling a plurality of holes in a nickel-based alloy ingot; adding an organic adhesive into the boron powder, mixing and extruding to obtain a boron tube; putting a magnesium-aluminum alloy rod into the boron tube to obtain a multi-core magnesium diboride composite ingot; carrying out cold drawing treatment to obtain a multi-core magnesium diboride wire rod; and carrying out copper plating and heat treatment on the multi-core magnesium diboride wire rod to obtain the magnesium diboride superconducting wire rod. According to the invention, the nickel-based alloy is used as a metal matrix, so that the wire rod does not generate surface cracks in the whole processing process, and the wire rod can be directly stretched to the final specification without introducing annealing; in the phase forming process, carbon atom doping is introduced, the critical current density of the magnesium diboride superconducting wire in an irreversible field and a high field is effectively improved, a magnesium-aluminum alloy rod with low aluminum content is adopted as a center magnesium source, and the upper critical magnetic field of magnesium diboride is improved.

The invention belongs to the technical field of matte films, and provides a high-haze matte film and a production method thereof. The high-haze matte film comprises a base film layer and a fog film layer, the weight ratio of the base film layer to the fog film layer is (0.2-0.7): (2.5-5), and the base film layer and the fog film layer are prepared through a co-extrusion process; the fog film layer comprises the following components in parts by weight: 30-60 parts of polyethylene, 10-30 parts of modified silicon dioxide, 10-30 parts of activated aluminum oxide, 5-10 parts of matting powder, 5-15 parts of a melt index regulator, 1-5 parts of an auxiliary agent and 0.5-2 parts of low-hydrogen silicone oil, wherein the density value of the polyethylene is 1.02-1.58 g / cm < 2 >. Compared with the prior art, the matt film contains the matting powder component and also contains the melt index regulator component, so that the technical effect of improving haze can be achieved by adjusting the molecular structure of polyethylene and increasing scattering of light in a polyethylene material, and the obtained matt film has the characteristic of high haze; the matte film has extremely high diffuse reflection performance and excellent shielding effect, and the matte effect is relatively good; and the appearance quality is better.

The invention relates to the technical field of thermoelectric materials, in particular to a high-flexibility silver telluride thermoelectric thin film with a pearl scallop structure and a preparation method and application of the high-flexibility silver telluride thermoelectric thin film. The non-stoichiometric silver telluride thermoelectric film with a pearl scallop structure is rapidly prepared through an intermittent co-sputtering process under the conditions of room temperature and fixed working air pressure; the pearl scallop structure obviously improves the mechanical property and the thermoelectric property of the silver telluride thermoelectric thin film; after the silver telluride thermoelectric thin film is bent and circulated for 5000 times, the surface has no crack, the resistance is only increased by 20%, and excellent flexibility is shown; and meanwhile, the power factor can reach 51.92 mu W m <-1 > K <-2 > under the room temperature condition, and the material has good thermoelectric performance, meets the requirements of flexible wearable thermoelectric devices, and has potential commercial application prospects.

This application relates to the field of textile fabrics, disclosing a three-dimensional anti-permeability fabric and its preparation process. The three-dimensional anti-permeability fabric includes a first woven layer and several second woven layers. The second woven layers are formed by weaving core-spun yarn onto the first woven layer using a weaving process. The edges of the second woven layers are formed by cutting and high-temperature setting of the core-spun yarn to create a three-dimensional plush structure. The core yarn of the core-spun yarn is made by twisting several high-melting-point yarns and at least one glass fiber yarn together, while the covering yarn is a low-melting-point yarn. The three-dimensional anti-permeability fabric obtained by this application, after cutting and high-temperature setting of the core-spun yarn at the edges of the second woven layers, shrinks the core-spun yarn to form a spiral shape, creating a three-dimensional plush structure at the edges of the second woven layer. Under the synergistic support of the core yarn and the shrunk covering yarn, a stable three-dimensional anti-permeability fabric is formed. It is not easily deformed during long-term wear and washing, maintaining good softness, three-dimensionality, and anti-permeability.

The invention belongs to the technical field of food processing, and relates to a melon rind source stabilizer, an extraction method thereof and application of the melon rind source stabilizer in watermelon juice. The extraction method comprises the following steps: S1, preparing watermelon peel pulp: taking inner peels of watermelons, adding water, and crushing into the watermelon peel pulp; step S2, alkaline hydrolysis ester removal: regulating and controlling a water medium microenvironment to enable the pH value of the melon rind pulp to be 10-13, and reacting at room temperature to remove methyl ester groups; then filtering and washing in sequence to obtain watermelon peel residues; and S3, low-temperature high-pressure homogenization and vacuum freeze drying are combined. The watermelon peel source stabilizer is extracted from watermelon inner peel pulp through alkaline hydrolysis ester removal and low-temperature high-pressure homogenization combined with vacuum freeze drying treatment, has a good network framework, and is not prone to molecular chain breakage, charge shielding or dehydration shrinkage in ultrahigh-pressure sterilization, so that the stability of watermelon juice is improved, and the stability of the watermelon juice is improved. Particularly, the double-effect stability of lycopene and juice in the watermelon juice can be regulated and controlled.

The utility model relates to a kind of wave-absorbing assembly and electromagnetic darkroom, belong to the technical field of electromagnetic compatibility test.It solves electromagnetic darkroom wave-absorbing efficiency and maintenance problem by grid-shaped arrangement modular unit;Specifically, each absorbing unit adopts split design: the first wave-absorbing part is fixed on the substrate, and the replaceable second wave-absorbing part with wedge shape is connected vertically above the first wave-absorbing part through interference fit convex-concave structure;Annular wave-absorbing cavity with built-in concave-convex surface is formed between adjacent units, forcing multi-path reflection attenuation of gap electromagnetic wave.The utility model is combined with the grid substrate of shielding wall integrated molding and configures absorbing unit on the substrate, realizes efficient absorption of electromagnetic wave and local replacement of wedge body, significantly reduces secondary reflection and maintenance cost.

The invention discloses a biochar-based organic pollutant adsorption material, which relates to the technical field of organic pollutant adsorption. The biochar-based organic pollutant adsorption material is a porous zeolite modified with a quaternary ammonium salt containing a long chain of an alkane as a carrier, and a series of reactions are carried out with a surface-coated nano-SiO 2 Nano-TiO 2 、Load Fe 3 O 4 The modified porous zeolite containing long alkane chains enhances the adsorption of polycyclic aromatic hydrocarbons. 2 Nano-TiO 2 Improve the utilization rate of visible light and quickly oxidize the adsorbed polycyclic aromatic hydrocarbons into non-toxic substances, load Fe 3 O 4 The biochar enables the adsorption material to be collected by magnetic adsorption. The biochar-based organic pollutant adsorption material of the present invention has strong adsorption performance for polycyclic aromatic hydrocarbon organic pollutants, high environmental protection, low cost and other advantages, and is worthy of promotion.

The invention discloses a preparation method of a silver-based high-reflectivity back electrode material, and relates to the technical field of electronic materials. An acid modified copper plate is used as an electrode material substrate, positively charged polystyrene microspheres are adsorbed and are autonomously arranged to form a seed layer, then generated silver nanorods are effectively fixed on the surface of the copper plate by means of gaps among the polystyrene microspheres and negative charges on the surface of the copper plate, and then in the SnCl4 atmosphere, the silver nanorods are effectively fixed on the surface of the copper plate. Plasma enhanced heating treatment is carried out, a silver nitrate solution is gradually converted towards the direction of nano-silver crystals along with solvent removal, nano-silver and Sn elements are combined under the combined action of plasma and a high-temperature environment, polystyrene microspheres are heated and removed along with the prolonging of reaction time, a nano-rod array is formed, total reflection of light can be reduced, and the light emitting efficiency is improved. The light scattering is increased, the light extraction rate of the LED is effectively improved, meanwhile, due to the existence of the Sn element, the contact between sulfide and silver can be reduced, and the possibility of vulcanization of the electrode material is reduced.

The invention discloses a composite yarn and fabric with anti-perspective and anti-ultraviolet functions, the composite yarn comprises a yarn main body, the yarn main body comprises modified extinction fibers F1 and super extinction fibers F2, the mass ratio of the modified extinction fibers F1 in the yarn main body is 20%-40%, and the TiO2 concentration in the modified extinction fibers F1 is larger than or equal to 1 wt%; the mass ratio of the super-extinction fibers F2 in the yarn main body is 60%-80%, the concentration of TiO2 in the super-extinction fibers F2 is larger than or equal to 3 wt%, and the average particle size of TiO2 particles is smaller than or equal to 500 nm; the boiling water shrinkage rate of the modified delustering fiber F1 is greater than that of the super-delustering fiber F2, the boiling water shrinkage rate of the modified delustering fiber F1 is greater than or equal to 20%, and the boiling water shrinkage rate of the super-delustering fiber F2 is less than or equal to 4%. When the composite yarn is applied to the fabric, the coverage rate is larger than or equal to 70%, and the fabric has the characteristics of being anti-perspective, anti-ultraviolet and cotton-like.

The utility model discloses a silencer for an air compressor and the corresponding air compressor, and relates to the technical field of air compressors, an air inlet is formed in the side wall of a shell, an air outlet is formed in the bottom of the shell, and a cavity communicated with the air inlet and the air outlet is formed in the shell, so that air enters the cavity from the air inlet, and the air inlet is communicated with the air outlet; the air inlet is further connected with an air inlet pipe, a silencing part is arranged on the air inlet pipe and can absorb noise generated by the air inlet pipe, a plurality of partition plates are arranged at the air outlet and divide the air outlet into a plurality of sub air outlets, and the sub air outlets enable the air velocity to be reduced; the air inlet and the air outlet of the air compressor are communicated with each other, so that noise generated by high-speed air flow is reduced, reflection and scattering of the air flow at the air outlet are increased by the partition plate, noise propagation is further reduced, noise generated in the air suction and exhaust processes of the air compressor can be reduced by mounting the silencing device on the air inlet and the air outlet of the air compressor, and a quieter operating environment is realized.

The invention discloses a preparation method of a photocatalyst material, and belongs to the technical field of material preparation and pollution treatment. The method comprises the following steps: by taking bismuth citrate as a multifunctional precursor, firstly mixing the bismuth citrate with a titanium source, a manganese source and a cerium source in a solvent for gelation, then carrying out solvothermal reaction to form an intermediate, and finally carrying out programmed temperature control pyrolysis in an inert and oxygen-containing atmosphere. In the pyrolysis process, carbon element doping and manganese and cerium bimetal ion lattice embedding are synchronously realized, and a graded porous folded structure is constructed in situ by utilizing precursor decomposition gas. The method integrally solves the problems of weak visible light response, low mass transfer efficiency and poor stability of a traditional material, and the prepared material shows efficient inhibition and degradation efficiency on mold such as aspergillus flavus under simulated granary low-illumination visible light.

The application discloses a preparation method and application of a PTFE biomimetic membrane based on a photocatalysis-filter coupling mechanism. The method comprises the following steps: firstly, blending polytetrafluoroethylene (PTFE) and a photocatalyst in a solvent; sequentially performing pushing, rolling, longitudinal stretching, transverse-longitudinal stretching and heat treatment operations on the blended slurry; and finally obtaining the PTFE biomimetic membrane with photocatalysis-filter functions. The PTFE biomimetic membrane can be used for air purification, atmospheric dust removal, industrial waste gas filtration and the like. The application adopts a photocatalysis free oxygen negative ion generation mechanism, orderly embeds isotactic photocatalysts and constructs a micro-rough surface to realize air purification efficiency improvement, pollutant screening and anti-pollution performance. In addition, the orderly arranged photocatalysts can greatly improve light scattering, and then improve the photocatalyst efficiency of the material.

The invention provides a method for preparing a high-performance skutterudite compound through composite modification of carbon quantum dots. According to the method for preparing the high-performance skutterudite compound through composite modification of the carbon quantum dots, the carbon quantum dots are compounded into a CoSb3-based skutterudite thermoelectric material by adopting a rapid ultrasonic oscillation method of a carbon dot solution according to the characteristics that the carbon quantum dots are easily dissolved in water or an organic solvent and can be uniformly dispersed; according to the preparation method of the CoSb3-based skutterudite thermoelectric material, the carbon quantum dots can quickly enter a mesoporous system of CoSb3-based skutterudite, so that the carbon quantum dots are uniformly dispersed into the CoSb3-based skutterudite thermoelectric material to achieve a uniform compounding effect, and then the CoSb3-based skutterudite thermoelectric material is prepared by combining SPS sintering. The CoSb3-based skutterudite thermoelectric composite material has the advantages that the requirements of rapid and uniform compounding are met, the purposes of simplifying the compounding process and optimizing the process are achieved, and the CoSb3-based skutterudite thermoelectric composite material with better thermoelectric performance can be obtained; according to the method, the common traditional method for improving the thermoelectric performance of the existing CoSb3-based skutterudite thermoelectric material by doping, filling and compounding metal nanophases is broken through.