664 results about "Ultrasonic oscillation" patented technology

The invention relates to the technical field of electrolytic refining, and provides an electrochemical device and method for extracting metal from molten salt. The electrochemical device comprises an anode, a cathode, an insulating container, an electrolytic bath and an ultrasonic stirring device. The cathode comprises a conductive part and liquid metal; the insulating container is provided with a containing space, the top side of the containing space is open, the liquid metal is contained in the containing space, and a part of the conductive part is inserted into the liquid metal; the electrolytic bath is provided with a containing cavity used for containing molten salt, the insulating container can be used for being immersed in the molten salt so that liquid metal can make contact with the molten salt, and one part of the anode is used for being inserted into the molten salt; a portion of the ultrasonic stirring device is inserted into the liquid metal for oscillating the liquid metal. The liquid metal is subjected to ultrasonic oscillation in the electrolysis process, so that the possibility that metal dendrites are formed on a reduction product or a high-melting-point alloy layer is formed on the surface of the liquid metal is effectively reduced, the reaction efficiency of electrolytic extraction is improved, and the quality of the extracted reduction product is improved.

The invention provides a gradient crosslinking process of photosensitive resin for photocuring 3D printing, and relates to the technical field of photocuring 3D printing materials. The gradient crosslinking process of the photosensitive resin for photocuring 3D printing comprises the following steps: S1, based on double-initiator system design, adopting molecular dynamics simulation screening, respectively adding a 405nm sensitive type TPO-L initiator and a 365nm sensitive type I TX initiator into an epoxy acrylate prepolymer, and verifying initiation energy barrier matching through quantum chemistry calculation, and generating a pre-initiation gradient resin formula. Through molecular dynamics simulation, initiator combinations are screened, energy barrier matching is verified, the ratio of dual-wavelength sensitive initiators is optimized, and accurate triggering of surface layer and deep layer cross-linking reaction is ensured. And a three-roller grinding and dispersing process is combined with ultrasonic oscillation to eliminate nanoparticle aggregation, so that the mechanical uniformity and light scattering effect of a resin system are improved.

An ultrasonic transducer device including a substrate and an ultrasonic oscillation unit is provided. The ultrasonic oscillation unit is disposed on the substrate. The ultrasonic oscillation unit includes a first electrode layer, a first insulating layer, a second electrode layer, a second insulating layer, a plurality of capacitor protrusions, and a cavity located between the first insulating layer and the second insulating layer. The capacitor protrusions are disposed in the cavity by being disposed on at least one of the first insulating layer and the second insulating layer. The first insulating layer and the second insulating layer are separated by a gap and are located between the first electrode layer and the second electrode layer. The height of each of the capacitor protrusions is less than a height of the gap.

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a sodium ferric sulfate composite positive electrode material and a preparation method and application thereof. The preparation method of the sodium ferric sulfate composite positive electrode material provided by the invention comprises the following steps: (1) preparing a carbon-coated sodium ferric sulfate positive electrode material, mixing the sodium ferric sulfate positive electrode material with a citric acid solution, and performing ultrasonic treatment to obtain a modified sodium ferric sulfate positive electrode material; (2) stirring and mixing the modified sodium ferric sulfate positive electrode material and a composite conductive agent, shearing and dispersing, and carrying out ultrasonic oscillation, wherein the rotating speed of stirring and mixing is less than or equal to 2000rpm; the rotating speed of the shearing dispersion is greater than or equal to 5000rpm. The sodium ferric sulfate composite positive electrode material provided by the invention has relatively low shear viscosity and relatively high thixotropic index under the condition that the solid content is greater than or equal to 65%.

The invention provides a biochar composite porous material for heavy metal contaminated soil remediation and a preparation method and application of the biochar composite porous material. The preparation method comprises the steps that biomass raw materials are subjected to high-temperature pyrolysis carbonization and then smashed, ground and sieved, and biochar powder is obtained; dispersing in a phosphoric acid solution to obtain a biochar solution, and filtering, washing and drying after a hydrothermal activation reaction to obtain activated biochar; dispersing in a chitosan solution, carrying out ultrasonic oscillation, filtering, washing and drying to obtain modified charcoal; mixing sodium bentonite, attapulgite and deionized water, uniformly mixing the modified charcoal, the functional slurry and a sodium carboxymethyl cellulose solution to obtain composite slurry, performing compression molding to obtain a green body, and then drying and calcining the green body. The biochar composite porous material prepared by the invention can simultaneously play multiple roles of physical adsorption, chemical chelation, ion exchange and the like in a heavy metal contaminated soil treatment process, so that efficient fixation of various heavy metal ions is realized.

The invention relates to a cleaning method for removing pollutants deposited on the surface of a fluoride coating heater. The cleaning method comprises the specific steps that appearance inspection is conducted on a part, and a universal meter is used for detecting a resistor; the binding post part is protected; a white corundum sand material is used for sand blasting and film removal; blowing through an air gun; carrying out deprotection and washing; the heater is right placed in an ultrasonic cleaning tank, deionized water is used for ultrasonic cleaning, and the part is rotated by 90 degrees once every 3 min; wiping with isopropyl alcohol; the part is put into an ultrasonic cleaning tank to be cleaned, the part is rotated by 90 degrees once every 3 min, and whether marks are generated or not is observed; purging with nitrogen; performing drying; performing inspection; and vacuum packaging. The white corundum sand material is used for conducting sand blasting and film removing treatment on the surface of the component, a small amount of residual pollutants on the surface of the component can be rapidly removed, and it is guaranteed that the surface of the component keeps uniform; and the part is rotated once every 3 minutes during ultrasonic cleaning, so that the surface can be controlled not to generate marks due to ultrasonic oscillation.

The invention discloses a recovery device and reutilization method for silicon in a waste photovoltaic module, the recovery device comprises an equipment base, an acid pickling recovery pool, a circulating liquid washing mechanism and a clamping seat, the acid pickling recovery pool is fixedly installed on the surface of the equipment base, a high-pressure air pump is fixedly installed on one side of the equipment base, and the high-pressure air pump is fixedly installed on the other side of the equipment base; an aerator communicated with the output end of the high-pressure air pump is arranged on the bottom face of the acid pickling recycling pool, a liquid injection end pipe and a circulation pipeline are arranged on the top face and one side of the acid pickling recycling pool respectively, and the circulation liquid washing mechanism is fixedly installed on the inner side of the acid pickling recycling pool. According to the invention, the automatic ultrasonic pickling structure is arranged, the pickling recovery pool is used for filling the chemical solvent, the cavitation effect is formed on the surface of the silicon wafer carried by the pickling solution through ultrasonic oscillation in solvent pickling, the silicon wafer and EVA are separated, more than 99% of polymer is removed from the PV module, and the processed silicon wafer is good in integrity; the silicon wafer is almost free of fracture damage, and the recovery value is improved.

The invention belongs to the technical field of petrochemical engineering, and particularly relates to a thermal auxiliary material for promoting alkane dehydrogenation reaction efficiency and a preparation method and application thereof. The auxiliary material is composed of a heating main body, a heat storage carrier, a stabilizing auxiliary agent and a carrier auxiliary agent. Wherein the component of the heating main body is CuO; the component of the heat storage carrier is CaO-Al2O3 composite oxide; the stabilizing auxiliary agent is one or more of Cr2O3, La2O3, CeO2 and ZrO2; and the carrier auxiliary agent is one or more of MgO, BaO, NiO and Fe2O3. The thermal auxiliary material with high mechanical strength, high heat transfer performance and high stability is synthesized through the steps of coprecipitation reaction, high-temperature hydrothermal reaction, high-temperature calcination, vacuum impregnation, ultrasonic oscillation and the like; when the material is applied to an alkane dehydrogenation olefin preparation device, alkane conversion rate and olefin selectivity can be improved, the service life of a catalyst can be prolonged, and energy consumption of the device can be reduced.

The invention relates to the technical field of precious metal recovery, in particular to a precious metal recovery method. Comprising the following steps: filtering wastewater containing precious metals by using a precious metal recovery composite membrane, and drying the precious metal recovery composite membrane after filtering; then filtering an acidic aqueous solution by using the dried precious metal recovery composite membrane, and then continuously filtering and cleaning by using clear water; the cleaned precious metal recovery composite membrane is put into an N, N-dimethylformamide soaking solution, then ultrasonic oscillation treatment is conducted, the composite membrane is taken out of the soaking solution, then centrifugal treatment is conducted on the soaking solution, precipitates are collected, and the precious metal particles are obtained. The precious metal is recovered by adopting a membrane filtration method, and compared with an impregnation method, a large amount of membrane cost is saved, so that the precious metal recovery cost is reduced, and the method is suitable for industrial metal recovery.

The preparation device comprises a mixing tank, a stirring device and a microbubble generating device are arranged in the mixing tank, the microbubble generating device is composed of a bottom mounting disc and a side wall mounting ring, microbubbles are injected through a first micropore and a second micropore respectively, and the micropores are conical and coated with hydrophobic nano coatings. The pulse airflow device controls airflow through an electromagnetic pulse valve to generate microbubbles. An ultrasonic oscillation device is further arranged at the bottom of the mixing tank, the stirring device comprises a high-shear stirring structure and an auxiliary stirring structure, and the mixing efficiency is enhanced through reverse driving. The preparation method comprises the steps of feeding, micro-bubble injection, gas-liquid synergistic emulsification, gas-liquid auxiliary emulsification and ultrasonic oscillation. Through the synergistic effect of microbubble injection, high shear and ultrasonic oscillation, the mixing uniformity of peanut oil and ingredients is improved, and the mixing time is shortened. The microporous coating and pulse adjustment ensure stable operation of the device, the maintenance period is prolonged to once a month, and the device is suitable for industrial production.

An ultrasonic transducer device includes a substrate, an ultrasonic oscillation unit, a ground signal line, a DC voltage signal line and an AC voltage signal line. The substrate includes an active component area and a wiring area located around the active component area. The ultrasonic oscillation unit includes a first electrode layer, a second electrode layer, a third electrode layer and a cavity. The first electrode layer is located on a first side of the cavity, and the second electrode layer and the third electrode layer are located on a second side of the cavity. The ground signal line, disposed in the wiring area, is electrically connected to the first electrode layer. The DC voltage signal line, disposed in the wiring area, is electrically connected to the second electrode layer. The AC voltage signal line, disposed in the wiring area, is electrically connected to the third electrode layer.

The invention provides a novel metal organic framework material reinforced carbon dioxide trapping solvent and a preparation method thereof, and relates to the field of gas adsorbents. Comprising the following steps: S1, dissolving nickel salt, cobalt salt and zinc salt in water to obtain a metal salt solution; s2, uniformly mixing 2, 5-dihydroxyterephthalic acid and N, N-dimethylformamide, then adding 1-methylimidazole and ethanol, and uniformly mixing to obtain a ligand solution; s3, mixing the metal salt solution with the ligand solution, adding the mixture into a microwave reactor for reaction, filtering and drying to obtain an organic framework material; and S4, dispersing the organic framework material in deionized water, then adding an organic amine aqueous solution and a silane coupling agent, uniformly stirring, then adding an imidazolium ionic liquid, and carrying out ultrasonic oscillation to obtain the composite material. The carbon dioxide trapping solvent takes a metal organic framework material as a carrier, and the metal organic framework material is functionally modified and is matched with imidazole ionic liquid, so that the adsorption efficiency and the stability of the trapping solvent can be improved.

The invention relates to the technical field of ultrasonic frozen squid processing, in particular to a processing device for preparing frozen squids by utilizing an ultrasonic technology, which comprises a pre-freezing room, a first ice glazing room is arranged on the side surface of the pre-freezing room, a first ultrasonic ice glazing machine is arranged on the inner side of the first ice glazing room, a quick freezing room is arranged on the side surface of the first ice glazing room, and a second ultrasonic ice glazing machine is arranged on the inner side of the quick freezing room. A second ice glazing room is arranged on the side face of the quick freezing room, a second ultrasonic ice glazing machine is arranged on the inner side of the second ice glazing room, and a freezing room is arranged on the side face of the second ice glazing room; the first ultrasonic ice glazing machine and the second ultrasonic ice glazing machine are arranged, the frozen storage quality of squids is improved through the layered ice glazing technology, bubbles of ice glazing liquid are eliminated through ultrasonic oscillation, and the transparency and adhesive force of an ice layer are improved.

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 invention provides a preparation method of a three-dimensional structure ferrous phosphate pigment with corrosion early warning capability, which comprises the following steps: preparing a ferrous ion-containing solution for providing ferrous ions, the ferrous ion-containing solution contains soluble ferrite and a surfactant and does not contain oxidizing ions, the ferrous ion-containing solution is in an acidic environment; preparing an initial mixed solution for providing phosphate ions and ammonium ions; atomizing and spraying the initial mixed solution into a ferrous ion-containing solution to obtain an intermediate mixed solution, carrying out ultrasonic refining on the intermediate mixed solution by utilizing an ultrasonic oscillation and microwave heating auxiliary device, heating and carrying out heat preservation to obtain a final mixed solution; and filtering the precipitate in the final mixed solution, transferring the precipitate to a vacuum environment, and carrying out high-temperature heating treatment to obtain the three-dimensional structure ferrous phosphate pigment with the corrosion early-warning capability, which can have the corrosion early-warning capability.

The invention relates to the technical field of alloy processing, and discloses a high-performance corrosion-resistant nickel-based alloy plate and a preparation method thereof, and the method comprises the following steps: raw material preparation, smelting treatment, casting treatment, hot rolling treatment, solution treatment, aging treatment and surface passivation treatment. According to the invention, when a composite acid system is adopted for passivation treatment, the concentration of chromium / molybdenum atoms in a passivation film is optimized and balanced due to the specific ratio of nitric acid to chromic acid, a chromium oxide provides a compact passivation barrier, and a molybdenum oxide endows the film layer with a self-repairing characteristic to synergistically inhibit pitting nucleation; meanwhile, nano titanium dioxide particles pretreated by silane are embedded into the passivation film in situ under the action of ultrasonic oscillation, organic pollutants adsorbed on a film layer can be decomposed by the photocatalytic characteristic of the nano titanium dioxide particles, the local corrosion effect of a battery caused by dirt coverage is avoided, and the performance of the battery is improved through double upgrading of components and the structure of the passivation film. And the alloy plate has excellent pitting corrosion resistance and fouling resistance in a chloride ion-containing medium.

The invention discloses a high-activity graphene quantum dot and a preparation method thereof, and relates to the technical field of oilfield chemistry, and the preparation method comprises the following steps: uniformly ground carbon source and nitrogen source are mixed, heated, fully reacted and cooled, uniformly dispersed in deionized water by ultrasonic waves, and then subjected to suction filtration, dialysis and freeze drying to obtain the nitrogen-containing graphene quantum dot. The preparation method comprises the following steps: dispersing nitrogen-containing graphene quantum dots, fatty alcohol-polyoxyethylene ether carboxylic acid and a catalyst in absolute ethyl alcohol, carrying out ultrasonic oscillation for 30 minutes, carrying out reflux reaction, and carrying out reduced-pressure rotary evaporation, thereby obtaining the nitrogen-containing graphene quantum dots. The prepared high-activity graphene quantum dots are small in particle size, high in activity and capable of entering small pores to peel crude oil, so that the recovery efficiency can be remarkably improved, the point injection allocation process is simple, the high-activity graphene quantum dots can be rapidly dispersed into injected water, an additional injection allocation device is not needed, and the construction cost is low.

The invention discloses a method for producing active lime by calcining limestone, which comprises the following steps of: crushing limestone raw ore, cleaning to remove mud, and removing magnetic components by using a magnet to obtain limestone powder with the particle size of less than 3mm; then adding limestone powder into a 1-2 mol / L sodium hydroxide solution with the weight 3-5 times that of the limestone powder, carrying out ultrasonic oscillation treatment, filtering to obtain a solid I, washing to be neutral, stirring and dispersing in a dispersion liquid, carrying out microwave irradiation under the condition of an alternating magnetic field, and filtering to obtain a solid II, so as to obtain pretreated limestone powder; freezing the pretreated limestone powder under a static magnetic field condition to obtain frozen limestone powder; and finally, mixing and calcining the pretreated limestone powder and carbon dioxide adsorption balls with the particle size of 10-15mm, and separating to remove the carbon dioxide adsorption balls, thereby obtaining the active lime. The obtained active lime is high in calcium oxide content, few in impurities, high in activity degree and good in stability.

The invention relates to the technical field of phase change heat transfer, and particularly discloses a multi-field coupling enhanced phase change heat transfer visualization experiment research device which comprises a vacuum cavity provided with a heat exchange block mounting hole, an auxiliary cooling device mounting hole, first to fifth thermocouple mounting holes, a wire mounting hole, an electric field, a magnetic field mounting position and an electromagnetic wave incident port. The heat exchange block is mounted in the heat preservation sleeve; the auxiliary cooling device is mounted in the auxiliary cooling device mounting hole; a heating rod mounting hole is formed in the bottom of the end cover; the heating rod is mounted in the heating rod mounting hole; the heat preservation sleeve is installed in the heat exchange block installation hole and provided with an ultrasonic oscillation generating device installation position. The electric field-magnetic field generating device is provided with an electric field generating device and a magnetic field generating device. The influence of the superheat degree and the supercooling degree on enhanced thin liquid film boiling heat transfer and enhanced condensation heat transfer can be researched by changing the heating rod and the heat exchange fluid flow.

The invention discloses application of a microelement complex in a feed additive, which comprises the following steps: mixing fresh kelp and water with the same mass as the fresh kelp, grinding and pulping to obtain kelp slurry, then adding compound enzyme into the kelp slurry, stirring and mixing uniformly, continuously adding boric acid and ammonium molybdate tetrahydrate under a magnetic field condition, stirring and mixing uniformly, and carrying out enzymolysis and chelation under an ultrasonic condition; sequentially adding zinc sulfate heptahydrate, ferrous sulfate heptahydrate, copper sulfate pentahydrate, cobaltous sulfate heptahydrate and manganese sulfate tetrahydrate while stirring, carrying out chelation reaction under a magnetic field condition, and centrifuging to take supernatant, so as to obtain a seaweed chelating solution; then adding maltose into the seaweed chelating liquid, uniformly stirring and mixing, continuously adding sodium selenite, and carrying out chelation reaction under the condition of a high-voltage pulsed electric field; and finally, continuously adding a beta-calcium polymalate aqueous solution under a magnetic field condition, carrying out ultrasonic oscillation treatment, and carrying out spray drying to obtain a complex of trace elements. The obtained complex of the trace elements can be used for preparing a feed additive, raw material sources are safe, and the complex has an obvious promoting effect on animal growth.

The invention belongs to the technical field of glass for buildings, and discloses a thermochromic intelligent window based on a vanadium dioxide nanoparticle film concentration gradient structure and a preparation method thereof.The preparation method comprises the steps that firstly, two parts of W-VO2 nanoparticles with different masses and PVP are added into absolute ethyl alcohol to be subjected to ultrasonic oscillation, and the W-VO2 nanoparticles and PVP are stirred to be evenly distributed and then stand for use; the method comprises the following steps: sequentially coating the surface of a pretreated glass substrate with W-VO2amp with relatively high concentration from bottom to top; a PVP dispersion liquid, a PMMA dispersion liquid, and low-concentration W-VO2amp are added; a PVP dispersion liquid; therefore, a W-VO2 gradient structure with low concentration at the top layer and high concentration at the bottom layer is formed on the surface of the glass substrate. The visible light transmittance of the thermochromic intelligent window is greatly improved, meanwhile, the solar modulation capacity is improved, the antagonism between the two optical properties of the visible light transmittance and the solar modulation efficiency is weakened or even broken through, and thermochromic development of the intelligent window and the radiation refrigeration field is further promoted.

The invention discloses a preparation method of a porous copper foil based on a hydrogel template and the porous copper fores.The method comprises the steps that firstly, a hydrogel solution is applied to the surface of a cathode roller in a spraying mode, and a hydrogel shielding point array is formed by means of the self-polymerization characteristic of the hydrogel solution; secondly, performing electrolysis operation by taking a cathode roller area outside the shielding point as a deposition site to prepare a composite copper foil mingled with the hydrogel shielding point; and then, stripping the composite copper foil from the cathode roller, placing the composite copper foil in an alkaline solution for ultrasonic treatment for 0.5-5 minutes, so that the hydrogel shielding point is swelled and then falls off through ultrasonic oscillation, and a pure porous copper foil is obtained. And finally, performing surface treatment on the porous copper foil by adopting a passivation solution to improve the stability of the porous copper foil. According to the method, accurate regulation and control of the porous structure are achieved through the hydrogel template, the preparation process is green and efficient, and the obtained porous copper foil is uniform in pore distribution, large in specific surface area and good in mechanical property.

The invention discloses a preparation method and application of an ultrathin large-size hexagonal boron nitride nanosheet capable of being produced on a large scale, and belongs to the technical field of two-dimensional material preparation. The method comprises the following steps: 1, preparing a boron nitride dispersion solution; 2, performing ultrasonic oscillation on the boron nitride dispersion liquid by using an ultrasonic processor; 3, stirring the boron nitride dispersion liquid subjected to ultrasonic pretreatment at an ultra-high speed by using a wall breaking machine; and 4, centrifuging the stirred boron nitride, taking supernate, washing and drying to obtain the ultrathin large-size boron nitride nanosheet. The preparation method disclosed by the invention has the characteristics of simplicity, high efficiency, economy, environmental protection, high yield, high reliability, large-scale preparation and the like, and the prepared boron nitride nanosheet has the advantages of large sheet diameter, small thickness, uniform particles, high lattice integrity and the like, and can be applied to the fields of thermal management, energy storage and photoelectrochemistry of electronic devices.

The invention provides a flexible surgical robot for removing deep cerebral hematoma through transcranial window ultrasonic oscillation. The flexible surgical robot comprises a feeding driving mechanism, an endoscope sheath, a suction arm mechanism and an ultrasonic arm mechanism. The flexible continuum robot composed of the feeding mechanism, the suction arm mechanism connected in parallel and the ultrasonic arm mechanism can achieve six-degree-of-freedom precise operation, and in addition, when a six-degree-of-freedom mechanical arm is applied in vitro, an endoscope sheath can smoothly enter the brain as soon as possible; the maneuverability of the structure is further improved through the rough operation of the six-degree-of-freedom mechanical arm and the six-degree-of-freedom fine operation of the flexible robot, the requirement for flexibility of the intracerebral hematoma minimally invasive surgery is met, the positioning capability is precise, the operation mode is flexible, the repeatability is high, and the practicability is high. The efficiency is high; the operation time of a patient is reduced; the damage to a human body is extremely low; compared with an existing surgical tool, surgical difficulty is lowered, surgical efficiency is improved, patient wounds are reduced, and patient safety is further guaranteed.

The present solution provides a preparation method for a three-dimensional structured ferrous phosphate pigment with corrosion early warning capability, including following steps: preparing a ferrous ion-containing solution for providing ferrous ions, where the ferrous ion-containing solution includes a soluble ferrous salt and a surfactant but no oxidizing ions, and the ferrous ion-containing solution is maintained in an acidic environment; preparing an initial mixed solution for providing phosphate ions and ammonium ions; and performing ultrasonic refinement, heating, and holding on the intermediate mixed solution using an auxiliary device with ultrasonic oscillation and microwave heating functions to obtain a final mixed solution; and filtering out precipitates from the final mixed solution, and then transferring the precipitates to a vacuum environment for high-temperature heating treatment to obtain a three-dimensional structured ferrous phosphate pigment with corrosion early warning capability.

The invention discloses an LIBS (Laser-induced Breakdown Spectroscopy) method for detecting heavy metals in wheat based on round hole constrained ultrasonic extraction, which comprises the following steps: mixing wheat powder and a hydrochloric acid solution, performing ultrasonic oscillation and centrifugal separation, and extracting supernate; dropwise adding the supernatant into a circular hole restraint sheet attached to a glass slide, and drying to obtain a sample; and measuring the LIBS spectrum of the sample in an inert gas atmosphere by adopting an LIBS method, taking the characteristic spectral line intensity of the Cd element in the LIBS spectrum as input, and obtaining the Cd element concentration of the sample based on the established calibration curve, thereby completing the detection of the Cd element in the wheat. According to the method, the coffee ring effect of the UAE method is improved, and the spectrum stability is improved. By adopting the CHC-UAE method, the LIBS technology can realize high-sensitivity detection of harmful heavy metal Cd in wheat, the stability of the LIBS spectrum is improved, and the requirements of actual application of heavy metal detection in wheat are met.

The invention discloses a denatured light diffusion particle, a preparation method and a diffusion film, and the preparation method of the denatured light diffusion particle comprises the following steps: carrying out ultrasonic oscillation on PMMA spherical diffusion powder with the particle size of 3-15 [mu] m and the refractive index of 1.49 in absolute ethyl alcohol and deionized water with the ratio of 2: 1 to obtain a PMMA powder mixed solution; heating the PMMA mixed solution to 90 DEG C, slowly adding the PMMA mixed solution with the temperature of 90 DEG C into water-based aluminum paste, and performing reflux stirring at the constant temperature of 90 DEG C for 6 hours to obtain a modified solution; performing vacuum filtration on the modified solution to obtain a filter cake, and cleaning the filter cake with absolute ethyl alcohol for three times during vacuum filtration; heating the filter cake to 120 DEG C, and drying at 120 DEG C for 12 hours to obtain a block material; and crushing the block material to obtain the denatured light diffusion particles. The denatured light diffusion particles are coated in a light diffusion layer of a diffusion film, so that the brightness of the diffusion film can be improved.

The invention discloses a super-smooth anticorrosive coating for an overhead transmission conductor and a preparation method and application thereof.The super-smooth anticorrosive coating for the overhead transmission conductor is prepared from, by mass, 25-50 parts of polyvinyl fluoride resin, 12-50 parts of epoxy resin, 5-10 parts of butyl acetate, 5-10 parts of graphite fluoride, 5-8 parts of molybdenum disulfide, 5-20 parts of superfine aluminum oxide and 6-25 parts of zinc powder. And 1-12.5 parts of zinc phosphate. Surface modification and dynamic coating are carried out on the super-smooth filler particles, so that a layer of chemical inert film is formed on the surface of the filler, and the friction force between the particles and between the particles and a matrix is reduced. Meanwhile, a multi-stage dispersion technology is adopted, low-speed stirring is firstly carried out for primary mixing, and then gradual speed increasing is combined with ultrasonic treatment, so that aggregates of the filler can be fully destroyed, and a stable dispersion state is formed. The treatment can form a highly uniform super-lubricity network structure, improve the interface bonding between the filler and the matrix resin, reduce micropores in the coating and reduce the friction coefficient of the coating, so that the coating shows super-lubricity. And through ultrasonic oscillation treatment, preservative particles reach the nanoscale, the surface area and chemical activity of the particles are increased, the particles and matrix resin form more stable combination, and the anticorrosive effect of the coating is effectively improved.

The invention relates to a super-hydrophobic thermal management composite coating synthesized by modified spent bleaching clay and a preparation method thereof. The preparation method comprises the following steps: carbonizing a part of spent bleaching clay powder in a tubular furnace; carrying out air burning oxidation treatment on one part of spent bleaching clay powder in a tubular furnace; the method comprises the following steps: respectively adding two parts of spent bleaching clay powder into a mixed solution of hexadecyl trimethyl siloxane, tetraethyl silicate, ammonia water and ethanol, and carrying out hydrophobic treatment to obtain a dispersion liquid; sequentially centrifuging, washing and drying the dispersion liquid to obtain modified oxidized and carbonized spent bleaching clay powder; sequentially carrying out washing, drying and plasma treatment on the two surfaces of the substrate; mixing the oxidized and carbonized waste white clay powder with resin and a curing agent respectively, then adding the mixture into a solvent for stirring treatment, and preparing a spraying coating through ultrasonic oscillation treatment; the spraying paint is sprayed on the two faces of a prepared substrate respectively, and the modified spent bleaching clay synthesized super-hydrophobic thermal management composite coating is obtained after curing. The composite coating prepared by the method can obviously reduce the energy consumption in the aspects of heating and cooling.

The present invention belongs to the technical field of new materials and the technical field of energy conservation and environmental protection. Disclosed are a carbon nanodot synthesized by using naturally withered leaves, and a preparation method therefor and an application thereof. In the method of the present invention, naturally withered leaves of camphor trees are used as a carbon source, and a carbon nanodot is obtained by means of drying, high-temperature calcination, ultrasonic oscillation, and centrifugal separation and purification. The method of the present invention is low-cost and environmentally friendly and involves a simple preparation process; and the prepared carbon nanodot can be used in the aspects of biological imaging, anti-counterfeiting, metal ion detection, etc., and has a good economic value and practicability.