54results about How to "Evenly doped" patented technology

The invention belongs to the field of new energy materials and devices, and particularly discloses nitrogen self-doped phenolic resin-based hard carbon microspheres and a preparation method and application thereof.The preparation method comprises the following steps that nitrogen-containing phenol monomers, aldehyde monomers and a basic catalyst are mixed according to a certain sequence, and after prepolymerization is conducted at the low temperature, the nitrogen self-doped phenolic resin-based hard carbon microspheres are obtained; carrying out high-temperature hydrothermal reaction to obtain phenolic resin microspheres; and sequentially carrying out low-temperature carbonization treatment and high-temperature carbonization treatment to obtain the nitrogen self-doped phenolic resin-based hard carbon microspheres. Compared with the existing nitrogen-doped resin hard carbon preparation method, the nitrogen-self-doped phenolic resin hard carbon has the advantages that a nitrogen source is introduced into the phenolic resin hard carbon from the source end of the resin, the production process is simplified, and uniform distribution and atomic-scale doping of the nitrogen element are realized. The material is used for sodium ion batteries, has excellent long cycle stability, good rate capability and high specific capacity, and has industrial application prospects.

The invention provides a preparation method of a high-rate and high-sphericity lithium iron phosphate positive electrode material, which comprises the following steps: weighing iron phosphate and a lithium source according to a certain proportion, dispersing in pure water, and mixing and sanding to obtain slurry A; under a stirring condition, adding a small amount of fluorine source into the slurry A to obtain lithium fluoride doped slurry B; and under the stirring condition, adding an organic carbon source into the slurry B to prepare an electrostatic spinning solution C, and drying and calcining at high temperature to obtain the high-rate and high-sphericity lithium iron phosphate composite positive electrode material. The preparation method comprises the following steps: synthesizing a lithium fluoride doped stock solution through an in-situ reaction of a fluorine source and a lithium source, and preparing a uniformly doped precursor through electrostatic spinning; the generated lithium fluoride is used as a fluxing agent to promote the formation of high-sphericity lithium iron phosphate in the sintering process; and meanwhile, the doping of fluorine ions weakens the interaction between Li and O, so that the lithium ions can be separated / embedded in a bulk phase during charging and discharging, and the conductive carbon layer is rich in lithium fluoride, so that the migration efficiency of the lithium ions at a positive electrode / electrolyte interface is improved.

The invention relates to the technical field of self-cleaning coatings, in particular to a two-component inorganic super-hydrophilic self-cleaning coating and a preparation method and application thereof.The preparation method comprises the following steps that 1, gamma-aminopropyltriethoxysilane is dissolved in an ethanol water solution, then titanium dioxide sol is added, stirring reaction is conducted for 2-4 h at the temperature of 40-50 DEG C, and modified titanium dioxide sol is obtained; (2) dispersing nano-montmorillonite in ethanol, then adding tea polyphenol, and performing ultrasonic dispersion for 0.5-1 hour to obtain a modified nano-montmorillonite suspension; (3) mixing a cerium nitrate solution with the alumina sol, then adding the modified montmorillonite suspension, and uniformly mixing to obtain composite alumina sol; and (4) mixing and cross-linking the prepared modified titanium dioxide sol and composite aluminum oxide sol to obtain the self-cleaning coating. The long-acting super-hydrophilic self-cleaning coating provided by the invention has the advantages of excellent self-cleaning capability, stable and long-acting super-hydrophilicity, wear resistance and antistatic effect.

The invention belongs to the technical field of heterojunction bipolar transistors, and particularly relates to a heterojunction bipolar transistor and an MOCVD epitaxial growth method thereof. The heterojunction bipolar transistor provided by the invention comprises a transition layer arranged between a base region and an emission layer, and the MOCVD epitaxial growth method comprises the step of growing the transition layer on the surface of the base region by adopting a linear variable-temperature staged pulse metal organic chemical vapor deposition method, pH3 is continuously introduced within the total growth time of the linear variable-temperature staged pulse metal organic chemical vapor deposition method, and trimethyl indium, trimethyl gallium and silane are introduced in a single-cycle staged pulse manner; and the temperature of the reaction chamber is linearly increased from the base region growth temperature to the emission layer growth temperature within the time from the T1 initial moment to the TN initial moment. The heterojunction bipolar transistor obtained by the method provided by the invention is large in gain, low in sheet resistance and good in reliability.

The invention provides a doped ultra-high nickel precursor with a radial structure, preparation, a positive electrode material and application, the doped ultra-high nickel precursor is spherical, and the internal structure of the doped ultra-high nickel precursor is as follows: crystal grains are radially arranged and distributed from the core position of the sphere to the surface of the sphere; the chemical general formula of the doped ultrahigh nickel precursor is (Ni < x > Co < y > Mn < 1-x-y >) < 1-z > M < z > (OH) < 2 + delta >, x is more than or equal to 0.88 and less than or equal to 0.98, y is more than or equal to 0 and less than or equal to 0.10, 0 lt; z < = 0.10; m is a doping element, and delta is dynamically adjusted according to the valence state and the content of M. The doping elements in the doped ultrahigh nickel precursor provided by the invention are relatively uniform in doping and crack-free, and the interiors of the doped ultrahigh nickel precursor are radially arranged, so that the electrochemical performance of a lithium ion battery containing a positive electrode material prepared from the doped ultrahigh nickel precursor is remarkably improved.

The invention relates to the technical field of batteries, in particular to a method for preparing a multi-element uniformly-doped sodium ferric sulfate porous sodium battery positive electrode material by a mixed alcohol precipitation method, which is characterized by comprising the following steps of: weighing element sulfate to be doped and ferrous sulfate heptahydrate according to a molar ratio of (0.1-15%): 1; the method comprises the following steps: preparing a mixed alcohol solution containing a carbon source, weighing anhydrous sodium sulfate with a corresponding molar weight, dissolving the anhydrous sodium sulfate in deionized water to form a uniform mixed solution, adding the mixed solution into the mixed alcohol solution containing the carbon source, carrying out a stirring reaction at room temperature for a certain period of time (1 min to 4 h), separating slurry to obtain powder, and collecting and storing a filtrate for subsequent recycling. And sintering the powder to prepare the multi-element uniformly-doped sodium ferric sulfate type material. The method disclosed by the invention can effectively solve the problems of difficult uniform mixing of raw materials, impure product, many defects, non-uniform distribution of doped elements, and difficult regulation and control of secondary particle and pore distribution of the product in the traditional synthesis and modification process, and ultimately improves the electrochemical performance of the doped sodium ferric sulfate positive electrode material.

The invention discloses a preparation method and application of a lattice-gap mixed RuO2 solid solution acidic oxygen evolution electrocatalyst. According to the RuO2 electrocatalyst and the preparation method thereof, high-valence metal is introduced into RuO2 unit cells at the same time to serve as a lattice substitution doping component, nonmetal serves as an interstitial doping component, and a lattice-interstitial mixed RuO2 solid solution structure is constructed, so that the activity and stability of the RuO2 electrocatalyst are remarkably improved. The preparation method comprises the following steps: dissolving soluble ruthenium salt, high-valence metal salt, non-metal salt and a molten salt medium in deionized water, and stirring to form a solution; the solution is freeze-dried to prepare a precursor, and then the precursor is subjected to heat treatment to obtain the lattice-gap mixed RuO2 solid solution acidic oxygen evolution electrocatalyst. According to the lattice-gap mixed RuO2 solid solution acidic oxygen evolution electrocatalyst prepared by the invention, the overpotential required by a catalytic oxygen evolution reaction under the current density of 10mA cm <-2 > can be as low as 168mV, and the electrocatalyst can continuously and stably work for more than 500h in an acidic environment, so that the application requirements of the acidic oxygen evolution electrocatalyst can be greatly met.

The invention discloses a preparation process of a poly laminated double-passivation structure of a TOPCon battery and the TOPCon battery, and belongs to the technical field of solar cells, the preparation process of the poly laminated double-passivation structure of the TOPCon battery comprises the following steps: S1, a pretreatment process; s2, preparation of a laminated double-passivation structure: feeding the silicon wafer subjected to the pretreatment process into a furnace tube of a PECVD (Plasma Enhanced Chemical Vapor Deposition) machine, preparing a tunneling oxide layer on the back of the silicon wafer, and preparing the laminated double-passivation structure on the tunneling oxide layer, the laminated double-passivation structure sequentially comprising a buffer layer, a barrier layer and an N-type amorphous silicon layer; the buffer layer is an intrinsic amorphous silicon layer, and the barrier layer is a tunneling oxidation barrier layer. According to the poly laminated double-passivation structure, the controllability of phosphorus doping distribution can be improved, the doping uniformity is further improved, the contact performance can be improved through high phosphorus doping concentration, meanwhile, the N / N high-low junction phenomenon caused by too high phosphorus doping concentration is avoided, the passivation contact performance of a battery piece is improved, and high battery conversion efficiency is obtained.

The invention discloses a preparation method of an aerogel composite material uniformly doped with an opacifying agent, and belongs to the technical field of aerogel composite materials. Comprising the following steps: mixing a precursor solution with ethanol in a ratio of 1: (0.5-20), and stirring for 20 minutes to obtain a shading modified solution; a base material is put into the shading modification liquid, at the moment, the base material is completely soaked in the shading modification liquid, the base material is taken out after being soaked for 2 min, sent into a steam box to be soaked and then taken out to be dried, a dried base material is obtained, and the dried base material is subjected to heat treatment to obtain a shading base material; the preparation method comprises the following steps: preparing silica sol from ethyl silicate, ethanol, deionized water, ammonium fluoride and ammonia water in a mass ratio of 1: (1.5-15): (0-0.3): (0.01-0.05): (0.01-0.05); a shading base material is completely soaked in silica sol, and the aerogel composite material is obtained through gelation, aging, hydrophobic modification and supercritical drying. The prepared aerogel composite material uniformly doped with the opacifying agent can provide excellent heat insulation performance in a high-temperature environment.

The invention discloses an aluminum-magnesium co-doped cobalt carbonate precursor as well as a preparation method and application thereof. The preparation method comprises the following steps: respectively preparing a cobalt-aluminum mixed solution and a magnesium-containing precipitant solution; and adding the cobalt-aluminum mixed salt solution and the magnesium-containing precipitant solution into a base solution, and carrying out a co-precipitation reaction to obtain the aluminum-magnesium co-doped cobalt carbonate precursor. According to the method disclosed by the invention, the magnesium element is introduced into the precipitant solution in advance, so that magnesium ions can be complexed with the precipitant in advance, and the problems of nonuniform doping and segregation caused by difficult control of the precipitation rate of magnesium in the doping process are solved. According to the aluminum-magnesium co-doped cobalt carbonate precursor prepared by the method, magnesium and aluminum are uniformly doped, and the cycling stability of a lithium cobalt oxide battery can be effectively improved.

This invention discloses a zirconium-lanthanum bulk co-doped high-nickel ternary material, its preparation method, and a battery. The zirconium-lanthanum bulk co-doped high-nickel ternary material is a ternary cathode material with bulk co-doped zirconium and lanthanum; the chemical formula of the ternary cathode material is LiNi. x Co y Mn (1‑x‑y) O2, wherein 0.8≤x≤0.9, 0≤y≤0.1; the total molar amount of zirconium and lanthanum is 1%~5% of the total molar amount of nickel, cobalt and manganese. The zirconium-lanthanum bulk co-doped high-nickel ternary material provided by the present invention enhances the mechanical strength of the ternary material through the bulk co-doping of zirconium and lanthanum, suppresses cracking and pulverization of the ternary material during charge and discharge, and improves cycle stability; at the same time, the two elements Zr and La synergistically stabilize the lattice, reduce lithium-nickel mixing, suppress irreversible phase transformation and lattice oxygen precipitation, achieve dual stability of bulk phase and interface, and improve the consistency and stability of the zirconium-lanthanum bulk co-doped high-nickel ternary material.

The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a boron-doped porous silicon material, the porous silicon material and application. The preparation method of the boron-doped porous silicon material comprises the following steps: mixing Mg powder, Si powder and B2O3 serving as raw materials, and carrying out alloying reaction on the mixed raw materials in a protective atmosphere to prepare B-doped Mg2Si; the B-doped Mg2Si and nitrogen are subjected to a dealloying reaction, and an Mg3N2 / B-Si compound is prepared; and carrying out acid pickling on the Mg3N2 / B-Si compound to obtain the boron-doped porous silicon material. The boron element is introduced in situ while the micron porous silicon is synthesized, bulk phase uniform doping of B to Si is achieved, the used raw materials are low in cost and easy to obtain, the preparation process is simple and easy to implement, and the method has the industrial large-scale production potential.

The application discloses a preparation method of nitrogen-doped carbon-silicon nanofibers and application of the nitrogen-doped carbon-silicon nanofibers in a lithium ion battery negative electrode material, and belongs to the technical field of lithium ion battery negative electrode materials. The method comprises the following steps: mixing silicon nanoparticles and a carbon source, performing electrostatic spinning, stabilization treatment and carbonization treatment, and obtaining carbon-silicon nanofibers; and then mixing the carbon-silicon nanofibers with a nitrogen source, performing heat treatment under an inert atmosphere, making nitrogen elements doped into a carbon skeleton, and obtaining nitrogen-doped carbon-silicon nanofibers. The material obtained by the application is a one-dimensional nanofiber structure, silicon particles are uniformly wrapped in carbon fibers, and nitrogen elements are uniformly distributed in the carbon skeleton. The method can realize uniform nitrogen doping while maintaining the microstructure of the material, and significantly improves the electronic conductivity and interface stability of the material. The material obtained by the application is used as a lithium ion battery negative electrode, and exhibits high reversible capacity and excellent cycle stability.

This invention relates to a tungsten-doped tin dioxide nanopowder, its preparation method, and its application in semiconductor-type gas-sensitive elements. The method for preparing the tungsten-doped tin dioxide nanopowder includes the following steps: dissolving a soluble tungsten compound and a soluble tin compound in an aqueous solution containing a surfactant, and adding a complexing agent to obtain a homogeneous metal ion mixed solution; adding a precipitant to the mixed solution under stirring conditions to adjust the pH to 2-6, causing a metal hydroxide precursor to precipitate; aging, solid-liquid separation, washing, and drying the precipitate to obtain a precursor powder; adding a dispersant to the precursor powder and mixing evenly; and calcining to obtain the tungsten-doped tin dioxide nanopowder. The tungsten-doped tin dioxide nanopowder of this invention can be used in the preparation of semiconductor-type gas-sensitive sensors, ultraviolet detectors, lithium-ion battery anode materials, catalysts, or transparent conductive films.

The application belongs to the technical field of all-solid-state lithium-sulfur battery materials, and relates to a lithium sulfide nano composite positive electrode material with high reaction kinetics and a preparation method and application thereof. The application aims to solve the deficiencies of the lithium sulfide positive electrode material in ion and electron conductivity, reduce the activation barrier of the lithium sulfide positive electrode material, improve the battery redox kinetics, and further improve the rate performance and cycle capacity of the battery. The lithium sulfide nano composite positive electrode material is prepared by using an in-situ synthesis method, the obtained composite material has rich metal atom crystals embedded in the lithium sulfide matrix, and a layer of amorphous carbon is uniformly coated on the surface. The finally obtained lithium sulfide nano composite positive electrode material exhibits high reversible capacity and excellent rate performance. The application has the characteristics of uniform coating and simple process, is suitable for large-scale production, and has a wide application prospect in the field of all-solid-state lithium-sulfur batteries.

The utility model relates to the technical field of gallium oxide crystal growth, and discloses a crucible structure for growing a gallium oxide single crystal by a VB method, which comprises a crucible shell, a seed crystal cavity, a diameter-expanding cavity, a diameter-reducing cavity, a shoulder-expanding cavity and an equal-diameter cavity, the seed crystal cavity, the diameter-expanding cavity, the diameter-reducing cavity, the shoulder-expanding cavity and the equal-diameter cavity are arranged in the crucible shell, the seed crystal cavity is arranged at one end of the crucible shell, and the diameter-reducing cavity is arranged at the other end of the crucible shell. One end of the seed crystal cavity is closed, the other end of the seed crystal cavity is connected with the diameter-expanding cavity, the diameter-expanding cavity is connected with the diameter-reducing cavity, the diameter-reducing cavity is connected with the shoulder-expanding cavity, the shoulder-expanding cavity is connected with the equal-diameter cavity, and the other end of the equal-diameter cavity is open. Through reasonable design of a gallium oxide growth technology, the crucible shell, the seed crystal cavity, the diameter-expanding cavity, the diameter-reducing cavity, the shoulder-expanding cavity and the equal-diameter cavity are adopted, so that gallium oxide crystals can be separated from the crucible wall during growth and cooling, dislocation proliferation and twin crystal structures are not easy to appear, the crystal dislocation density is reduced, and the performance of a semiconductor chip is improved. The crucible structure can be used for preparing cylindrical gallium oxide single crystals with low dislocation density.

The application relates to a highly-ordered porous sulfur / oxygen co-doped carbon sphere and a preparation method and a potassium ion battery thereof, and belongs to the technical field of battery materials. The application discloses a preparation method of a highly-ordered porous sulfur / oxygen co-doped carbon sphere. The carbon sphere is prepared by mixing sulfur powder and resin material, the prepared carbon sphere is uniformly doped with atoms, the pore size distribution is uniform, the number of potassium storage sites is relatively large, and the carbon sphere can be applied to a potassium ion battery. The application further discloses a potassium ion battery. The active material of the potassium ion battery comprises the highly-ordered porous sulfur / oxygen co-doped carbon sphere. The potassium ion battery can be a half battery assembled by a negative electrode material containing the highly-ordered porous sulfur / oxygen co-doped carbon sphere and metal potassium. The potassium ion battery can also be a full battery assembled by the negative electrode material containing the highly-ordered porous sulfur / oxygen co-doped carbon sphere and a prussian blue positive electrode material.

The invention relates to the technical field of nano materials, in particular to a preparation method of a Zn-based bimetal MOFs material and application of the Zn-based bimetal MOFs material as a medical drug carrying material. The preparation method comprises the following steps: preparing Zn, Mn and a ligand according to a molar ratio of 1: 1: (72-80), and mainly comprises the steps of preparation of metal salt solutions, coordination polymerization reaction, separation and purification, and drying. The process for preparing the Zn-based bimetallic MOFs material is simple and environmentally friendly, the obtained product has the excellent performance of being small in particle size, regular and stable, and the material loaded with doxorubicin hydrochloride has high loading rate and has potential clinical conversion value.

A preparation method of high-compaction titanium-doped iron phosphate, comprising S1, preparing a phosphoric acid solution, a hydrogen peroxide solution, a Ti salt solution, a phosphorus salt solution and a ferrous salt solution; S2, mixing the Ti salt solution and the ferrous salt solution to obtain a titanium-iron salt solution; mixing the phosphoric acid solution and the phosphorus salt solution to obtain a phosphorus source solution; S3, adding the titanium-iron salt solution into a reaction kettle and adding the hydrogen peroxide solution; S4, adding the phosphorus salt solution into the reaction kettle to obtain a yellow slurry; S5, after the slurry color changes to white after temperature rising, a white slurry is obtained; S6, performing solid-liquid separation on the white slurry to obtain an iron phosphate dihydrate filter cake; S7, drying and calcining the iron phosphate dihydrate filter cake to obtain a battery-grade anhydrous iron phosphate doped with Ti. The present application prepares titanium-doped iron phosphate in one step, controls the molar ratio of iron elements to total phosphorus, phosphorus ammonium and phosphoric acid in the reaction system, controls the pH of the reaction system, ensures the retention of Ti elements in the finished product and regulates the iron-phosphorus ratio within a specified range.

The embodiment of the invention relates to a high-entropy sulfide material for a lithium ion battery negative electrode and a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The embodiment of the invention aims to solve the technical problems of poor ionic conductivity, low reversible capacity and poor cycling stability of a lithium ion battery material. The preparation method of the high-entropy sulfide material for the negative electrode of the lithium ion battery in the embodiment of the invention specifically comprises the following steps: step 1, dissolving metal salt and potassium citrate dehydrate in deionized water to obtain a solution A; dissolving potassium ferricyanide in deionized water to obtain a solution B; 2, mixing the solution A and the solution B, stirring, and drying in a drying oven to obtain a precursor C; and step 3, adding powdered sulfur into the precursor C, mixing, calcining, centrifugally washing with absolute ethyl alcohol for three times, and drying, thereby obtaining the product. According to the high-entropy sulfide material provided by the invention, the specific capacity and coulombic efficiency of a lithium ion battery are remarkably improved, and the high-entropy sulfide material has relatively good rate capability and cycling stability.

The invention relates to the technical field of lithium ion batteries, and discloses a high-nickel ternary positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing and sintering a nickel-cobalt-manganese precursor, a lithium source, niobium salt and fused salt. According to the preparation method of the high-nickel ternary positive electrode material provided by the invention, the niobium salt and the molten salt form a liquid phase environment at a relatively low temperature, and the niobium element can efficiently enter a crystal lattice, so that uniform bulk phase doping in a real sense is realized, and the electrochemical stability and the thermal stability are improved; meanwhile, the niobium doping can ensure the rapid and uniform transmission of the lithium source, so that the lithiation is more sufficient, and the lithium-nickel mixed arrangement caused by lithium deficiency is reduced in dynamics.

The invention provides a high-nickel-doped precursor, a preparation method thereof, a positive electrode material and application, and the preparation method comprises the following steps: mixing a precipitant solution, a complexing agent solution, a dopant solution, a metal mixed salt solution and a reaction base solution, and carrying out a co-precipitation reaction to obtain the high-nickel-doped precursor; the dopant solution comprises a single metal modified lignosulfonate. In the preparation method provided by the invention, the dopant solution and the precipitant solution are subjected to chemical reaction, and the generated sodium lignin sulfonate is used as an anionic surfactant, so that the dispersity of precipitate particles in the coprecipitation process is effectively improved, the agglomeration phenomenon of the precipitate particles is reduced, and the lattice constant of the high-nickel precursor is expanded; therefore, the charge-discharge performance of the ion battery is improved; besides, monometal modified lignosulfonate in the dopant solution is used as a dopant, and hydroxide precipitation can be slowly generated in the coprecipitation reaction process, so that uniform doping of a metal ion phase of the high-nickel precursor is realized.

The utility model relates to the technical field of semiconductor material preparation, and disclose a kind of N type high-purity silicon target material red phosphorus doping device, including reaction chamber, rotating support mechanism, phosphorus vapor injection system, partition temperature control module, gas circulation unit and intelligent control system, reaction chamber adopts quartz material double-layer structure, the inner wall of reaction chamber is provided with silicon nitride coating, the outer wall of reaction chamber is provided with vacuum pump set, rotating support mechanism includes high-temperature ceramic support, magnetic fluid seal shaft and brushless motor, high-temperature ceramic support is connected with the output end of brushless motor by magnetic fluid seal shaft, by integrated reaction chamber, rotating support mechanism, phosphorus vapor injection system, partition temperature control module, gas circulation unit and intelligent control system, by rotating dynamic doping, intelligent temperature control and waste gas circulation technology, significantly improve the uniformity of doping and raw material utilization rate, realize the efficient, uniform doping of silicon target material.

This invention discloses a Ni-Sn / NC(P) electrocatalyst, its preparation method, and its application, relating to the field of electrochemical CO2 reduction raw material technology. In this invention, zinc nitrate hexahydrate, 2-methylimidazolium, and polyvinylpyrrolidone are separately placed in methanol and stirred. After stirring, they are mixed and stirred again, centrifuged, washed, and vacuum dried. Nickel chloride hexahydrate, tin tetrachloride pentahydrate, ethanol, and the obtained ZIF-8@PVP precursor are mixed, heated and stirred in a water bath, centrifuged, washed, and vacuum dried. The obtained Ni-Sn / ZIF-8(PVP) powder is calcined in an inert atmosphere, and after calcination, cooled to room temperature to obtain the Ni-Sn / NC(P) electrocatalyst. This invention provides a diatomic electrocatalyst with regular morphology, uniform elemental distribution, and excellent electrochemical performance for the efficient electroreduction of carbon dioxide to carbon monoxide. Its preparation method is controllable, uses simple equipment, has high conversion efficiency, and is low in cost.

This invention belongs to the field of highway application technology, and particularly relates to a tunnel asphalt mixture mixing device. It includes a frame and a mixing drum mounted on the frame. The mixing drum has an opening at the top and a discharge port at the bottom, with a sealing plate at the discharge port. The sealing plate is flipped up and positioned at the bottom of the mixing drum. A rotating shaft is installed inside the mixing drum, extending through one side and beyond the drum. A drive motor is connected to the end of the rotating shaft extending beyond the drum, and a stirring rod is mounted on the rotating shaft. This invention improves upon the structure of existing mixing devices by utilizing a dual-shaft structure to change the rotation state of the asphalt mixture within the mixing drum, combined with the uniform distribution of flame retardant via a flame retardant spreader. This allows the flame retardant to be quickly and evenly incorporated into the asphalt mixture, enabling its application on construction sites, reducing transportation costs, and thus minimizing segregation, thereby facilitating paving.

The invention belongs to the technical field of nano material preparation. The invention provides a doped silicon nanowire as well as a preparation device, a preparation method and application thereof, an aluminum chloride generation chamber is arranged in a main reaction chamber of the preparation device and is communicated with a silicon source inlet, a catalytic source inlet and a doping source inlet, and aluminum chloride, the silicon source, the catalytic source and the doping source are mixed in an inner cavity of the main reaction chamber by utilizing the preparation device to prepare the doped silicon nanowire. The method comprises the following steps: adding a silicon source into a catalytic source, carrying out a reaction, reducing the silicon source and the catalytic source into monatomic silicon and a metal catalyst by aluminum monochloride in the reaction process, catalyzing the monatomic silicon by the metal catalyst to generate a silicon nanowire, and carrying out in-situ doping on the silicon nanowire by a doping source to obtain a doped silicon nanowire; the scheme is simple and convenient, doped silicon nanowires can be generated on a large scale, the doping type and the doping effect are controllable, and the improvement effect of doping on the performance of the silicon nanowires is ensured.

The application discloses a preparation method of manganese iron phosphate and application thereof, and the preparation method comprises the following steps: S1, mixing an iron-manganese-phosphorus mixed solution, an oxidizing agent and a pH regulator to obtain a mixed slurry; S2, taking 20%-60% of the volume of the mixed slurry at 60-100 DEG C for 2-6 hours, then adding the remaining mixed slurry for heat preservation reaction, impurity removal and calcination to obtain manganese iron phosphate. The monohydrate manganese iron phosphate prepared by the embodiment of the application has olivine-shaped primary particles, the olivine-shaped primary particles are orderly stacked to form secondary particles, the process is simple and stable, and iron and manganese elements are uniformly doped.

The invention belongs to the technical field of optical communication, and particularly discloses a preparation method of an ultra-low attenuation optical fiber and the ultra-low attenuation optical fiber, and the preparation method comprises the steps: S1, preparing a fluorine-doped sleeve with non-uniform fluorine distribution through employing an external vapor deposition technology; s2, stretching and corroding the fluorine-doped sleeve to obtain an inner cladding with a predetermined aperture; s3, SiO2 is deposited in the inner cladding layer by using an in-tube vapor deposition process, alkali metal doping is performed to form a core layer, the inner cladding layer with the core layer is melted and shrunk into a rod shape, and a rod-shaped structure is obtained; s4, preparing an outer cladding layer outside the rod-shaped structure through an external vapor deposition process, drying the rod-shaped structure with the outer cladding layer, and solidifying in a fluorine-containing atmosphere to obtain an optical fiber preform; and S5, drawing the optical fiber preform to form the optical fiber. According to the preparation method, external chemical vapor deposition and in-tube vapor deposition are utilized to achieve better optical fiber profile matching and viscosity matching.

The invention belongs to the technical field of photocatalysts and preparation thereof, and particularly relates to a Zn-Zr / ZSM-5 / SrO photocatalyst and a preparation method and application thereof. The preparation method of the Zn-Zr / ZSM-5 / SrO photocatalyst comprises the following steps: dissolving Zn (NO3) 2.6 H2O and ZrO (NO3) 2.2 H2O in absolute ethyl alcohol, then adding ZSM-5, grinding and calcining the obtained white solid, dissolving the obtained Zn and Zr doped ZSM-5 in absolute ethyl alcohol, adding Sr (NO3) 22H2O, and calcining the obtained solid to obtain the photocatalyst. The Zn-Zr / ZSM-5 / SrO photocatalyst provided by the invention has the advantages of strong photocatalytic degradation capability and stable structure. The preparation method is simple and convenient to operate. The invention further provides application of the Zn-Zr / ZSM-5 / SrO photocatalyst, and the degradation rate is high.

This invention relates to a doped yttrium oxide flake powder, its preparation method, and its applications. The method uses 0.2-0.4 M Y(NO₃)₂. 3 ) 3 ·6H 2 O solution as Y 3+ Source, then add MgCl to the solution 2 and Al(NO 3 ) 3 ·9H 2 O was used as a dopant. After adjusting the pH of the mixed solution to 8-10, a hydrothermal reaction was carried out at 170-200°C for 9-15 hours to achieve uniform distribution of the dopant in the yttrium oxide lattice. Finally, the powder was calcined at 600-700°C for 3-5 hours to improve the structural stability and properties of the material. The synthesized doped yttrium oxide powder had a plate-like morphology with a particle size between 5-25 micrometers, and the final product composition included Y. 2 O 3 MgAl 2 O 4 And Y-Al-O compounds. Compared with traditional physical doping methods, the preparation method of this invention not only achieves a more uniform doping effect, but also shows significant advantages in terms of energy consumption, cost, and particle size control. The doped yttrium oxide obtained by this method has performance superior to or equivalent to high-purity yttrium oxide, providing a new avenue for the further application and development of yttrium oxide.