107results about How to "Simple preparation steps" patented technology

The invention relates to the technical field of marine chemical engineering, in particular to thiolated chitosan quaternary ammonium salt containing thiophene groups as well as a preparation method and application of the thiolated chitosan quaternary ammonium salt. The thiolated chitosan quaternary ammonium salt containing the thiophene group has a structure as shown in a formula I in the specification. The preparation method comprises the following steps: further reacting sulfhydrylated chitosan to obtain sulfhydrylated chitosan quaternary ammonium salt, and further introducing thiophene groups into the chitosan quaternary ammonium salt by taking the sulfhydrylated chitosan quaternary ammonium salt as a reaction raw material. Antioxidant activity experiments prove that the obtained thiolated chitosan quaternary ammonium salt derivative has good antioxidant activity, and can be widely researched and applied as an antioxidant in the fields of biological medicine, agriculture and the like. And the # imgabs0 # is shown in the formula 1.

The invention provides a Fenton technology coupled microbial fuel cell, a preparation method and application, and relates to the field of environment, materials and energy, the specific technical scheme is as follows: the Fenton technology coupled microbial fuel cell comprises an anode, a cathode and a catholyte, and is characterized in that the anode is a biological anode, the cathode is an air cathode, and the air cathode is an air cathode; the air cathode comprises an oxygen reduction electrocatalyst and a cathode substrate I, the oxygen reduction electrocatalyst is attached to the cathode substrate I, and the catholyte is common industrial and domestic wastewater. The electro-Fenton technology is introduced into the air cathode of the microbial fuel cell, the cathode fully utilizes electrons generated by metabolism of a biological anode to carry out an oxygen reduction process in the presence of air, so that hydrogen peroxide is generated in situ and is activated into active species such as hydroxyl free radicals through a Fenton catalyst, and the hydrogen peroxide is converted into hydrogen peroxide. Therefore, the purpose of degrading complex pollutants with low energy consumption is achieved.

The invention discloses a dextran-based HRP-goat anti-mouse IgG labeled antibody and a preparation method thereof, and the preparation method is characterized by comprising the following steps: S1, oxidizing dextran to obtain aldehyde group-containing dextran; s2, carrying out polymerization on the dextran containing the aldehyde group and horse radish peroxidase, so as to obtain a horse radish peroxidase polymer; s3, performing desalination and ultrafiltration on the horse radish peroxidase polymer to obtain an ultrafiltration product I; s4, connecting a goat anti-mouse IgG antibody to the ultrafiltration product I to obtain oxidized glucan coupled with goat anti-mouse IgG and HRP enzyme; and S5, purifying the oxidized dextran of the product coupled with the goat anti-mouse IgG and the HRP enzyme, so as to obtain the dextran coupled HRP-goat anti-mouse IgG labeled antibody. The dextran product obtained by the invention is wide in molecular weight coverage, different molecular weights can be selected to design polymer substances with different sizes, the number of aldehyde groups can be controlled to control coupling of different numbers of protein molecules under the same molecular weight, and the signal intensity is easy to control.

The invention relates to a UV viscosity-reducing adhesive, a UV viscosity-reducing adhesive composition, an adhesive tape and a preparation method. The UV viscosity-reducing adhesive comprises an acrylate copolymer, wherein the acrylate copolymer comprises a main chain and a multifunctional acrylate side group grafted on the main chain; the main chain is formed by copolymerizing a plurality of polymeric monomers including an acrylate soft monomer, an acrylate hard monomer and a functional acrylate monomer; the acrylate soft monomer is acrylate long-chain alkyl ester, and the carbon atom number of the long-chain alkyl ester is greater than or equal to 4; the acrylate hard monomer is methyl (methyl) acrylate; the functional acrylate monomer is acrylic acid (ester) containing carboxyl and acrylic ester containing hydroxyl; the polyfunctional group acrylate side group is formed by a UV active substance, each molecule of which contains a plurality of acrylate groups and contains one epoxy group, through a reaction between the epoxy group and the carboxyl group on the main chain. The UV viscosity-reducing adhesive has a UV viscosity-reducing function, does not need to additionally add UV active monomers or low polymers, can enhance the UV light viscosity-reducing effect and improve the viscosity-reducing efficiency, and is also beneficial to reducing the ingredient composition of a UV adhesive material and simplifying the preparation method.

The invention relates to the technical field of building materials, and provides a high-durability modified cement-based composite material and a preparation method thereof.The high-durability modified cement-based composite material comprises a carbon dot polymer, mixing water and Portland cement, and the specific preparation steps are as follows: adding citric acid and urea into water to be dissolved, and then putting into a high-pressure reaction kettle to be heated to obtain an initial product; adding the initial product into water, and carrying out centrifugation, filtration, rotary evaporation and drying to obtain the carbon dots; the preparation method comprises the following steps: dissolving carbon dots in water, preparing an initial carbon dot polymer product by adopting a hydrothermal method or a microwave method, adding the initial carbon dot polymer product into water, centrifuging, filtering, rotationally evaporating and drying to obtain a carbon dot polymer; and mixing the carbon dot polymer with mixing water and Portland cement to obtain the high-durability modified cement-based composite material. The modified cement-based composite material prepared by the invention is simple to prepare, low in cost, green and low-carbon; the rust can be efficiently inhibited, and concrete reinforcements are effectively protected from being corroded; the method can be widely applied to reinforced concrete and has wide application prospects.

The embodiment of the invention provides a preparation method of a photoelectric biosensor and the photoelectric biosensor, and relates to the technical field of photoelectric sensing, and the preparation method comprises the following steps: preparing a biomass derived hierarchical porous carbon PBAC material, preparing PBAC interface blending adsorption layer carbon slurry according to the biomass derived hierarchical porous carbon PBAC material, and preparing working electrode slurry; performing chemical etching on ITO conductive glass to prepare an electrode substrate, printing the working electrode slurry on the electrode substrate by using a screen printing technology, and printing PBAC interface blending adsorption layer carbon slurry on the electrode substrate to obtain a working electrode; a colloidal gold solution is dropwise added to the working electrode, after drying, a probe solution is dropwise added to the surface of the working electrode again, incubation is conducted in a constant-temperature box, and the photoelectrochemical biosensor is obtained after the reaction is completed. According to the invention, the biocompatibility of the photoelectric biosensor is enhanced, and the stability and sensitivity of the sensor are improved.

The invention relates to the technical field of polypeptide preparation, in particular to cyclic hexapeptide as well as a preparation method and application thereof. The preparation method comprises the following steps: reacting fluorenylmethoxycarbonyl-N6-trimethylsilylethoxycarbonyl acyl-L-lysine with 2-chlorotrityl chloride, and removing the protection of trimethylsilylethoxycarbonyl, so that amino is connected to dichloro resin; the preparation method comprises the following steps: taking fluorenylmethoxycarbonyl-O-tert-butyl-L-threonine, fluorenylmethoxycarbonyl-L-proline, fluorenylmethoxycarbonyl-L-alanine, fluorenylmethoxycarbonyl-aspartic acid-4-tert-butyl ester and fluorenylmethoxycarbonyl-L-leucine as a starting point, and then removing amino protection of terminal amino acid and carboxyl protection of the first amino acid; and carrying out condensation reaction and peptide cutting reaction to obtain the cyclic hexapeptide. The preparation method disclosed by the invention is simple in steps and simple and convenient to operate, the use of tetraphenylphosphine palladium is avoided, and the defects of low efficiency, high cost and low yield of the traditional liquid-phase cyclization method and solid-phase cyclization method are overcome.

The invention relates to the field of cosmetics, in particular to skin moistening oil containing a water-soluble active matter and a preparation method of the skin moistening oil. The skin moistening oil of the water-soluble active matter is prepared from the following raw materials in parts by mass: 0.1-1 part of a phase A, 3-15 parts of a phase B and 80-100 parts of a phase C, wherein the phase A is a water-soluble component, and the water-soluble component comprises one or more of deionized water, VC ethyl ether and nicotinamide; the phase B is a solvent, and the solvent comprises one or more of ethyoxyl diethylene glycol, 1, 2-pentanediol, isopentanediol and isostearic acid; the phase C is skin moistening oil, and the skin moistening oil comprises caprylic / capric triglyceride. The skin moistening oil product provided by the invention has the advantages of clear and transparent appearance, good fluidity, excellent stability, no need of adding a surfactant or a solubilizer, mildness, no irritation, simple process, controllable cost, good practical value and good application prospect.

The invention discloses a high-entropy sodium vanadium phosphate positive electrode material and a preparation method and application thereof.The material comprises a carbon layer coated on the outer layer of sodium vanadium phosphate, the chemical formula of the sodium vanadium phosphate is Na3V2-10xMn3xCo3xNi3xCr2xTi3x / 2 (PO4) 3, x is larger than or equal to 0 and smaller than or equal to 0.1, a carbon source, a vanadium source, a phosphorus source, a manganese source, a cobalt source, a nickel source, a chromium source, a titanium source and a sodium source are sequentially added into a solvent according to needs to be evenly mixed, the mixture is heated and stirred in an oil bath till the gel state is achieved, drying is conducted, and the high-entropy sodium vanadium phosphate positive electrode material is obtained. And grinding, calcining, naturally cooling to room temperature, and grinding into powder. The five elements Mn, Co, Ni, Cr and Ti are used for partially replacing V, the diffusion kinetics and conductivity of sodium ions are improved by doping and optimizing the structure of the material, the crystallinity and specific capacity of the material are improved, rapid migration of the sodium ions and conduction of electrons are promoted, the electrochemical performance is excellent, and the material is used for the sodium ion battery.

The invention provides a lithium-aluminum alloy negative electrode and a preparation method and application thereof, and the preparation method comprises the following steps: in a protective gas, an aluminum foil, a lithium sheet, a diaphragm and an electrolyte are adopted to prepare a battery cell, the aluminum foil is a positive electrode, and the lithium sheet is a negative electrode; the method comprises the following steps: preparing an aluminum foil on the surface of a battery cell, then discharging the battery cell with the discharging voltage range of 0.03-0.4 V to generate a beta-LiAl alloy layer on the surface of at least one side of the aluminum foil, disassembling the battery cell after discharging is finished, and taking the disassembled aluminum foil loaded with the beta-LiAl alloy layer on the surface as the lithium-aluminum alloy negative electrode. According to the preparation method disclosed by the invention, the lithium-aluminum alloy with a fixed crystal form is formed on the surface of the aluminum foil in advance, and the conversion of the beta-LiAl alloy between a lithium-rich state and a lithium-poor state is realized by regulating and controlling the voltage range in the charging and discharging process, and the conversion between phases is not involved, so that the cycling stability of the battery is improved, and the service life of the battery is prolonged. The problem that the volume change of the lithium-aluminum alloy in the charging and discharging process is large is solved.

The invention discloses an iron-based metal nano diagnosis and treatment agent as well as a preparation method and application thereof. The iron-based metal nano diagnosis and treatment agent comprises an iron-based metal nano material and a diagnosis and treatment agent loaded with therapeutic nuclide 177Lu and / or a micromolecular chemotherapeutic drug F16. The iron-based metal nano diagnosis and treatment agent contains an iron element, can be used for MRI imaging and can induce tumor ferroptosis at the same time, radionuclide 177Lu can emit gamma rays for SPECT imaging and can emit beta rays for tumor internal radiotherapy, tumor mitochondria targeting small molecule medicine F16 has the fluorescence characteristic and can be used for tumor real-time fluorescence imaging, and the application range is wide. Meanwhile, a mitochondrial targeting tumor killing effect is achieved. Therefore, the iron-based metal nano diagnosis and treatment agent disclosed by the invention can realize comprehensive collaborative treatment of intratumor radiotherapy, targeted chemotherapy and ferroptosis under the guidance of MRI (Magnetic Resonance Imaging), SPECT (Single Photon Emission Computed Tomography) and multi-mode imaging of fluorescence imaging, and improves the precise diagnosis and treatment of tumors.

The invention provides a UV-cured color-tunable dual-emission room-temperature phosphorescent material as well as a preparation method and application thereof, and belongs to the technical field of color-tunable room-temperature phosphorescent functional materials. According to the invention, nitrogen-doped or nitrogen-metal ion-doped carbon quantum dots are used as a main ultraviolet light response phosphorescence color development center, a polyacrylamide and cellulose-based derivative double network is used as a substrate and a secondary phosphorescence color development center, acrylamide double bonds are broken into polyacrylamide through ultraviolet light, and further dehydration is carried out; the prepared room-temperature phosphorescent material shows different visible light colors under the excitation of ultraviolet light with two wavelengths, is tunable in color, can be applied to the fields of anti-forgery ink, optical information coding, photoelectric devices, advanced information encryption, humidity sensing detection and the like, and has wide application prospects. Wide popularization and application prospects are realized.

The invention provides a protection mechanism and a machine tool with the same, the protection mechanism is detachably arranged on a machine body, the protection mechanism comprises a main shaft fixing assembly, the main shaft fixing assembly comprises a first protection clamping plate and a second protection clamping plate, and a clamping space used for containing a main shaft is arranged between the first protection clamping plate and the second protection clamping plate; at least part of the first protection clamping plate and / or at least part of the second protection clamping plate are / is attached to the main shaft. The cross beam fixing assembly is detachably arranged on the machine body, and at least part of the cross beam fixing assembly is pressed on a cross beam of the machine body; the connecting support is arranged on the machine body, and the electric cabinet assembly of the machine body is fixedly arranged on the connecting support. According to the gantry machine tool, the problem that in the hoisting process of a gantry machine tool in the prior art, parts on the machine tool are prone to shaking, and consequently hoisting safety and efficiency are reduced is solved.

The invention relates to a preparation method and application of selenium-doped carbon quantum dots. The selenium-doped orange fluorescent carbon quantum dots are successfully prepared by treating a mixture of mangosteen peel, ethanol and sodium selenite through a hydrothermal method. Based on the excellent fluorescence property of the carbon quantum dots, the Cr < 2 + > can quench the fluorescence of the selenium-doped carbon quantum dots, so that the Cr < 2 + > can be detected. Meanwhile, the carbon quantum dot is found to be responsive to disease micromolecule glutathione, that is, glutathione can enhance fluorescence of the carbon quantum dot. By utilizing the concentration difference of glutathione in normal cells and cancer cells, the carbon quantum dots can realize the recognition of tumor cells. The orange fluorescent carbon quantum dot provided by the invention is prepared from easily available raw materials, and is safe and non-toxic. The prepared carbon quantum dot has stable fluorescent property, uniform particle size of 4.2 + / -0.5 nm, and relative quantum yield of 34.35%, can be imaged in cells, has GSH detection limit of 27.16 umol / L, and can identify tumor cells and normal cells.

This invention discloses a glass powder for the main grid paste of TOPCon crystalline silicon solar cells and its preparation method. The glass powder is obtained by mixing glass frits A and B obtained after cold rolling at a mass ratio of 1.5 to 2:1, followed by secondary melting and cold rolling. Glass frit A includes PbO, SiO2, B2O3, Li2O, Na2O, etc., and glass frit B includes Bi2O3, SiO2, AgNO3, B2O3, Li2O, Na2O, etc. Distilled water is added to glass frit B during the batching process to fully combine AgNO3 with other oxides, and the mixture is dried to a viscous state before sintering. During the sintering process, laser-enhanced contact optimization technology is used to reduce AgO in the glass to silver microcrystals, thereby improving the electrical performance of the main grid lines. The printed solar cells exhibit reduced damp heat decay, resulting in high module reliability and improved photoelectric conversion efficiency while ensuring high welding tensile strength. The resulting glass powder does not excessively etch the silicon nitride and aluminum oxide passivation layers, and the prepared slurry can be sintered at 650-800℃, which can meet the requirements of the front and back main grid electrodes of TOPCon batteries.

A kind of yarn tube raw paper interlayer bonding strength enhancer and preparation method thereof, it is characterized in that, raw material includes the following weight fraction components:0.15-0.25 parts of hemicellulose, 0.15-0.25 parts of starch, 0.05-0.1 parts of cation etherification agent, 0.001-0.005 parts of polyaldehyde, 0.02-0.04 parts of basic substance, 0.02-0.04 parts of catalyst, 0.6-0.7 parts of water.The component structure of the enhancer contains a large number of natural polymer, after modification contains rich hydroxyl, aldehyde group, carboxyl, cation, can enhance the combination between fiber hydroxyl, improve the retention of spray glue in paper, so as to improve the interlayer bonding strength of paper, ring pressure strength, breaking, folding resistance and other dry strength, at the same time, it can also reduce the dependence on edible starch, reduce the food crisis.

The application provides a pyridyl-containing covalent organic framework fiber composite film and a preparation method thereof. The preparation method comprises the following steps: mixing an amine monomer solution and an aldehyde monomer solution to perform a condensation reaction, obtaining a first mixed solution, and obtaining pyridyl-containing covalent organic framework nanoparticles after centrifugation; wherein the aldehyde monomer solution is obtained by mixing an aldehyde monomer and an acetic acid solution, and the amine monomer solution is obtained by mixing an amine monomer containing pyridyl groups and water; mixing the pyridyl-containing covalent organic framework nanoparticles and a nanocellulose solution to obtain a second mixed solution containing covalent organic framework nanocellulose; and performing film forming treatment on the second mixed solution to obtain the pyridyl-containing covalent organic framework fiber composite film. The covalent organic framework nanoparticles are combined with nanocellulose, the high crystallinity and pore characteristics of the covalent organic framework are retained, and the mechanical strength of the composite film is improved by using the mechanical properties of nanocellulose.

The present application relates to the field of battery technology, and in particular to a positive electrode slurry of a Prussian blue compound, a preparation method thereof, and a positive electrode sheet. The preparation method of the positive electrode slurry of the Prussian blue compound comprises the following steps: obtaining a Prussian blue compound solution with a solid content of 10% to 80% by a coprecipitation method; placing the Prussian blue compound solution, a binder, a conductive agent, and an optional thickener in a solvent and mixing them evenly to obtain a positive electrode slurry of the Prussian blue compound. This method solves the problem that the dry powder of the Prussian blue compound is difficult to disperse into the slurry, thereby improving the capacity and initial efficiency of the battery prepared by the positive electrode slurry prepared by the method.

The invention discloses a ranitidine hydrochloride small rod-like crystal habit preparation method, which comprises: directly crystallizing ranitidine hydrochloride in 95% ethanol to obtain ranitidine hydrochloride small rod-like crystal habit powder. The preparation method disclosed by the invention is beneficial to controlling the growth of NDMA impurities in ranitidine hydrochloride, the growth speed of the NDMA impurities in the prepared ranitidine hydrochloride small rod-like crystal habit powder is 40 times slower than that in commercially available ranitidine hydrochloride agglomerated crystal habit powder, and the stability is remarkably improved.

The invention discloses a sodium-ion battery negative electrode material as well as a preparation method and application thereof, belongs to the technical field of sodium-ion batteries, and solves the problem of poor universality of a sodium-ion battery negative electrode material modification method in the prior art. The preparation method comprises the following steps: carrying out surface rich oxidation treatment on a carbon negative electrode; carrying out two-step thermal reaction in an inert atmosphere; wherein in the first step, nitrogen / sulfur-containing small molecules are used for heteroatom doping; and 2, carrying out calcination treatment to remove heteroatoms, and naturally cooling to 25-30 DEG C to obtain the surface topological defect modified carbon negative electrode material. And physically mixing the surface topological defect modified carbon negative electrode material with the active heteroatom-containing small molecules, and carrying out heat treatment in an inert atmosphere to obtain the sodium ion battery negative electrode material. According to the negative electrode material prepared by the preparation method provided by the invention, the performance of the sodium-ion battery, especially the rate capability, the high-activity substance loading capacity and the low-temperature capacity, is remarkably improved.

This application discloses a dPCR chip and its preparation method, relating to the field of biotechnology, which simplifies the preparation process and reduces preparation costs. A dPCR chip includes: a substrate; and a base adhesive disposed on one side of the substrate. The base adhesive includes a plurality of pores arranged in a non-array configuration on the base adhesive, the pores being obtained by dissolving exposed particles mixed in the base adhesive.

The application provides a preparation method and a centering device of a size-controllable ultrathin high-quality echo wall optical crystal microcavity, and the method comprises the following steps: cutting a crystal material into a wafer and grinding and thinning the crystal thickness by using a polishing disc; placing an optical crystal microcavity blank on a microscope stage, adjusting two-dimensional adjustment knobs of the stage, and making the center of the optical crystal microcavity blank coincide with an origin of an objective micrometer scale; making a clamping rod with an adhesive adhered to a bottom end penetrate a top end through hole of a clamping rod fixing frame, and making the clamping rod align with the origin of the objective micrometer scale; adjusting the height of the clamping rod, making the optical crystal microcavity blank be pasted and fixed on the bottom end of the clamping rod by ultraviolet curing glue, and completing centering; taking the clamping rod off the clamping rod fixing frame, chamfering an outer circle of the optical crystal microcavity blank; grinding the outer circle surface of the optical crystal microcavity wafer by using sandpaper; polishing the optical crystal microcavity wafer, and obtaining the optical crystal microcavity based on the polished optical crystal microcavity wafer.

The invention discloses lamellar directionally-arranged boron nitride ceramic and a preparation method and application thereof, and belongs to the technical field of boron nitride ceramic preparation, and the method comprises the following steps: by using a template method, taking graphite as a matrix, alternately blade-coating inorganic glue and boron nitride powder on the surface of the matrix, and heating to prepare the lamellar directionally-arranged boron nitride ceramic. The lamellar directionally-arranged boron nitride ceramic prepared by the method can be used in the aerospace field of fighter tip radomes and the like, and has the characteristics of excellent high-temperature oxidation resistance and small change of mechanical properties along with temperature.

The present application relates to a resonator and a manufacturing method thereof. The resonator comprises an interdigital transducer. The interdigital transducer comprises a bus bar unit and an interdigital electrode unit. The bus bar unit comprises two bus bars opposite in a first direction. The interdigital electrode unit is located between the two adjacent bus bars. In the first direction, the area between the two bus bars is configured as a plurality of acoustic channels based on the interdigital electrode unit. The part of the interdigital electrode unit located in each acoustic channel constitutes an interdigital electrode group. Wherein, the structure of any two adjacent interdigital electrode groups is different. And the resonant frequency of the main mode in the plurality of acoustic channels is the same. The working performance of the resonator is stable, and the excitation position and strength of the spurious wave generated in the working process of the resonator are dispersed, so that the out-of-band suppression performance of the resonator is effectively improved. And the structure of the interdigital electrode in the resonator and the structure of the interdigital electrode group can be flexibly adjusted based on actual needs. The manufacturing method is simple and easy to implement.

The present invention discloses a molybdenum-containing mesoporous alumina molecular sieve and its preparation method and application. Based on the weight of the molybdenum-containing mesoporous alumina molecular sieve, the molybdenum content is 10wt% to 35wt%, preferably 20wt% to 25wt%; the specific surface area of ​​the molybdenum-containing mesoporous alumina molecular sieve is 250 to 450m 2 / g, pore volume is 0.20~0.35cm 3 / g. The present invention successfully introduces molybdenum into the mesoporous alumina molecular sieve in one step through a one-step gel method, and by using an additive, the interaction between alumina and molybdenum particles is enhanced, the molybdenum is evenly dispersed on the alumina, the accumulation of molybdenum on the alumina is avoided, the increase of particle size is suppressed, and combined with the regulation of preparation conditions, a molybdenum-containing mesoporous alumina molecular sieve with high molybdenum dispersion and high specific surface area can be obtained at a lower temperature. The molybdenum-containing mesoporous alumina molecular sieve of the present invention is particularly suitable as a catalytic material for the hydrodesulfurization of sulfur-containing hydrocarbons.

The invention relates to a copper sulfide-platinum reticular ultrathin nanosheet as well as a preparation method and application thereof. The microstructure of the nanosheet is a two-dimensional reticular structure consisting of copper sulfide and platinum. The copper sulphide-platinum ultrathin nanosheet is prepared through a replacement reaction means, and the net structure of the copper sulphide-platinum nanosheet is effectively regulated and controlled, so that the catalytic photodegradation performance of the copper sulphide-platinum ultrathin nanosheet is improved. The porous structure and the ultrathin structure of the copper sulfide-platinum netted ultrathin nanosheet are beneficial to providing abundant active sites, high specific surface area, efficient charge transfer and the like, and can provide better photodegradation efficiency. The preparation steps are simple, reactants are low in toxicity, hazardous chemicals are not contained, and the process is green and environment-friendly.

The invention discloses a laser cladding type additive manufacturing YBCO high-temperature superconductor system and method, and relates to the technical field of superconducting ceramic preparation. In order to solve the problems of low processing efficiency and complicated steps in the existing YBCO superconducting ceramics, the following technical scheme is provided: the device comprises a laser, a powder feeder, a mechanical arm and a cladding head, the mechanical arm drives the cladding head to move according to a printing path, and the laser conveys laser to the cladding head through an optical fiber; the powder feeder feeds powder into the cladding head, laser melts the powder and solidifies the powder on a substrate of the rotary table to form a three-dimensional complex structure, temperature distribution of a manufacturing structure is fed back through the infrared temperature sensor, and the camera monitoring system captures the deposition quality of a sample structure in real time. The method has the beneficial effects of high precision, high efficiency, high material utilization rate, good flexibility, low cost and the like, and provides a new and promising technical approach for preparation of the high-temperature superconducting material.

The application discloses a kind of sodium ion battery hard carbon negative electrode material and preparation method thereof, belong to carbon material synthesis and electrochemistry technical field.The hard carbon negative electrode material is the material of animal hair biological substance after being prepared by pre-oxidation treatment, inert atmosphere pyrolysis, uniform speed cooling and crushing treatment.The application determines the corresponding relationship between the interlayer spacing, micropore quantity and surface oxygen-containing group of animal hair biological substance fiber under pre-oxidation-inert atmosphere temperature pyrolysis, sodium storage capacity and cycle stability, and the hard carbon negative electrode based on rabbit hair prepared by optimal condition realizes 265.30mAh g ‑1 The sodium storage specific capacity of 50mA g ‑1 Current density is 300 cycles after 88.55% capacity retention rate.The low-cost large-scale preparation scheme of hard carbon negative electrode material proposed by the application can be industrialized and popularized, which provides technical reference for the industrialization development of sodium ion battery.

The application provides a preparation method and application of a metallocene polypropylene catalyst. The first aspect of the application provides a preparation method of a metallocene polypropylene catalyst, comprising the following steps: subjecting a carrier to a thermal activation treatment to obtain a thermally activated carrier; loading a first cocatalyst on the thermally activated carrier to obtain a thermally activated carrier after loading of the first cocatalyst; preparing a catalyst precursor by using a second cocatalyst, a metallocene compound and an indole compound; and reacting the thermally activated carrier after loading of the first cocatalyst with the catalyst precursor to obtain the metallocene polypropylene catalyst. The preparation method of the metallocene polypropylene catalyst can effectively improve the activity and stereoregularity of the metallocene polypropylene catalyst by adding an electron donor of the indole compound to modify an active center in the preparation process of the metallocene polypropylene catalyst; and meanwhile, the preparation process is simple, and the types of chemical reagents used are few.

The present application belongs to the technical field of solid amine adsorbent preparation, and specifically relates to a solid amine honeycomb adsorbent and its preparation method and application. The preparation method comprises the following steps: subjecting a honeycomb carrier and an organic amine mixed solution to a loading treatment and then subjecting them to a synthetic reaction, and then subjecting them to impurities removal and drying to obtain a solid amine honeycomb adsorbent; wherein the organic amine mixed solution comprises: an organic amine, a silane, a surfactant and an organic solvent. The method can prepare the solid amine honeycomb adsorbent in one step, and the organic amine can be uniformly loaded on the honeycomb carrier in one step.