35results about How to "Precise control of shape" patented technology

The invention discloses a double transition metal doped RuO2 acidic OER electrocatalyst and a preparation method and application thereof, relates to an OER electrocatalyst and a preparation method and application thereof, and aims to solve the technical problems of high overpotential and poor stability of the existing transition metal doped RuO2 catalyst.The catalyst is (M1) x (M2) yRuO2, M1 is Zr or Ti, and M2 is a transition metal doped RuO2 catalyst or a transition metal doped RuO2 catalyst or a transition metal doped RuO2 catalyst or a transition metal doped RuO2 catalyst or a transition metal doped RuO2 catalyst or a transition metal doped RuO2 catalyst or a transition metal doped RuO2 catalyst or a transition metal doped RuO2 catalyst. M2 is Mo, Nb or Tc; x is equal to 0.02 to 0.1, and y is equal to 0.02 to 0.1. The preparation method comprises the following steps: adding ruthenium salt, M1 salt, M2 salt and ethanol into water, putting the obtained mixed solution into a homogeneous reactor for hydrothermal reaction, washing and drying the product, and annealing. According to the present invention, the prepared electrode is loaded on carbon paper to prepare the electrode for acidic OER electro-catalysis, has the overpotential of 224 mV under the current density of 10 mAcm <-2 >, has excellent stability within 200 h, and can be used in the field of water electrolysis hydrogen production.

According to the method for preparing the nanoscale carbonyl iron powder under the conditions of normal pressure and low temperature and the special integrated equipment for implementing the method, efficient cooling and nucleation of iron steam can be achieved by adopting a specially-designed micro-nano bubble generation device, and the nanoscale carbonyl iron powder which is narrow in particle size distribution, uniform in morphology and excellent in magnetic performance is prepared.

The invention discloses a preparation method of oxygen-deficient tungsten oxide WO2.72 nanospheres with photodegradation adsorption performance, which comprises the following steps: firstly, providing cations by using urea, embedding the cations into tungsten oxide to form a non-stoichiometric compound ammonium tungsten bronze (NH4) 0.33 WO3, capturing and separating out cations NH4 < + > in holes by using OH <-> radicals provided by deionized water in a mixed solution, and promoting the valence state of W to be reduced from W < 6 + > to W < 5 + >, thereby obtaining the oxygen-deficient tungsten oxide WO2.72 nanospheres with photodegradation adsorption performance. Meanwhile, in the synthesis process, the alcohol serves as a solvent, on one hand, a reaction medium needed for synthesizing the WO2.72 is provided, on the other hand, through interaction of the alcohol, the urea and the deionized water, growth and morphology of the product are controlled, the final product WO2.72 is synthesized, the WO2.72 synthesized in the mode not only solves the agglomeration problem of WO2.72 synthesized in the prior art, but also improves the yield of the WO2.72. And moreover, by accurately controlling the synthesis conditions, accurate regulation and control on the morphology and the size of the product are realized, and the adsorption and photodegradation properties of the product are improved.

According to the ginseng extraction system and method provided by the invention, the dual goals of high purity and high yield of ginsenoside extraction are achieved through raw material adaptive parameter pre-optimization, self-adaptive cascade purification and activity protection, the enrichment effect of high-value monomer saponin is remarkable, and the loss of active ingredients is accurately controlled. According to the application, a detection-decision-regulation full-process closed-loop intelligent control system is constructed, near infrared spectrum rapid screening and HPLC-MS / MS accurate quantitative dual-mode online detection are fused, real-time and accurate monitoring of the saponin content is realized, and off-line detection and artificial experience parameters are not needed; the multi-target central control unit can automatically decide a purification path and process parameters according to detection data, and designs such as membrane pollution on-line monitoring, automatic backwashing and solvent circulating preheating are combined, so that continuous operation of the process is ensured, and production interruption caused by equipment failure and process fluctuation is avoided.

The invention discloses a preparation method of metal nanoparticles with accurate morphology regulation and control. According to the preparation method, an electrolyte is electrolyzed by adopting a conductive anode material, and the morphology of nano metal particles electrodeposited on a conductive cathode is accurately regulated and controlled by adjusting the types of additives in the electrolyte. The invention further provides a preparation method of the additive in the electrolyte, and the nano metal particles in the shapes of spheres, flowers, urchins, sheets, cubes and the like can be obtained through electro-deposition by controlling the adding types of the additive, and the shapes of the nano metal particles are accurately regulated and controlled. The synthesized ionic liquid capable of being used for the electrolyte additive serves as an electro-deposition electrolyte additive for accurately regulating and controlling the morphology of nano-metal particles, the morphology of the nano-metal particles prepared through electro-deposition can be accurately regulated and controlled, production steps of the nano-metal particles with different morphologies are reduced, and the production cost is reduced; meanwhile, the method has the characteristics of low energy consumption, high yield, simple process, safety, environment friendliness and the like.

The invention provides a size-adjustable zinc oxide nano array as well as a preparation method and application thereof, and belongs to the technical field of nano arrays. The zinc oxide nano array comprises a conductive film and a zinc oxide nano rod array cluster, wherein the zinc oxide nanorods vertically grow on the conductive thin film, and the zinc oxide nanorods aggregate and grow to form an array cluster; the array cluster structure grows periodically in a large area and is distributed periodically on the conductive film. The zinc oxide nanorod array provided by the invention is realized through a photoetching template. And the zinc oxide nano array structures with different sizes or shapes are obtained on the surface of the ITO electrode by adjusting the sizes and patterns of the reserved holes in the template, so that the zinc oxide nano array structure can be applied to different application fields such as photoelectric detectors, photocatalysts and solar cells. The zinc oxide nano array structure disclosed by the invention has the advantages of simple preparation method, controllable structure, better uniformity, better stability and the like, and is beneficial to popularization and application.

The invention relates to the technical field of vanadium pentoxide preparation, and particularly provides a flake vanadium hot-pressing process which comprises three steps of dehydration and deamination treatment, high-temperature thermal decomposition and hot-pressing molding. According to the process, a hot stamping mode is used for replacing a traditional process, the process is simpler, powdery vanadium pentoxide is directly subjected to hot press forming, the solid-liquid-solid phase change process is not needed, energy consumption is reduced, meanwhile, the forming time of the flake vanadium is shortened, and the preparation efficiency of the flake vanadium can be effectively improved; and meanwhile, the density and the shape of the flake vanadium can be accurately controlled only by adjusting hot pressing parameters and a hot pressing mold, and products can be flexibly customized according to different application requirements.

The invention discloses a cloud-shaped pomelo peel biomass derived carbon broadband absorbing material which has an absorption wave range of-40 dB to-60 dB and a wide absorption bandwidth of 6-8 GHz. The invention also discloses a preparation method of the broadband absorbing material. The preparation method comprises the following steps: firstly, selecting waste shaddock peel and preparing cloud-shaped biomass derived carbon through heat treatment; then cobalt nitrate hexahydrate and zinc nitrate hexahydrate are mixed according to a certain mass ratio, hydrothermal treatment is carried out, Co / ZnO is promoted to grow on the surface of biomass-derived carbon in situ, and the biomass-carbon-based microwave absorbing material with broadband absorption bandwidth and excellent impedance matching characteristics is prepared. The method provides a new technical path for the development of the biomass carbon composite microwave absorbing material. The preparation process is simple, environment-friendly and low in cost, has good repeatability and consistency, and is suitable for large-scale production.

This invention relates to lithium / sodium-ion battery technology, aiming to provide a negative electrode material utilizing few-layer MXene roll-up encapsulation of tin phosphide and its preparation method. The negative electrode material includes a few-layer T3C2 MXene as a load substrate and tin phosphide particles as active centers; the tin phosphide particles are uniformly dispersed in the few-layer T3C2 MXene, and the sheet structure of the T3C2 MXene encapsulates the tin phosphide particles within it through mechanical roll-up. This invention enables precise control of the particle size, morphology, and crystal phase of tin phosphide particles, mitigating the damage to the material structure caused by conventional processes and reducing energy consumption. This invention achieves uniform dispersion of tin phosphide particles in conductive MXene through in-situ growth, while the excellent encapsulation effect formed by ball milling effectively suppresses tin phosphide particle shedding, structural damage, and excessive interfacial side reactions, ensuring the structural stability and sufficient electrical contact of the negative electrode material during cycling, thereby improving charge-discharge cycle stability and rate performance.

The novel zoom indoor spotlight comprises a shell, a light source assembly, a focusing assembly and a lens assembly, and the focusing assembly comprises a rear lens, a front lens and a focusing mechanism; the small end of the rear lens is close to the light source assembly, and the surface of the small end is provided with a light inlet hole. A shaft hole is formed in the middle of the large-end surface of the rear lens, and a plurality of first annular concave-convex surfaces in a concentric ring array are arranged on the large-end surface; a rotating shaft rotationally matched with the shaft hole is arranged in the middle of the back surface of the front lens, and a plurality of second annular concave-convex surfaces arrayed by concentric rings are arranged at the non-middle position of the back surface; a plurality of first convex parts which are distributed circumferentially are arranged on the first annular concave-convex surface, and the surface of each first convex part is an arc-shaped convex surface; a first concave part is arranged at the position, corresponding to the first convex part, of the second annular concave-convex surface, and the bottom surface of the first concave part is an arc-shaped concave surface. The utility model has the characteristics of stable and accurate focusing, sealed and durable structure, small volume, wide application range, long service life and the like.

The invention relates to a multiphase composite flame-retardant waterproof coiled material and a preparation method thereof. The flame-retardant waterproof coiled material comprises an upper waterproof layer, a flame-retardant middle layer and a lower waterproof layer which are sequentially laminated and compounded from top to bottom, the upper waterproof layer and the lower waterproof layer are thermoplastic polymer layers; the flame-retardant middle layer comprises a base material layer, at least one first patterned flame-retardant layer combined on the upper surface of the base material layer and / or at least one second patterned flame-retardant layer combined on the lower surface of the base material layer, and a thermoplastic protective adhesive layer covering the surfaces of the patterned flame-retardant layers and the surface of the base material layer; the horizontal shape of the patterned flame-retardant layer is a two-dimensional area shape and corresponds to the plane outline of at least one fire risk area preset on the target laying surface.

The present invention provides a mesoporous UiO-67-wrapped Zn or Cu particle catalyst and its preparation method and application, belonging to the technical field of material preparation. The present invention first synthesizes Zn or Cu particles, then in-situ synthesizes UiO-67, and finally reacts with solvent thermal etching of a pore-forming agent solution. By adjusting the concentration, reaction time and temperature of the reactants, Zn or Cu particles and UiO-67 and mesoporous UiO-67 can be obtained to wrap Zn or Cu particle catalysts, and retain the morphology and framework structure of UiO-67 itself. The catalyst size of the present invention is 1-2.5 μm, the pore size range is 5-50 nm, the Zn or Cu particle size is 20-70 nm, and the Zn or Cu particles account for 3-8% of the catalyst mass. The synergistic effect of its mesoporous structure and Zn or Cu particles and the etching reaction expose more active sites of the catalyst, which is applied to the catalytic field of preparing vinylene carbonate from dichloroethylene carbonate, and the conversion rate of dichloroethylene carbonate is more than 85%, and the selectivity of vinylene carbonate is more than 95%.

The invention discloses a heterogeneous composite structure microcarrier and a controllable preparation method thereof. The preparation method comprises the following steps: dissolving collagen and a coating drug in dilute acetic acid to obtain a solution A; dissolving PLCL and a pore-foaming agent in an organic solvent to obtain a solution B; mixing the solution A and the solution B, and mechanically homogenizing to obtain a mixed emulsion as a dispersed phase O; dissolving a surfactant in deionized water to respectively serve as a continuous phase W and a collection liquid Wo; adjusting the pH values of the continuous phase W and the collected liquid Wo to 7.5-9.0; respectively injecting the continuous phase W and the dispersed phase O into a two-phase micro-channel, shearing the dispersed phase O into micro-emulsion drops with uniform size, receiving the micro-emulsion drops in a collecting solution Wo, standing or horizontally rotating and curing, washing and freeze-drying to obtain the heterogeneous composite structure microcarrier; the microcarrier prepared by the invention has concentrated particle size distribution, good initial cell adhesion efficiency and biodegradability, can provide adhesion sites and mechanical support for cells at the same time, and meets carrier functions required by in-vitro culture and in-vivo implantation of cells.

The invention discloses superfine TiO2 powder and a preparation method thereof, and relates to the technical field of titanium dioxide, the preparation method comprises the following steps: adding TiCl4 into deionized water to prepare a TiCl4 solution; adding a modified dispersant into deionized water to prepare a modified dispersant solution; adding a TiCl4 solution into the modified dispersant solution, and carrying out heat preservation hydrolysis to obtain a metatitanic acid solution; naturally cooling and aging the metatitanic acid solution, and filtering to obtain a metatitanic acid filter cake; putting the metatitanic acid filter cake into a sagger, sintering at high temperature, and crushing to obtain the superfine TiO2 powder, and finally, the superfine TiO2 powder with uniform particle size, good dispersity and high sphericity can be obtained.

The application belongs to the technical field of catalyst material preparation, and provides a single-atom porous material catalyst, a preparation method thereof and application of the single-atom porous material catalyst in a methane aerobic conversion reaction. The application introduces reaction gas containing a gaseous metal precursor, a carbon source and a nitrogen source into a plasma reaction chamber, and uses plasma for chemical vapor deposition to obtain the single-atom porous material catalyst. The preparation method provided by the application can select gaseous, liquid or solid raw materials as a source of the gaseous metal precursor. The application can prepare various types of single-atom porous material catalysts, and enriches the application range of the single-atom porous material catalysts. The application realizes control of the particle size, morphology and distribution of the single-atom porous material catalyst by adjusting reaction parameters, and the prepared single-atom porous material catalyst can be used in the methane aerobic conversion reaction. Therefore, the preparation method provided by the application is simple in operation, strong in universality and has a good industrial application prospect.

The application relates to a complex curved surface shock wave body counter-design method based on a three-dimensional curved flow surface method, and relates to a hypersonic wave body. The complex curved surface shock wave body is provided with a complex curved surface shock wave body lower surface compression profile, a complex curved surface shock wave body upper surface profile and a complex curved surface shock wave body leading edge profile; the complex curved surface shock wave body lower surface profile and the complex curved surface shock wave body upper surface are connected by the complex curved surface shock wave body leading edge profile. A complex curved surface three-dimensional outflow shock wave is specified, and a wave body capture profile is designed; the complex curved surface shock wave is dispersed into a series of initial flow surfaces; shock wave angles, shock wave curvatures and wave rear parameters are solved; a complex shock wave curved surface wave rear flow field is solved, and a compression profile is determined; a wave body upper surface geometric shape is constructed according to design requirements; and the upper and lower surfaces are connected to form a complete complex curved surface shock wave body geometric shape. The method has higher calculation efficiency and higher precision, and provides a wider performance improvement space for aircraft design through free shock wave selection.

The invention belongs to the technical field of water electrolysis hydrogen production catalysis, and particularly relates to a transition metal oxide (TMO)-rare earth oxide (REO) heterojunction nanocomposite as a water electrolysis anode oxygen evolution reaction (OER) catalyst, a transition metal oxide is used as an electron acceptor, a rare earth oxide is used as an electron donor, the transition metal oxide and the rare earth oxide form a tight heterojunction interface, and the hydrogen production efficiency is improved. According to the structure, a rare earth (4f)-oxygen (2p)-transition metal (3d) active unit is constructed, the electronic structure is effectively regulated and controlled through strong electron transfer between interfaces, the bonding stability of transition metal-oxygen is enhanced, the conversion from a traditional adsorbate precipitation mechanism to a lattice oxygen mechanism is realized, and the surface active site density is greatly improved by forming a nanoscale heterogeneous interface, so that the stability of the structure is improved. The OER catalytic performance and stability are improved; the overpotential of the composite material under the current density of 10 mA / cm is lower than 250 mV, the Tafel slope is smaller than 40 mV / dec, and the performance is superior to that of a commercial IrO2 catalyst.

This invention discloses an electro-optic modulator and its manufacturing method, belonging to the field of silicon photonics technology. The manufacturing method of the electro-optic modulator includes: providing a substrate; forming a first device pattern on the substrate; forming a protective layer flush with the top surface on the first device pattern and the substrate, wherein the first device pattern has a first region for ion implantation and a second region for ion implantation; forming a blocking pattern on the protective layer outside the first region, at least covering the second region; forming a first photoresist pattern on the protective layer for ion implantation of the first region, forming a first ion implantation region; removing the first photoresist pattern; forming a dielectric layer on the protective layer; and removing the dielectric layer on top of the blocking pattern; forming a second photoresist pattern on the dielectric layer, wherein the opening area of ​​the second photoresist pattern is not smaller than that of the blocking pattern; removing the blocking pattern; and performing ion implantation on the second region, forming a second ion implantation region. By setting the blocking pattern as an ion implantation mask and removing the blocking pattern in subsequent implantation, and then performing ion implantation again, two ion implantation regions with controllable spacing are formed, enabling the formation of a stable lateral PN junction structure.

The invention discloses a one-dimensional C60 nano chain and a preparation method thereof. The preparation method comprises the following steps: preparing an Au (111) surface; the preparation method comprises the following steps: depositing n-butyl mercaptan molecules on an Au (111) surface through a vapor deposition method, so that the n-butyl mercaptan molecules are assembled on the Au (111) surface in a close-packed manner, annealing, and forming a strip-shaped phase molecular template through self-assembly of the n-butyl mercaptan molecules; a molecular beam epitaxy method is adopted to grow C60 molecules on a strip-phase molecular template, and the C60 molecules are adsorbed and self-assembled on the strip-phase molecular template to form a one-dimensional C60 nano chain. The method has the advantages of high atomic precision and high purity, can regulate and control the forming process of the C60 molecular nano chain on the atomic scale, prevents agglomeration, and can precisely regulate and control the morphology and size of the nano chain.

The application discloses a glass microporous vacuum adsorption device with optical flatness and a manufacturing method thereof, and belongs to the technical field of precision machining and semiconductor manufacturing. The vacuum adsorption device comprises a glass substrate and an equalizing structure in communication with the glass substrate. The glass substrate is provided with a through micropore array manufactured by using an ultrafast laser processing technology. The micropore array is composed of a plurality of micropores penetrating along the thickness direction of the glass substrate. The micropore array is formed by ultrafast laser-induced modification and selective chemical etching. After the through micropores are formed, no additional surface polishing treatment is needed to maintain the optical flatness of the adsorption surface. The equalizing structure is in communication with an external vacuum system through a suction port to form a uniform negative pressure distribution on the adsorption surface. The vacuum adsorption device is suitable for adsorbing and fixing an ultrathin wafer. The application can realize uniform adsorption and reduce the risk of warping and scratching.

The invention provides a metal catalyst loaded on the basis of a biological carrier, a method and application of the metal catalyst. The preparation method of the catalyst comprises the following steps: adding one or more than two metal ion-containing solutions into the biological carrier to obtain a mixed solution; a reducing agent is added into the mixed solution for a reduction reaction, the reducing agent comprises but is not limited to sodium borohydride, sodium hydroxide, ascorbic acid and sodium citrate so as to form a metal catalyst with metal nanoparticles loaded on the surface of the biological carrier, the obtained metal catalyst has catalytic activity of multiple enzymes, the synthesis process is green and environmentally friendly, and the method is suitable for industrial production. The obtained catalyst has high activity, can be used for prediction and diagnosis of disease markers such as prostatic cancer, gout and diabetes, and has wide application prospects in biological medicines and diagnostic reagents.

The invention relates to the technical field of heterojunction preparation, in particular to a preparation method of a sandwich type two-dimensional flaky heterojunction. The preparation method comprises the following steps: dissolving CsBr in a precursor solvent to obtain a precursor solution A; biBr3 and AgBr are dissolved in HBr, and a precursor solution B is obtained; the ratio of the mole of the BiBr3 to the volume of the HBr is (0.29 mmol): (0.09 to 0.18 mmol): 2.3 mL; mixing the precursor solution A, the precursor solution B and isopropanol to obtain a precursor solution C; and heating the precursor solution C to 90-95 DEG C, and naturally cooling to obtain the sandwich type two-dimensional sheet heterojunction. By changing the molar ratio of Ag / Bi and adding isopropanol, the speed of synthesizing the heterojunction by a traditional two-step method is increased, the morphology of the heterojunction is accurately regulated and controlled, and the sandwich type heterojunction with a large specific surface area is formed.

The utility model discloses a horizontal bottom seat flexible interface double rubber ring reinforced concrete pipe production device relates to reinforced concrete pipe production technical field, and it is including: base, outer mould, inner mould, jacking mechanism and traction mechanism, and the inner mould is seamless hollow cylinder, and the inner mould is used to install in the outer film, to form the pouring space of double rubber ring reinforced concrete pipe between the outer mould and the inner mould, and one end of the inner mould is provided with jacking part, and the other end is provided with traction part, the jacking mechanism is set up in the one side of base, when the strength of double rubber ring reinforced concrete pipe reaches 70%~75% of design strength, and the jacking mechanism jacks up the jacking part to make the initial separation gap between the inner mould and double rubber ring reinforced concrete pipe, the traction mechanism is set up in the one side of base away from the jacking mechanism, and the traction mechanism is used for connecting with traction part to pull out the inner mould horizontally, simple structure, convenient to use, effectively solve the horizontal production process to face the inner mould demoulding problem, effectively improve the inner wall forming quality.

The invention discloses a board-level packaging structure and a manufacturing process thereof, the board-level packaging structure comprises a packaging body and a terminal, at least part of the terminal protrudes out of the surface of the packaging body, the side wall of the terminal is provided with a step-shaped structure, and a metal surface area capable of being wetted by welding flux is formed on the lower portion of the step-shaped structure. According to the invention, the wettability side surface is created through the step-shaped structure, so that the liquid solder can fully wet and wrap the side wall of the terminal, a firm, complete and void-free three-dimensional welding interface is formed, and the connection reliability is greatly improved; the effective welding area is increased, the interface thermal resistance is reduced, and the heat dissipation capability is improved; meanwhile, the firm lateral connection enhances the mechanical stress and thermal stress resistance of the packaging body, so that the power cycle life is prolonged, and the overall reliability is improved; on the basis of a mature board-level packaging process, only a pre-cutting step needs to be added before a final cutting process, so that the technological process is slightly changed, the equipment compatibility is high, the implementation is easy, and the cost is controllable.

The invention belongs to the technical field of magnetic resonance imaging nano diagnosis and treatment agents, and particularly relates to a preparation method of a shape-controllable nonmetal magnetic resonance imaging nano diagnosis and treatment agent. According to the preparation method, 2-(perfluorooctyl) ethyl methacrylate (HDFDMA) and methacrylic acid-2, 2, 6, 6-tetramethyl-4-piperidinyl ester (m-TEMPO) are taken as monomers to prepare shape-controllable sugarcoated haw-shaped nano-particles (WNPT), electronegative tannic acid (TA) is loaded after oxidation, and the shape-controllable sugarcoated haw-shaped nano-particles are prepared through a polymerization-induced self-assembly method. The nanometer diagnosis and treatment agent TA (at) WNPT with a magnetic resonance imaging (MRI) function and a colitis treatment function is obtained. According to the method disclosed by the invention, polymerization and assembly are synchronously carried out under the condition of high concentration, and the morphology, size and surface chemical characteristics of the nanoparticles are accurately regulated and controlled. It is proved for the first time that in the nonmetal MRI probe, compared with spherical particles, the sugarcoated haw-shaped structure can remarkably improve the MRI performance.

The invention provides a supercapacitor bimetallic oxide electrode, a preparation method thereof and a planar miniature supercapacitor, and belongs to the technical field of supercapacitors. According to the method, the copper sheet is subjected to etching treatment through wire cut electrical discharge machining to obtain the molybdenum-copper bimetallic oxide material, then the molybdenum-copper bimetallic oxide material is subjected to patterned cutting through wire cut electrical discharge machining, digital control can be achieved, the preparation process is simple, patterning is easy, the preparation process is low in cost and free of pollution, and the method is suitable for industrial production. And the obtained electrode material is excellent in electrochemical performance and good in universality. The result of the embodiment shows that the area specific capacitance of the prepared supercapacitor bimetallic oxide electrode can reach 27.5 mF cm <-2 > at the scanning speed of 5mV s <-1 >, and the supercapacitor bimetallic oxide electrode has excellent electrochemical performance.

The invention relates to a titanium-tungsten alloy etching solution and a preparation method thereof. The etching solution is prepared from 10-16% of H2O2, 5-10% of phosphoric acid, 0.1-1% of organic acid, 2-4% of alkali, 1-5% of inhibitor and the balance of deionized water. Wherein the inhibitor can inhibit corrosion of the etching liquid to the Ti film layer and protect the Ti film layer from being corroded or slightly corroded. The preparation method comprises the step of sequentially adding the deionized water, the phosphoric acid, the organic acid, the alkali, the inhibitor and the H2O2 into a mixing kettle. According to the method, the TiW layer can be etched slowly and uniformly, the morphology after etching is accurately controlled, and meanwhile, the Ti layer can be effectively protected from being corroded or slightly corroded.

The application discloses a controllable preparation method and application of Janus structure phenolic resin and derived carbon material, and belongs to the technical field of materials. The Janus structure phenolic resin material has a bottle-shaped structure appearance; the bottle-shaped structure comprises a spherical-bottom bottle body and a bottle mouth in the shape of a droplet; and the bottle neck between the spherical-bottom bottle body and the bottle mouth is dumbbell-shaped with a shrinkage in the middle of the side contour. The application can controllably synthesize Janus structure nanomaterials with specific morphologies by constructing an oil-in-water microemulsion template and adjusting the assembly mode of polymer precursors at the oil-water interface, so that the Janus structure nanomaterials can meet the application requirements in different fields. The application solves the problems of complicated operation process and high requirements in the prior art, and simultaneously, the method is one-pot synthesis, does not need to remove the template twice, is simple in preparation, accurate in control, and green and environment-friendly. The obtained Janus structure phenolic resin material and derived carbon material have potential applications in the fields of energy storage and conversion, catalysis, environmental governance, biological medicine and the like.

This invention provides a novel method for preparing a self-supporting porous supercapacitor material, belonging to the field of supercapacitor electrode materials. The preparation method includes the following steps: immersing nickel foam in a corrosion solution containing iron salts and a sulfur source, then placing it within the coil of an alternating magnetic field induction heating device for in-situ corrosion reaction, generating an Fe-doped nickel-based composite on the pore walls of the nickel foam, thus obtaining a precursor; drying and oxidizing the precursor to obtain the novel self-supporting porous supercapacitor material; the sulfur source includes one or both of thiosulfate and thiourea; the nickel-based composite includes Ni(OH)₂ and Ni₃S₂; the nickel-based composite is a porous structure composed of nanoclusters; adjacent pores in the porous structure are interconnected. The synergistic effect of the thermal, electric, and magnetic fields of the alternating magnetic field accelerates corrosion kinetics, promotes the formation of a bicontinuous porous structure, and enhances the electrochemical energy storage performance of the material.

This utility model provides a turning tool device for notched sample machining, including an indexable insert, a tool holder, and a screw. The indexable insert and the tool holder are fixedly connected by the screw. The tool holder is a CNC external turning tool straight head tool holder, with a diamond-shaped insert mounting groove at the head. A threaded hole that mates with the screw is located in the center of the insert mounting groove. The indexable insert has a central through hole coaxial with the threaded hole in the middle. The insert is replaced and fixed by screwing through the screw and screwing it into the tool holder.