484 results about "Bilayer" patented technology

The invention discloses an S-shaped micro-channel heat dissipation device with a double-layer turbulent flow structure and a use method, belongs to the field of liquid cooling heat dissipation, and is suitable for heat dissipation of a high-heat-flux device or a heat conduction device. The device comprises a base, a cover plate, a micro-channel body, turbulent flow columns, a flow guide structure, O-shaped sealing rings and quick-screwing connectors, the micro-channel body is provided with S-shaped channels which are vertically symmetrical, the turbulent flow columns are evenly arranged in the centers of the channels, and the top ends of the turbulent flow columns are flush with the end face of the micro-channel body. The turbulent flow columns can be rectangular columns or water-drop-shaped columns which are arranged in a single row or multiple rows at equal intervals and are matched with the flow guide structure to achieve efficient flow division of cold and hot fluid and interlayer heat interaction. Fluid mixing is strengthened through the centrifugal force of the S-shaped channel, a heat boundary layer is destroyed by the turbulent flow columns, and the problems that a traditional straight channel is low in heat exchange efficiency and uneven in temperature distribution are solved. Deionized water or nanofluid is selected as cooling liquid, closed circulation is formed by entering and exiting of the cooling liquid through the quick-screwing connector, and the adaptive scene and the comprehensive performance of the device are further expanded through the multiple rows of turbulent flow columns or the water-drop-shaped turbulent flow columns.

The invention belongs to the field of heat conduction materials, and particularly relates to gradient interface modified aluminum oxide-aluminum nitride bi-component heat conduction filler and a preparation method thereof, and the gradient interface modified aluminum oxide-aluminum nitride bi-component heat conduction filler comprises spherical aluminum oxide, flaky aluminum nitride and double gradient modified layers coating the surfaces of the spherical aluminum oxide and the flaky aluminum nitride; the D50 of the spherical aluminum oxide is 2-5 microns, and the sphericity is greater than or equal to 0.85; the sheet-shaped aluminum nitride is in a hexagonal sheet shape, the average particle size is 8-12 microns, the thickness is 200-500 nanometers, and the radius-thickness ratio is 20-50; the mass ratio of the spherical aluminum oxide to the flaky aluminum nitride is (40-70): (30-60); the double-layer gradient modification layer comprises an inner-layer hydrophobic silane layer and an outer-layer reactive silane layer, the inner-layer hydrophobic silane layer is formed by grafting alkyl trialkoxy silane with the carbon chain length of 8-16, the outer-layer reactive silane layer is formed by grafting a silane coupling agent containing an epoxy group or an amino group, and morphological complementary optimization of a filler network is achieved.

The invention provides a polarization selectivity all-dielectric high-saturation structural color metasurface with a maintainable color center. The metasurface sequentially comprises a SiO2 semi-ellipsoid layer, a GaN elliptic cylinder array and a PDMS flexible substrate from top to bottom, wherein the SiO2 semi-ellipsoid layer and the GaN elliptic cylinder array form a periodically arranged double-layer all-dielectric nanostructure unit. Under the condition of x polarization incidence, the structure generates a narrow-band high-reflection structural color in a visible light wave band, the full width at half maximum of a main reflection peak is about 9 nm, the peak reflectivity can reach 99.8% or above, and the reflectivity of a secondary reflection peak on the short wave side is lower than 0.01; and under the y polarization incidence condition orthogonal to the light source, the reflectivity near the corresponding wavelength is lower than 2%, and the light source shows remarkable polarization selectivity. The inventor further finds that when the equivalent radius change of the nano unit causes the reduction of the reflection efficiency, the reflectivity of the main peak can be recovered by adjusting the long-short axis ratio of the GaN elliptic cylinder and the SiO2 semi-ellipsoid, and the central wavelength of the main formant is basically kept unchanged, so that the brightness adjustment is realized on the premise that the color center is basically constant. The structure is suitable for flexible or wearable optical devices, polarization-related structural color display and other applications.

The invention belongs to the technical field of solid-state lithium metal batteries. The invention provides a mixed ion / electron conductor intermediate layer with a directional double-layer structure. The mixed ion / electron conductor intermediate layer comprises a titanium nitride nanotube array and lithium ion conductor layers deposited on the inner surface and the upper surface of the titanium nitride nanotube array. The lithium ion conductor layer on the upper layer of the directional double-layer structure mixed ion / electron conductor intermediate layer has high lithium ion conductivity and low electron conductivity, and can inhibit nucleation of lithium on an electrolyte interface and growth of lithium dendrites; the lower layer can guide lithium to realize uniform deposition and stripping in the nanotubes through a creep mechanism, and stress is effectively released, so that the electrochemical performance of the battery is improved; the creep path of lithium deposition stripping can be shortened, and the diffusion and transmission capability of lithium ions can be remarkably enhanced by matching with a lithium ion conductor with a high lithium ion diffusion rate; the middle layer is thin and controllable in thickness, the overall energy density of the battery is hardly reduced, and the application prospect is good.

The invention discloses a single-phase earth fault line selection method based on double-layer parameter adaptive optimization, and the method comprises the following steps: collecting three-phase current corresponding to each feeder line of a target system after the single-phase earth fault of the target system occurs, and carrying out the calculation to obtain zero-sequence transient current; inputting the zero-sequence transient current into a self-adaptive optimization decomposition model for self-adaptive decomposition to obtain an intrinsic mode component of a corresponding feeder line; extracting transient characteristics based on the intrinsic mode component and constructing a transient characteristic matrix; and inputting the transient characteristic matrix into a pre-trained optimization mechanism fault line selection model, outputting a fault posterior probability corresponding to each feeder line, and determining a fault feeder line according to the fault probability. According to the invention, double-layer parameter adaptive optimization is used for carrying out joint optimization on key parameters of a decomposition model and key parameters of a line selection model, so that effective feature extraction and reliable discrimination can still be realized under the conditions of complex zero-sequence transient current high-frequency components and unclear features caused by the access of the distributed power supply; therefore, misjudgment and missed judgment are reduced, and the fault line selection accuracy and robustness are improved.

The invention discloses a method and device for determining an initial fault line combination of a power system considering cascading failure propagation, electronic equipment and a storage medium, and belongs to the technical field of power system fault recognition. The method comprises the following steps: constructing an attack and defense double-layer optimization model comprising an upper-layer attack model and a lower-layer defense model, wherein the upper-layer attack model aims at maximizing the load loss value, and the lower-layer defense model aims at minimizing the load loss value; the method comprises the following steps of: randomly generating a plurality of candidate fault line combinations containing a preset number of fault lines, respectively simulating a cascading fault propagation process caused by the candidate fault line combinations, obtaining a power grid working condition after a fault is ended, and calculating a load loss value of each candidate combination by utilizing a lower-layer defense model; and selecting the candidate fault line combination with the maximum load loss value as an initial fault line combination of the power system. By implementing the method, the problem that the initial fault line combination of the power system is not accurately determined in the prior art can be solved.

The application discloses a composite current collector based on a PP-based film / PET-based film and a production process, which comprises the following steps: S1, base film pretreatment; S2, physical modification treatment; S3, double-layer intermediate transition layer preparation; and S4, metal layer preparation. The physical modification constructs a micro-nano rough structure on the surface of the base film through plasma etching, removes impurities in a weak boundary layer, increases the contact area by 3-5 times, provides a basis for the mechanical occlusion of the transition layer and the metal layer, and introduces a small amount of oxygen-containing polar groups to preliminarily increase the surface energy; and the transition layer is a composite structure of a silane coupling agent and a Cr layer, is combined with the polar groups of the base film through Si-O-C covalent bonds, is connected with the coupling agent and the Cr layer through Cr-N coordination bonds, and is embedded into rough pits through Cr atoms to form a dual action of mechanical anchoring and chemical bridging, so that the peeling strength of the metal layer and the base film is greatly increased through the cooperation of the two, and the mechanical requirement of long-term cycling of a lithium battery is met.

A near-atomic-scale electrolytic machining method based on an interface self-assembly biomask comprises the steps that firstly, hydroxylation pretreatment is conducted on the surface of an anode of a workpiece, then the surface of the anode is covered with an organic solvent phase containing phospholipid monomers, water-phase electrolyte drops are introduced, molecular self-assembly driving force at an oil-water-metal three-phase interface is utilized, and the surface of the anode of the workpiece is subjected to near-atomic-scale electrochemical machining. And rapidly forming a layer of ultrathin, continuous and stable support phospholipid bilayer mask on the surface of the workpiece in situ. Then, biological nanochannels are embedded in the biomimetic mask to construct a confinement ion transport path. And finally, a precise pulse electric field is applied, electrolyte ions are driven to be strictly limited in the nanometer channel and transmitted to the surface of the workpiece, local anodic dissolution is triggered, and therefore localized material removal of the nanometer scale or even the near-atomic scale is achieved. According to the method, the technical bottleneck that the high-quality phospholipid bilayer is difficult to prepare on the high-surface-energy metal surface is solved, and a new way is provided for ultra-precision electrolytic machining.

A power semiconductor device is provided. The power semiconductor device mainly comprises a first conductive-type highly-doped substrate and a second conductive-type contact region formed thereon. The contact region has a dual-layer doping structure comprising a highly-doped region and a lightly-doped region. Accordingly, the active area of the power device has a five-layer structure of a second conductive-type highly-doped region, a second conductive-type lightly-doped region, an intrinsic semiconductor epitaxial layer, a first conductive-type lightly-doped layer, and a first conductive-type highly-doped substrate, for improving the breakdown voltage of the power device. In addition, metal silicide layers are introduced on the front and back sides of the device and form ohmic contacts with the metal layers thereof to shorten the reverse recovery time (trr) of the device. The metal electrode on the front of the device has a plurality of ring-shaped designs, including at least one second conductive-type metal ring and one first conductive-type metal ring.

This application relates to a silicon-carbon composite anode material, its preparation method, and its application. The silicon-carbon composite anode material has a core-shell structure, comprising, from the inside out: a core, which is a silicon-carbon composite matrix; an intermediate shell, which is a rigid tungsten nitride layer covering the outer surface of the silicon-carbon composite matrix; and an outer shell, which is a flexible conductive carbon layer covering the outer surface of the intermediate shell. This application proposes using tungsten nitride (W2N) as the inner rigid coating material to form a high-strength, conductive W2N protective layer on the surface of the silicon-carbon composite material, and further coating it with a flexible conductive carbon layer, constructing a "hard shell-soft layer" dual-layer synergistic protection structure, thereby systematically alleviating the key technical challenges of the aforementioned silicon-based anodes.

The application relates to the field of electronic component manufacturing, in particular to a forming process of an inductor coil, which comprises the following steps: step one: using a first bending jig to preliminarily bend the end part of a double-layer coil; step two: using a second bending jig to further bend the preliminarily bent end part of the coil to reach a preset bending shape; and step three: using a detection and correction jig to correct the bent end part of the coil to ensure that the shape meets the forming requirements. The application solves the problems that in the prior art, the bending shape and size of the end part of the inductor coil are difficult to accurately control, the electromagnetic performance and connection stability are affected, and the lack of effective detection means leads to high product failure rate and increased production cost.

The invention discloses a double-layer powder material servo prepressing forming device and method, and belongs to the technical field of powder metallurgy forming. A set of built-in servo driving mechanism is additionally arranged on a traditional forming upper punching mechanism, a set of movable pre-pressing upper punching mechanism is additionally arranged, after first-time powder filling is completed, the forming upper punching mechanism stops at the first position, at the moment, the pre-pressing upper punching mechanism conveys a pre-pressing upper punch to the upper side of a die cavity, and through control of a servo motor, the forming upper punching mechanism stops at the first position; the driving rod moves downwards to make contact with the pre-pressing upper punching mechanism, the pre-pressing upper punching head is pressed into the die cavity, the needed interlayer interface shape is pressed, then the driving rod and the pre-pressing upper punching head retreat, secondary powder filling is conducted, and the forming upper punching head enters the die cavity to conduct final forming pressing. Step-by-step powder filling and step-by-step pressing are achieved in one working cycle of the forming upper punching mechanism, the requirement that the interlayer interface shape of a final product can be set is met, operation is easy and convenient, the application range is wide, and the method can be popularized to various powder metallurgy devices.

This application provides a copolymer membrane, its preparation method, and its application. The copolymer membrane is a hydrophilic-hydrophobic or hydrophilic-hydrophobic-hydrophilic bilayer structure, wherein the hydrophobic ends are cross-linked by unsaturated bonds. This application uses thermal cross-linking to cross-link the hydrophobic ends of the bilayer structure through unsaturated bonds. This method improves membrane stability; it also immobilizes nanoporins within the membrane, increasing the bonding strength between the pores and the membrane and reducing the risk of nanoporin detachment; furthermore, it significantly reduces the need for light-transmitting materials for UV cross-linking, lowering costs; and it avoids the adverse effects of free radicals generated by chemical cross-linking on the porous proteins.

The application discloses a preparation method of a PPSU-based ZIF-8 double-layer membrane and application of the double-layer membrane in hydrogen separation, and belongs to the technical field of gas separation membranes. The preparation method is as follows: ZIF-8 seeds are embedded in a PPSU matrix solution, then are spin-coated onto the surface of an alpha-Al2O3 carrier to obtain a PPSU-based membrane, and secondary growth of the membrane is carried out through a solvothermal reaction, so that the seeds grow epitaxially, a continuous, dense and defect-free ZIF-8 separation layer is formed on the surface and the near-surface region of the carrier substrate, and the reaction is ended to obtain the double-layer membrane. Through the seed embedding strategy, the interface bonding force between the ZIF-8 layer and the PPSU substrate is significantly enhanced, and the generation of interface defects is effectively inhibited. The double-layer membrane has high permeation flux and high separation selectivity for a H2 / CO2 system, and is particularly suitable for hydrogen separation and purification processes.

The invention discloses a silk-screen anti-fading sheet metal part, and belongs to the technical field of sheet metal part processing and surface treatment. Comprising a metal plate, a reinforcing mechanism, a silk-screen pattern layer and a protection mechanism, the reinforcing mechanism, the silk-screen pattern layer and the protection mechanism are sequentially arranged from bottom to top, the reinforcing mechanism comprises a pretreatment layer coated on the metal plate and a circular-truncated-cone-shaped anchoring protrusion on the surface, the anchoring protrusion is filled and wrapped with the silk-screen pattern layer to form mechanical occlusion, and the protection mechanism is composed of an inner protection layer and an outer protection layer. Hemispherical micro-protrusions are arranged on the surface of the outer protective layer, and the edges of the silk-screen layer and the protective layer are distributed in a step shape and wrapped by a sealing layer. Through the double-layer protection structure and the stepped sealing design, the problems that silk-screen patterns are prone to fading and aging and edge water seepage is caused are solved, the embedded woven mesh enhances the rigidity of the base material, coating cracking caused by deformation is prevented, the visual stability of the sheet metal part in the severe environment is remarkably improved, and the service life of the sheet metal part in the severe environment is remarkably prolonged.

The present application relates to the field of micro-reactor, and discloses a double-layer composite micro-reaction channel plate with three-dimensional stepped channels and a micro-channel reactor.The double-layer composite micro-reaction channel plate comprises an upper channel plate and a lower channel plate which are superimposed;the top surface of the upper channel plate is provided with heat exchange channels A, and the bottom surface is provided with a first fluid inlet;the first fluid pre-heat exchange channel;the second fluid inlet;the second fluid pre-heat exchange channel;the mixing channel;and the mixed fluid outlet.A plurality of stepped cavities A are staggered along the flow direction at the bottom of the mixing channel.The bottom surface of the lower channel plate is provided with heat exchange channels B, and the top surface is provided with stepped cavities B which correspond to the positions and sizes of the stepped cavities A one by one.The double-layer composite micro-reaction channel plate of the present application is provided with special three-dimensional stepped channels, and the mixed fluid will produce fluctuation when passing through the structure, which can greatly enhance the disturbance of the fluid under the premise of not increasing the fluid resistance, so that the advection becomes turbulent flow, and the mixing effect is significantly enhanced.

The utility model relates to the technical field of mechanical manufacturing, and discloses a wire cutting device convenient for vertical calibration, which comprises a machine body, a cutting arm and a cutting head, an electrode wire is arranged at the bottom of the cutting head, a vertical component is integrated on the side of the cutting head, and a rotating arm and the cutting arm are magnetically attached or vertically unfolded to switch working states. The vertical assembly comprises a double-layer annular piece and an adjusting bolt, the double-layer annular piece allows the electrode wire to pass through a fan-shaped opening, and the second sliding piece slides along the annular piece and is matched with the threaded adjusting bolt to achieve electrode wire perpendicularity detection. In the calibration process, when the rotating arm is perpendicular to the machine body, the axis of the double-layer annular piece and the cutting shaft are collinear, and perpendicularity is judged by adjusting spark consistency of a bolt end detection round head and an electrode wire. By means of the integrated calibration structure, the problems that a traditional device depends on an external calibration block and is prone to being interfered by the levelness of a workpiece are solved, the calibration efficiency and precision are remarkably improved, and the device is suitable for high-precision linear cutting machining scenes.

Metallization interconnect structures, integrated circuit devices, and methods related to high aspect ratio interconnects are discussed. A self assembled monolayer is selectively formed on interlayer dielectric sidewalls of an opening that exposes an underlying metallization structure. A first metal is formed on the underlying metallization structure and within only a bottom portion of the self assembled monolayer. The exposed portion of the self assembled monolayer is removed and a second metal is formed over the first metal.

The invention relates to the technical field of contact materials for high-voltage electrical equipment, and particularly discloses a contact material, a preparation method and a contact state monitoring method. The contact material includes a base material; the surface of the substrate material is combined with a porous HEAs framework, and the porous HEAs framework is provided with through holes perpendicular to the substrate material; the through holes are filled with phase change alloy, and the melting point of the phase change alloy is smaller than or equal to 200 DEG C. An integrated double-layer structure is adopted, a substrate material with excellent static electrical performance is combined with a porous HEAs framework-phase change alloy composite surface layer with dynamic response characteristics and self-adjusting performance, the contact material is endowed with the electric arc energy active dissipation, erosion self-inhibition and surface self-repairing capacity, and through doping modification of rare earth elements, the contact material can be subjected to surface self-repairing, so that the service life of the contact material is prolonged, and the service life of the contact material is prolonged. Consumption monitoring of the contact material in the working state is achieved, and the technical bottleneck that an existing contact material lacks active protection, self-adaptive repairing and state monitoring is solved.

This utility model relates to the field of permeable pipe technology and discloses an anti-clogging permeable pipe, comprising a permeable pipe body: both ends of the permeable pipe body are equipped with mounting rings, a fine filter layer is sleeved on the outer surface of the permeable pipe body, both ends of the fine filter layer are fixed to the mounting rings, a coarse filter layer is sleeved on the outer surface of the mounting rings, both ends of the coarse filter layer are fixed to the mounting rings, and the fine filter layer is made of polypropylene filter mesh. This anti-clogging permeable pipe, by combining the polypropylene filter mesh and non-woven geotextile into a double-layer filtration structure, can fully utilize the synergistic advantages of the two materials, significantly improving the overall protective performance of the permeable pipe. This clearly defined layered filtration design avoids rapid clogging caused by excessively fine single materials and solves the problem of insufficient interception of fine particles by a single coarse filter material. In addition, the double-layer structure can buffer soil stress, adapt to foundation deformation, and extend the service life of the permeable pipe.

The invention discloses an ion channel protein near-atomic scale confinement dissolution electrochemical machining method based on a bionic confinement interface. The method is characterized in that a bionic phospholipid bilayer mask is spread on a workpiece anode to shield a non-processing area, ion channel protein is embedded into the bionic phospholipid bilayer mask to serve as an electrolyte channel, and when the bionic phospholipid bilayer mask is powered on, the anode dissolution reaction is strictly limited in the ion channel protein channel. Millivolt-level picosecond-nanosecond pulse voltage or current is adopted on the time scale so that anode metal atoms can be removed one by one, electrolytic products are discharged in the modes of electrolyte adjustment, microcosmic acting force, micro vibration and the like so as to ensure sustainable generation of electrochemical reaction, and therefore near-atomic-scale electrolytic machining is achieved. The electrochemical machining technology and the biological field are fused in an interdisciplinary mode, the near-atomic-scale electrochemical dissolution reaction space is constructed, the capacity of electrochemical machining for removing materials in an ion form is approached, and near-atomic-scale electrochemical machining is achieved.

The utility model relates to the technical field of vulcanizing devices, in particular to a golf ball double-layer ball core vulcanizing device which comprises a base, symmetrical vertical plates are arranged above the base, a vulcanizing box is rotatably arranged between the two vertical plates, vulcanizing bins are evenly distributed in the vulcanizing box, the vulcanizing bins are all spherical, and the vulcanizing boxes are arranged on the base. A heating resistance wire is arranged at the position, located on the side edge of the vulcanizing bin, of the vulcanizing box, connecting openings are formed in the two sides, close to the vertical plate, of the vulcanizing box, a connecting plate is arranged on the side, close to the vulcanizing box, of the vertical plate, the connecting plate is arranged in the connecting openings, and the size of the connecting plate is matched with that of the connecting openings. The double-layer ball core of the golf ball can be driven to roll, collide and vulcanize, so that double-layer materials continuously relatively move and are extruded in the vulcanizing process, the double-layer materials can be better combined, the stability and integrity of the ball core structure are improved, and the vulcanizing uniformity and efficiency of the ball core are also improved.

The application discloses a thermoelectric pile structure for calibrating a far ultraviolet ultraviolet detector based on MEMS, which comprises a silicon substrate, a support layer, an absorption layer, a thermocouple pair, aluminum wires, aluminum electrodes and a single crystal silicon material structure on the silicon substrate. The double-layer thermocouple stacking structure is adopted to improve the device duty ratio, more thermocouple pairs can be laid in the case of keeping the size of the one-layer structure unchanged, and the response rate of the detector is improved. The circular structure conforms to the distribution trend that the temperature is radially diffused from the center of the absorption layer to the periphery in a decreasing manner, the hot end of the thermocouple pair can be closer to the area with higher temperature, the temperature of the hot end of the thermocouple pair is more uniform, and the response rate of the detector is improved. The radiant energy of the far ultraviolet ultraviolet radiation source is converted into an output thermoelectric electromotive force, a mathematical model of Fourier's law and the Seebeck effect is established for calculation, and the heat flux density of the far ultraviolet ultraviolet radiation source is measured.

The invention discloses a full-wave-band high-reflectivity metal composite film structure and a preparation method thereof, and relates to the technical field of semiconductor light-emitting elements. The metal composite film structure is applied to a light-emitting element, light enters from one side of an adhesion layer of the metal composite film structure, and the metal composite film structure at least comprises the adhesion layer with the thickness ranging from 0.5 nm to 2.5 nm; the composite reflecting layer is arranged on the adhesion layer, and the composite reflecting layer is of a stacked structure of a silver layer and an aluminum layer, or is a silver-aluminum alloy layer. The invention further discloses a preparation method of the structure, a vacuum electron beam evaporation process is adopted, when the composite reflecting layer is deposited, the evaporation rate is controlled to be 1-15 angstroms per second, and cavity heating at the temperature of 40-70 DEG C is supplemented. The invention preferably also comprises a double-layer protection structure consisting of atomic layer deposited aluminum oxide and chemical vapor deposited silicon dioxide. According to the invention, the problems of low reflectivity, narrow wave band, contradiction between adhesive force and reflectivity, high-cost sputtering process damage and the like of a traditional reflector are solved, and the advantages of full-wave band high reflectivity, high adhesive force, high reliability, low cost and low damage preparation are realized.

The invention provides a method for preparing a silicon-carbon negative electrode material by using a waste photovoltaic module, which comprises the following steps of: (1) disassembling and crushing to obtain silicon / silver / aluminum / EVA (Ethylene Vinyl Acetate) mixed powder; (2) carrying out alkali etching to obtain etched silicon / silver / EVA (Ethylene Vinyl Acetate) powder; (3) synergistic carbonization coating: constructing a double-layer carbon coating structure of'inner layer hard carbon-outer layer soft carbon 'on the surface of the silicon particles in situ to obtain a silicon-carbon composite material; (4) carrying out heat-moisture treatment, so that the catalytic active component is stably anchored on the surface of the material, and the transition metal salt is decomposed into metal oxide to obtain a graphite / silicon carbon material; and (5) performing in-situ catalytic growth of a carbon nanotube on the graphite / silicon carbon material to obtain the silicon carbon negative electrode material with a porous silicon-carbon tube-double carbon layer three-dimensional conductive network structure. The silicon-carbon negative electrode material obtained by the invention has high specific capacity, excellent cycle stability and rate capability.

The invention discloses an electrode material which is simple in preparation method, high in performance and capable of stably producing hydrogen by electrolyzing water, and also discloses a preparation method of a photocatalyst for purifying wastewater by using a derivative of the electrode material. The preparation method of the electrocatalyst mainly comprises the following steps: etching a nickel metal substrate by using diluted hydrochloric acid; the preparation method comprises the following steps: preparing a first-stage product, dissolving the first-stage product with a bismuth source and molybdate in a reaction kettle, carrying out hydrothermal synthesis to obtain a hydrothermal product, carrying out high-temperature calcination on the obtained material to obtain a sample precursor and a part of byproducts, finally repeating the reaction once to obtain a high-activity electrode and related byproduct derivatives, mixing the two byproducts, carrying out high-temperature calcination, and grinding to obtain a second-stage product. According to the prepared catalyst, a bismuth source is introduced to serve as an additive, a NiMoO4 / Fe2 (MoO4) 3 composite film layer active phase is constructed on an NF substrate through a one-step hydrothermal-corrosion-growth method, the active phase and an NF framework are induced through a confinement effect to form strong interface bonding, the electron transfer rate is increased, and the electrode performance is remarkably improved by reducing the valence band position of the active phase. The preparation process is simple to operate, the morphology of the catalyst is controllable, and derived by-products generate higher economic benefits.

The utility model relates to the technical field of medical disinfection equipment, in particular to a plasma electric field generator with a double-layer protection function, which comprises a reaction cavity frame, four preformed holes which are vertically symmetrical are formed in the left part and the right part of the reaction cavity frame and are used for circuit connection, and 11 dust collection plates are connected between the front part and the rear part of the reaction cavity frame. 10 groups of corona electrodes which are symmetrical up and down are connected between the front part and the rear part of the reaction cavity frame, each group comprises two pieces, and the corona electrodes on the upper layer and the lower layer are arranged at equal intervals. The utility model provides a gradient double-layer protection structure, through differentiated material combination and space reconstruction, while the compactness of equipment is maintained, the insulation effect of a ceramic insulator is realized, the phenomena of current leakage and short circuit are effectively prevented, a physical isolation space reserved between layers can effectively block a breakdown arc diffusion path, and the service life of the equipment is prolonged. In addition, the shell forms final safety redundancy, and continuous and safe operation of equipment is ensured.

An exemplary embodiment of the present disclosure provides a membrane including a supporting base layer, which can be permeable, and a dual layer oxygen barrier film disposable over the supporting base layer. The supporting barrier film can include a polymeric or paper-based material. The dual layer oxygen barrier film can include a chitin material and a cellulosic material. The cellulosic material of the dual layer oxygen barrier film can be the same material as the permeable membrane or can be any other cellulosic material.

This invention discloses a method for removing a double-layer positive photoresist for preparing metal bumps: S1, cleaning the epitaxial wafer; S2, spin-coating a first-type positive photoresist as the bottom layer onto the epitaxial wafer; S3, soft baking to cure the first-type positive photoresist; S4, spin-coating a second-type positive photoresist as the top layer onto the first-type positive photoresist; S5, soft baking to cure the second-type positive photoresist; S6, exposure using a photolithography machine to expose the double-layer photoresist; S7, post-baking; S8, development using an alkaline developer to develop the double-layer photoresist; S9, metal deposition using a metal deposition apparatus; S10, removing the double-layer photoresist using a photoresist stripping solution; S11, preparing metal bumps on the surface of the epitaxial wafer. This invention achieves a lift-off process using a double-layer positive photoresist, solving the problem of difficult preparation of small-sized metal bumps in Micro-LED micro-display devices, and enabling the preparation of metal bumps with small spacing and high thickness.