785 results about "Acid etching" patented technology

The invention discloses a porous titanium-based implant with a photo-thermal surface and a preparation method and application of the porous titanium-based implant, and belongs to the technical field of biomedical materials. The preparation method comprises the steps that a porous titanium substrate is prepared through 3D printing, then flowing acid etching treatment and anodic oxidation treatment are conducted in sequence, then the porous titanium substrate is placed in photo-thermal coating dispersion liquid for reaction, cleaning and drying are conducted, and the porous titanium-based implant with the photo-thermal surface is obtained. The photo-thermal coating dispersion liquid is obtained by dispersing MXene-ZnO composite particles in a dopamine hydrochloride solution. The porous titanium-based implant provided by the invention can be rapidly heated to a proper temperature under the irradiation of near-infrared light, and has good antibacterial, anti-tumor and osteogenesis promoting properties and biocompatibility.

The invention provides a silicon wafer and a preparation method thereof, and a solar cell and a preparation method thereof. The silicon wafer is provided with a first surface and a second surface which are opposite, the first surface is provided with a suede structure, and at least one part of the second surface is provided with an irregular hill-shaped structure. The preparation method of the silicon wafer comprises the following steps that acid etching is carried out on the first surface of the silicon wafer to be textured, then alkali texturing is carried out, so that a textured structure is formed on the first surface, and the textured structure can comprise a plurality of pyramid units; and immersing the silicon wafer subjected to alkali texturing into an alkali solution containing an organic polymer additive (such as polyoxyethylene), and finely adjusting the textured structure of the silicon wafer through etching of the alkali solution containing the organic polymer additive so as to form at least one concave part with a light trapping effect on at least one tower surface of the pyramid unit. The silicon wafer and the solar cell not only have excellent light trapping performance, but also do not affect the subsequent passivation effect, thereby effectively improving the current and efficiency of the solar cell.

The invention discloses a hydrogen evolution electrode for an AEM electrolytic cell cathode and a preparation method thereof, the electrode sequentially comprises a substrate net, a metal bottom layer and a catalyst layer, the substrate net is selected from a stainless steel net or a nickel net, the metal bottom layer is formed on the substrate net through physical vapor deposition, and the material is selected from Ni, Ti, alloys thereof or oxides thereof; the catalytic layer is deposited on the metal bottom layer through physical vapor deposition and sequentially comprises a catalytic bottom layer, a catalytic middle layer and a catalytic outer layer, and the porosity is gradually increased. The preparation method comprises the following steps: roughening the acid etching surface of a substrate net, forming a metal bottom layer on the substrate net through physical vapor deposition, sequentially forming a catalytic bottom layer, a catalytic middle layer and a catalytic outer layer on the surface of the metal bottom layer through physical vapor deposition to obtain a catalytic layer, and performing post-treatment on the catalytic layer through plasmas doped with elements to form a porous network structure. And the corrosion resistance and the catalytic effect of the AEM electrolytic cell cathode in an alkaline environment are greatly improved.

The invention belongs to the technical field of biomedical engineering, and particularly relates to a preparation method and application of a titanium dental implant surface coating, and the preparation method comprises the following steps: S1, pretreatment of a titanium dental implant matrix: sequentially carrying out grinding and polishing, ultrasonic cleaning and acid etching treatment; s2, preparation of a coating precursor solution: adding nano-hydroxyapatite powder, chitosan, gelatin and titanium dioxide nanoparticles into deionized water, stirring to form a suspension, then adding a silver nitrate solution, and continuously stirring to form the coating precursor solution; s3, coating a coating: coating the surface of the pretreated titanium dental implant matrix with the coating precursor solution by adopting an electrophoretic deposition method; and S4, drying and sintering: drying and sintering the coated titanium dental implant. According to the preparation method of the titanium dental implant surface coating, provided by the invention, the bonding strength between the coating and the titanium dental implant matrix can be improved.

The invention provides an alkaline ion battery negative electrode material as well as a preparation method and application thereof, and particularly relates to an MXene / MoS2 / TiO2 composite material which is prepared by the following steps: etching an MAX phase by using mixed acid containing HF to obtain MXene; performing freeze drying to obtain powder containing MXene, a Mo source and an S source; and calcining to obtain the composite material. According to the negative electrode material disclosed by the invention, MoS2 is supported by utilizing high conductivity of MXene and structural collapse of the MoS2 is relieved, and TiO2 enhances cycle stability, is designed for a negative electrode of an alkaline ion battery and shows good cycle performance. MXene is obtained by etching an MAX phase with mixed acid, the composite material is prepared by combining freeze drying and calcination, NH prevents MXene from stacking and expands interlayer spacing, MoS2 is formed after calcination, and a small amount of TiO2 is generated in situ. And the single-layer MXene is used as a binder to replace a traditional material, so that the electrochemical performance of the composite electrode is improved.

The invention discloses an oil-water well acidification continuous construction electric control system based on multi-parameter monitoring, and relates to the technical field related to acidification control in oil-gas field development, and the system comprises a multi-source data fusion monitoring module which integrates wellhead pressure, temperature, flow, pH value, H2S concentration and acid liquid conductivity, and an underground microwave imaging sensor carries out multi-physical quantity collection; a multi-objective optimization controller is designed, and the acid etching depth, the crack flow conductivity and the construction cost are balanced; the self-adaptive construction control module is based on a variable-frequency and variable-speed acid pump system controlled by a fuzzy sliding mode and is used for realizing stepless regulation of displacement; an intelligent shunting system is arranged, and acid liquor distribution is dynamically adjusted according to the suction volume of each layer section. According to the variable-frequency acid pump system based on fuzzy sliding mode control, stepless adjustment of the displacement is achieved; the intelligent flow distribution system dynamically prepares liquid according to the suction volume of each layer section; and through a three-stage safety interlocking mechanism, power can be cut off and emergency acid discharge can be started within 0.5 second when the temperature rise is greater than or the pressure suddenly changes, so that the well control risk is reduced.

The invention discloses a preparation method of a solar cell and the solar cell. The preparation method comprises the following steps: removing a second mask layer on a first surface and a side surface of a silicon substrate by adopting a chained acid etching process; removing the second tunneling passivation structures on the first surface and the side surface of the silicon substrate by adopting a chained alkali etching process; and removing the second tunneling passivation structures in the first region and the third region of the second surface of the silicon substrate by adopting a groove type etching process, and forming a suede light trapping structure on the third region of the second surface of the silicon substrate and the first surface, and removing the first mask layer in the first area and the second mask layer in the second area on the second surface of the silicon substrate. According to the preparation method of the solar cell and the solar cell, the cell preparation process can be optimized, the environment is protected, the texture surface quality is improved, and the cell efficiency is improved.

The invention relates to the technical field of lithium ion battery negative electrode materials, and discloses a preparation method and application of a high-efficiency silicon-carbon composite graphite material, and the preparation method comprises the following steps: S1, carrying out porosity and size regulation and control on silicon particles: carrying out ball milling on industrial-grade silicon powder to obtain nano silicon particles, and carrying out acid etching to form a porous structure; s2, functional surface treatment and interface optimization: introducing functional molecules to the surfaces of the silicon particles and coating a layer of ultrathin SiO2 protective film; and S3, carbon coating and flexible protection layer construction: performing pyrolysis on the porous silicon particles by using a carbon source to form a uniform carbon coating layer which is applied to a lithium ion battery negative electrode material, and the lithium ion battery is used for an electric vehicle, a power grid energy storage system and portable electronic equipment. Through the collaborative design of the flexible protection layer, the double-layer carbon coating and the gradient coating, the technical bottlenecks of the silicon-based negative electrode material in the aspects of long cycle stability, high rate performance and interface chemical stability are systematically solved.

The invention relates to the technical field of hydrogen energy, and provides a vanadium oxide catalytic magnesium-based hydrogen storage material based on alkali metal enhancement and a preparation method. The material is prepared from spherical MgH2 powder and lamellar XV6O15 (at) C powder through a high-energy ball milling method, wherein X is one of alkali metals Li, Na and K. The material has a nanoscale composite structure, and the hydrogen storage performance can be remarkably improved. The preparation method comprises the following steps: 1) preparing XV6O15 (at) C nano powder through acid etching, alkali metal modification and heat treatment; and 2) mixing the powder with MgH2 in a protective atmosphere, and preparing the composite material by adopting high-energy ball milling. Results show that the catalyst improves the hydrogen absorption and desorption rate of MgH2, the hydrogen storage temperature is reduced to 50 DEG C for hydrogen absorption, and the hydrogen is rapidly desorbed at 200-225 DEG C. The hydrogen storage dynamics and temperature performance are remarkably optimized, an effective strategy is provided for design and application of a novel magnesium-based composite hydrogen storage material, and the method is suitable for hydrogen energy industrial application.

The invention discloses a material for removing organic pollutants in water, a preparation method of the material and a method for treating water. The water treatment material is prepared by organically combining a precursor and an active catalytic component and optimizing and modifying the precursor and the active catalytic component, the preparation method comprises the following steps: pretreating a precursor metal organic framework, etching surface active sites by acid, doping sulfur to improve charge / spin redistribution of a carbon skeleton to regulate and control a coordination environment, and optimizing a material structure by optimizing a coordination structure and material morphology of the treated precursor through thermal derivation. The prepared material is cross-linked and doped to construct an active filter membrane; the method for treating water comprises the steps of heterogeneous activation persulfate water treatment as a catalyst, and coupling filtration and persulfate oxidation as a catalytic filter membrane for water treatment. The material for removing the organic pollutants in the water and the method for treating the water, disclosed by the invention, are excellent in performance and efficient in treatment, integrate various effects of adsorption, catalysis, membrane filtration and the like, and are suitable for water purification treatment.

The invention discloses a modified LaMnO3 perovskite oxide catalyst as well as a preparation method and application thereof, and belongs to the field of catalyst modification. The preparation method of the modified LaMnO3 perovskite oxide catalyst comprises the following steps: (1) preparing the LaMnO3 perovskite oxide; and (2) carrying out acid etching treatment and heat treatment on the LaMnO3 perovskite oxide, and obtaining the LaMnO3 perovskite oxide after the acid etching treatment and the heat treatment are finished. According to the method, perovskite oxide is modified in an etching mode, the LaMnO3 perovskite oxide catalyst with high catalytic activity and high stability is synthesized by adding a heat treatment process, the LaMnO3 perovskite oxide catalyst is used in the process of preparing benzoic acid through methylbenzene solvent-free oxidation, no chlorine element is introduced, and the prepared high-quality benzoic acid can be widely applied to medical treatment and food. When the catalyst is used in a reaction for preparing benzoic acid through selective oxidation of toluene, the conversion rate of toluene can reach 24.8%, the selectivity of benzoic acid can reach 82.7%, and the catalyst has good activity and selectivity.

The invention discloses an aluminum-based circuit acidic etching solution, which relates to the technical field of etching, and comprises the following components by mass concentration: 30-60 g / L of composite inorganic acid, 10-20 g / L of a wetting agent, 5-15 g / L of a stabilizer, 5-15 g / L of an accelerator, 6-15 g / L of a brightener, 0.5-2.5 g / L of a composite anti-lateral corrosion agent, and 2-4 g / L of a complexing agent. According to the acid etching solution for the aluminum-based circuit, the lateral etching rate of a 50-75-micron thin circuit can be lower than 30%, the etching rate is stable, the etched appearance is bright and uniform, and the circuit does not have a burr phenomenon; the wetting agent is added, so that the etching uniformity can be improved, the burr phenomenon can be prevented, the adsorption rate of inorganic acid can be increased for the burr part which is difficult to treat, and the corrosion efficiency of the burr part can be improved; by adding the brightener, the phenomena of uneven partial etching and blackening of the surface after etching can be solved.

The invention relates to a preparation method of a local ITO interconnected perovskite-TOPCon laminated cell, which comprises the following steps: taking an n-type monocrystalline silicon wafer as a substrate, cleaning and texturing, diffusing boron on the back to form a P + emitter, oxidizing at high temperature, and treating the surface through acid etching and alkali polishing; sequentially preparing a tunneling oxide layer and a phosphorus-doped polycrystalline silicon layer on the front surface, annealing and crystallizing, depositing an aluminum oxide film and a multi-layer silicon nitride film on the back surface after cleaning, and depositing a single-layer silicon nitride film on the front surface; preparing a back metal electrode, etching according to a designed pattern to remove a local silicon nitride film on the front surface, sequentially preparing an ITO interconnection layer, a hole transport layer, a perovskite layer, a passivation layer, an electron transport layer and an ITO transparent conductive layer on the front surface, and finally preparing a front metal electrode and solidifying to form a contact electrode. According to the invention, the problems of back corrosion risk, effective area loss and tedious process in the existing method are solved, full-size manufacturing is realized, the cell performance is improved, and industrialization is easier.

The invention discloses a covalent functionalized MXene artificial synapse and a preparation method thereof, relates to the technical field of artificial intelligence, and aims at solving the problems of how to enrich the overall characteristics of cranial nerve-like chips and promote the artificial intelligence technology. The preparation method comprises the following steps: selecting a substrate; performing patterning treatment on the grid electrode, the source electrode and the drain electrode on the substrate by utilizing a photoetching process, and performing electron beam evaporation to deposit a metal layer and performing stripping to obtain a metal electrode pattern; carrying out patterning processing on the channel region on the substrate by utilizing a photoetching process; the MAX phase material is subjected to in-situ acid etching in combination with mechanical stripping to obtain a few layers of T < 3 > C < 2 > TX MXene; forming a uniform T < 3 > C < 2 > TX MXene film on the substrate through a coating process, and obtaining a channel region pattern through stripping; preparing an iodonium salt solution, and immersing the prepared device into the iodonium salt solution to complete covalent functionalization; and preparing an electrolyte solution, and dripping and casting electrolyte on the Ti3C2TX MXene channel layer, the grid electrode and the exposed substrate.

The utility model provides an acid etching liquid recycling device which comprises a circulating box, an inner cavity is formed in the circulating box, a partition plate is fixedly connected to the middle end of the bottom of the inner cavity, a cleaning mechanism is arranged on the front side of the circulating box, and a dismounting mechanism is arranged on the left side of the inner cavity. An impurity filtering layer is arranged on the left side of the inner cavity through a dismounting mechanism, a degerming layer is fixedly connected to the lower portion of the dismounting mechanism, a guiding layer is fixedly connected to the lower portion of the degerming layer, an infusion pump is fixedly connected to the position, located on the left side of the partition plate, of the bottom of the inner cavity, and the input end of the infusion pump communicates with an input pipe; by arranging the cleaning mechanism, the top of the impurity filtering layer can be scraped and swept, large particles remaining on the top of the impurity filtering layer are pushed to the top of the connecting plate and fall into the inner side of the macromolecule dialysis layer through the leakage groove, and the situation that the filtering effect of the impurity filtering layer is affected due to excessive accumulation of the large particles is avoided.

The invention discloses an antifouling agent, a micro-nano mesoporous material and a marine antifouling composition. A preparation method of the micro-nano mesoporous material comprises the following steps: S1, sequentially carrying out hydrothermal acid etching, cleaning, roasting and cooling on a micro-nano mesoporous material matrix for later use; s2, dissolving a DCOIT-like derivative and halogenated fatty alcohol in a solvent, heating and refluxing, dropwise adding a mixed solution of diisocyanate and a catalyst, and continuously carrying out heat preservation reaction; and S3, grinding and bulking the micro-nano mesoporous material modified matrix prepared in the step S1 to fully release agglomerated fiber bundles, ultrasonically dispersing the fiber bundles in a solvent, adding the dispersed fiber bundles into a system in the step S2, carrying out a heating reaction, purifying, drying, grinding, and storing. Activated silicon hydroxyl enriched in a micro-nano mesoporous material modified matrix is covalently linked with degradable terminal isocyanate (R-NCO) in quaternized DCOIT derivatives, and the method has the properties of high efficiency, broad spectrum, low toxicity and long-acting effect.

The invention provides unequal-thickness ultrathin glass and a preparation method thereof. The preparation method comprises the following steps: (1) pasting a mask on the surface of UTG glass to obtain film-pasted glass; (2) firstly punching a row of laser holes at the center line of the bending area of the film-coated glass by using laser, recording the laser holes as a first row of laser holes, and then coating the bending area with fluoride as a coating material; then laser drilling is symmetrically conducted on the left side and the right side of the first row of laser holes in the direction from the center line of the bending area to the two sides, coating treatment is repeated once every time symmetric laser drilling is completed till the bending area is full of the laser holes, and the coated glass is obtained; (3) carrying out indirect acid etching on the bending area on the front surface of the coated glass by adopting hydrochloric acid to form an arc-shaped thinned surface so as to obtain roughly etched glass; and (4) carrying out polishing treatment on the rough etching glass to obtain the unequal-thickness ultra-thin glass. The method provided by the invention can significantly improve the flexibility and bending characteristics of the unequal-thickness ultrathin glass.

The invention relates to the technical field of pressure-sensitive adhesives, in particular to a preparation method of a UV (ultraviolet) viscosity-reducing adhesive tape, which comprises the following steps: taking 100g of polymer, adding 10-80g of ethyl acetate, an isocyanate curing agent and a photoinitiator, then uniformly stirring, standing and defoaming to obtain an adhesive, uniformly coating a PET (polyethylene terephthalate) release film with the standing adhesive, putting into a drying oven to bake and dry, then attaching to a PO (polyolefin) base film, and drying to obtain the UV viscosity-reducing adhesive tape. And putting the adhesive tape process product into an aging room, and placing the adhesive tape process product at normal temperature for 7 days to obtain the UV viscosity-reducing adhesive tape of the PO base material. The UV viscosity-reducing adhesive tape disclosed by the invention can realize the performance that a common UV viscosity-reducing adhesive tape cannot be balanced in a severe environment, has the general characteristics of high adhesive force at an initial stage and extremely low adhesive force after UV treatment in the aspect of performance, can resist strong acid corrosion before UV treatment, can be applied to acid etching protection of glass, can be subjected to viscosity-reducing stripping through UV irradiation after an etching process is completed, and is low in adhesive force and high in adhesive force. And automatic operation is easy, and no adhesive residue risk exists.

The invention belongs to the technical field of electrochemistry, and provides a monatomic iridium-based alloy cluster catalyst and a preparation method and electrocatalysis application thereof, and the preparation method comprises the following steps: low-pressure gas-phase capillary filling: mixing an iridium organic metal precursor, a dopant metal organic precursor, a microporous carrier material and a solvent, and drying to obtain mixed powder, the mixed powder is placed in an ampoule bottle with a certain vacuum degree and sealed, then the ampoule bottle is placed in a rotary drying oven for high-temperature heat treatment, and powder a is obtained; temperature-controlled acid etching: mixing the powder a and an acid solution for reaction in the environment of protective gas to obtain black powder; the black powder is placed in H2 / Ar mixed gas for programmed heat treatment, and the monatomic iridium-based alloy cluster catalyst is obtained. The monatomic iridium-based alloy cluster catalyst prepared by the method provided by the invention shows mass activity and catalytic durability which are obviously superior to those of commercial platinum carbon in alkaline hydroxide catalysis, and has a practical application prospect.

The invention provides pervious concrete prepared from modified recycled aggregate and a nano-reinforced material, and relates to the technical field of building materials, the pervious concrete comprises recycled aggregate, a nano-reinforced material, a cement matrix, a water reducing agent, a surfactant and water, the recycled aggregate comprises waste concrete, tile waste, ceramic fragments and glass waste, and the nano-reinforced material comprises a water reducing agent, a surfactant and water. The modified recycled aggregate and the nanometer reinforcing material are adopted, particularly, after the surface of the recycled aggregate is subjected to acid etching and plasma treatment, the surface of the recycled aggregate is subjected to acid etching and plasma treatment, and the surface of the nanometer reinforcing material is subjected to acid etching and plasma treatment, so that the surface of the recycled aggregate is subjected to acid etching and plasma treatment, and the surface of the recycled aggregate is subjected to acid etching and plasma treatment; the bonding performance with a cement matrix is enhanced, and the mechanical property of the pervious concrete is remarkably improved. The modification treatment ensures that the pervious concrete can meet higher performance requirements in high-strength application scenes (such as heavy traffic roads).

The invention relates to a two-agent type copper acid etching solution for a liquid crystal panel as well as a preparation method and application of the two-agent type copper acid etching solution. The etching liquid comprises an etching liquid main agent and an etching liquid auxiliary agent, and the etching liquid main agent comprises the following components in parts by weight: 5-20 parts of hydrogen peroxide; 5-15 parts of an acidic material; 3-10 parts of an organic base; 0.01 to 0.1 part of a corrosion inhibitor; 0.01 to 0.08 part of a chelating agent; 0.3-2 parts of a stabilizer; 60 to 80 parts of deionized water; the etching liquid auxiliary agent comprises the following components: 30-45 parts of an acidic material; 30 to 50 parts of organic base; 0.02 to 0.2 part of a corrosion inhibitor; 0.3-2 parts of a stabilizer; and 40 to 60 parts of deionized water. The chelating agent in the etching solution has double effects of corrosion inhibition and chelation, the pH value of the main agent can be adjusted, the etching environment of the etching solution is stabilized, the service cycle of the main agent in the etching process is prolonged, the etching capability of the two-agent type etching solution can be kept consistent after 48 hours, and the pH value and the hydrogen peroxide content are kept stable.

The invention relates to the technical field of road engineering materials, in particular to a blade glass fiber regenerated RPC type wear-resistant and rut-resistant rubber and plastic composite auxiliary material. The material is prepared from the following components in parts by weight: 40 to 60 parts of regenerated polyethylene, 20 to 40 parts of modified wind driven generator blade regenerated glass fiber powder, 10 to 20 parts of rubber powder, 3 to 8 parts of maleic anhydride grafted polyethylene, 5 to 10 parts of styrene-butadiene-styrene block copolymer (SBS), 1 to 3 parts of polyethylene wax and 5 to 10 parts of calcium powder. The preparation process of the modified regenerated polyethylene comprises the steps of isocyanate esterification and porous microspheroidization. The modified wind driven generator blade regenerated glass fiber powder is prepared by performing acid etching on wind driven generator blade regenerated glass fiber powder, performing plasma activation, and compounding polyfunctional group titanate and a polyamino silane coupling agent. The leaf glass fiber regenerated RPC type wear-resistant and rut-resistant rubber and plastic composite auxiliary material prepared by the preparation method disclosed by the invention has the advantages that various properties of an asphalt pavement are remarkably improved, meanwhile, green cyclic utilization of waste resources is realized, and remarkable economic and social benefits are achieved.

The invention provides a hierarchical porous silicon material and a preparation method thereof, and belongs to the technical field of comprehensive utilization of fly ash. The preparation method of the hierarchical porous silicon material provided by the invention comprises the following steps: mixing fly ash and an activating agent, and calcining to obtain activated fly ash; the activating agent comprises at least one of sodium salt and potassium salt; and mixing the activated fly ash with hydrochloric acid, and carrying out acid etching to obtain the hierarchical porous silicon material. According to the invention, at least one of sodium salt and potassium salt is adopted to activate the fly ash, and at least one of Na < + > and K < + > in the activation process can promote the conversion of mullite in the fly ash to different mineral phase aluminosilicate, so that a nepheline structure of Na and / or K is formed; and then hydrochloric acid is adopted for acid etching, and the alumina component can be selectively etched, so that the hierarchical pore channel is constructed, the process is simplified, and template-free preparation of the hierarchical pore silicon material is realized.

The invention discloses a compatible molybdenum-aluminum mixed acid etching solution which comprises the following components in percentage by mass: 4%-7% of nitric acid, 55%-65% of phosphoric acid, 17%-28% of acetic acid, 0.5%-3% of an oxidizing additive, 0.05%-5% of a metal corrosion inhibitor and 10%-20% of deionized water, and the oxidizing additive is ceric nitrate and at least one selected from sodium nitrate, potassium nitrate and ammonium nitrate; the etching liquid does not contain other organic components except for organic carboxylic acid and organic carboxylate. According to the compatible molybdenum-aluminum mixed acid etching solution, on the basis that ceric nitrate is introduced, the content of nitric acid is reduced, the nitrate ion concentration is increased by adding nitrate, the overall oxidation performance of an etching solution system is improved, the etching rate ratio of different metals is adjusted, CD-Bias is reduced, the etching dip angles of a molybdenum single layer and a molybdenum-aluminum laminated layer are controlled to be kept at 20-50 degrees, and the problem of aluminum thorns is solved. The invention further discloses a molybdenum-aluminum etching method based on the compatible molybdenum-aluminum mixed acid etching solution.

The invention belongs to the technical field of catalytic materials, particularly relates to an electrocatalytic anode oxygen evolution reaction catalyst based on an anion exchange membrane electrolytic cell, and particularly relates to a high-entropy oxide electrocatalyst and a preparation method thereof. The high-entropy oxide electrocatalyst is composed of five metal elements of Ni, Co, Fe, Mn and Al, is loaded on a foamed nickel substrate, has a nanosheet structure, is rich in oxygen vacancies on the surface, has excellent electrochemical catalysis performance and stability, and is suitable for electrocatalysis of an electrolytic water anode side in an alkaline environment. According to the preparation method of the high-entropy oxide electrocatalyst, foamed nickel is used as a substrate, salts of five metals of Ni, Co, Fe, Mn and Al which are equal in mole are subjected to hydrothermal synthesis to form a precursor, and then the high-entropy oxide electrocatalyst is prepared through self-etching, annealing oxidation and acid etching, and the high-entropy oxide electrocatalyst is easy and convenient to operate, good in repeatability, controllable in cost, excellent in performance and suitable for large-scale production.

The invention relates to the technical field of lithium battery negative electrode materials, and discloses a preparation method of a lithium battery silicon-carbon composite negative electrode material with high cycle stability, and the preparation method comprises the following steps: carrying out magnesiothermic reduction and acid etching on micron silicon powder and magnesium powder to prepare porous silicon particles; growing carbon nanotubes on the surfaces of the porous silicon particles and in pore channels in situ to construct a three-dimensional conductive network; styrene butadiene rubber and glucose are adopted as a composite carbon source to coat the product, and a composite carbon layer is formed through drying and gradient carbonization; and finally grinding and sieving the carbonized product. According to the preparation method disclosed by the invention, pores are constructed in micron silicon, and the micron silicon is externally coated with the composite carbon layer with flexibility and rigidity, so that the volume expansion of silicon is effectively buffered; the in-situ grown carbon nanotube network provides a stable electron conduction path; the micron-sized substrate reduces the specific surface area of the material and improves the first coulombic efficiency. Therefore, the prepared negative electrode material has high cycling stability and excellent rate capability.

The invention discloses a carbon microsphere-silicon negative electrode material and a preparation method thereof, mesocarbon microbeads are prepared by adding a nano template agent, porous mesocarbon microbead green pellets are obtained through acid etching, and nano-silicon-loaded mesocarbon microbeads are obtained through hydrothermal reaction reduction deposition of organic silicon in pore channels generated through etching, so that the carbon microsphere-silicon negative electrode material is obtained. And coating the outermost layer with a layer of amorphous carbon, and carbonizing to obtain the carbon microsphere-silicon negative electrode material. The mesocarbon microbeads prepared by taking the nano template agent as an additive have the advantages that the particle size distribution is concentrated, the particle size is moderate, a large amount of nano template agent exists inside and on the surface, and rich nano-scale pore channels are obtained after acid etching; in the hydrothermal process, organic silicon is deposited in situ on the outer surfaces of the mesocarbon microbeads and in pore channels to form uniform coating layers, the organic silicon and the mesocarbon microbeads are combined more tightly, the nanometer silicon loaded mesocarbon microbeads are obtained through magnesiothermic reduction, and the advantages of good conductivity, good rate capability and stable cycle performance are achieved.

The invention belongs to the field of fuel cells, and particularly relates to an electrode material for a fuel cell and a preparation method thereof, and the preparation method comprises the following steps: preparing polyimide containing amino POSS (Polyhedral Oligomeric Silsesquioxane); carrying out primary pyrolysis, and sequentially carrying out acid etching, cleaning and drying on a product to obtain primary carbonized polyimide; and grinding the primary carbonized polyimide, performing pyrolysis again, and sequentially performing acid etching, cleaning and drying on the product to obtain the electrode material for the fuel cell. The electrode material has a good graphite structure and a rich pore structure, so that ions and electrons can be quickly transferred in pores while the good conductivity of the material can be ensured; meanwhile, introduction of non-metal nitrogen heteroatoms can increase active sites, the electrochemical activity of the material is remarkably improved, and the material is suitable for being used as an electrode material of a fuel cell.

The invention relates to the technical field of photoetching, in particular to an anti-HF photoresist-removing alkali-soluble photoresist and a preparation method thereof. The problems that in the prior art, photoresist is poor in hydrofluoric acid resistance effect, and alkali is difficult to dissolve in the photoresist removing process are solved; the preparation method comprises the following steps: introducing a silicon-oxygen bond to obtain modified phenolic resin, adding a fluorine-containing acrylate monomer to obtain modified acrylate, stirring, dispersing, filtering and removing impurities from the modified phenolic resin, the modified acrylate, propylene glycol methyl ether acetate, a photosensitive substance and an auxiliary agent to obtain a photoresist colloid; stirring and dispersing the photoresist colloid and the modified nano titanium dioxide, and removing impurities to obtain the hydrofluoric acid-resistant degumming alkali-soluble photoresist; rigid silica groups and rigid fluorine-containing groups are introduced, modified nano titanium dioxide is cooperatively used for filling gaps of photoresist resin, the hydrofluoric acid resistance of the photoresist is improved, meanwhile, after acid etching, the resin gaps are used for improving the alkali dissolution rate, and pollutant generation and organic solvent use in the photoresist removing process are reduced.

The invention provides a novel implant surface treatment method and device, and the method comprises the following steps: carrying out sand blasting treatment on an implant by adopting TA4G medical titanium sand, and controlling the sand blasting parameters to be that the air pressure is 0.18-0.25 Mpa, the distance between a spray gun nozzle and the implant is 3-8 mm, the single sand blasting time is 5-13 seconds, and the sand blasting times is 2-5; then carrying out acid etching treatment on the implant subjected to sand blasting by using a mixed acid solution of sulfuric acid and hydrochloric acid, wherein the concentration of the hydrochloric acid is 18-36%, and the concentration of the sulfuric acid is 15-48%; and finally, cleaning the implant subjected to acid etching treatment. The particle size of TA4G medical titanium sand used in the sand blasting treatment is 40-80 meshes. The invention provides a novel sand blasting and acid etching surface treatment process, provides a better implant surface treatment solution, not only solves the problems in the prior art, but also brings about optimized surface structure, enhanced hydrophilicity and bone combination rate, reduced material pollution and stronger parameter controllability. Therefore, a better choice is provided for manufacturing and clinical application of the dental implant.