325 results about "Copper nanoparticle" patented technology

The invention discloses a supported double perovskite photocatalytic material which is prepared by the following steps: putting copper nanoparticles and double perovskite Cs2NaBiCl6 into a water-absolute ethyl alcohol mixed solution, carrying out ultrasonic dispersion, heating the dispersion solution to 55-65 DEG C, carrying out cooling crystallization at a rate of 1-2 DEG C / min, completing the reaction when the temperature is reduced to 25 DEG C, carrying out solid-liquid separation on the reaction product, and washing and drying the solid, the Cu nanoparticle-loaded double-perovskite photocatalytic material is applied to photocatalytic reduction of CO2, the catalyst has the characteristics of high reduction catalysis efficiency and good selectivity, the performance is stable after repeated cyclic utilization, and the material disclosed by the invention is simple in preparation process, high in efficiency and suitable for large-scale production and market popularization and application.

The invention discloses photo-thermal controlled-release nitric oxide anti-biofilm hydrogel based on click reaction crosslinking as well as a preparation method and application of the photo-thermal controlled-release nitric oxide anti-biofilm hydrogel based on click reaction crosslinking, the hydrogel is prepared by taking azide group-containing four-arm polyethylene glycol and alkynyl modified hyaluronic acid as matrixes through click chemistry rapid crosslinking under the catalysis of copper-based nanoparticles, the antibacterial biological membrane has remarkable dual anti-biological membrane and anti-inflammatory effects, and can be applied to wound treatment of bacterial biological membrane infection; through a wound surface coating form, under near-infrared light irradiation, copper nanoparticles generate a mild photothermal effect to remove a biological membrane, and Cu < 2 + > is released to promote fibroblast proliferation; nitric oxide can be controllably released, a biological membrane is synergistically eliminated by enhancing lipid peroxidation and destroying a bacterial membrane structure, meanwhile, angiogenesis is promoted, collagen deposition is stimulated, and the wound healing process is accelerated; the invention has the functions of efficient antibiosis and tissue regeneration, and has wide clinical application prospect and development value in the field of infectious wound treatment.

The invention discloses a preparation method of a modified electrode based on carbon nanofibers and application of the modified electrode in efficient reduction of nitrate and removal of associated organic matters, and belongs to the crossing field of materials science, chemistry and environmental engineering. The preparation method comprises the following steps that firstly, foamed nickel is pretreated, then, carbon nanofibers are loaded on the pretreated foamed nickel through an impregnation and calcination method, and finally, metal copper is deposited on the surfaces of the carbon nanofibers through an electro-deposition method. The introduction of the carbon nanofibers provides a larger specific surface area for the metal copper, promotes the high dispersion of metal copper nanoparticles, and affects the formation of a copper crystal face, thereby significantly improving the catalytic activity of the electrode. The electrode prepared by the method has excellent electro-catalytic performance, is relatively low in cost, is easy to operate and control, and is easy to realize industrial production. The electrode can simultaneously realize efficient reduction of nitrate and degradation of organic matters in an electro-catalysis system, and has a wide application prospect.

The invention discloses a preparation method and application of pH-responsive double-synergistic-therapy hydrogel. The hydrogel is mainly prepared from oxidized fucoidin (OFU), carboxymethyl chitosan (CMCs), zinc peroxide / copper nanoparticles (ZnO < 2-Cu >) and arginine (L-ARG). Under a gastric acid condition, the hydrogel generates H2O2 through zinc peroxide, copper ions catalyze H2O2 through a Fenton-like reaction to generate OH <->, arginine can catalyze H2O2 to generate NO, and the copper ions and the arginine act together to destroy a helicobacter pylori biological membrane and kill bacteria. The hydrogel has good injectability, self-healing property and adhesivity, is beneficial to intragastric injection application and can be adhered to the stomach, and the administration concentration of an infected part is improved; the antibacterial effect is generated only under the gastric acid condition, the helicobacter pylori biological membrane can be destroyed, and the helicobacter pylori antibacterial agent can be applied to the helicobacter pylori which is difficult to eradicate in the stomach of the human body.

The present invention discloses a bismuth-copper single-atom alloy catalyst, a preparation method and an application thereof. The catalyst includes copper nanoparticles and bismuth atoms. The copper nanoparticles are of a polycrystalline structure, and the bismuth atoms are dispersed in the copper nanoparticles in a single-atom form. The catalyst is prepared by means of thermal decomposing the metal complex and the followed in-situ electroreduction. The preparation method of the bismuth-copper single-atom alloy catalyst of the present invention is simple to operate, and the single-atom bismuth content is adjustable. The single-atom bismuth content can be adjusted by changing reaction conditions. By means of loading mutually isolated bismuth atoms on the copper nanoparticles, the electronic state of copper atoms is adjusted, such that an ability of bismuth-copper single-atom alloy to catalyze carbon-carbon coupling is improved, so as to obtain a higher selectivity of electrocatalytically reducing carbon dioxide to a multi-carbon product, providing a new way for efficient conversion of carbon dioxide.

The invention discloses copper paste, an electrode and a preparation method and application of the electrode, the electrode comprises copper powder, the copper powder comprises nano-copper particles and flaky copper powder, the nano-copper particles comprise at least two connected copper nanoparticles, and the adjacent copper nanoparticles are connected in a surface contact mode. According to the electrode disclosed by the invention, the nano-copper particles formed by connecting more than two copper nano-particles are filled in the gap areas among the large-size flaky copper powder, so that the nano-copper particles are in direct contact with the flaky copper powder, conductive channels among the conductive particles are smoother, and the structure of the electrode is more compact due to the filling of the nano-copper particles; the bulk resistance of the electrode is greatly reduced and is equal to the conductivity of a silver electrode; the nano-copper particles can also be used as an auxiliary adhesive after being sintered and cured, so that the adhesive force between the copper grid line and the solar cell is improved, and the connection between the grid line and the solar cell is firmer.

The invention discloses a conductive hydrogel for promoting bone growth and a preparation method and application thereof.The preparation method comprises the steps that 1, a methacrylic anhydride gelatin hydrogel prepolymer solution is prepared, a photoinitiator is dissolved in deionized water, and a solution with the mass-volume concentration of 0.003-0.005 g / mL is prepared; methylacrylic anhydride gelatin Gelma is dissolved in the solution, and a methylacrylic anhydride gelatin hydrogel prepolymerization solution is prepared; (2) preparing a CuNPs dispersion liquid; (3) preparation of photo-crosslinking hydrogel: mixing the methylacrylic anhydride gelatin prepolymerization liquid and the CuNPs dispersion liquid to prepare a methylacrylic anhydride gelatin copper nanoparticle conductive hydrogel mixed liquid; in the mixed solution, the massic volume concentration of the methacrylic anhydride gelatin is kept at 0.05 g / mL, the concentration of the copper nanoparticles is 10 mmol / L-40 mmol / L, bubbles are removed, the mixed solution is added into a mold, ultraviolet irradiation is performed, and the photo-crosslinking hydrogel can be prepared. The gel has good conductivity, pore structure, biocompatibility and mechanical property, and has a good osteogenesis promoting effect. The preparation process is simple, and the repeatability is high.

The invention provides a preparation method of a Cu / CNTs epoxy resin composite material with electric conduction, heat conduction and mechanical properties, uniformly distributed copper nanoparticles are generated on the surface of a single-walled carbon nanotube through a high-temperature surface reduction method, the prepared Cu / CNTs are uniformly dispersed in an epoxy resin component, and the weight ratio of the Cu / CNTs in the whole composite material is 1-4 wt%. The method has the advantages of simple steps and mild conditions, Cu / CNTs is uniformly dispersed in an epoxy resin matrix as a nanofiller, the electric conductivity, heat conductivity and mechanical properties of the epoxy resin composite material are effectively improved, and the material can solve the problems of heat dissipation and antistatic properties of electronic components, so that the service life of electronic and electrical products is prolonged.

The invention discloses antibacterial glaze paste for a ceramic false tooth and a preparation method thereof, and belongs to the technical field of antibacterial glaze paste manufacturing, the antibacterial glaze paste for the ceramic false tooth comprises: 70-95% of glaze powder matrix composed of feldspar, quartz, kaolin and calcium carbonate; the antibacterial agent is composed of zinc oxide and bismuth oxide, the molar ratio of the bismuth oxide to the zinc oxide is 5%-18%, the surfaces of particles of the antibacterial agent are coated with a plurality of silicon dioxide shell layers, the thickness of the shell layers is 3-15 nm, and the shell layers are treated through a coupling agent; the antibacterial agent can further contain a trace amount of silver or copper nanoparticles with the mass fraction of 0.01-0.3%, and through the synergistic effect of zinc oxide and bismuth oxide, limited release of multiple SiO2 shell layers and addition of a trace amount of Ag / Cu, the ceramic false tooth antibacterial glaze paste can keep efficient antibacterial ability for a long time without external illumination or special excitation conditions, the antibacterial rate is larger than or equal to 98%, and the antibacterial effect is good. The method is obviously superior to uncoated or single-step sintered contrast samples.

The invention discloses a high-density ultrafine-particle-size copper-based catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. Nitrogen-doped carbon-coated copper nanoparticles are prepared through coordination of polyhydroxy glucose and citrulline with copper ions, drying and in-situ pyrolysis, so that the high-load, high-dispersion, high-density and ultrafine-particle-size copper-based catalyst is obtained. According to the method, growth and leaching of copper nanoparticles under the water phase reforming condition are effectively inhibited, and the hydrogen production performance of the catalyst is greatly enhanced. The catalyst has the advantages of high hydrogen production rate, high hydrogen selectivity and good hydrothermal stability. The high-density ultrafine-particle-size copper-based catalyst is especially suitable for catalyzing hydrogen production through ethanol water phase reforming, the hydrogen production rate reaches 33.8 micromol.gcat <-1 >. S <-1 > under the condition of 210 DEG C, the hydrogen selectivity is higher than 99.9%, and long-time efficient hydrogen production through ethanol water phase reforming is achieved.

The invention relates to a porphyrin metal organic framework composite material, a preparation method and a biogenic amine SERS (Surface Enhanced Raman Scattering) array sensor. The preparation method of the composite material comprises the steps that a copper precursor solution is added into a surfactant, heating reaction is conducted, a reducing agent is added, heating reaction is conducted, and copper nanoparticles are obtained; the preparation method comprises the following steps: adding a transition metal salt and a surfactant into an organic solvent, adding a porphyrin ligand, carrying out a solvothermal reaction, carrying out centrifugal separation, washing and drying to obtain a porphyrin metal organic framework material, and dispersing the porphyrin metal organic framework material into the organic solvent to obtain a dispersion liquid A; and dispersing copper nanoparticles in the dispersion liquid A, carrying out a second heating reaction, and carrying out centrifugal separation, washing and drying to obtain the porphyrin metal organic framework composite material. The invention also provides the porphyrin metal organic framework composite material prepared by the preparation method, and the application of the porphyrin metal organic framework composite material as a biogenic amine SERS array sensor. The invention solves the problem that the accuracy of the detection result is influenced because the traditional biogenic amine detection method is difficult to realize field detection.

The invention discloses preparation and application of a core-shell structure carbon-coated copper nano-antibacterial agent with a slow release function, and relates to the technical field of antibacterial nano-metal materials, and the preparation method comprises the following steps: preparing by using a plasma arc method, taking pure copper as an anode, selecting a graphite rod as a cathode, and after the vacuum degree of an electric arc furnace reaches 10 <-4 > Pa or above, carrying out ultrasonic treatment; the method comprises the following steps: injecting a carbon source into a high-vacuum cavity, purifying in argon, collecting black powder consisting of nano-particles, carrying out a carbon shell burning process on the collected nano-particles, cooling, and recovering. The prepared carbon-coated copper nano-particles are of a core-shell structure with copper as a core and porous carbon as a shell, the porous carbon shell protects the nano-copper particles from being oxidized easily, the high activity of the nano-copper is kept, the nano-copper can achieve efficient and broad-spectrum sterilization at low concentration, meanwhile, slow release of the copper is achieved, and it is guaranteed that the antibacterial agent is higher in biological safety and environment friendliness.

The invention provides a copper-nickel alloy friction film based wind power gear oil additive composition and a preparation method thereof, belongs to the technical field of lubricating oil, and aims to solve the technical problems of low bearing capacity and poor antifriction effect of a friction film formed by wind power gear oil. The wind power gear lubricating oil comprises the following components in percentage by mass: 0.8%-1.4% of a sulfur-containing extreme pressure agent, 0.4%-1.0% of a phosphorus-containing anti-wear agent, 0.5%-1.5% of copper nanoparticles, 0.5%-1.0% of nickel acetylacetonate, 0.15%-0.25% of an antioxidant, 0.1%-0.20% of an anti-rust agent, 0.015%-0.025% of an anti-foaming agent, 0.04%-0.05% of a demulsifying agent, 0.4%-0.8% of a dispersing agent and 93.8%-97.1% of synthetic base oil, and the sum of the percentages of the components is 100%. Nickel acetylacetonate forms high-activity nickel ions under friction induction, the high-activity nickel ions react with a friction pair substrate to form an alloy interface layer, and meanwhile the alloy interface layer and copper nanoparticles form a high-strength copper-nickel alloy friction film through interface alloy.

The invention belongs to the field of electronic packaging, and relates to a nano-copper metal material for low-temperature sintering conductive paste and preparation and application of the paste of the nano-copper metal material. The nano-copper metal material comprises copper nanoparticles and copper nanowires, and the copper nanoparticles and the copper nanowires are both prepared through a one-step hydrothermal method: (1) the copper nanoparticles are prepared, specifically, the high-purity copper nanoparticles are obtained through a hydrothermal reaction by adjusting the pH value; (2) preparing a copper nanowire: carrying out hydrothermal reaction on a copper source, a reducing agent and an end-capping reagent, so that copper ions are reduced into quintuple twin crystal seeds in one step and further directionally deposited into the copper nanowire; and (3) preparing conductive paste: mixing the nano-copper material and an organic reagent according to a certain proportion, and homogenizing to obtain the low-temperature sintering type conductive copper paste. The low-temperature copper paste is used for preparing the low-temperature copper paste for bonding a chip and a substrate. The prepared nano-copper metal material for the low-temperature sintering conductive paste is stable in size and simple in preparation process, and the prepared paste is good and excellent in sintering performance (the shear strength is 25 MPa, and the thermal conductivity is 4 W / m.K).

The invention discloses an antibacterial dressing based on gallic acid-copper coated gamma-polyglutamic acid and a preparation method and application thereof, and belongs to the technical field of biomedicines.The preparation method comprises the steps that gallic acid and copper chloride dihydrate are dissolved in pure water according to the mass ratio of 3: 1, and stirring is conducted to form a solution I; stirring and reacting the solution I at 40 DEG C for 24 hours, centrifuging, collecting precipitate, washing with pure water, and freeze-drying to obtain gallic acid-copper nanoparticles; the gallic acid-copper nanoparticles and gamma-polyglutamic acid powder are mixed and dissolved in pure water according to the mass ratio of 3: 20, and after freeze drying, gallic acid-copper coated gamma-polyglutamic acid hydrogel powder is obtained. The gallic acid-copper coated gamma-polyglutamic acid hydrogel powder disclosed by the invention can absorb exudate near a wound and is subjected to in-situ gelation to form a hydration layer, so that damage to newborn tissues caused by frequent dressing replacement is avoided; it is verified that the healing promoting effect of the hydrogel can be remarkably enhanced through blue light adjuvant therapy, and the healing speed of infected wounds is remarkably increased.

The invention discloses a composite oxidized particle filter material and a preparation method thereof, and particularly relates to the technical field of oxidized particle filter materials, the filter material takes a ternary composite oxide of cerium dioxide-cobaltosic oxide-nickel oxide as a core material, has a hierarchical pore structure, and is coated with a pH responsive coating on the surface; the preparation method comprises the following steps: S1, biological template pretreatment; S2, sol-gel synthesis; S3, graded pore channel construction; and S4, surface modification. According to the invention, the cerium dioxide-cobaltosic oxide-nickel oxide ternary composite oxide is taken as a core, pollutants are efficiently degraded under visible light and infrared light by virtue of graded pore channels, surface copper nanoparticles and internal up-conversion nanoparticles, and the quaternary ammonium salt compound grafted on the surface has good antibacterial property, can inhibit microorganism breeding and prolong the service life of the filter material; the whole preparation process is suitable for industrial production.

Provided are copper nanoparticles that: (I) have excellent dispersibility in an organic solvent and thus makes a paste containing the copper nanoparticles from which a highly smooth coating film can be formed; and (II) have excellent sinterability at low temperatures. At least a portion of the surface layer of each of the copper nanoparticles coated by a reducing agent is a film that contains copper oxide and optionally contains copper carbonate. The surfaces of the copper nanoparticles are coated with a reducing agent, where the mass carbon concentration is 0.10% to 2.00%.

The invention provides high-conductivity low-temperature copper paste as well as a preparation method and application thereof. The high-conductivity low-temperature copper paste comprises copper nanoparticles, an organic carrier and an antioxidant, the surface of the copper nanoparticle does not contain macromolecular ligand, the purity is greater than or equal to 98%, the particle size is less than or equal to 1 mu m, and the particle size variation coefficient is less than or equal to 35%; and after the high-conductivity low-temperature copper paste is cured at 200 DEG C, the resistivity is less than or equal to 34.4 mu omega.cm. The surfaces of the copper nanoparticles do not contain macromolecular ligands, so that the macromolecular ligands can be prevented from remaining on the surfaces of the copper nanoparticles in the process of regulating and controlling the morphology of the particles, and the organic carrier can uniformly disperse the copper nanoparticles and provide the bonding force between the slurry and a base material after the slurry is cured; the high-conductivity low-temperature copper paste has the advantages that the high-conductivity low-temperature copper paste is good in conductivity and adhesion, the printing precision and the oxidation resistance of traditional paste can be improved, and the high-conductivity low-temperature copper paste is suitable for large-scale production and preparation of precise electronic products.

The invention relates to a cationic polymer coated copper-based catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method comprises the following steps: adding copper nanoparticles into a quaternized spiropiperazine solution, uniformly stirring, adjusting the pH value to 9-13, and then adding a 1, 3, 5-benzoyl chloride solution for reaction to obtain the copper-based catalyst coated with the cationic polymer. The copper-based catalyst coated with the cationic polymer shows excellent carbon dioxide electrocatalytic reduction performance in an electrolytic tank under the acidic condition through a three-in-one mechanism of electrostatic enrichment, coordination stabilization and cross-linking strengthening, ethanol can be efficiently prepared, and the Faraday efficiency reaching up to 50% is achieved under the current density of 250 mA / cm < 2 >.

The invention discloses a supported copper-based catalyst for high-temperature synthesis of methanol as well as a preparation method and application of the supported copper-based catalyst, and belongs to the technical field of catalyst preparation and application. According to the catalyst, copper serves as a main active component, an oxide containing zinc and zirconium serves as a carrier, copper nanoparticles are loaded on the carrier in one step through a high-energy plasma sputtering method, and the catalyst can be applied to the reaction for preparing methanol through carbon dioxide hydrogenation under the condition of high reaction temperature. Compared with a commercially used Cu / ZnO / Al2O3 catalyst, under the reaction condition of 300 DEG C, the selectivity of methanol is improved to 85% from 10%, and the space time yield of methanol is improved by 2.6 times. The method is beneficial to exploiting a new field of synthesizing methanol by using a copper-based catalyst at a relatively high reaction temperature, on one hand, the problem that a noble metal catalyst or an oxide catalyst is easy to generate a methane or carbon monoxide byproduct is solved, and on the other hand, the seesaw limitation that the conversion rate of carbon dioxide and the selectivity of methanol cannot be obtained at the same time is broken through; good application prospects are realized.

The invention discloses temperature-sensitive antibacterial hydrogel based on ultra-small-particle-size copper nanoparticles and a preparation method of the temperature-sensitive antibacterial hydrogel, and relates to the technical field of biomedical materials. The preparation method of the temperature-sensitive antibacterial hydrogel comprises the step of uniformly mixing the gel matrix, the stabilizer, the pH buffer solution and the ultra-small-particle-size copper nanoparticles to prepare the temperature-sensitive antibacterial hydrogel. The preparation method of the copper nanoparticles with the ultra-small particle size comprises the following steps that lactoferrin is dissolved in water, copper sulfate pentahydrate is added, an alkali solution is added to adjust the pH of the solution to be 8-14, then a reducing agent is added for a reaction, dialysis and drying treatment are conducted, and the copper nanoparticles with the ultra-small particle size are obtained. The hydrogel has good injectability, can release the copper nanoparticles under specific conditions and rapidly sterilize, in addition, the hydrogel is convenient to synthesize and simple to operate, has good biocompatibility, shows relatively low cytotoxicity to cells, and has relatively great application potential in the process of treating skin wound infection.

The invention relates to a cellulose membrane-based fluorescence colorimetric sensor based on nano-copper and MOF (Metal Organic Framework), a preparation method of the cellulose membrane-based fluorescence colorimetric sensor and application of the cellulose membrane-based fluorescence colorimetric sensor in tetracycline detection The sensor comprises a cellulose membrane, nano-copper clusters and MOF-5, the nano-copper clusters are fixed on the surface of the porous cellulose membrane through hydrogen bonds to form CCM, and then the MOF-5 is further loaded on the surface of the cellulose membrane to obtain the CCMM. When tetracycline exists in a sample to be detected, Zn (II) in the sensor and tetracycline form a luminous complex, so that the color of the trigger fluorescence is changed from orange red to green. The sensor provided by the invention has the advantages of high sensitivity (the detection limit is 0.5 mu M), quick response (qualitative treatment within 5 seconds), excellent selectivity (resistance to influences of various metal ions and interferents), good long-term stability (the performance is not changed after the sensor is stored for 60 days) and the like, and can be used for carrying out real-time visual detection on TC in drinking water, environmental water, milk and other samples.

A method for preparing a multi-carbon product by electrically reducing carbon dioxide relates to the technical field of energy catalysis and is carried out in a membrane electrode electrolytic tank, and self-assembled spherical copper nanoparticles with rough surfaces are used as a cathode catalyst. By introducing a mixed gas of carbon dioxide and water into the cathode side, the carbon dioxide is electrically reduced to prepare a multi-carbon product. By adjusting the moisture pressure, the catalytic performance is improved, and the problems of low selectivity and low stability under high current density are solved. Cuprous oxide and metal copper are adopted under the reaction potential, and high reaction activity and ethylene and ethanol selectivity are shown. Under the conditions that the water pressure is 2.7 kPa and the current density is 1.0 A # imgabs0 #, the Faraday efficiency of a multi-carbon product reaches 80%, the Faraday efficiency of ethylene reaches 58% at most, and an excellent carbon dioxide reduction effect is shown. The method is simple in preparation and easy to implement, and the catalyst is excellent in performance.

The invention discloses a three-dimensional porous self-supporting electrode constructed by in-situ growth of copper nanoparticles on the surface of foamed nickel for hydrogen evolution by water electrolysis and a preparation method of the three-dimensional porous self-supporting electrode. The preparation method of the three-dimensional porous self-supporting electrode constructed by in-situ growth of the copper nanoparticles on the surface of the foamed nickel comprises the following steps: taking the foamed nickel as a working electrode, taking a mixed solution composed of a copper salt, a chlorine salt, an inorganic acid and deionized water as an electrolyte, and carrying out electrodeposition by adopting a timing coulometric method to obtain the three-dimensional porous self-supporting electrode constructed by in-situ growth of the copper nanoparticles on the surface of the foamed nickel; the three-dimensional porous self-supporting electrode constructed by in-situ growth of the copper nanoparticles on the surface of the foamed nickel is obtained. According to the preparation method, the self-supporting electrode without the adhesive is prepared through the one-step electrodeposition method with the hydrogen bubbles as the dynamic template, no precious metal participates in the self-supporting electrode, and the problems that active sites are blocked, the conductivity is reduced or gas transmission is inhibited due to the fact that a Nafion solution and other polymer adhesives with poor conductivity are used in a traditional powdery catalyst can be effectively solved. The electrode prepared by the invention has excellent HER performance and good stability.

The invention relates to the technical field of photocatalytic processes, in particular to a catalyst for preparing methanol through photocatalytic reduction of CO2 as well as a preparation method and application of the catalyst. The catalyst comprises a composite carrier and active sites dispersed on the surface or in pores of the composite carrier, the composite carrier is of a heterojunction composite structure formed by a hollow TiO2 sphere and MCN, the hollow TiO2 sphere comprises a shell layer and a spherical cavity structure located in the shell layer, the shell layer is formed by TiO2 nanoparticles, and the MCN has a mesoporous pore structure; a II-type or Z-type heterojunction interface is formed between the hollow TiO2 spheres and the MCN through physical contact and chemical action; the active sites comprise copper nano species, sulfur vacancy defects and amino groups; the copper nano species are copper nano particles or clusters, and the valence state of copper is 0 and / or + 1 valence amino is grafted on the surface of the composite carrier through an organic long chain. The catalyst provided by the invention can greatly improve the yield and selectivity of methanol prepared by photocatalytic reduction of carbon dioxide.

The invention discloses a preparation method of a bionic wear-resistant composite structure for a railway turnout slide plate, and belongs to the field of rail transit, and the preparation method comprises the following steps: step 1, constructing a bionic sand python snake slough structure model; 2, preparing a bionic sand python snake slough structure; 3, the polytetrafluoroethylene spherical powder is submerged in absolute ethyl alcohol, 5 wt% of graphene nanosheets, 1 wt% of spherical copper nanoparticles and 1 wt% of KH550 are added, and finally a mixed solution is obtained; 4, drying the mixed solution to obtain composite powder; 5, placing the composite powder on the bionic sand python snake slough structure, and performing cold pressing for multiple times to obtain a semi-finished bionic wear-resistant composite structure; and 6, the semi-finished bionic wear-resistant composite structure obtained after cold pressing in the step 5 is completed is placed in a sintering furnace to be subjected to melting sintering treatment, and the bionic wear-resistant composite structure is obtained after cooling.

The application relates to the development and technical field of electrocatalysts, and discloses a benzothiadiazole modified single-atom zirconium-doped metal copper electrode material and a preparation method and application thereof. The preparation method comprises the following steps: dissolving inorganic copper salt and inorganic zirconium salt, adding the inorganic copper salt and the inorganic zirconium salt into an alkaline solution, and performing hydrothermal reaction to obtain a single-atom zirconium-doped copper oxide precursor; dissolving benzothiadiazole, adding the benzothiadiazole into a dispersion solution of the single-atom zirconium-doped copper oxide precursor to obtain a mixed solution; spraying the mixed solution on a polytetrafluoroethylene film substrate loaded with copper nanoparticles to obtain a benzothiadiazole modified single-atom zirconium-doped copper oxide precursor electrode material; and performing electrochemical reduction treatment on the benzothiadiazole modified single-atom zirconium-doped copper oxide precursor electrode material to obtain a benzothiadiazole modified single-atom zirconium-doped metal copper electrode material. The electrode material is applied to an electro-reduction carbon dioxide reaction as a working electrode, exhibits excellent electro-reduction CO2 performance in an acidic environment, and realizes high-value-added C 2+ product with high selectivity.

The invention relates to the technical field of fibers, and discloses a high-breathability antibacterial functional composite fabric and a preparation method thereof. The preparation method comprises the following steps: loading copper nanoparticles on nano zinc oxide by an in-situ reduction method to obtain an inorganic antibacterial agent, uniformly mixing the inorganic antibacterial agent and an organic antibacterial agent 1-chloro-2, 2, 5, 5-tetramethyl-4-imidazolinone with polyacrylonitrile to obtain a spinning solution, and carrying out electrostatic spinning on the surface of an acrylic fabric to obtain the antibacterial fabric. The obtained composite fabric has high air permeability and excellent antibacterial property.

The application provides a one-dimensional iron oxide nanorod heterojunction composite material and a preparation method and application thereof, and belongs to the technical field of photoelectrocatalytic water splitting hydrogen production. The composite material provided by the application comprises: one-dimensional iron oxide nanorods, cuprous sulfide nanoparticles loaded on the one-dimensional iron oxide nanorods, and cobalt hydroxide nanosheets coated on the surfaces of the one-dimensional iron oxide nanorods and the cuprous sulfide nanoparticles. On one hand, the Fe2O3 / Cu2S p-n heterojunction is introduced to accelerate the separation of photo-generated carriers in the Fe2O3 nanorod array, and on the other hand, the Co(OH) x The surface OECs accelerate the kinetics process of interfacial water oxidation, the rapid depletion of photo-generated holes further improves the charge separation of the photoanode surface, and the synergistic effect between the Fe2O3 / Cu2S p-n heterojunction and the OECs significantly improves the PEC water splitting performance of the iron oxide nanorod array composite material.

One object of the present application is to provide composite copper nanoparticles that have high dispersibility in organic solvents and can be used to form a smooth electrode film. The present invention provides composite copper nanoparticles in which the surfaces of copper nanoparticles are modified with a silane coupling agent, wherein the copper nanoparticles have a coating film containing copper oxide on at least a part of the surface, and wherein the mass carbon concentration derived from the silane coupling agent in the composite copper nanoparticles is 0.1 to 1.2% by mass with respect to the total mass of the composite copper nanoparticles or wherein the number of surface groups derived from the silane coupling agent on the surface of the composite copper nanoparticles is 1.0 to 13.0 per 1 nm2 of the surface area of the composite copper nanoparticles