448 results about "Nano copper" patented technology

The invention discloses a nano-copper modified reduced graphene oxide powder preparation method, which comprises: S1, uniformly mixing a reduced graphene oxide dispersion liquid and a copper chloride solution to obtain a mixed liquid A; s2, reducing the mixed solution A by adopting a reducing agent to obtain a mixed solution B; s3, adjusting the pH value of the mixed solution B to 8-9 to obtain a mixed solution C; s4, titrating the mixed solution C with an alkaline solution until the mixed solution C is red, and standing and filtering to obtain a precipitate D; s5, washing the precipitate D until the pH value of supernatant liquid is neutral, and drying to obtain a precipitate E; and S6, sintering the precipitate E in an inert atmosphere to obtain the nano-copper modified reduced graphene oxide powder. The invention further discloses the nano-copper modified reduced graphene oxide powder, the high-strength and high-conductivity graphene copper plating-aluminum matrix composite and a preparation method of the high-strength and high-conductivity graphene copper plating-aluminum matrix composite.

The invention relates to the technical field of conductive copper paste, in particular to conductive copper paste prepared by combining liquid nonferrous metal with graphene and a preparation method of the conductive copper paste. The preparation method comprises the following steps: weighing nano-copper coated graphene composite powder, a liquid nonferrous metal, a binder, trifluoropropyltrimethoxysilane, an auxiliary agent and copper powder, and then preparing trifluoropropyltrimethoxysilane into a dilute solution; copper powder and the nano-copper coated graphene composite powder are mixed to obtain composite powder; the liquid nonferrous metal and the composite powder are stirred to obtain metal paste; and adding a resin solution and an auxiliary agent into the metal paste to form printing paste, and then standing and curing. According to the conductive copper paste, the liquid nonferrous metal serves as a main binding phase, the defect that the welding thrust is low due to a traditional resin system is overcome, the problems of dispersion and interface compatibility are solved through cooperation of the nano-copper-coated graphene and the silane coupling agent, and finally the conductive copper paste with extremely low resistance, high stability and ultrahigh welding thrust is obtained.

The invention relates to the technical field of liquid absorption cores of vapor chambers, in particular to a vapor chamber with a porous liquid absorption core of a secondary structure and a preparation method of the vapor chamber. The preparation method comprises the following steps that an upper cover plate and a lower cover plate are prepared; cutting the metal wire mesh to obtain a wire mesh structure, and fixing the wire mesh structure on the surface of one side of the lower cover plate; electroplating is carried out on the silk screen structure of the lower cover plate to deposit nano-copper; calcining and curing the secondary structure of the silk screen electroplated with the nano-copper; and packaging the upper cover plate and the calcined lower cover plate, and performing liquid injection, degassing, sealing welding and packaging treatment to obtain the vapor chamber. According to the vapor chamber, the liquid absorption core with a secondary structure is prepared on the silk screen of the lower cover plate through electro-deposition of nano copper, the nano copper structure on the silk screen serves as the liquid absorption core through calcination and solidification, the service life of the vapor chamber can be effectively prolonged, the secondary porous structure provides multi-stage hole distribution for the liquid absorption core, multiple liquid flowing channels are provided, and heat conduction is accelerated.

The invention provides a preparation method of a nanometer copper oxide sheet, and relates to the technical field of metal powder nanometer material preparation. The method comprises the following steps: preparing a copper salt into a copper precursor aqueous solution containing a surfactant, and preparing alkali into an alkaline solution; the copper precursor aqueous solution containing the surfactant is converted into copper micro-nano aerosol containing the surfactant, and the alkaline solution is converted into micro-nano aerosol containing alkali; the preparation method comprises the following steps: carrying out gas-phase confinement microcell mixing pre-reaction on the copper micro-nano aerosol containing the surfactant and the alkali-containing micro-nano aerosol to obtain a copper-alkali mixed solution, transferring the copper-alkali mixed solution into a polytetrafluoroethylene reaction kettle, and carrying out hydrothermal reaction to obtain a nano-particle solution containing a copper compound; and carrying out solid-liquid separation, washing, drying and roasting on the nano-particle solution containing the copper compound to obtain the nano copper oxide sheet. According to the invention, on the basis of improving the preparation efficiency of the nanometer copper oxide sheet, the preparation cost of the nanometer copper oxide sheet is reduced.

The invention discloses a high-transparency PVB intermediate film and a production process and application thereof, and relates to the technical field of PVB intermediate films, the high-transparency PVB intermediate film comprises the following raw materials by weight: 100 parts of PVB resin, 20-30 parts of a composite plasticizer, 0.5-0.9 part of an LDH-based composite antioxidant, 0.5-1 part of an ultraviolet light absorber, 0.1-1.5 parts of nano lanthanum hexaboride, 0.1-1.5 parts of porous hollow nano copper sulphide, and 0.1-2 parts of nano TiO2 / SiO2 core-shell particles. The PVB intermediate film provided by the invention is relatively high in light transmittance, low in haze value, and excellent in oxidation resistance, weather resistance and mechanical strength.

The invention discloses a preparation method of graphene-coated aluminum oxide nanoparticles and a reinforced copper-based composite material thereof, and belongs to the field of metal-based composite materials, graphite flakes are stripped into graphene through a wet ball-milling one-step method, the graphene coats the surfaces of aluminum oxide particles, then the graphene is mixed with nano copper powder, and the mixture is formed through a powder metallurgy process; according to the method, the traditional multi-step process is simplified, and the composite material has high wear resistance and excellent functional characteristics by utilizing the lubricity and electric conductivity / thermal conductivity of graphene, and is suitable for the high-end fields of heat dissipation of electronic devices, sliding bearings and the like.

The invention relates to the technical field of electrode plates, and discloses a dual-electrode plate of a solid-state lithium metal battery and a preparation method of the dual-electrode plate. Comprising the following operation steps: depositing nano-copper on one side of a polymer base material layer to obtain a copper base layer; further depositing foamy copper on the surface of the copper base layer to obtain a foamy copper layer; a pole piece A is formed; depositing metal aluminum on the other side of the polymer base material layer in the pole piece A to obtain an aluminum layer; a pole piece B is formed; depositing metal lithium on the surface of the foamy copper layer in the pole piece B to obtain a metal lithium layer; further coating the surface of the lithium metal layer with an organic solution, and drying to obtain a polymer solid electrolyte layer; a pole piece C is formed; coating the surface of the aluminum layer in the pole piece C with positive active slurry, and drying to obtain a positive active material layer which is taken as a pole piece D; and rolling the pole piece D, respectively carrying out transfer welding on the aluminum layer on the positive electrode side and the copper layer on the negative electrode side, and leading out a metal foil tab to obtain the dual-electrode pole piece of the solid-state lithium metal battery.

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 powder coating imitation copper wire drawing coating based on a gradient composite structure and a preparation method of the powder coating imitation copper wire drawing coating, and relates to the technical field of novel printing ink. The invention relates to a gradient composite structure-based powder coating copper-wire-drawing-imitating coating, which is characterized by comprising a bottom layer, a middle layer and a surface layer, wherein the bottom layer is an epoxy resin-based powder coating layer containing nano silicon dioxide; the middle layer is a copper-imitating ink wiredrawing layer containing micro-nano copper powder in directional arrangement; the surface layer is a water-based gloss oil layer containing a self-repairing flatting agent; wherein the bottom layer is formed by electrostatic spraying. Through the gradient composite structure design of the bottom layer, the middle layer and the surface layer, the coating provided by the invention shows remarkable advantages in the aspects of hardness (4H), salt fog resistance (more than 1000 hours), self-repairing property and the like, and overcomes the limitation that the traditional coating is insufficient in adhesive force and hard to consider both hardness and wear resistance.

The invention relates to the technical field of printed electronic materials, in particular to conductive copper ink for a printed circuit and a preparation method of the conductive copper ink. The conductive mica powder-graphene composite material comprises conductive mica powder, a nano-copper-graphene filler, flaky copper powder, spherical copper powder, an organic carrier, a dispersing agent, a coupling agent, an antioxidant and an auxiliary agent, a layer-point composite conductive structure is constructed through conductive mica powder and nano-copper-graphene filler, a close packing system is formed by combining particle size grading of copper powder with different morphologies, and the conductivity is guaranteed; by means of a chemical bonding interface formed by the coupling agent, the copper powder and the organic carrier, the integrity of the coating is enhanced, and stress cracking during welding is reduced; microencapsulated rosin in the auxiliary agent promotes wetting and spreading of the welding flux, titanate modified nano titanium dioxide constructs a three-dimensional cross-linked network to improve the bending resistance and thermal shock resistance of the coating, the falling phenomenon of components after welding is reduced, and the stability of the conductive copper ink in actual printed circuit production is improved.

The invention discloses a copper-clad plate material containing elastomer resin and a preparation method of the copper-clad plate material, and belongs to the technical field of new materials. The method comprises the following steps: mixing a styrene-butadiene-styrene block copolymer with polybutadiene rubber, adding nano-montmorillonite, and carrying out intercalation modification through hexadecyl trimethyl ammonium bromide to prepare nano-modified elastomer resin; the preparation method comprises the following steps: mixing polybutylene terephthalate with nano silicon dioxide, and carrying out surface modification by gamma-aminopropyltriethoxysilane and hexamethyldisilazane to obtain a resin matrix; mixing the two phases, adding citric acid, and carrying out microwave heating and high-shear dispersion to obtain a discrete material; carrying out hot pressing on the dispersion, adding polyurethane and polylactic acid, uniformly mixing, adding polydimethylsiloxane and sodium dodecyl benzene sulfonate, and curing to obtain a cured product; and coating the surface of the cured product with a nano-copper layer. The material has the characteristics of high peel strength, low dielectric loss, low water absorption and low thermal expansion, and is suitable for the field of high-speed low-loss copper-clad plates.

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 present invention discloses a nano copper-based catalyst, its preparation method, and its application in the electrocatalytic reduction of carbon dioxide and carbon monoxide. Copper chloride (or copper nitrate, copper acetate) is dissolved in ultrapure water, and a sodium borohydride solution is added dropwise. Stir at room temperature for 5-60 min, filter, and dry to obtain a nano copper catalyst. Further, through a displacement reaction, nano copper-palladium and copper-silver catalysts are obtained. The present invention is applied to the electrocatalytic reduction of carbon monoxide. In a membrane electrode assembly (MEA) electrolyzer, the Faraday efficiency of multi-carbon products (C2+) reaches up to 95%, the partial current density reaches up to 3 A cm-2, and the overall electrolyzer energy efficiency reaches up to 39%. It can stably electrolyze for 30 hours at 1 A cm-2. This nano copper catalyst is applied to the electrocatalytic reduction of carbon dioxide. In an MEA electrolyzer, the Faraday efficiency of C2+ reaches up to 66%, and the partial current density reaches up to 331 mA cm-2.

The invention discloses a method for preparing nano-copper particles from eucommia ulmoides extract and application of the nano-copper particles in a catalytic reduction reaction in the technical field of metal nano-materials, the eucommia ulmoides extract is adopted as a reducing agent, a bivalent copper salt solution is added, a reaction can be carried out in a water phase, and the nano-copper particles are generated. The raw materials are cheap and easy to obtain, the reaction conditions are easy to control, the process is simple, and the prepared nano-copper particles have good dispersity and show a good catalytic effect in the aspect of catalytic reduction of organic dye and nitrophenol.

The present invention belongs to the technical field of petrochemical catalysis, and relates to a preparation method for improving the stability of a Cu-Beta zeolite catalyst for preparing caprolactam from caprolactone, and the use thereof. In the present invention, a cavity-modified dealuminated Beta zeolite is used as a carrier, and copper is loaded in pore channels of the zeolite carrier by means of an improved ammonia distillation method. The cavity modification refers to subjecting the dealuminated Beta zeolite carrier to a desiliconization technique controlled by the use of a weak organic base so as to enlarge silanol nests generated by dealumination of the dealuminated Beta zeolite carrier, thereby better accommodating and stabilizing the nano and sub-nano copper particles. The core of the improved ammonia distillation method involves impregnating a zeolite carrier with an equal volume of a copper-ammonia complex solution, such that the copper-ammonia complex mainly undergoes, during ammonia distillation, a reaction of depositing copper hydroxide in zeolite pore channels, thereby improving the sintering resistance. The Cu-Beta catalyst prepared using the method provided by the present invention exhibits high activity, selectivity and stability when applied to the reaction of caprolactam prepared from caprolactone via gas-solid phase hydroamination.

The invention discloses superfine copper powder and a preparation method thereof, and relates to the technical field of copper powder preparation. The method comprises the following steps: preparing a copper-containing compound into a solution, and adding a pH regulator to obtain a system A; and adding an additive and a reducing agent to obtain a system B, reacting at 50-90 DEG C, filtering, washing and drying to obtain the superfine copper powder. The invention provides a low-temperature normal-pressure liquid-phase reduction preparation technology for the superfine copper powder, the method is simple, the cost is low, and the morphology and size of the micro-nano copper powder can be effectively controlled by adjusting the types, the content and the reaction conditions of all the reaction raw materials. The problems that in the prior art, the copper powder preparation process is complex, and the conductivity of a product is poor are solved.

The invention discloses a method for preparing nano copper powder based on a microwave-assisted reduction method and application. The method comprises the following steps: a) preparing a copper ion solution; b) adding a dispersing agent and a surfactant; c) adding a reducing agent; d) microwave heating reaction; e) separating and purifying a product; and f) drying. According to the method, directional reduction and morphology regulation and control of copper ions are achieved through the synergistic effect of a microwave field and chemical reduction, the specific surface area of the obtained product reaches 25-35 m < 2 > / g, the oxygen content is lower than 0.8 wt%, and excellent performance is shown in the fields of electronic packaging and conductive ink; the method has the characteristics of short reaction time (shortened by 90% compared with the traditional method), low energy consumption (less than 0.5 kWh / kg), no harmful by-product and the like, and meets the requirements of green chemical industrial production.

The invention belongs to the technical field of electronic materials, and particularly relates to a preparation method of a copper powder enhanced terahertz composite wave-absorbing film. The preparation method comprises the following steps: by taking polyurethane modified epoxy resin as a raw material, sequentially adding silane coupling agent modified aluminum oxide, chitin coated silicon dioxide and substituted thiophenol self-assembled nano-copper powder, stirring, then adding a curing agent and a dispersing agent to obtain a mixed solution, then pouring the mixed solution into a coating machine, and coating to obtain the coating. Preparing a copper powder enhanced terahertz composite wave-absorbing film; the minimum wave-absorbing efficiency of the thin film in the frequency band of 0.3-3.0 THz is-26.7 dB, and the effective bandwidth with the wave-absorbing efficiency smaller than-10 dB is the full frequency band; the composite wave-absorbing material can be used for wave-absorbing electromagnetic protection of 6G electronic devices.

The invention relates to the technical field of solar cells, and particularly discloses conductive paste for a solar cell, a preparation method of the conductive paste and an electrode. The conductive paste for the solar cell comprises the following components in percentage by weight: 88%-92% of carbon-based nano-copper particles, 4%-6% of glass powder and 4%-6% of an organic additive, the carbon-based nano-copper particles are prepared by reacting copper chloride with glucose and then calcining, the particle size is 52-100nm, and copper oxidation is inhibited by using a carbon layer; the organic additive is composed of a stabilizer, resin and an organic solvent according to a ratio of 1: 3: 9. The conductive material is prepared by mixing, dispersing, grinding and filtering, and can be prepared into a solar cell conductive material by silk-screen printing and high-temperature sintering. The conductive paste is low in cost, high in oxidation resistance and excellent in conductivity, and can replace silver paste to reduce the manufacturing cost of the solar cell, improve the performance and prolong the service life.

The invention discloses a preparation method of a magnesium alloy corrosion-resistant thermal control coating, and relates to the technical field of metal surface treatment. The preparation method comprises the following steps: carrying out numerical control laser texturing treatment on the surface of the magnesium alloy with an oxide film removed; the magnesium alloy subjected to numerical control laser texturing treatment serves as an anode, micro-arc oxidation treatment is conducted, and a micro-arc oxidation coating is formed on the surface of the magnesium alloy so as to improve the corrosion resistance and thermal control performance of the magnesium alloy; wherein the electrolyte additive is nano copper oxide subjected to irradiation modification treatment. According to the method, the magnesium alloy surface is subjected to laser texturing treatment, so that more regular and ordered holes are formed in the magnesium alloy surface, the activity and roughness of the magnesium alloy surface are improved, on one hand, the thermal control performance of the micro-arc oxidation coating is improved, and on the other hand, the microstructure uniformity of the micro-arc oxidation coating is improved; the porosity of the micro-arc oxidation coating is remarkably reduced, and the corrosion resistance of the micro-arc oxidation coating is improved.

The invention discloses a graphene reinforced Al-Cu composite material and a preparation method and application thereof, and belongs to the technical field of metal matrix composite materials and preparation thereof. The problems that in an existing graphene reinforced aluminum matrix composite, graphene is poor in dispersity in an aluminum matrix, and harmful interface reaction is serious at the high temperature are solved. According to the preparation method, the surface of aluminum powder is plated with nano-copper particles through chemical plating, the potential of the aluminum powder in a water medium is regulated and controlled through a copper plating layer on the surface, the surface of the aluminum powder is provided with positive charges, graphene can be evenly dispersed in a matrix through electrostatic self-assembly, and meanwhile the surface copper plating layer is used for inhibiting interface reaction and hindering generation of a brittle phase. In addition, by adding the metal copper, the solid solution and second phase strengthening effects can be achieved, and the mechanical property of the composite material is further improved.

The invention provides a long-acting antibacterial self-cleaning hardening PET film and a preparation method thereof. The method comprises the following steps: S1, preparing a copper deposition nano zinc oxide antibacterial material, S2, preparing an antibacterial-hardening composite material which is modified silicon dioxide or porous aluminum oxide, and S3, preparing a hydrophobic and oleophobic self-cleaning antibacterial-hardening composite material. According to the antibacterial material, through the synergistic effect of the antibacterial property of nano-zinc oxide and the antibacterial property of nano-copper elementary substance, the antibacterial effect of the PET film is remarkably improved, and the antibacterial effect is long-acting and lasting; the modified porous silicon dioxide or porous aluminum oxide is a high-hardness compound, the hardness and the wear resistance of the PET film can be obviously improved, and the antibacterial material is loaded in holes of the hardening material, so that the antibacterial-hardening composite material has the antibacterial property and does not affect the hardness of the hardening material at the same time; due to the preparation of the hydrophobic and oleophobic self-cleaning material, the composite material has self-cleaning, long-acting antibacterial and hardening effects, and can meet the application requirements of a highly-functionalized PET film.

The present disclosure provides a high-temperature resistant nano-copper produced by laser direct writing, a preparation method and an application thereof. The high-temperature resistant nano-copper exhibits excellent oxidation resistance, thermal stability and superior conductivity. In this disclosure, the preparation is simple, and the nano-copper oxide ink can be stored for extended periods without being affected by oxidation. It is suitable for various manufacturing processes including printing, coating, and other similar methods. Moreover, based on laser direct writing, the processing efficiency is high, enabling the one-step integration of multi-performance of the high-temperature resistant nano-copper. The high-temperature resistant nano-copper described in the present disclosure can be used as an interconnection circuit in an integrated sensor system based on all-laser in-situ direct writing, and can be widely applied in fields of aerospace, automobile, electronics, etc.

The invention provides nanoscale superfine copper powder and a preparation method thereof, and belongs to the technical field of metal powder, the preparation method comprises the following steps: dispersing copper salt and a complexing agent in deionized water to obtain a copper salt solution; dispersing a reducing agent and a dispersing agent in deionized water to obtain a reducing solution; dispersing sodium hydroxide in deionized water to obtain a sodium hydroxide solution; the method comprises the following steps: heating a copper salt solution, a reduction solution and a sodium hydroxide solution to 45-80 DEG C, adding the reduction solution into the copper salt solution under a stirring condition, then adding the sodium hydroxide solution to obtain a mixed solution, and reacting for 2-3 hours; and after the reaction is finished, a suspension containing copper powder is obtained, and after solid-liquid separation, washing and drying are conducted, the nanoscale superfine copper powder is obtained. The method is simple in technological process, does not need special equipment and is suitable for industrial production. And the prepared nano copper powder is good in dispersing performance, uniform in particle size distribution, high in purity and suitable for being applied to the field of microelectronic components.

The present disclosure provides a method for preparing nano copper oxide flakes, and relates to the technical field of metal powder nanomaterial preparation. The method comprises: configuring copper salt into a copper precursor aqueous solution containing a surfactant, and configuring alkali into an alkaline solution; converting the copper precursor aqueous solution containing a surfactant into a copper micro-nano aerosol containing a surfactant, and converting the alkaline solution into an alkali-containing micro-nano aerosol; performing a gas phase confined micro-region mixing pre-reaction on the copper micro-nano aerosol containing a surfactant and the alkali-containing micro-nano aerosol to obtain a copper-alkali mixed solution, and transferring the copper-alkali mixed solution to a polytetrafluoroethylene reactor for hydrothermal reaction to obtain a nanoparticle solution containing a copper compound; performing solid-liquid separation, washing, drying and roasting on the nanoparticle solution containing a copper compound to obtain a nano copper oxide flake. The present disclosure reduces the preparation cost of the nano copper oxide flake on the basis of improving the preparation efficiency of the nano copper oxide flakes.

The invention relates to the technical field of metal nano-material preparation, in particular to a method for green synthesis of nano-copper through a black rice extracting solution and application thereof.The method comprises the steps that black rice powder and distilled water are mixed for extraction, and the black rice extracting solution is obtained; when it is judged that the preparation of the black rice extracting solution does not reach the standard according to the absorbance, the heating and extracting temperature is increased synchronously; diluting the black rice extracting solution, and mixing the diluted black rice extracting solution with a CuSO4 solution for reaction to obtain a nano-copper solution; when it is judged that the preparation of the nano-copper solution does not reach the standard according to the particle size uniformity characteristic value of the nano-copper, whether the preparation of the nano-copper solution reaches the standard or not is secondarily judged according to the density of the nano-copper solution, or the stirring speed is increased; the standard nano-copper solution is centrifuged, washed, dried in vacuum and sieved to obtain the nano-copper, and when it is judged that preparation of the nano-copper does not reach the standard according to the weight ratio, the centrifugal rotating speed is reduced, and the preparation quality of the nano-copper is improved.

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.

The invention discloses a marine antifouling and anticorrosive coating with copper ion controllable release and self-repairing functions and a preparation method of the marine antifouling and anticorrosive coating, and belongs to the technical field of marine equipment antifouling and anticorrosive coatings. In order to solve the problems that a traditional copper-based antifouling coating is too fast in initial release of copper ions, poor in antifouling persistence, easy to damage and difficult to give consideration to antifouling and self-repairing performance, the preparation method comprises the following steps: firstly, preparing a KH560 modified nano copper oxide / activated carbon antifouling agent; controllable release of copper ions is achieved through the adsorption effect of activated carbon and interface modification of KH560. Secondly, taking PTMG and TDI as raw materials, and introducing FDME and BMI to construct a self-repairing polyurethane matrix containing reversible covalent bonds and hydrogen bonds; finally, the antifouling agent is introduced into the self-repairing polyurethane matrix according to a specific proportion, and the composite coating is prepared. According to the invention, long-acting controllable release of copper ions and synergistic improvement of self-repairing and corrosion resistance of the coating are realized, and the coating is suitable for long-term protection of marine equipment.

The invention relates to lead-free glass-coated copper powder for an HJT photovoltaic cell, conductive copper paste and a preparation method of the lead-free glass-coated copper powder and the conductive copper paste, the glass-coated copper powder comprises nano-copper powder and a coating layer on the surface of the nano-copper powder, and the coating layer is composed of bismuthate glass. According to the preparation method, a sol-gel method is adopted, the bismuthate glass is coated on the nano copper powder, the glass and the copper powder form a core-shell structure, the glass can be molten into a liquid phase during sintering, the contact between the glass and the copper powder is more uniform, and the oxidation resistance of the copper powder is enhanced. The prepared glass-coated copper powder can effectively isolate the copper powder from being in contact with an external oxidizing agent, excellent anti-oxidation protection is provided, the rapid oxidation point of the copper powder is increased by 100-150 DEG C compared with the rapid oxidation point of the copper powder before coating, and the service life of the copper powder is prolonged; meanwhile, the conductive copper paste has high stability, high reliability, low cost and high conductivity, and meets the environmental protection requirement.

The invention discloses a production process and application of a piece of cleaning cloth capable of being torn off, nano silicon dioxide and a water-repellent additive are added in the preparation process, and the cleaning cloth has excellent waterproof and anti-pollution performance. Water drops are not easy to attach to the surface of the cloth, stains are not easy to permeate, the cloth can be kept in a cleaning state for a longer time, the service life of the cloth is greatly prolonged, the cleaning efficiency of the cloth is greatly improved, antibacterial components such as nano-silver and nano-copper are used in the preparation process of the cloth, the components can effectively inhibit growth of bacteria and fungi on the surface of the cloth, and the antibacterial effect is good. And the risk of bacterial cross contamination is reduced. The cleaning cloth subjected to antibacterial treatment can effectively prevent bacteria from breeding on the cloth, high cleaning efficiency is ensured, and the cleaning cloth is particularly suitable for occasions with high sanitary requirements such as medical treatment and food processing.