630 results about "Silver ion" patented technology

The invention discloses silver powder with a high twin crystal ratio and a preparation method and application of the silver powder with the high twin crystal ratio. The preparation method comprises the following steps that S1, a carboxylic acid coordination agent is added into a silver source solution, and a silver precursor solution is obtained; sequentially adding a dispersing agent and an initiator into the reducing agent solution to obtain a reaction base solution; s2, a silver precursor solution is added into the reaction base solution for an oxidation-reduction reaction, then curing is conducted, and mixed mother liquor is obtained; s3, the mixed mother liquor is filtered, washed, dispersed and dried, and then the silver powder with the high twin crystal proportion is obtained; the initiator comprises one or more of sulfate, carbonate and nitrate; through the synergistic effect of the initiator and the carboxylic acid coordination agent, the silver ion release rate and the crystal nucleus preferential growth direction are regulated and controlled, the rapid feeding and curing technology is combined, the low supersaturation environment is constructed, the silver powder is induced to grow in the specific direction, and the twin crystal proportion is remarkably increased.

The invention relates to the technical field of material detection, in particular to a silver coating adhesive force detection method based on multi-frequency impedance imaging, which comprises the following steps: applying a dual-mode multi-frequency excitation signal to the surface of a silver coating through an attached microelectrode array, synchronously acquiring voltage-current response data, and generating a dual-mode multi-frequency impedance original data set; performing time-varying impedance phase-locked separation on the dual-mode multi-frequency impedance original data set, extracting a dynamic impedance component of a coating-matrix interface region, and reconstructing a three-dimensional sub-interface impedance distribution diagram; and outputting an adhesive force quantized value through an oscillation frequency-adhesive force conversion model according to the spatial oscillation frequency characteristics of the impedance phase in the three-dimensional sub-interface impedance distribution diagram. According to the invention, a double-phase-locked loop system is adopted to realize the time-varying component demodulation of the impedance response of the silver coating-matrix interface, the low-frequency dynamic impedance signal modulated by silver ion migration is effectively extracted, and the weak change of the interface bonding state is sensitively reflected.

The invention discloses a method for biologically leaching a retired ternary lithium battery positive electrode material under the catalysis of silver ions, which comprises the following steps of: (1) discharging, roasting, disassembling and grinding a retired ternary lithium battery to obtain ternary lithium battery positive electrode material powder; (2), Acidithiobacillus ferrooxidans is inoculated into the culture medium, and when the redox potential in a culture system is larger than or equal to 600 mV, a bacterial culture solution is obtained; and (3) adding the waste ternary lithium battery positive electrode powder into a bacterial culture solution, then adding a silver nitrate solution for leaching, and culturing for 3-7 days to obtain a biological leaching solution. According to the method, the biological leaching rate of metal is increased through silver ions, operation is easy and convenient to implement, the catalyst is simple and easy to obtain, the production cost is low, and environmental pollution is small, and the method has good application prospects.

The invention provides high-filling silver powder and a preparation method thereof, and belongs to the field of metal powder.The preparation method comprises the steps that a nano-silver solution is prepared, a dispersing agent and a first reducing agent are mixed to obtain a mixed solution, the nano-silver solution and the mixed solution are mixed in a constant-temperature stirring state to obtain a base solution, a second reducing agent solution and a silver nitrate solution are prepared respectively, and the high-filling silver powder is prepared. And under the constant-temperature stirring state, the second reducing agent solution and the silver nitrate solution are synchronously added into the base solution, a silver powder solution is obtained through reaction, the silver powder solution is subjected to washing, solid-liquid separation, drying and depolymerization shaping treatment, and the high-filling silver powder is obtained. Controllable preparation of the large-size sphericity silver powder is achieved by controlling the particle size and the adding amount of the nano-silver, regulating and controlling heterogeneous nucleation and growth sites of silver ions and inhibiting formation of multistage dendritic crystals, surface charges and steric hindrance effects of silver particles are optimized through the surface adsorption effect of the dispersing agent, the agglomeration phenomenon of the silver powder in the growth process is reduced, and the silver powder is prepared. And meanwhile, the silver powder is endowed with excellent flowability.

The invention relates to a metallized microbubble and a preparation method thereof, a construction method of a multifunctional composite probe, and a rapid bacterium capturing and sterilizing method, and belongs to the technical field of functional material preparation. The method aims at solving the technical problems that in the prior art, a metal coating on the surface of the hollow glass microbubble is not uniform, combination is not firm, and stability is poor. According to the technical scheme, the method is characterized by comprising the following steps: mixing surface-activated hollow glass microbubbles with a polyethyleneimine solution for reaction, and washing and drying to obtain polyethyleneimine-coated hollow glass microbubbles; then reacting with a single-stranded DNA buffer solution to obtain an intermediate product loaded with DNA; then introducing a silver nitrate solution to load silver ions on the surface of the compound; and finally, reducing through a sodium borohydride solution to prepare the metallized microbubbles. The metalized microbubbles prepared by the method can be used for constructing a multifunctional composite probe to realize efficient capture and synergistic antibiosis of targets such as bacteria.

The invention discloses a paper-based composite film, which adopts a four-layer structural design, and the outer layer is an ultraviolet shielding layer formed by coating TiO2 with lignin; the transition layer is composed of 32-64 PLA / PBAT alternating microlayers, and the multiple alternating transition layers form a zigzag gas barrier path; ag-coated ZIF-8 nanoparticles are loaded on the paper base layer, so that long-acting antibiosis is realized by slowly releasing silver ions; and the inner layer adopts a PPC / PBS blend to support the heat sealing layer with adjustable heat sealing strength. According to the preparation process, a gradient micro-layer structure is constructed through a multi-runner co-extrusion die head and a layer multiplier, silver ions are loaded to ZIF-8 through an ultrasonic-vacuum impregnation process, the hydroxyl density of the surface of the paper base layer is improved through plasma treatment, good interlayer strength is achieved, ester bond crosslinking is induced in a pre-irradiation mode, and the product is prepared. The paper-based composite film has ultraviolet shielding, gradient blocking, slow-release antibacterial and controllable heat sealing performance, the interface bonding strength of a traditional paper-based composite film is greatly improved, all components are biodegradable, and the paper-based composite film is suitable for packaging of food, medicine and the like.

The invention relates to the technical field of titration detection in analytical chemistry, in particular to a thymol phenolphthalein-TBPE composite indicated cyanide high-precision detection method which comprises the following steps: step 1, after a water sample to be detected is distilled and separated, adjusting the pH value of distillate to a strong alkaline environment required by thymol phenolphthalein color development; 2, adding a composite indicator containing thymol phenolphthalein and tetrabromo phenolphthalein ethyl ester, wherein the mass ratio of the two components in the composite indicator is determined through a color change sensitivity optimization experiment; step 3, titrating with a silver nitrate solution, and judging an end point according to three-order color mutation: the initial state is light yellow, the intermediate state is green, and the end point state is purple red; and 4, adding an auxiliary masking agent before titration, and blocking the reaction between the auxiliary masking agent and silver ions by preferentially complexing interference ions. By optimizing the ratio of the composite indicator and using the masking agent, interference of other substances can be effectively prevented, and accurate detection of cyanide is ensured.

The invention discloses a method for recovering precious metal from refining wastewater, and relates to the technical field of wastewater resourceful treatment. Comprising the following steps: adding a porous carbon-based composite material into the acidic silver-containing refining wastewater, and stirring for adsorption to obtain an adsorption solution; the porous carbon-based composite material adsorbing the silver ions is recycled in a filtering or centrifugal separation mode; the porous carbon-based composite material adsorbing the silver ions makes contact with a desorption agent, desorption treatment is conducted, and a regenerated porous carbon-based composite material and a silver-containing desorption solution are obtained through separation; and a reducing agent is added into the silver-containing desorption solution, and silver ions are reduced into elemental silver to be recycled. The precious metal silver in the refining wastewater is recovered by adopting an adsorption method, and the recovery rate of the silver is relatively high.

The present invention discloses a tellurium-lead-lithium oxide glass powder for BC cell N-region conductive paste and its preparation method, belonging to the field of photovoltaic silver paste. The glass powder adopts components with high Pb, Te, and Li: aTeO2 - bPbO - cLi2O - dBi2O3 - eWO3 - fZnO - gSiO2 - hNa2O; where a + b + c + d + e + f + g + h = 1, 0.2 < a < 0.4, 0.1 < b < 0.4, 0.1 < c < 0.25, 0 < d < 0.1, 0 < e < 0.1, 0 < f < 0.1, 0 < g < 0.1, 0 < h < 0.05, and a + b > 0.5, and the ratio of c to h is (3 - 10):1. By controlling the specific Pb, Te, and Li contents and the specific Li / Na ratio in the present invention, a strong corrosion effect on the poly layer of the cell is achieved, enabling more silver ions dissolved in the glass liquid to recrystallize on the surface of the silicon wafer, thereby achieving good ohmic contact.

The invention discloses silver-coated copper particles, a preparation method thereof and application of the silver-coated copper particles in sintering slurry. The invention belongs to the field of sintered materials. The problem that in the prior art, the sintering temperature of high-temperature welding flux is high is solved. According to the silver-coated copper particles, a multi-step chemical synthesis method is adopted, firstly, silver-coated copper particle suspension is prepared, and then a silver complexing solution, a second chelating agent solution and a complexing agent solution are used for regulating and controlling the release and reduction rate difference of silver ions, so that gradient structure evolution of a silver layer from a compact structure to a porous structure is achieved; the surfaces of the silver-coated copper particles have multistage pore structures, so that the contact resistance among the particles can be effectively reduced, the sintering initial temperature is effectively reduced, the problem of poor oxidation performance of the copper particles is solved, the use amount of silver is reduced, the manufacturing cost is reduced, the ion migration path length is increased, and the electromigration life is prolonged; the prepared silver-coated copper particles greatly meet the requirements of the current electronic packaging field for novel welding materials, and have remarkable social benefits and economic benefits.

The invention discloses an antibacterial polyolefin composite pipe and a preparation method thereof, and belongs to the technical field of polymer pipes. The antibacterial polyolefin composite pipe comprises an inner layer and an outer layer, wherein the inner layer comprises the following components in parts by mass: 88-95 parts of polypropylene random copolymer, 3-6 parts of an antibacterial agent, 3-6 parts of a compatilizer and 0.1-1 part of an antioxidant; the antibacterial agent comprises silver ions and an antibacterial carrier, and the antibacterial carrier comprises sulfonated graphene oxide and a metal type imidazolate skeleton. The antibacterial agent is introduced into the inner layer, the antibacterial agent is compounded by an antibacterial carrier and silver ions, precipitation of silver can be effectively slowed down, the initial antibacterial effect of the polyolefin composite pipe is guaranteed, meanwhile, the antibacterial durability of the polyolefin composite pipe is improved, breeding of microorganisms such as bacteria can be effectively inhibited under the actual working condition of tap water, and the service life of the polyolefin composite pipe is prolonged. Therefore, a pipeline system of the polyolefin composite pipe is suitable for conveying drinking water for a long time.

A silver ion sterilizing liquid preparation system comprises a water inlet pretreatment system and a silver ion sterilizing liquid generation system, the water inlet pretreatment system comprises a water inlet channel, a water outlet channel and a filtering device, the water inlet channel is communicated with a raw water source, and the filtering device is communicated with the water inlet channel and the water outlet channel; filtering the raw water source to generate filtered water; the silver ion sterilizing liquid generating system is used for reacting with the filtered water to generate silver ion sterilizing liquid; the silver ion sterilizing liquid generating system comprises a silver ion generating water tank and a silver ion sterilizing liquid storage tank; an electrolysis device is arranged in the silver ion generation water tank and comprises a silver anode and a silver cathode, the silver ion generation water tank is communicated with the water outlet channel, the filtered water enters the silver ion generation water tank, and the silver anode and the silver cathode are subjected to an electrolytic reaction to generate a silver ion sterilizing solution; the silver ion sterilizing liquid storage tank is communicated with the silver ion generating water tank so as to store silver ion sterilizing liquid generated in the silver ion generating water tank, and the silver ion sterilizing liquid preparation system further comprises a control system; the control system is used for adjusting the water flow path and starting and stopping of the inlet water pretreatment system and the silver ion sterilization liquid generation system according to the liquid level and the electrolysis time.

This invention discloses a method for preparing ultrafine spherical silver-coated copper powder. A dense film is formed on the surface of copper powder using a specific activator, and this film can quickly form a complex with silver ions in the solution. At the same time, under the action of a specific reducing agent, silver ions are reduced to fine silver nanoparticles and adsorbed on the surface of copper powder. Silver ions in the solution form a dense silver layer on the surface of copper powder through two-dimensional nucleation, resulting in silver-coated copper powder with high density, high conductivity, and high oxidation resistance.

The invention provides a preparation method of silver-coated copper powder, and belongs to the technical field of metal powder treatment. The used copper particle suspension contains a complexing agent, so that the activity of the copper particles can be reduced, the reaction rate of reduction coating can be reduced when a silver-ammonia complexing solution is added, and a compact silver layer slowly and uniformly grows on the surface of each copper particle; the reduction of the activity of the copper particles slows down the replacement reaction of silver ions and copper, and the situation that the coating surface is rough and loose due to the generation of overlarge silver particles is avoided; the silver grows slowly and compactly, so that the surface of the coated silver layer is smooth and compact on the basis of lower usage amount of the silver source; the preparation method is simple in process, low in silver content and low in production cost, and the coated silver layer is smooth and compact in surface.

The present invention discloses a method for preparing silver powder and a nanostructure on the surface of the silver powder. The preparation method comprises the following steps: (1) mixing micron silver powder, a nanosilver seed solution, an organic solvent, and a binder to form a mixture solution; preparing a complex silver ion solution and a reducing agent solution; wherein the binder is an organic acid containing a carbon-oxygen double bond and a hydroxyl group, and the complex silver ion solution is a silver ion solution containing a complexing agent, wherein the silver ions exist in a complexed state; (2) mixing the complex silver ion solution, the reducing agent solution, and the mixture solution to react, so that newly generated silver is formed on the surface of the micron silver powder and wraps the surface of the micron silver powder; (3) after the reaction is completed, separating and obtaining silver powder, washing, filtering, and drying to obtain a silver powder product. The present invention achieves a higher coverage rate of subsequent surface nanostructured silver powder by all-round coating of silver particles, thereby obtaining a silver powder product with high sintering activity.

The invention provides application of a silver modified AFX molecular sieve in xenon and krypton gas separation, and belongs to the technical field of gas separation. According to the invention, silver ions with electronegativity are introduced into AFX molecular sieve pores through ion exchange, selective adsorption of xenon is realized through the AFX topological molecular sieve subjected to Ag exchange so as to enrich xenon, and excellent separation of xenon and krypton is finally realized. The xenon and krypton adsorption isotherm of the silver modified AFX molecular sieve under the condition of 25 DEG C is tested, and the IAST (ideal adsorption solution theoretical value) of the molecular sieve is analyzed to be 36.5 through a static adsorption curve; according to the method disclosed by the invention, a dynamic penetration test is carried out under trace Xe and Kr concentrations by simulating the waste gas subjected to UNF post-treatment, and the dynamic capacity of Xe is calculated to be 104 mmol kg <-1 >, which is superior to that of other reported materials.

The invention relates to the technical field of food packaging, in particular to a bacteriostatic aluminum foil material for a meal box and a preparation method thereof. The material is subjected to aluminum foil surface activation, then is sequentially impregnated in a sol impregnation liquid and an outer layer coating liquid, is subjected to dip coating, and finally is subjected to ultraviolet curing to obtain a multi-layer composite structure. The middle layer is made of an aminated organic silicon material and is firmly combined with the aluminum base material and the outer layer resin through chemical bonds, so that the adhesive force of the coating is remarkably improved. The outer coating is added with a phenyl triazole modified layered double hydroxide loaded nano-silver antibacterial agent, so that slow release and efficient broad-spectrum antibacterial property of silver ions are realized, the thermal stability is improved, and reliable performance under a high-temperature condition is ensured. The multilayer design and multiple antibacterial mechanisms have a synergistic effect, the problems of poor antibacterial durability, insufficient adhesive force, low heat resistance and the like of a traditional lunch box aluminum foil material are effectively solved, meanwhile, food safety is considered, and the aluminum foil material is suitable for the field of modern high-requirement food packaging.

This invention discloses a plant-mediated green synthesis method for silver-cerium oxide-attapulgite multifunctional composite nanoenzymes. The method involves mixing cerium nitrate and silver nitrate with an attapulgite suspension, adding honeysuckle extract, adjusting the pH, heating the reaction mixture, centrifuging, washing, drying, and then calcining under a nitrogen atmosphere to obtain the silver-cerium oxide-attapulgite multifunctional composite nanoenzyme. Cerium ions form a complex with the active ingredients in the honeysuckle extract and bind to attapulgite via hydrogen bonds. Calcination yields cerium oxide nanoparticles, while silver ions are reduced by the honeysuckle extract to obtain silver nanoparticles. This invention features a green and environmentally friendly preparation process, simple operation, and easy scale-up. The resulting nanocomposite material exhibits pH-responsive antibacterial and antioxidant multienzyme activity and can be used as an anti-drug-resistant nanomaterial in biomedicine and other fields.

The application discloses a kind of high-conductivity MXene-based electromagnetic shielding composite films and preparation method thereof, belong to new material technical field.The preparation method includes the following steps: using in-situ HF etching method to prepare MXene dispersion liquid;With deionized water as solvent, silver nitrate solution is prepared by dissolving silver nitrate;The silver nitrate aqueous solution is added to MXene dispersion liquid, and Ag@MXene film is obtained by vacuum filtration method.The method uses silver ion in silver nitrate as oxidant to make it and titanium element in MXene occur redox reaction to generate silver particles, so as to prop up MXene sheet layer and reduce the resistance caused by adhesion between sheet layers and increase the conductive path in MXene, so as to increase the conductivity of MXene;The composite film not only has excellent conductivity, electromagnetic shielding performance and is easy to form processing;The conductivity of the composite film can reach 3120S / cm, and the electromagnetic shielding performance can reach 68.5dB.

The application discloses a machine learning enhanced silver-based covalent organic framework nanoscale enzyme colorimetric detection method and application thereof, and constructs a covalent organic framework loaded with silver nanoparticles to form a nanoscale enzyme with oxidase-like activity, which is used for rapid visual detection of mercury ions. When mercury ions exist, silver ions in the COF-AgNPs can form silver amalgam with the mercury ions, thereby catalyzing the colorless substrate 3,3',5,5'-tetramethylbenzidine to generate a blue oxidation product oxTMB. The content of mercury can be judged by detecting the absorbance and RGB value changes of the color development reaction. Meanwhile, a machine learning data analysis strategy of a support vector machine model is adopted to perform five-fold stratified cross-validation analysis on the obtained absorbance and RGB values, so that the detection range is expanded and the detection sensitivity is improved.

The invention relates to the technical field of composite metal materials, in particular to a silver-coated graphene copper composite material and a preparation method thereof, and aims at solving the problems that traditional silver-coated copper powder is high in silver consumption, copper is oxidized due to the fact that a silver layer is prone to being damaged, and conductivity is insufficient. The method comprises the steps that a graphene coating layer is formed on a copper powder substrate in situ through chemical vapor deposition, and graphene copper powder is obtained; performing etching treatment on the graphene copper powder to controllably expose part of the copper substrate so as to form anchoring points for silver ion deposition; carrying out reduction treatment on the etched graphene copper powder so as to ensure that an anchoring site has chemical activity; in a reductive liquid phase environment, enabling a chemical silver plating solution to react with the graphene copper powder subjected to reduction treatment, and guiding silver ion deposition by utilizing an anchoring point, so as to form a silver coating layer on the surface of the graphene coating layer; and separating and drying the reacted system to obtain the silver-coated graphene copper composite material. The material is better in oxidation resistance and conductivity, and the process is free of waste liquid.

The invention relates to the technical field of hydrogel, in particular to a preparation process of antibacterial hydrophilic hydrogel and application of the antibacterial hydrophilic hydrogel in organoid tissue engineering. The preparation process comprises the following steps: S1, preparing a base material; the base material is prepared from the following raw materials in parts by weight: 300 to 400 parts of deionized water, 60 to 80 parts of acryloyloxyethyl trimethyl ammonium chloride, 40 to 60 parts of polyoxyethylene, 20 to 30 parts of antibacterial agent, 6 to 10 parts of methyl methacrylate and 1 to 3 parts of photoinitiator 1173. According to the preparation method, the contact area between the silver nanoparticles and bacteria is increased, cell membranes are damaged, silver ions are released, chitosan and beta-sodium glycerophosphate form a temperature-sensitive gel precursor after being dissolved, and due to the fact that chitosan carries positive charges, the bacteria can be adsorbed and cell walls can be damaged through the electrostatic interaction; the chitosan and the silver nanoparticles form a slow-release carrier, so that the release time of silver ions is prolonged, and the antibacterial property of the antibacterial hydrophilic hydrogel is further improved.

The invention discloses a pH / temperature dual-response type quaternary ammonium salt-nano silver-zinc oxide composite antibacterial coating material as well as a preparation method and application thereof, and belongs to the technical field of antibacterial materials. The antibacterial effective life of the coated product is at least up to 5 years. The coating product is preferably a gastrointestinal endoscope, efficient bacteriostasis is achieved under the condition that the light transmittance of the gastrointestinal endoscope is not affected, biocompatibility is good, safety is high, precise controlled release of silver ions is achieved, and biotoxicity caused by sudden release of the silver ions is avoided. The quaternary ammonium salt-nano silver-zinc oxide composite coating material with the pH / temperature dual-response antibacterial effect is finally obtained through the steps of preparing a composite carrier material, loading antibacterial metal elements, constructing a pH / temperature dual-response polymer network and the like in sequence. A high-performance, safe and environment-friendly antibacterial coating system which is rapid in sterilization, precise in controlled release and long-acting in interference resistance is constructed, and an antibacterial solution with high technical adaptability is provided for the fields of medical treatment, food, water treatment and the like.

The invention relates to a silver nanowire preparation technology, and aims to provide a method for preparing a high-length-diameter-ratio silver nanowire in one step through a solvothermal synthesis reaction. Comprising the following steps: mixing and stirring silver ions and a PVP (Polyvinyl Pyrrolidone) solution, continuously adding bromide ions and chloride ions serving as a nucleating agent, and mixing and stirring to obtain a reaction solution; transferring the reaction solution into a hydrothermal reaction kettle, and reacting under a heating condition to obtain a silver nanowire mother solution; and sediments in the silver nanowire mother liquor are separated and cleaned, and the silver nanowires with the length-diameter ratio being 2148-3190 are obtained. By means of a cooperative regulation mechanism of bromide ions, chloride ions and polyvinylpyrrolidone, the problem that in existing research work, the length and the diameter of the silver nanowire are difficult to consider at the same time is solved, and it is ensured that the length of the silver nanowire is maintained while the diameter of the silver nanowire is reduced; the technological process is simplified, and the problems of nitrogen atmosphere reaction, secondary heating and the like in the prior art are solved; and by optimizing all reaction parameters, stable and controllable preparation of the silver nanowire with the high length-diameter ratio is finally achieved.

The invention discloses a machine learning enhanced silver-based covalent organic framework nano-enzyme colorimetric detection method and application thereof, and constructs a nano-enzyme which is formed by loading silver nanoparticles on a covalent organic framework and has oxide-like enzyme activity, and the nano-enzyme is used for rapid visual detection of mercury ions. When mercury ions exist, silver ions in the COF-AgNPs can form silver amalgam with the mercury ions, so that a colorless substrate 3, 3 ', 5, 5'-tetramethyl benzidine is catalyzed to generate a blue oxidation product oxTMB. And the mercury content can be judged by detecting the absorbance and RGB value change of the chromogenic reaction. And meanwhile, a machine learning data analysis strategy of a support vector machine model is adopted to carry out five-fold layered cross validation analysis on the obtained absorbance value and RGB value, so that the detection range is expanded, and the detection sensitivity is improved.

The invention discloses a hydrophobic anti-icing material based on silver ions and application in a power transmission line, and belongs to the technical field of hydrophobic anti-icing materials, the hydrophobic anti-icing material is prepared from the following raw materials in parts by weight: 80-120 parts of hydroxyl-terminated polydimethylsiloxane, 5-15 parts of tetraethoxysilane, 0.5-3 parts of silver nitrate, 3-10 parts of hydrophobic nano silicon dioxide and 1-5 parts of nano titanium dioxide. The invention discloses an anti-icing and deicing composite material, which is prepared from the following components in parts by weight: 80 to 120 parts of butyl acetate, 0.1 to 0.5 part of dibutyltin dilaurate, 0.5 to 2 parts of sodium citrate and 2 to 5 parts of modified fluorinated phosphotungstic acid imidazole compound, and solves the problems that the existing material is insufficient in photo-thermal utilization rate, poor in stability in a severe environment, insufficient in hydrophobic capacity and difficult to give consideration to anti-icing and deicing effects. According to the scheme, the modified fluorinated phosphotungstic acid imidazole compound and silver ions are introduced to form a synergistic effect, formation of an ice layer is inhibited, melting of the ice layer is promoted, meanwhile, lasting super-hydrophobicity is provided, a durable hydrophobic anti-icing coating based on the silver ions is formed, and the safety of a power grid is guaranteed.

The invention discloses a silver-based electromagnetic shielding coating layer and a preparation method thereof, and belongs to the technical field of electromagnetic shielding materials. The coating layer comprises the following components in parts by mass: 30-50 parts of composite modified polystyrene silver-loaded microspheres, 80-150 parts of epoxy resin, 15-40 parts of a polyether amine epoxy curing agent, 0.5-2 parts of a defoaming agent and 0.5-2 parts of a flatting agent, and the coating layer is obtained by mixing all the components, coating the insulating carrier with the mixture and curing. The composite modified polystyrene silver-loaded microspheres are prepared by modifying sulfhydrylated polystyrene microspheres with trimethylpropane monoallyl ester, modifying with histidine, quaternizing, loading with phosphotungstic heteropoly acid and carrying out reduction loading with silver ions. The phosphotungstic heteropoly acid anchors silver ions to form a uniform and compact silver layer, and the silver-loaded microspheres form a three-dimensional conductive network to ensure the shielding effectiveness; the organic modified layer and the epoxy resin matrix form strong interface combination to avoid agglomeration and sedimentation; the oxidation resistance is improved through a multi-barrier structure, the quaternary ammonium salt has the antibacterial property, and high conductivity, excellent oxidation resistance, good matrix compatibility and shielding stability are achieved.

The invention relates to the technical field of immunochromatography analysis, and discloses a signal enhancer of a colloidal gold immunochromatography rapid detection card and a preparation method thereof, the signal enhancer comprises a silver ion solution, a thiourea-ascorbic acid synergistic reducing agent, a pH buffer system and a surfactant stabilizing system, the signal amplification is realized by catalyzing and depositing silver nanoparticles on the surface of colloidal gold, the operation is simple and convenient, one-time addition is realized, and the reaction is completed within 5-10 minutes; the sensitivity is improved by 5-10 times, and the specificity is higher than 98%; the stability is excellent, and the storage time is 12 months at 4 DEG C; various colloidal gold rapid detection cards are universally compatible; compared with the prior art, the colloidal gold immunochromatography rapid detection card has the advantages that the cost is controllable, the single detection is increased by 0.3-0.5 yuan, and the colloidal gold immunochromatography rapid detection card is particularly suitable for ultra-sensitive detection of small molecular substances in the field of food safety, for example, the detection limit of malachite green reaches 0.1 microgram per liter, the detection limit of fipronil reaches 0.5 microgram per liter, and the application range of the colloidal gold immunochromatography rapid detection card is obviously expanded.

The invention discloses antibacterial ceramic glaze as well as a preparation method and application thereof, belongs to the technical field of ceramic glaze processing, and aims to solve the technical problem that the antibacterial property of ceramic glaze needs to be further improved in the prior art. The high-temperature-resistant glaze specifically comprises the following components in parts by weight: 40-60 parts of modified kaolin, 10-20 parts of modified calcite, 40-60 parts of feldspar powder, 5-10 parts of zinc oxide, 8-10 parts of borax, 20-30 parts of alumina and 20-30 parts of perlite. Silver ions and copper ions are used as antibacterial agents, complementation of the two antibacterial agents is achieved, the limitation of a single antibacterial agent is broken through when the two antibacterial agents are used in cooperation, common microorganisms such as bacteria, fungi and molds can be covered after cooperation, and the effects of rapid sterilization and long-acting bacteriostasis are achieved.

The invention provides a preparation method of silver-coated copper powder, and belongs to the technical field of conductive silver paste. The method comprises the following steps: S1, preparing a base solution containing copper powder: uniformly mixing the copper powder, a complexing agent and water to obtain the base solution; s2, a copper powder oxide layer is removed, specifically, the base solution is stirred, and the copper powder oxide layer is removed in the process of stirring the base solution; s3, silver-coated copper powder is prepared, specifically, a silver salt aqueous solution is added into the base solution, and stirring continues; after the reaction is finished, washing and drying to obtain silver-coated copper powder; the mass of silver ions in the silver salt aqueous solution is 1%-90% of the mass of the copper powder. According to the method, operation is simpler, coating is more uniform, the prepared silver-coated copper powder is lower in resistivity, the independent copper powder deoxidation step and the subsequent copper powder separation and washing step can be omitted, the copper powder deoxidation process is fused into the material mixing process, and the copper powder is prevented from being oxidized again in the separation and washing steps.