363 results about "Silver salts" patented technology

The invention discloses silver powder with high tap density and a preparation method and application thereof, and the preparation method of the silver powder comprises the following steps: dispersing silver salt in an alcohol amine solution, and then reacting with an organic amine solution to prepare silver particles. According to the preparation method of the silver particles, spherical powder with different particle sizes can be prepared, silver paste prepared from the spherical silver powder generally has better fluidity, the silver particles with large particle sizes and the silver particles with small particle sizes are filled with one another, the sufficient contact area between the silver powder is ensured, and the requirement of the front silver paste for the performance of the silver powder can be met.

The invention discloses a silver azide in-situ charging method based on ink-jet printing, and belongs to the technical field of energetic material charging. According to the ink-jet printing method, sodium azide printing ink and a silver salt solution are prepared respectively, the surface tension and viscosity of the sodium azide printing ink are adjusted through a binder and a surfactant, the surface tension and viscosity of the silver salt printing ink are adjusted through the mass ratio of ethylene glycol to water, sodium azide and silver salt are printed in sequence, and silver azide is obtained through an in-situ reaction. According to the method, the initiating explosive can be printed on the medium in situ, complete hand-free operation is achieved in the charging process, and danger in the manual silver azide charging process is avoided.

The invention provides application of a silver-bismuth tungstate catalyst in preparation of methanol from light-driven CO2, and belongs to the technical field of CO2 conversion and reduction. Bismuth tungstate nanosheets, silver salt and water are mixed, the size of silver particles is controlled by adjusting the pH value, the silver-bismuth tungstate catalyst is obtained, and the size of the silver particles is 20-50 nm; silver is evenly distributed on the surface of bismuth tungstate, the obtained silver-bismuth tungstate catalyst is large in specific surface area and high in light response capacity, the silver-bismuth tungstate catalyst can generate a large number of high-energy hot electrons during illumination, in-situ photo-thermal conversion is achieved, no external heat source is needed for heat supply, the photo-thermal effect is enhanced, CO2 conversion is promoted, and the methanol yield is increased.

The invention provides electroplating liquid, an electroplating method, an alloy bump and a preparation method of the alloy bump. The electroplating solution comprises the following components with mass concentration: 5-20 g / L of water-soluble cyanogen-containing gold salt, 1-15 g / L of water-soluble silver-containing salt, 0.5-5 g / L of cobalt citrate, 1-10 g / L of a refiner, 20-100 g / L of conductive salt, 10-90 g / L of a compound complexing agent and the balance of deionized water. The refining agent is selected from one or more of sodium lignin sulfonate, 5-nitroguaiacol sodium salt, sodium carboxymethyl cellulose and sodium alginate. Cobalt citrate and a specific substance are selected as refiners, so that the prepared gold-silver alloy bump is high in hardness and low in surface roughness; and through matching of the complexing agent, the antioxidant and the stabilizer, the oxidation resistance and the stability of the electroplating liquid are greatly improved, and the service life is prolonged.

The present invention relates to a method for quickly identifying white vaseline from different manufacturers based on silver salt-assisted laser desorption ionization-time of flight mass spectrometry, and belongs to the field of detection. Specifically comprising the following steps: S1, exploring and optimizing metal salt ion conditions, matrix conditions, and sampling methods, and using the optimized experimental conditions for sample preparation; S2, measuring the sample; S3, using eMSTAT Solution software for data analysis to achieve identification of white vaseline from different manufacturers. The method of the present invention replaces traditional organic matrices with silver salts, eliminates background interference, and improves the mass spectrometry signal-to-noise ratio; combines a direct smearing method to avoid complex solvent preparation and extraction, and is easy to operate; applies a mass spectrometer for mass spectrometry acquisition, has accurate molecular weight, reduces the detection time of each sample to 6 seconds, has high analytical throughput, and is low in cost, thereby achieving high-throughput, accurate, and rapid identification of large quantities of white vaseline from different sources.

The invention belongs to the technical field of ammonia synthesis and electro-catalysis, and particularly relates to a preparation method and application of high-entropy alloy aerogel for electro-catalysis. The preparation method comprises the following steps: mixing an inorganic metal salt in a solvent to obtain a precursor solution, quickly adding a reducing agent, standing, and washing and drying the obtained product to obtain the high-entropy alloy aerogel catalyst, the inorganic salt is selected from five or more of copper salt, cobalt salt, iron salt, nickel salt, palladium salt, gold salt, ruthenium salt, platinum salt and silver salt. The three-dimensional continuous porous reticular high-entropy alloy aerogel is obtained through one-step reduction of the inorganic metal salt and standing assembly, the high-entropy alloy aerogel prepared through the method is high in reduction assembly speed, phase separation of multi-component alloy can be effectively inhibited, an amorphous alloy structure is obtained, and therefore when the high-entropy alloy aerogel is applied to ammonia production through electro-catalysis nitrate reduction, the high-entropy alloy aerogel can be used for preparing the high-entropy alloy aerogel. And excellent electrochemical activity and stability can be presented in an ultra-low overpotential range of-0.2 to + 0.2 V vs.RHE.

The invention provides a graphene-based hydrogen sulfide gas sensor and a preparation method thereof, and relates to the technical field of gas sensors. The preparation method of the graphene-based hydrogen sulfide gas sensor comprises the following steps: soaking the wood substrate in a mixed metal salt solution containing a water-soluble silver salt and a water-soluble transition metal salt; irradiating the soaked wood substrate by using a laser beam at room temperature under the condition of no shielding gas, so that lignin and cellulose in the wood substrate are cracked and reconstructed to form graphene; meanwhile, the mixed metal salt immersed in the wood substrate is decomposed to form bimetallic oxide nanoparticles including silver oxide nanoparticles and transition metal oxide nanoparticles, and the bimetallic oxide nanoparticles are dispersed on the surface of each layer of graphene to obtain a sensitive layer; and coating conductive materials on the wooden substrate and on the two sides of the sensitive layer to form a connecting electrode in contact with the sensitive layer, thereby obtaining the graphene-based hydrogen sulfide gas sensor.

The invention relates to the field of electroplating, and discloses a tin-silver alloy electroplating solution as well as a preparation method and application thereof and an electroplating method, and the electroplating solution comprises soluble stannous salt, soluble silver salt, a composite surfactant, free acid, an antioxidant, a complexing agent and a solvent. When the electroplating liquid is used for electroplating, the available current density can reach 25 ASD, the electroplating efficiency is high, tin-silver alloy salient points obtained through electroplating are uniform, the cavity proportion is small after the salient points flow back, and collapse is avoided.

The invention discloses silver paste and a preparation method thereof. The silver paste comprises silver powder and an organic carrier. Wherein the organic carrier comprises a solvent, a metal complexing agent and silver salt; wherein the metal complexing agent and silver salt are subjected to a complexing reaction to generate a complex, and the complex has a polar group. In this way, diffusion of silver paste in the printing process can be reduced, and the precision and reliability of the semiconductor device are improved.

The invention discloses a catalyst for synthesis of methane by electrocatalytic reduction of carbon dioxide and a preparation method and application thereof, and the preparation method comprises the following steps: adding soluble copper salt, hexadecylamine and glucose into water, and carrying out ultrasonic dispersion to obtain a mixed solution; performing a first hydrothermal reaction on the mixed solution at 110-130 DEG C, mixing the mixed solution with a mixed solution of silver salt and imidazole, and then performing a second hydrothermal reaction at 45-55 DEG C for 20-30 minutes; and after the reaction is completed, carrying out solid-liquid separation, and washing and drying the solid. The bimetallic catalyst is jointly formed by copper and silver, the activity of the catalyst can be improved through the synergistic effect between catalytic components, more catalytic active sites are provided through the special morphology of the bimetallic catalyst, and the problems that in the existing electrocatalytic reduction process, the catalyst is poor in stability, low in yield, serious in side reaction and the like are solved; and the method has the advantages of simple synthesis process, strong electrocatalytic activity, good stability and the like.

The invention relates to a composite nanofiber membrane and a preparation method and application thereof, and belongs to the technical field of wearable electromagnetic shielding materials. The preparation method comprises the following steps: dissolving polyacrylonitrile in a solvent, and spinning to obtain a polyacrylonitrile nanofiber membrane; then, the polyacrylonitrile nanofiber membrane is soaked in a trihydroxymethyl aminomethane hydrochloride solution containing dopamine; soaking the dopamine-coated fiber membrane in a mixed solution containing a copper salt or a silver salt, and then soaking the dopamine-coated fiber membrane in a reaction solution to obtain a modified nanofiber membrane; then spraying a dispersion liquid containing a conductive filler onto the modified nanofiber membrane to obtain a conductive filler modified nanofiber membrane; and finally, dissolving polyurethane into a solvent, and spinning by taking the conductive filler modified nanofiber membrane as a receiver to obtain the composite nanofiber membrane. The composite nanofiber membrane has excellent electromagnetic shielding performance, directional perspiration ability, air permeability, photothermal conversion ability, antibacterial property, mechanical strength and flexibility.

The invention belongs to the technical field of extraction separation, and relates to a silver-based eutectic solvent which is composed of silver salt serving as a hydrogen bond acceptor and an organic compound serving as a hydrogen bond donor. Wherein the organic compound serving as the hydrogen bond donor is a carbonyl organic compound or an alcohol organic compound. The silver-based deep-eutectic solvent provided by the invention is easy to prepare, the structure is easy to regulate and control, and the silver-based deep-eutectic solvent has the advantages of good thermal stability, reproducibility and the like, and has high unsaturated hydrocarbon absorption capacity and excellent separation performance for unsaturated hydrocarbon mixtures.

The invention relates to the technical field of biomedical materials, in particular to collagen sponge and a preparation method thereof.The preparation method comprises the following steps that under the condition of 4-8 DEG C, silver-containing turbid liquid is added into a collagen solution, ultrasonic treatment is conducted, magnetic stirring is matched at the same time, and a mixed solution is obtained; performing high-pressure homogenizing and refining treatment on the mixed solution to obtain a homogenized solution; freezing the homogenized liquid at-80 DEG C, and then unfreezing at 4-37 DEG C to obtain pretreated homogenized liquid; and carrying out freeze drying on the pretreated homogeneous liquid to obtain the collagen sponge. According to the preparation method disclosed by the invention, a low-temperature ultrasonic-magnetic composite dispersion method is combined with homogenizing treatment, so that silver salt is uniformly dispersed in a collagen solution on the premise of avoiding thermal denaturation of collagen; and then a freezing-unfreezing pretreatment process is combined, so that the hydrogen-bond interaction between the silver salt uniformly dispersed in the collagen solution and the collagen is enhanced, the binding force between the silver salt and the collagen is improved, and sudden release of the silver salt is avoided.

To provide means for producing silver nanoparticles having a narrow particle size distribution and a fine particle size in a high yield.SOLUTION: A method for producing silver nanoparticles comprises: a raw material preparation step for preparing an aqueous solution of a silver salt and an aqueous solution of a reducing agent including an alkali metal hydroxide or an alkaline earth metal hydroxide; a temperature-raising step for mixing the aqueous solution of the silver salt and the aqueous solution of the reducing agent and raising the temperature of the mixture to a reaction temperature of 100°C or higher within 30 seconds from the start of mixing; and a reaction step for maintaining the mixture obtained in the temperature-raising step at the reaction temperature.SELECTED DRAWING: Figure 1

The invention provides nano silver powder as well as a preparation method and application thereof. The preparation method of the nano silver powder comprises the steps that a reducing agent, a pH regulator, a first dispersing agent and a first part of water are subjected to first mixing, a reducing solution is obtained, and the temperature of the reducing solution is controlled to be 0-20 DEG C; silver nitrate, a second dispersing agent and a second part of water are subjected to second mixing, an oxidizing solution is obtained, the temperature is adjusted to-5 DEG C to-20 DEG C, and an oxidizing solid is obtained; and thirdly, under the conditions that the temperature is 0-20 DEG C and the speed is 10-200 rpm, the oxidizing solid and the reducing solution are subjected to third mixing, and the nanometer silver powder is obtained. By changing the state of the materials, solidifying the oxidation system containing the silver salt into the ice crystals and mixing the ice crystals with the reduction system at low temperature, the characteristic that the materials are converted from the solid state to the liquid state is utilized, the production cost of the nano-silver powder is remarkably reduced, the yield and purity of the nano-silver powder are improved, operation is easy, control is convenient, and the method is suitable for industrial production. The method is suitable for industrial large-scale production.

Provided is a method of efficiently producing semiconductor nanoparticles that exhibit band-edge emission with a high band-edge emission purity. The method comprises performing a first heat treatment of a first mixture comprising a silver (Ag) salt, an indium (In) salt, a compound having a gallium-sulfur (Ga—S) bond, a first gallium halide, and an organic solvent, to obtain first semiconductor nanoparticles.

The invention discloses a preparation method of high-tap-density high-dispersity superfine silver powder, and belongs to the technical field of conductive silver paste, and the preparation method comprises the following steps: mixing a refiner, a reducing agent, alkali liquor and a silver salt oxidation solution, and performing oxidation-reduction reaction under mechanical stirring and ultrasonic stirring to obtain silver powder liquid; the method comprises the following steps: washing a silver powder material with water until the conductivity is less than or equal to 50us / cm, then hydraulically drying the silver powder material in a vacuum state under mechanical stirring and ultrasonic stirring, washing with alcohol, and then hydraulically drying the silver powder material in the vacuum state under mechanical stirring and ultrasonic stirring to obtain superfine silver powder; under mechanical stirring and ultrasonic stirring, hot alcohol is adopted for dissolving a dispersing agent to obtain a dispersing agent solution, then the dispersing agent solution is adopted for dispersing the superfine silver powder, vacuum drying is conducted, and the high-tap-density and high-dispersity superfine silver powder is obtained. The superfine silver powder is high in tap density and small in particle size, meets the electrical property requirement of silver paste on the back face of a metal electrode on a crystalline silicon solar cell, and is high in yield.

A method for preparing a silver powder, comprising: subjecting a first silver salt, a first dispersing agent and a first reducing agent to a first treatment, so as to obtain silver crystal nucleuses; and subjecting the silver crystal nucleus, a second silver salt, a second dispersing agent, a second reducing agent and a modifying agent to a second treatment, so as to obtain a silver powder, wherein the modifying agent comprises lauric acid, decanoic acid and undecanoic acid. The silver powder prepared by means of the method has good dispersity and wettability, a narrow particle size distribution, a small particle size and high sintering activity, and is not prone to agglomeration in a conductive silver paste, thereby enabling the conductive silver paste to have a high solid content and endowing the conductive silver paste with good conductivity. The present invention further relates to a silver powder, a conductive silver paste, an electronic device and electric equipment.

The invention relates to the field of electroplating, and discloses a tin-silver alloy electroplating solution and a preparation method and application thereof.The electroplating solution comprises soluble stannous salt, soluble silver salt, a composite defoaming agent, an anti-scorching agent, free acid, an antioxidant, a complexing agent and a solvent, and the composite defoaming agent comprises a first defoaming agent and a second defoaming agent; the first defoaming agent is selected from naphthol sulfonic acid, and the second defoaming agent is selected from naphthol ether; the molar ratio of the first defoaming agent to the second defoaming agent is 1: (1-4). The tin-silver alloy electroplating solution provided by the invention contains the composite defoaming agent compounded by the naphthol sulfonic acid and the naphthol ether, so that foam can be effectively prevented from being formed, and meanwhile, the formed foam is destroyed, so that a tin-silver alloy bump is prevented from generating a cavity after backflow. In addition, the composite defoaming agent has good water solubility and high cloud point, does not cause turbidity of the electroplating liquid at a relatively high temperature, and can avoid influence on normal use of the electroplating liquid.

The preparation method comprises the following steps that pretreated copper powder, a dispersing agent and water are mixed to obtain a copper powder mixed solution, first silver salt, a first complexing agent and water are mixed to obtain a first silver complexing solution, the first silver complexing solution is dropwise added into the copper powder mixed solution, a replacement reaction is conducted, and the silver-coated copper powder with the compact coating is obtained. Intermediate-state silver-coated copper powder is obtained; second silver salt, ammonia water and a second complexing agent are mixed, a second silver complexing solution is obtained, the second silver complexing solution and the reducing agent solution are dropwise added into the intermediate-state silver-coated copper powder at the same time, an oxidation-reduction reaction is carried out, then solid-liquid separation and washing are carried out, and silver-coated copper powder is obtained; through raw material control and step-by-step reaction of first replacement and second reduction, under the condition of low silver content, the uniformity and compactness of a silver layer are improved, the conductivity / oxidation resistance of the silver-coated copper powder is guaranteed, and finally the photoelectric conversion efficiency of the photovoltaic silver paste is improved.

The invention discloses an ultra-high molecular weight polyvinylidene fluoride-based polymer and a preparation method thereof, and belongs to the technical field of fluorine chemical industry. An emulsifier (a series of anionic fluorinated surfactants such as perfluoroalkyl carboxylic acid and salt thereof, perfluoroalkyl sulfonic acid and salt thereof, perfluoroalkyl polyether fluorocarbonic acid and salt thereof) used for fluorine-containing olefin emulsion polymerization is used as a protecting group for generating metal nanoparticles through in-situ reduction; in the emulsion polymerization reaction process, a silver salt precursor is subjected to in-situ reduction to synthesize silver nanoparticles, and then the silver nanoparticles interact with an initiator to initiate fluorine-containing olefin monomer polymerization. Through in-situ reduction, the problem that the efficiency of catalytic initiation polymerization reaction is reduced due to the fact that monodisperse metal nanoparticles are prone to aggregation for a long time is solved.

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.

The invention discloses a molecular sieve for adsorbing and separating ethylene and ethane as well as a preparation method and a use method thereof, and belongs to the field of gas adsorption and separation, the molecular sieve is a molecular sieve with LTA configuration, the preparation method comprises the following steps: drying and calcining an ion exchange product of silver salt and LTA molecular sieve, and component cations of the molecular sieve at least comprise Na < + > ions and Ag < + > ions; according to the method, the content of Ag is effectively controlled, the problem that the selectivity of an existing adsorbent for separating C2H4 / C2H6 is not ideal is solved, and a feasible technical route is provided for effective recycling of high-added-value products.

The invention relates to the technical field of biomedical materials, in particular to silver-containing collagen sponge and a preparation method thereof.The preparation method comprises the following steps that S1, silver salt is added into a collagen solution, and a first solution is obtained; s2, glutathione and ethylene diamine tetraacetic acid disodium salt are added into the first solution, and a second solution is obtained; s3, adding sodium alginate and chitosan into the second solution, and homogenizing to obtain a homogenized solution; and S4, carrying out freeze drying on the homogenized liquid to obtain the silver-containing collagen sponge. The preparation method of the silver-containing collagen sponge provided by the invention is simple in process, good in reproducibility and suitable for large-scale production; according to the silver-containing collagen sponge, chelating is stably combined with a microcapsule coating composite system, oxygen is isolated from silver ions, the oxidation rate of the silver ions is remarkably reduced, meanwhile, slow release of silver is achieved, and therefore the antibacterial time efficiency of the silver-containing collagen sponge can be prolonged.

The invention provides a preparation method of nano silver salt particles, which specifically comprises the following steps: step 1, mixing quantum dots and silver salt, dispersing into a solvent, and stirring in a dark place until no solid exists to obtain a mixed solution; step 2, transferring the mixed solution obtained in the step 1 into a visual window high-pressure reaction kettle, filling carbon dioxide until the pressure intensity in the visual window high-pressure reaction kettle is 12-20 MPa, providing certain illumination, stirring and reacting for a period of time under the condition that the temperature is 40-80 DEG C, and releasing the carbon dioxide to normal pressure to obtain a mixed solution; and thirdly, the mixed solution obtained in the second step is centrifuged, washed and dried, and finally the nano-silver particles are obtained.

The invention relates to the field of metal powder preparation, and particularly discloses a surface pattern spherical silver powder preparation method which comprises the following preparation steps: S1, preparing a reaction base solution: dissolving silver salt in water to obtain a silver salt solution, and then regulating the pH value and temperature of the silver salt solution by using a pH regulator to obtain the reaction base solution; s2, preparing a dispersion liquid: dissolving a dispersing agent in water, and adjusting the temperature to obtain the dispersion liquid; s3, preparing alkali liquor: dissolving an alkaline solvent in water to obtain the alkali liquor; s4, preparing a reducing solution: dissolving a reducing agent in water, and adjusting the temperature to obtain the reducing solution; s5, preparing a modified liquid: dissolving a modifier in absolute ethyl alcohol to obtain the modified liquid; s6, carrying out a reaction; s7, cleaning is conducted; the alkali liquor further comprises a glucose capsule. The silver powder prepared through the method is regular in morphology and uniform in particle size and is in a pattern sphere shape.

Provided is a bonding material which is capable of forming a silver bonding layer that has good bondability with a material to be bonded, wherein the density (denseness) of the silver is good. The bonding material comprises an organic acid silver salt, an organic solvent, and silver particles. The organic acid silver salt has a weight loss rate (Mr1) of 5% or less when the temperature thereof is raised from 25°C to 200°C and a weight loss rate (Mr2) of 40% or more when the temperature thereof is raised from 200°C to 280°C as determined by simultaneous thermogravimetry-differential thermal analysis (TG-DTA) (in a nitrogen atmosphere at a nitrogen flow rate of 200 ml / min and a heating rate of 10° C / min). The organic solvent contains a compound represented by general formula (1) (in the formula, R1 represents a linear or branched alkyl group having 2 to 6 carbon atoms).　The silver particles include: first silver particles that have an average particle diameter (D50 diameter) of 0.15 μm or more and 0.4 μm or less; and at least one of second silver particles that have an average particle diameter (D50 diameter) of 0.6 μm or more and 1.0 μm or less and third silver particles that have an average particle diameter (D50 diameter) of 1.9 μm or more and 2.4 μm or less.

The invention discloses an in-situ preparation method of a nano-silver-antibacterial peptide conjugate agar antibacterial film. The in-situ preparation method comprises the following steps: dissolving pectin in an alkali solution to obtain a pectin alkali solution; adding nisin and silver salt into the pectin alkali solution, and mixing to obtain a colloidal solution; agar and an emulsifier are added into the colloidal solution, and the nano-silver-antibacterial peptide conjugate agar antibacterial film is obtained after mixing. Biomacromolecule pectin is used as a reducing agent and a stabilizing agent, pectin molecules contain a large number of carboxyl groups, the carboxyl groups can be ionized under the alkaline condition to form carboxyl anions, the reducing capacity of the pectin molecules is improved, silver ions can be reduced into silver atoms, and therefore synthesis of nano-silver is promoted; in addition, the alkaline condition can improve the reaction rate, improve the dispersity of the nano-silver and improve the stability of the nano-silver. The colloidal solution contains a nano silver-antibacterial peptide conjugate.

The invention relates to the technical field of catalytic materials, in particular to a monatomic alloy catalyst and a preparation method and application thereof.The preparation method comprises the steps that a first solution obtained by mixing cobalt salt, silver salt and a solvent is mixed with a second solution obtained by mixing 2-methylimidazole and a solvent, stirring treatment is conducted, and a first precursor solution is obtained; and carrying out first heat treatment on the obtained precipitate in an inert atmosphere to obtain the fcc Ag1Co / C monatomic alloy catalyst. A first solution and a second solution are mixed to obtain an Ag / ZIF-67 precipitate which is a Co-based zeolite imidazate framework structure composite material, an organic framework of the Co-based zeolite imidazate framework structure composite material is decomposed and carbonized through high-temperature heat treatment, meanwhile, Ag and Co species are reduced and converted into nanoparticles, and the Ag / ZIF-67 precipitate is obtained. And finally, the composite material catalyst with the Ag1Co monatomic alloy nanoparticles embedded into the nitrogen-doped carbon matrix is formed. The catalyst shows the most excellent activity and selectivity, the removal rate of 4-NP reaches 100% within 6 min, and high catalytic activity can be achieved.