285 results about "Silver salts" patented technology

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 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 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 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 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.

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.

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 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 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 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 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.

The application relates to the technical field of organic synthesis, and discloses a preparation method of a hydrocarbyl carboxylic acid, which comprises the following steps: mixing a hydrocarbyl aldehyde, an oxidizing agent and a first metal salt to perform pre-reaction, and then mixing the reaction system obtained through the pre-reaction with a second metal salt to perform reaction; wherein the first metal salt is selected from at least one of a sodium salt, a potassium salt, a calcium salt, a lithium salt, an iron salt and a copper salt; and the second metal salt is selected from at least one of a zinc salt, a manganese salt, a cobalt salt, a palladium salt and a silver salt. The preparation method of the hydrocarbyl carboxylic acid can greatly shorten the reaction time, and improve the raw material conversion rate, the target product selectivity and the target product purity of the aldehyde oxidation acid reaction.

The invention provides a catalyst for heavy oil methane modification and a preparation method and application thereof, and belongs to the technical field of catalyst manufacturing. The preparation method of the catalyst for heavy oil methane modification comprises the following steps: S1, dissolving a zinc salt, a silver salt, a gallium salt, a nickel salt, citric acid and ethylene glycol in water, and mixing to obtain a mixed solution; wherein the molar ratio of the zinc element to the silver element to the gallium element to the nickel element is x: (1-x): y: (1-y), x is more than or equal to 0.01 and less than or equal to 0.99, and y is more than or equal to 0.01 and less than or equal to 0.99; and S2, carrying out dipping treatment on the carrier by adopting the mixed solution, and sequentially carrying out aging treatment, drying treatment and calcining treatment on the carrier subjected to dipping treatment to obtain the catalyst. The catalyst prepared by the method has a relatively good heavy oil methane modification effect, namely relatively good desulfurization and denitrification effects and relatively high liquid phase yield.

Concentrated dispersions of silver nanowires are used to produce qualitatively distinct silver structures with various properties. The concentrated dispersions may contain a high weight percent of silver nanowires and can be formulated to be a fluid liquid or a non-fluid paste. The concentrated dispersions may be stable for up to a week without visible sedimentation, may have non-Newtonian rheology, and can be diluted to a desired weight percent of silver nanowires without adversely affecting the uniformity of the dispersion. The concentrated dispersions may be formulated with or without polymer or prepolymer components. The concentrated dispersions may be formulated with silver salts to adjust the dispersion of silver nanowires and to improve the conductivity of the hardened silver structures formed from the dispersions. Methods for forming concentrated dispersions are described as methods for forming silver structures from dispersions.

This application discloses a negative curvature polycyclic aromatic hydrocarbon containing an eight-membered ring, its synthesis method, and its application, belonging to the field of organic synthesis. The synthesis method uses a haloacenaphthene derivative as a starting material. First, a tetrahalogenated key intermediate containing an eight-membered ring is constructed via a titanium tetrachloride-catalyzed cyclization tetramerization reaction. Subsequently, this intermediate undergoes a cyclization coupling reaction with an alkyne compound in the presence of a palladium catalyst, silver salt, and phosphine ligand to generate a negative curvature polycyclic aromatic hydrocarbon containing an eight-membered ring. The synthesis method of this application avoids multi-step precursor synthesis, resulting in a concise process. It allows for the flexible introduction of functional groups such as trifluoromethyl and silyl groups, improving the solubility and processability of the material. The obtained product exhibits a non-planar configuration, a narrow optical band gap, and excellent electron transport properties, making it suitable for applications... n Applications include semiconductors, chiral optoelectronic materials, and nano-carbon materials.

The application 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, spinning, and obtaining a polyacrylonitrile nanofiber membrane; then immersing the polyacrylonitrile nanofiber membrane in a tris-hydroxymethyl aminomethane hydrochloride solution containing dopamine; then immersing the dopamine-coated fiber membrane in a mixed solution containing a copper salt or a silver salt, and then immersing the dopamine-coated fiber membrane in a reaction solution, so as to obtain a modified nanofiber membrane; then spraying a dispersion liquid containing a conductive filler on the modified nanofiber membrane, so as to obtain a conductive filler modified nanofiber membrane; and finally dissolving polyurethane in a solvent, spinning the conductive filler modified nanofiber membrane as a receiver, and obtaining a composite nanofiber membrane. The composite nanofiber membrane has excellent electromagnetic shielding performance, directional sweat-removal capability, air permeability, light-heat conversion capability, antibacterial property, mechanical strength and flexibility.

The invention relates to the technical field of burn gels, in particular to an antibacterial burn gel and a preparation method thereof.The preparation method comprises the following steps that carbomer is dispersed in water, standing and swelling are conducted, and a primary gel matrix is obtained; stirring the primary gel matrix, sequentially adding emulsified silicone oil, ethanol, a disodium ethylene diamine tetraacetate solution and an emulsifier, and stirring to obtain a mixture A; adding silver salt and modified hydroxyapatite nanorods into the mixture A, and stirring to obtain a mixture B; the pH value of the mixture B is adjusted to 6.5-7.5, and the antibacterial burn gel is obtained. According to the invention, silver salt is introduced to endow the burn gel with excellent antibacterial performance; the hydroxyapatite nanorods are introduced, so that the problem that the antibacterial property is reduced due to silver ion precipitation is solved, the biocompatibility and the heat dissipation effect of the gel are synchronously enhanced, and a more efficient and safer solution is provided for antibacterial and repair of burn wounds.

This invention provides a silver-based SCR catalyst, its preparation method, and its application, belonging to the field of air pollution control technology. The preparation method of the silver-based SCR catalyst provided by this invention includes the following steps: impregnating alumina hydroxyaluminate in a soluble silver salt aqueous solution to obtain a catalyst precursor; subjecting a portion of the catalyst precursor to a first calcination at 450–550°C to obtain a first calcined product; subjecting the remaining catalyst precursor to a second calcination at 850–950°C to obtain a second calcined product; and mixing the first and second calcined products to obtain the silver-based SCR catalyst. The preparation method provided by this invention is green and low-cost. When the obtained silver-based SCR catalyst is used for flue gas denitrification, it can maintain a high NO conversion rate from low to high temperatures.

The present invention relates to the field of electroplating, and discloses a tin-silver alloy electroplating solution, a preparation method and application thereof, and an electroplating method. The electroplating solution contains a soluble stannous salt, a soluble silver salt, a composite surfactant, a free acid, an antioxidant, a complexing agent and a solvent. When electroplating with the electroplating solution, the available current density can reach 25 ASD, the electroplating efficiency is high, and the tin-silver alloy bumps obtained by electroplating are uniform, the proportion of voids after bump reflow is small, and no collapse occurs.

The invention provides metal-doped silver powder, a preparation method of the metal-doped silver powder and photovoltaic cell silver paste, and belongs to the technical field of photovoltaic silver paste. The silver powder comprises 10-50 parts by mass of silver salt; 1-3 parts by mass of a metal salt; 3-15 parts by mass of a reducing agent; 2-5 parts by mass of a modifier; 5-25 parts by mass of a dispersant; and 2000 parts by mass of a solvent. According to the invention, the metal salt is doped in the silver powder, so that the contact resistance of the silver grid line can be effectively reduced, and the photoelectric conversion efficiency of the battery piece is improved.

The application belongs to the technical field of chemical synthesis, and particularly relates to a synthesis method of 2-aryl-2-cyclohexanedione enol ester compounds. The method uses a transition metal complex as a catalyst, and uses a phenyl boronic acid compound and an iodine onium compound as raw materials, first synthesizes a 3-hydroxy-2-aryl-2-cyclohexenone compound, and then synthesizes the 2-aryl-2-cyclohexanedione enol ester compound through acylation. The reaction condition is mild, no additional additives (such as alkali-sodium acetate, expensive silver salt-silver acetate, etc.) need to be added, the C-C bond can be efficiently and quickly constructed, the 2-aryl-2-cyclohexanedione cyclization derivative is obtained, the reaction operation is simple, the reaction time is short, the method has high efficiency and high safety, the substrate range is wide, the functional group tolerance is good, the method conforms to the concept of green chemistry and high atomic economy, and is very suitable for large-scale industrial production.

The application relates to the technical field of organic synthesis, in particular to a catalyst, a preparation method thereof and a preparation method of methyl glycolate. The preparation method of the catalyst comprises the following steps: loading a copper salt and a silver salt on a carrier to obtain a catalyst precursor, wherein the material of the carrier comprises silicon dioxide; performing electromagnetic radiation treatment on the catalyst precursor to obtain a modified catalyst precursor; and performing reduction treatment on the modified catalyst precursor, so that the copper salt loaded on the carrier is reduced into elemental copper, and the silver salt loaded on the carrier is reduced into elemental silver. The preparation method can improve the DMO conversion rate and the MG selectivity.