182 results about "Silver acetate" patented technology

The invention relates to a method for preparing a length-diameter-ratio nano-silver wire by a pH-value regulation solvothermal method. The method comprises the following steps of: preparing the following ethylene glycol solution, namely an ethylene glycol solution A of silver nitrate or silver acetate, an ethylene glycol solution B of polyvinyl pyrrolidone (PVP), an ethylene glycol solution C of water-soluble chloride and concentrated acid D; mixing the components according to a certain amount and fully stirring to form a final mixed solution; moving the final mixed solution into a reaction kettle; placing in an oven for reaction for a certain time; taking the reaction kettle out and cooling to room temperature to obtain mother liquid of the nano-silver wire; adding alcohol into the mother liquid for diluting, and removing supernatant liquor to obtain a precipitate; and repeatedly performing centrifugal separation, and thus obtaining nano-silver wire dispersion liquid uniformly dispersed in the alcohol. The method is simple, high in efficiency and low in cost, and can prepare high-quality nano-silver wires within a wider range of reaction condition; and prepared products are high in length-diameter ratio, good in length uniformity and low in impurity content.

A conductive composition capable of producing a conductive paint with excellent flexibility and a high conductivity comparable to that of metallic silver, without using high temperatures as film forming conditions. The conductive composition includes a particulate silver compound and a binder, and optionally a reducing agent and a binder. Silver oxide, silver carbonate and silver acetate and the like are used as the particulate silver compound. Ethylene glycol, diethylene glycol, and ethylene glycol diacetate and the like are used as the reducing agent, and a fine powder of a thermosetting resin such as a polyvalent phenol compound, phenol resin, alkyd resin or polyester resin, or a thermoplastic resin such as a styrene resin or polyethylene terephthalate, with an average particle diameter from 20 nm to 5 μm is used as the binder. Furthermore, the average particle diameter of the particulate silver compound is preferably from 0.01 to 10 μm.

The invention relates to a silver-loaded antibacterial dressing and a preparation method thereof. The preparation method comprises the steps of dissolving silver salt components such as silver nitrate and silver acetate and stabilizing agent components such as poly-amido compounds, poly-hydroxyl compounds and poly-carboxyl compounds into deionized water, and then mixing the constituents uniformly, so that a silver salt antibacterial solution is obtained; dipping or soaking an antibacterial dressing substrate into the silver salt antibacterial solution, and conducting drying, so that silver loading of the antibacterial dressing substrate is achieved. The silver loading method of the silver ion antibacterial dressing is simple, easy to implement and suitable for large-scale production; the obtained silver-loaded antibacterial dressing has the excellent antibacterial property, silver ions can be released stably, oxidizing discoloration does not occur easily, falling of silver at a wound and pigment deposition are not caused easily, and the silver-loaded antibacterial dressing and the preparation method thereof can be widely applied to silver loading processing of various silver ion antibacterial dressings.

The invention discloses a treatment method for antibacterial and anti-ultraviolet cotton fabrics. The treatment method comprises the following steps: step 1, soaking the cotton fabrics with a nonionic surfactant; step 2, modifying the cotton fabrics with chitosan quaternary ammonium salt; step 3, dipping the cotton fabrics with antibacterial finishing liquid prepared by mixing 5-15 parts of a natural antibacterial agent composed of extracts of grape seeds, persimmon leaves, ginkgo leaves and licorice roots, 0.3-1 part of polyoxyethylene-40 hydrogenated castor oil and 1000 parts of water; step 4, soaking the cotton fabrics in a mixed aqueous solution containing 0.001-0.005mol / L of silver nitrate or silver sulfate or silver acetate and 1-3 g / L of soluble starch or hydroxyethyl cellulose to prepare the nano-silver attached antibacterial cotton fabrics. The prepared cotton fabrics not only have good antibacterial performance and anti-ultraviolet performance, but also have performance of resisting oxidation and scavenging free radicals, and have improved anti-wrinkle performance and good washing durability.

The invention provides a graphene oxide / silver phosphate composite visible light catalyst and a preparation method of the graphene oxide / silver phosphate composite visible light catalyst, belonging to the technical field of nano-composite material and photocatalysis. The preparation method comprises the following steps of: dissolving graphene oxide in water, and ultrasonically treating to obtain graphene oxide dispersing liquid; adding silver acetate into the graphene oxide dispersing liquid, and evenly stirring, to obtain mixed solution; slowly dropping prepared disodium hydrogen phosphate or sodium dihydrogen phosphate solution into the mixed solution of the graphene oxide and the silver acetate to continuously stir for a while; and repeatedly washing products obtained by reaction with deionized water and absolute ethyl alcohol, and carrying out vacuum drying to obtain the graphene oxide / silver phosphate nano-composite visible light catalyst. The invention has the advantages that the invention is wide in raw material source, and simple in preparation process, the obtained composite material is better in structure and feature, and the prepared nano-composite light catalyst is high-efficiency in degradation effect to the organic dyestuff rhodamine B and the methylene blue under the irradiation of visible light due to the structural advantage.

The invention discloses a preparation method for flaky nanometer silver powder. The flaky nanometer silver powder is prepared by performing reaction on a surfactant-containing aqueous solution of silver salt and a solution of ferrous salt at temperature of 0 to 100 DEG C, wherein the silver salt is silver nitrate, silver sulfate or silver acetate; a surfactant is polyvinylpyrrolidone, hexadecyl trimethyl ammonium bromide, sodium dodecyl sulfate or polyethylene glycol; the ferrous salt is ammonium ferrous sulfate or ferrous sulfate; the weight ratio of the silver salt to the ferrous salt is 2:1 to 1:4; and the weight ratio of the silver salt to the surfactant is 50:1 to 1:2. The flaky nanometer silver powder finally obtained by the method has an undiversified shape and high purity. The method also has the advantages of short reaction time, high efficiency, mild reaction conditions, simple process and equipment, low production cost, convenience for operation, no pollution and the like, and is particularly suitable for industrial production.

The invention discloses a method for removing thiophene sulfur in fuel oil by using Ag2O / SiO2 composite aerogel as an adsorbent, and belongs to the technical field of fuel oil processing. The method comprises the following steps: by taking tetramethyl orthosilicate, tetraethoxysilane, silica sol, sodium silicate and the like as silicon sources, and silver acetate, silver nitrate and the like as silver sources, preparing the Ag2O / SiO2 composite aerogel by adopting a sol gel-normal-pressure preparing drying method; quantitatively filling the aerogel into a fixed bed adsorption device, injecting model gasoline containing thiophene sulfur at certain temperature and air speed, collecting adsorbed model gasoline at the outlet in the lower end of a reaction device, and performing chromatographic analysis. The result shows that the Ag2O / SiO2 composite aerogel has a good adsorption property on thiophene sulfur. The Ag2O / SiO2 composite aerogel is simple in preparation method, low in cost, high in economic benefit, good in environment-friendliness, gentle in adsorption conditions and low in requirement on adsorption equipment, and can be repeatedly used.

The invention relates to a large-scale preparation method of silver nano-sheets; the method comprises the steps: (1) dispersing the seed crystals of the silver nano-sheets in water to form a suspension liquid with solid content of 0.01-1.6g / L, adding citric acid or sodium citrate solution with concentration of 0.06-170g / L to the suspension liquid, stirring and mixing uniformly, adding hydrazine hydrate or ascorbic acid, slowing adding silver nitrate or silver acetate with concentration of 0.2-250g / L, performing constant-temperature stirring reaction for 30 min to 4h to generate the silver nano-sheets; and (2) obtaining the finished silver nano-sheets after filtering and washing the silver nano-sheets generated in the step (1). Not only the silver nano-sheets prepared by the method are high in yield, high in purity, uniform in appearance, good in dispersibility and good in stability, but the needed equipment is simple in structure, convenient in operation and low in cost and has no emission of waste gas; the produced waste liquid is easy to be processed and the silver nano-sheets are applicable to large-scale preparation.

The invention provides a nano-grade-silver-filled room-temperature-cured conductive adhesive. A preparation method of the conductive adhesive comprises steps that: (a) silver nitrate or silver acetate powder is mixed with a polyvinyl pyrrolidone (PVP) dispersing agent; the mixture is added to an ethylene glycol solution, such that a solution reaction system containing silver ions is prepared; (b) sodium chloride is added to the solution reaction system containing silver ions; the mixture is well mixed by stirring, such that a reaction precursor is prepared; (c) the obtained reaction precursor is irradiated by using microwaves, such that a mixed solution containing silver nanowires is obtained; water or ethanol is added to the mixed solution, and the mixture is subject to high-speed centrifugation drying, such that silver nanowire powder is obtained; (d) the silver nanowire powder is added to epoxy resin, and the mixture is well mixed by stirring; a curing agent is added to the obtained mixed colloid, and the mixture is mixed, such that a finished product is obtained. The conductive adhesive provided by the invention has better properties than a conductive adhesive filled with pure sheet-shaped silver powder. The conductive adhesive provided by the invention is advantaged in high conductivity, high shear strength, high impact strength, and the like. The conductive adhesive provided by the invention can be widely applied in the field of electronic packaging requiring low-temperature conductive connections.

The invention discloses a method for preparing a silver sulfide quantum dot using MOFs as a carrier. The method uses the MOFs as the carrier and a template, silver nitrate or silver acetate as a silver source, sodium sulfide as a sulfur source, and a hydrazone-containing hydrophilic reagent as a surface ligand molecule, and achieves one-step preparation of the silver sulfide quantum dot with the MOFs as the carrier in an aqueous phase system. The prepared silver sulfide quantum dot with the MOFs as the carrier has an emission wavelength between 900 and 1250 nm, has good near-infrared fluorescence and chemical stability, and can be applied to the fields of bioluminescent labeling, imaging and photoelectric devices.

The invention discloses an inkjet nano-silver conductive ink and a preparation method of the ink. The inkjet nano-silver conductive ink comprises the following components by mass percent (the sum of mass percent of all components is 100%): 5-45% of silver nanoparticle, on the surface of which organic protecting agent with the particle diameter being smaller than 10nm is coated, and 55-95% of ink solvent. The preparation method comprises two steps, including preparation of the silver nanoparticle, on the surface of which organic protecting agent is coated, by taking silver acetate as raw material, and the preparation of nano-silver conductive ink. The method takes a small amount of alkyl hydrosulfide with strong effect on nano-silver and a large amount of alkylamine with weak effect on nano-silver as protecting agent to prepare the silver nanoparticle, so that the inkjet nano-silver conductive ink has the characteristics of high nano-silver concentration, low post-treatment temperatureand good dispersion stabilization, and is particularly suitable for being printed on flexible substrate.

The invention provides a preparation method of a silver phosphate photocatalyst, and relates to the field of catalysts. The preparation method comprises the following steps: (1), sequentially adding silver acetate and phosphoric acid water solution into polyethylene glycol 200, adjusting the pH value to be 5 to 6, and reacting at stirring state; and (2), performing centrifugation to take precipitate after the reaction in the second step is accomplished, washing the precipitate, and then obtaining the silver phosphate photocatalyst after drying. The preparation method is simple, low in cost, energy-saving and environmentally friendly, and does not produce accessory substance. The silver phosphate photocatalyst obtained through the preparation method has a novel tubular microcellular structure and high photocatalytic activity.

The invention relates to a water soluble Pt(II) catalyst precursor free from chlorine and nitrate and a synthetic method thereof. The invention discloses a precursor compound: tetraammineplatinumdiacetate for preparing a supported platinum catalyst, wherein the molecular formula is [Pt(NH3)4](CH3COO)2.nH2O, n=0, 1. The compound is prepared by the step of performing reaction of tetraammineplatinum chloride hydrate as a starting raw material and silver acetate to obtain the target compound tetraammineplatinumdiacetate. The yield is greater than 95%. The compound as the precursor has the characteristics that (1) the compound is free from elements such as chlorine, sulphur and phosphorus harmful to catalysis; (2) the compound is quite high in water solubility and can be used as a the precursor of the highly supported platinum catalyst with the solubility in water reaching 80g / 100g; (3) the compound in aqueous liquor is dissociated to release stable complex cations [Pt(NH3)4]2+ to the benefit of absorbing the precursor compound by a carrier in impregnation; and (4) own redox reaction of the compound occurs at 300 DEG C to directly generate platinum without gases harmful to the environment. The precursor is an ideal precursor for the supported catalyst by an impregnation method.

The method includes following steps: (1) preparation of self-assembly substrate, offering a P type Si(100) substrate that is treated by ultrasonic in organic solvent; after treated by placing into Piranha solution, and it is dried by blowing non-oxidizability gas, and then is treated by OTS solution and is cleaned up by using organic solvent; (2) nano-line etching, the nano-line is etched on self assembly substrate by using current of conduct atomic force microscope, the radius of curvature of pinpoint is less than 50 nm; (3) nanometer generating, the etched substrate is placed in the silver acetate for dipping, and then is taken out to place in ethanol in short time, and then is placed in sodium borohydride aqueous solution for dipping, washing, and then is dried by blowing non-oxidizbility gas, finally the silver enhancement solution is inputted for heighten the electrode line.

The invention discloses a method for preparing nano silver powder in viscous medium. The method comprises the following steps of: mixing sodium nonylphenol polyoxethyiene ether sulfate, TEA dodecylbenzenesulfonate, ammonium dodecylbenzenesulphonate, coconut oil alcohol acylamide, octadecyl dimethyl amine oxide, sodium carboxymethylcellulose, polyoxyethylene glycol 6000 bisstearate, ethylenediamine tetraacetic acid disodium salt, ethylene oxide, benzotriazole and deion water and stirring uniformly, preparing the viscous medium, adding silver acetate and silver lactate and stirring uniformly, adding sodium hypophosphite and stirring till full reaction, then adding the deion water for dilution according to a ratio of 1:1.5 of the all material amount to the deion water, reducing the viscosity, and obtaining the nano silver powder by pressure filtration, washing with the deionized water, washing with acetone and vacuum drying. The selected raw materials are easily obtained; the method is short in production process, high in production efficiency, low in production cost and low in energy consumption; the powder is not easily agglomerated, and the powder has good dispersibility; and the method is suitable for large-scale production, and solves the problems that the nano silver powder prepared by the conventional chemical preparation method is easily oxidized and easily agglomerated.

The invention discloses a synthesis method of beta, beta-diaryl alkene, which comprises the following steps that: in an organic acid solvent, in the presence of a palladium catalyst and a silver salt, a halogenated aromatic hydrocarbon and an end alkenyl compound are subjected to a coupling reaction to obtain the beta, beta-diaryl alkene, wherein the organic acid solvent is acetic acid, the palladium catalyst is palladium acetate, the silver salt is silver acetate, silver carbonate or silver oxide, the halogenated aromatic hydrocarbon is iodo aromatic hydrocarbon, and the coupling reaction is operated at a reaction temperature of 80 to 130 DEG C for 0.25 to 24 hours. With the method, the environmentally friendly organic acid is used as the solvent, and the silver salt is used as an additive; and the method has the advantages of small amount of catalyst, mild reaction conditions, simple post-treatment, and high yield of a product, without adding other ligands and the like.

The present invention relates to a method for industrial production of a nano-silver composite antibacterial agent. In the prior art, a particle size of nano-silver is large and is not easily adjusted, nano-silver is unstable and is easily agglomerated, and a particle size of nano-silver composite particles is non-uniform. A purpose of the present invention is mainly to solve problems in the prior art. According to the present invention, the method for producing the nano-silver composite antibacterial agent is provided, wherein the method comprises the following steps: a) mixing silane having an amine functional group, alkoxy silane, silver nitrate or silver acetate, and water to form a mixing liquid; b) pumping the mixing liquid into a rotation disc at a high-speed rotation state in a dryer, carrying out centrifugal atomization to obtain tiny liquid droplets, and carrying out cyclone drying with hot air to obtain dried particle powder; c) separating the particle powder with a cyclone separator, and then collecting to obtain the nano-silver composite antibacterial agent with a uniform particle size. With the present invention, problems in the prior art are solved, and the technical scheme of the present invention can be used in production of antibacterial materials with characteristics of long acting and broad spectrum.

The invention discloses agranular type silver-based conductive ink. The agranular type silver-based conductive ink is prepared from the following raw materials in percentage by weight: 20-55% of a metal silver salt, 30-50% of an alcohol amine solution, 10-30% of a reducing agent and 0.3-0.5% of an additive, wherein the metal silver salt is at least one of silver nitrate, silver citrate and silver acetate; the alcohol amine solution is prepared by mixing an alcohol solvent and an amine solvent in a volume ratio of 1: (0.5-3); the reducing agent is at least one of ascorbic acid and formic acid; and the additive is at least one of curdlan and carboxymethyl cellulose sodium. The invention further discloses a preparation method for the conductive ink and the application in preparing an RFID label antenna. The conductive ink disclosed by the invention is strong in stability, low in thermal treatment temperature, simple in preparation method and easy to realize industrial production.

The invention discloses a novel undoped and silver-doped non-lead full-inorganic sodium-indium-based double perovskite nanocrystal material, which is prepared from the following steps: adding a cesium-containing compound, sodium acetate, indium acetate and silver acetate into a flask, adding 1-octadecene, oleic acid and oleylamine, stirring and mixing, and vacuumizing at 100-110 DEG C for 1 hour;introducing nitrogen, heating to 180-185 DEG C at the speed of 4-8 DEG C / min, injecting a chlorine-containing compound at the temperature of 165-170 DEG C, quickly performing ice bath to room temperature when the temperature is 180 DEG C, centrifuging to remove supernatant, washing twice with methylbenzene, centrifuging to remove supernatant, dispersing precipitates into n-hexane, and centrifugingto remove the precipitates to obtain nanocrystal colloid. According to the invention, the preparation method is simple, the toxicity problem of the lead-based perovskite is solved, the stability of the perovskite nanocrystal is improved through silver doping, the fluorescence property of the perovskite nanocrystal is improved, and the perovskite nanocrystal material has a good application prospect in the photoelectric field.

A method of producing a hydrophilic polyurethane foam structure containing a silver salt, chosen from the group of silver sulphate, silver citrate, silver acetate, silver carbonate, silver lactate and silver phosphate, or a mixture of these salts includes the steps of (a) providing a water phase containing a surfactant, and at least one silver salt, wherein the at least one silver salt is dispersed in the water phase; (b) providing a isocyanate-terminated polyether having functionality of more than (2); (c) mixing the water phase and the isocyanate-terminated polyether, immediately transferring the resulting mixture to a mould whereby a foam structure is obtained; and (d) drying the foam structure until it has a moisture content of at most 10% (wt). The hydrophilic polyurethane foam structure produced by the method and a wound dressing containing the foam structure are also described.

The invention relates to a method for preparing ultrafine silver tungstate antibacterial powder by ultrasonic-homogeneous precipitation. In the method, the ultrafine silver tungstate antibacterial powder is prepared by using relation between solubility and temperature of silver tungstate and silver acetate and adopting a homogeneous precipitation method, namely silver ions in the solution are slowly and uniformly generated by using the chemical reaction of the silver tungstate and silver acetate, and the phenomenon of uneven local concentration of the system caused by direct addition of a precipitator is avoided. In the reaction process, the method utilizes the cavitation effect of ultrasonic waves to intensify the diffusion and uniform mixing of reaction raw materials, shorten the reaction time and make granularity small and uniform. The experiment shows that the reaction temperature under the ultrasonic environment is between 20 and 40 DEG C; the reaction time is between 15 and 45 minutes; the effect is good; and finally, the ultrafine silver tungstate antibacterial powder with average particle diameter of between 2 and 3 mu m is prepared. The antibacterial powder accounting for 1.5 to 3.0 weight percent of the total weight of dried glaze is applied to sanitary enamel to prepare antibacterial ceramics; the antibacterial rate is over 90 percent; and the appearance of the antibacterial ceramics has no discoloration and distortion.

The invention discloses a method for preparing a solvent system capable of dissolving cellulose under a room temperature condition. The solvent system is composed of ionic liquid and dimethyl sulfoxide, wherein anions in the ionic liquids are acetate ions, cations are N-R1 and N-R2 imidazole cations; in the formula, R1 is methyl or ethyl, R2 is ethyl, allyl or butyl. The method comprises the following preparation steps: mixing and fully dissolving N-methylimidazole or N-ethylimidazole and the dimethyl sulfoxide; slowly dripping bromo-hydrocarbon R2Br under an ice bath condition to react; heating to carry out a reflux reaction at a temperature of 40-70 DEG C; and adding a saturated lead acetate or silver acetate solution, stirring to react, filtering precipitate, and removing water in filtrate through a rotary evaporation method to prepare the solvent system. The method disclosed by the invention has the advantages that the preparation method is short in reaction time, free of pollution and high in synthesis efficiency and conversion rate; and the solvent system can dissolve a large amount of non-activated or non-pretreated cellulose under the room temperature condition.

The invention discloses a preparation method for an Ag3PO4 / TiOF2 composite photo-catalyst. The preparation method for the Ag3PO4 / TiOF2 composite photo-catalyst comprises the following steps: synthesizing TiOF2 by using a hydrothermal method, namely weighing 0.3-0.5g of TiF4 and adding to the lining of a hydrothermal reaction kettle, subsequently adding 20-30mL of n-butyl alcohol, quickly adding 0.1-0.2mL of hydrofluoric acid with a mass percent being 48% when TiF4 is not completely dissolved, sealing and covering the reaction kettle and subsequently putting the reaction kettle into an air-blowing drying box, carrying out hydrothermal reaction at 190-210 DEG C for 5-8 hours and washing a product after reacting for three times by using absolute ethyl alcohol to obtain a TiOF2 sample; weighing 0.12-0.62g of the TiOF2 sample, ultrasonically dispersing the TiOF2 sample in deionized water for 20-60 minutes to obtain TiOF2 suspension liquid; further weighing 0.2-1.0g of silver acetate, adding the silver acetate into the TiOF2 suspension liquid by stirring, dropwise adding 2-15mL of 0.15mol / L Na2HPO4 solution to form pale yellow sediment, washing the sediment with the deionized water for three times by centrifuging, and finally drying product at 80-100 DEG C in the air-blowing drying box for 10-15 hours to obtain the Ag3PO4 / TiOF2 composite photo-catalyst.

The invention provides a synthetic method and an application of a monodisperse silver iodide photocatalyst, which is characterized in that ethene diamine is taken as a silver ion control releaser, water or ethanol is taken as a solvent, polyvinylpyrrolidone is taken as a stabilizing agent, a potassium iodide solution is added in an silver acetate solution with certain uniform speed, by adjusting the composition and reaction time of the solvent, the hexagonal silver iodide nano polyhedron, nanosphere or nano concave body with characteristics of uniform size, uniform dispersion and structured shape can be conveniently and rapidly prepared. The synthetic method can solve the problems of tedious process, long period and poor uniformity of product in prior art, the preparation process is simple and rapid, the synthesis condition is mild, the catalyst morphology is controllable, thereby the monodisperse silver iodide photocatalyst is convenient for scale production, and the synthesized catalyst has high visible photocatalytic activity for degrading the organic pollutants.

The invention relates to a preparation method for metallic element-doped graphene quantum dots, specifically to a hydro-thermal preparation method for silver-doped graphene quantum dots, belonging tothe technical field of nano-materials. The hydro-thermal preparation method for the silver-doped graphene quantum dots is characterized in that sugar and silver acetate produce the water-soluble metalsilver-doped graphene quantum dots under hydrothermal reaction conditions. According to the invention, metal silver ions are introduced into graphene quantum dots, and the energy level structure of the graphene quantum dots is adjusted so as to all the graphene quantum dots to have more excellent photoelectric performance. The preparation method is simple in process, low in cost for raw materials, simple in equipment and beneficial for large-scale production of enterprises; and the prepared quantum dots have good water-solubility, substantial fluorescence properties, and important applicationvalue in fields like photocatalysis, photoelectrons, solar cells and chemical sensing.

The invention discloses a reversed-phase microemulsion for removing harmful chloride ions from a bronze ware. The reversed-phase microemulsion comprises oil phase, aqueous phase, a mixed surfactant and cosurfactant, wherein the oil phase is cyclohexane, the aqueous phase is a silver acetate aqueous solution, the mixed surfactant comprises the following components in percent by volume: 55-65% of polyoxyethylated castor oil, 35-45% of span-80, the cosurfactant is any one of ethyl alcohol, n-butyl alcohol, isobutanol and n-amyl alcohol, the volume ratio of the cosurfactant to the surfactant is 1: (0.3-2). The reversed-phase microemulsion for removing harmful chloride ions from a bronze ware is stable and white transparent in color, has good permeability, wettability, levelling property and rheological property, easily permeates into and act on bronze cultural relics with complex surface appearance and ornamentation, effectively removes harmful chloride ions from bronze wares, does not pollute the surfaces of the bronze cultural relics, and is strong in operability.