62 results about "Silver particles" patented technology

The application relates to a fruit and vegetable packaging film based on a MOF material, which comprises the following components: polyvinyl alcohol, modified polylactic acid, Ag@MOF nanoparticles, plant extract, glycerol, and a solvent; wherein the modified polylactic acid is obtained by reaction of acrylamide, double-bond polylactic acid, vinyl acetate and KH570 modified nano-silver particles. Through the synergistic effect of the modified polylactic acid and components such as polyvinyl alcohol, Ag@MOF nanoparticles and plant extract, the mechanical properties, compatibility, antibacterial property, barrier property and preservation performance of the packaging film are significantly improved, the degradability of the material is ensured, and the application has important significance for promoting the development of the fruit and vegetable preservation packaging industry.

A natural graphite composite negative electrode material and a preparation method therefor, and a lithium-ion battery. The natural graphite composite negative electrode material comprises natural graphite, a fluffy net-shaped three-dimensional carbon network that coats the natural graphite, and an amorphous carbon coating layer arranged outside the fluffy net-shaped three-dimensional carbon network, wherein magnesium ions and / or aluminum ions are dispersed in the fluffy net-shaped three-dimensional carbon network, and the amorphous carbon coating layer is doped with copper particles and / or silver particles. The natural graphite composite negative electrode material has a three-dimensional conductive network, is doped with metals, and has a good conductivity and electrochemical cycle performance.

The present application relates to a kind of silver powder with high sintering activity, the silver powder is spherical, its surface has loose porous structure, purity is above 99%, and particle size D50 is based on the change of reaction system formula and reaction condition in its preparation process and kept in 0.1~3.0 μm adjustable interval. Meanwhile, the preparation method of the silver powder is disclosed.The present application indirectly adds flocculent hydroxide as heterophase crystal nucleus in the synthesis process of silver powder, and the silver particles reduced around flocculent heterophase crystal nucleus grow uniformly, so that it has loose porous structure, is conducive to the conduction of hot air, so as to realize low-temperature sintering.

This invention belongs to the field of battery technology. It provides a pre-lithiation separator, its preparation method, and its applications. The pre-lithiation separator includes a separator substrate with a coating. The coating includes a lithiophilic material, a reinforcing material, and a binder. The lithiophilic material includes at least one of copper oxide particles, graphene, silver particles, or gold particles. The reinforcing material includes inorganic non-metallic particles. A lithium metal layer is disposed on the side of the coating away from the separator substrate. The lithiophilic material has a strong affinity for lithium, promoting uniform lithium deposition and enhancing the binding between the separator and lithium. The reinforcing material enhances the heat resistance and mechanical properties of the separator, resisting damage to the separator during the preparation of the lithium metal layer. By setting this specific coating, the lithium uniformity of the pre-lithiation separator can be fundamentally improved, thereby enhancing the mechanical properties and heat resistance of the pre-lithiation separator, which is beneficial for further improving battery performance.

The present invention relates to a porous silver-carbon composite material containing a carbon powder. The carbon powder contains porous carbon particles, wherein the carbon particles contain pores having an open and continuous pore structure. Furthermore, the porous silver-carbon composite material contains silver particles, wherein at least some are bound to the surface of the porous carbon particles. The silver-carbon composite material can be used for electrodes of solid-state batteries.

The application relates to the technical field of composite materials, in particular to a high-conductivity thermosetting resin-based composite material and a preparation method thereof, which contains the following components in parts by weight: 50-80 parts of epoxy resin, 10-30 parts of conductive carbon nanotubes, 20-40 parts of nano silver particles, 10-20 parts of functionalized polyurethane prepolymer, 5-15 parts of polyamine curing agent, 2-8 parts of organic silane coupling agent, 5-15 parts of graphene nanosheet, 5-15 parts of aluminum borate whisker, 5-15 parts of barium titanate nanoparticles, 2-10 parts of conductive polymer microspheres, 1-5 parts of nano zinc oxide; wherein the conductive polymer microspheres comprise a core composed of polyaniline or polypyrrole, and polyurethane polymer or polyacrylate polymer wrapped outside the core; the core surface is modified by nano silver particles and gamma-aminopropyl triethoxysilane; the conductive polymer microspheres are used for providing a long-range conductive path, the nano silver particles are used for providing short-range conductive connection, and the conductive polymer microspheres and the nano silver particles form a multi-level conductive network.

The present application relates to the technical field of solar interface evaporation, in particular to a light-vapor conversion composite hydrogel sponge and a preparation method and application thereof.The present application provides a preparation method of a light-vapor conversion composite hydrogel sponge, comprising: mixing carbonized coffee powder, sodium alginate and a solution containing lignin-coated nano-silver particles to obtain a mixed solution, soaking polyurethane sponge in the mixed solution, taking out the polyurethane sponge after absorbing the mixed solution, adding calcium chloride, and drying to obtain the light-vapor conversion composite hydrogel sponge.The present application combines biomass waste coffee grounds and lignin-reduced silver to construct a light-vapor conversion composite hydrogel sponge with low water evaporation enthalpy, high thermal efficiency, stable water supply and cyclic stability on the double network of polyurethane and hydrogel.

The application relates to the technical field of electronic information materials, in particular to a high-stability coffee ring resistant nano-silver jet printing ink, a preparation method and application. According to weight percentage, the preparation raw material of the nano-silver jet printing ink comprises 20-30% of nano-silver particles and the balance of mixed solvents; the nano-silver particles are zero-dimensional spherical particles coated with a stabilizer; and the mixed solvents comprise a first solvent, a second solvent, a third solvent and a fourth solvent with different boiling points. The application is innovative, and the specific four-component solvent compound system, the step-by-step filtration process and the rapid infrared sintering process are synergistically combined, so that the coffee ring effect is fundamentally inhibited while the excellent printing stability is ensured, and the high-performance ink with high uniformity and high-precision conductive patterns is obtained.

The application discloses a kind of two-component modified binary polymer nanofiber array and its molecular model, preparation method and application, two-component modified binary polymer includes polyvinyl alcohol, chitosan, carbon nanotube, silver particle four components.Polyvinyl alcohol is grafted chitosan with hydrogen bond, polyethylene-chitosan is grafted carbon nanotube with covalent bond, silver particle is dispersed and supported in the gap and surface of polyethylene-chitosan-carbon nanotube nanofiber array.Polyvinyl alcohol and chitosan binary polymer have high interface affinity and stability, carbon nanotube has the function of dispersing binary polymer and electrical conductivity, silver component has electrocatalytic activity and electrical conductivity function, the two-component modified binary polymer nanofiber array obtained by the application has electrocatalytic reduction hydrogen peroxide, is applied to the construction of electrochemical sensor, realizes the high sensitivity and high stability detection hydrogen peroxide performance.

The application belongs to the technical field of electrochemical analysis methods, and particularly relates to an aptamer electrochemical sensor for detecting homocysteine and a preparation method thereof. The preparation method of the aptamer electrochemical sensor for detecting homocysteine provided by the application comprises the following steps: preparing a single-walled carbon nanohorn modified carbon ionic liquid paste electrode, electrodepositing nano silver particles, incubating aptamers, and sealing non-specific sites that are not occupied, so as to obtain MCH / Apt / AgNPs / SWCNHs / CILPE. In the detection of Hcy, a wide linear range (0.5 nM-100 nM) and a low detection limit (0.1 nM) are exhibited, and meanwhile, good reproducibility, stability and anti-interference ability are also possessed, and the aptamer electrochemical sensor has been successfully applied to the detection of Hcy in human serum samples.

This invention provides a method for recovering silver from waste silver plating solution, belonging to the field of heavy metal industrial wastewater treatment technology. The invention involves adding sodium hypophosphite to waste silver plating solution containing complexed silver. After the sodium hypophosphite dissolves, the pH of the system is adjusted to alkaline. A reduction reaction is then carried out under heating conditions to generate elemental silver particles. This invention utilizes the in-situ generation of hydrogen free radicals from sodium hypophosphite under alkaline heating conditions to achieve direct reduction and complex breaking of stable silver nicotinic acid complexes and elemental silver conversion. This process is completed in one step, simplifying the traditional complex multi-step process of "oxidation-complex breaking-ion release-chemical precipitation" into a single reduction step, significantly shortening the treatment process and improving the reaction rate and treatment efficiency.

This invention belongs to the field of silver powder preparation technology and discloses a preparation process for highly dispersible silver powder. The method uses an aminosilane-modified bacterial cellulose hydrogel as a biological template, and employs vacuum assistance to fully adsorb silver ions into its three-dimensional network pores. Subsequently, using Shewanella bacterial culture, a microbial in-situ reduction reaction is carried out within the template pores under microaerobic conditions, converting silver ions into elemental silver particles. The template's confinement effect effectively isolates the particle growth space. Finally, the template is removed by enzymatic desorption, and the silver powder is obtained by freeze-drying. This invention solves the problems of low product purity and uneven particle size caused by the addition of chemical dispersants in existing chemical reduction methods, and the problems of easy free migration, collision, and severe agglomeration of particles in microbial reduction methods. This invention has the advantages of a green and mild process with low energy consumption, and the prepared silver powder has uniform and controllable particle size, high dispersibility, and high purity.

This invention provides a silver fluoride composite silicon-carbon material, its preparation method, and its application, relating to the field of silicon-carbon material technology. The preparation method includes: mixing a silicon-carbon matrix, a silver source, and a carbon source in a liquid environment, followed by evaporating the solvent to obtain a composite precursor; heat-treating the composite precursor in an inert atmosphere at 400℃-600℃ to obtain a composite intermediate; and fluorinating the composite intermediate to obtain the silver fluoride composite silicon-carbon material. This invention, by coating the surface of the silicon-carbon matrix with a buffer layer containing nano-silver fluoride particles, helps to constrain the volume expansion of silicon during cycling and maintain the integrity of the electrode structure. Furthermore, the heterojunction formed between the buffer layer and the silicon-carbon matrix can reduce interfacial impedance and induce the formation of a dense lithium fluoride-based SEI film, effectively improving structural stability. Simultaneously, the formation of C-F bonds enhances interfacial bonding and promotes lithium-ion migration, contributing to improved cycling performance.

This invention discloses a flexible bipolar plate, its preparation method, and its application, belonging to the field of flow battery materials technology. It utilizes foamed metal as a conductive framework and a PDMS / epoxy resin mixture as a matrix to achieve a bipolar plate that combines flexibility and high conductivity. A polydopamine layer containing silver monomers is in-situ coated onto the surface of the foamed metal using a one-pot method, ensuring uniform silver growth on the foamed metal framework. Subsequently, calcination carbonizes the polydopamine layer, forming a composite conductive network of silver / carbon layer / foamed metal, further improving the conductivity of the flexible bipolar plate and enhancing the energy efficiency and voltage efficiency of the flow battery. Furthermore, the introduction of mercaptobenzoic acid and silane coupling agents enhances the compatibility of silver particles, PDMS, and epoxy resin, preventing damage caused by defects during bending and improving the reliability of the flexible bipolar plate, thus enhancing the long-term stability of the flow battery stack performance.

Provided are a composition capable of producing a cured product having low volume resistivity, a cured product obtained by curing the composition, and a method for producing a cured product using the aforementioned composition. A composition includes: (A) component: at least one metal particle selected from the group consisting of copper particles and silver particles; (B) component: at least one cashew component selected from the group consisting of cashew oil and cashew oil modified resin; and, (C) component: curing agent. Also provided is a cured product obtained by curing the aforementioned composition. Further, a method for producing a cured product includes: a coating step of coating the aforementioned composition on a substrate; and, a curing step of heating the aforementioned substrate on which the aforementioned composition is coated to cure the aforementioned composition.

The present invention provides a silver sintered body obtained from a silver paste that offers high bonding reliability during firing. [Solution] Some aspects of the present invention relate to a silver sintered body comprising silver particles and a silver compound, wherein the content of the silver compound is in the range of 0.31% by weight or more and 14% by weight or less of the total weight of the silver sintered body.

This invention provides a high-precision two-component copper etching solution and its preparation method. The etching solution comprises a component A and a component B: component A contains hydrogen peroxide, phosphoric acid, and 8-hydroxyquinoline; component B contains silver-sealed mesoporous silica nanoparticles, citric acid, and ethoxylated acetylenol. The silver-sealed mesoporous silica nanoparticles use thiolized mesoporous silica as a carrier, internally loading the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt, and the surface forms a sealing layer by thiol-binding the silver nanoparticles. During use, the two components are mixed, and hydrogen peroxide and phosphoric acid oxidize and dissolve the silver nanoparticle sealing layer, releasing the ionic liquid. This invention improves storage stability through a two-component design and enables on-demand release of the ionic liquid, suppressing lateral etching in the later stages of etching, improving the precision of copper etching and the flatness of the copper surface, making it suitable for fine circuit processing.

The application discloses a method for identifying and detecting carotenoids based on potential regulation SERS, which comprises the following steps: preparing a carbon-based microelectrode, preparing a nano-silver particle modified SERS active microelectrode, constructing a carotenoid detection system, qualitatively analyzing carotenoids, and quantitatively analyzing carotenoids. The application provides a method for screening different carotenoids by potential regulation, realizes rapid enrichment of fat-soluble carotenoids which are not easy to be adsorbed on a SERS active substrate, enhances the sensitivity of SERS detection of carotenoids, is simple to operate, low in cost, and is a new method and new technology urgently needed for food safety analysis and detection.

The present invention provides a conductive composition that can form a conductive metal film with excellent adhesion, conductivity, and plating resistance, even when fired at relatively low temperatures. [Solution] A conductive composition is prepared containing silver-containing metal nanoparticles (A), silver particles (B), and glass particles (C). The particle size of the silver-containing metal nanoparticles (A) is less than 200 nm. The particle size of the silver particles (B) is 200 nm or more. The mass ratio of the silver-containing metal nanoparticles (A) to the silver particles (B) is 40 / 60 to 99 / 1. The softening point of the glass particles (C) is less than 500°C. A laminate may be prepared containing a substrate and a conductive metal film laminated on at least one surface of the substrate and formed from a sintered body of the conductive composition.

A laminate includes: a substrate, and a silver particle layer disposed on the substrate and containing silver particles, wherein the silver particle layer L * a * b * L in the color system * It has a value of 75 or higher and is radio wave permeable.

This invention discloses a method for preparing flower-shaped silver powder. The method includes: 1. Preparing a silver nitrate solution to obtain solution A; 2. Preparing equal volumes of ascorbic acid solution and soy albumin solution, and mixing them to obtain solution B; 3. At room temperature, simultaneously and symmetrically adding solution A and anhydrous ethanol to solution B to react, allowing the generated silver particles to settle, be washed, and dried to obtain flower-shaped silver powder; applying this flower-shaped silver powder to low-temperature silver paste and Raman-enhanced substrates. The preparation method of this invention effectively controls the morphology of the reduced product silver powder through the synergistic effect of soy albumin and ethanol, preparing flower-shaped silver powder with a multi-level nanostructure. This flower-shaped silver powder has good dispersibility and high activity, and the preparation process is simple, efficient, environmentally friendly, and easy to scale up for production, making it suitable for fields such as electronics, catalysis, and biomedicine.

The application belongs to the technical field of electronic power device packaging interface materials, and specifically discloses a low-temperature sinterable copper-containing conductive paste as well as a preparation method and application thereof.The paste comprises the following components in percentage by weight: copper-containing particles 20-80%; nano silver flake 10-60%; nano silver particles 1-20%; and organic carrier 1-10%.The organic carrier comprises a solvent and a PEG homopolymer.The application uses copper-containing particles as the main conductive filler, combines the nano silver flake and nano silver particles of specific sizes to form a dense sintering network, and uses the reducing atmosphere generated by the pyrolysis of the PEG homopolymer during the sintering process to effectively inhibit copper oxidation, so that low-temperature sintering at 200-280 DEG C can be achieved.The paste preparation method is simple, the sintered paste has high conductivity, high thermal conductivity, high shear strength and good oxidation resistance, and can be used as a chip packaging and connecting material for power semiconductor devices.

The application provides a Ti3C2T x Ag composite particle reinforced copper-based self-lubricating material and a preparation method thereof, and relates to the technical field of metal matrix composite materials. The method comprises the following steps: etching Ti3AlC2 powder to obtain multilayer Ti3C2T x particles; then, silver particles are plated on the surfaces of the Ti3C2T x particles by a chemical plating process to obtain Ti3C2T x Ag composite particles; and finally, the composite particles are mixed with copper-based powder, and the mixture is formed and sintered by a powder metallurgy process to obtain Ti3C2T x Ag composite particle reinforced copper-based self-lubricating material. The application solves the problems of easy agglomeration of Ti3C2T x and silver particles in the matrix and uneven dispersion by constructing a core-shell structure of the reinforcing phase, realizes lubrication synergy of the two at different temperatures, and has the advantages of simple operation, economy, good repeatability, excellent tribological performance of the prepared material, and widened application of copper-based composite materials.

The application belongs to the technical field of electronic paste, and discloses a super-low-resistance paste for a stainless steel heating element and a preparation method thereof. ZnO nanowires are added to the resistance paste to fill the gaps between silver particles, so that the square resistance is reduced to less than 200 mΩ / □. On the other hand, the Bi-Mo glass system is used as a sintering aid, and compared with the traditional glass, the Bi-Mo glass system has a lower change rate of high-temperature sintering, higher resistance stability and higher mechanical strength. The application has significant advantages in conductivity, thermal stability and mechanical properties through the synergistic innovation of ZnO nanowire bridging and the Bi-Mo glass system, and is especially suitable for the field of high-precision electronic devices.

A conductive composition is disclosed. The conductive composition includes a plurality of silver particles and one or more cellulose-based binders. The composition also includes an amount of glass frit, an organic solvent and a plurality of carbon nanotubes, where the conductive composition is formed into a cross-sectional triangular shape, which may include a top cross-sectional dimension and a bottom cross-sectional dimension, where a ratio of the top cross-sectional dimension to the bottom cross-sectional dimension is 0.8 or less. A screen-printed gridline and a method of printing gridlines is also disclosed where the gridlines may be incorporated into a solar cell device.

The application relates to the technical field of fibers, and discloses an antibacterial far-infrared fiber and a preparation method thereof. The preparation method comprises the following steps: introducing an antibacterial unit hydroxyethyl hexahydro-sym-triazine into polyurethane acrylate, polymerizing the polyurethane acrylate with acrylate monomers, performing surface modification on far-infrared material nano-zirconium dioxide, further grafting 8-hydroxy quinolinyl group chelated silver particles, forming an antibacterial agent with far-infrared heating and antibacterial properties, introducing the antibacterial agent into chemical fiber slices, and endowing the fiber with far-infrared heating and antibacterial properties, and effectively enhancing the flexibility and mechanical properties of the fiber.

This silver powder comprises an aggregate of silver particles. The tap density TD is no greater than 2.3 g / cm3. The value of SSA / TD, which is the ratio of the BET specific surface area SSA [m2 / g] with respect to the tap density TD [g / cm3], is 1.5 or below. The aspect ratio, which is the ratio of the major axis length to the minor axis length of the silver particles, is 3.5-12.0. The value of SSA × D50, which is the product of the BET specific surface area SSA [m2 / g] and the volume-cumulative particle diameter D50 [μm] at 50% cumulative volume by the laser diffraction / scattering particle size distribution measurement method, is preferably 2.6 or below.