601 results about "Copper nanoparticle" patented technology

A method for making nanoparticles includes the steps of dipping a metal element in a solution that contains metallic ions or ions with a metal, wherein the metal element has a lower electronegativity or redox potential than that of the metal in the ions, and rubbing the metal element to make nanoparticles. Another method for making nanoparticles includes the steps of dipping a metal element in a solution that contains metallic ions or ions with a metal, wherein the metal element has a lower electronegativity or redox potential than that of the metal in the ions, and applying sonic energy to at least one of the metal element and solution. A further method for making copper nanoparticles includes the step of adding ascorbic acid to a copper salt solution.

Forming a conductive film comprising depositing a non-conductive film on a surface of a substrate, wherein the film contains a plurality of copper nanoparticles and exposing at least a portion of the film to light to make the exposed portion conductive. Exposing of the film to light photosinters or fuses the copper nanoparticles.

The present invention relates to a method for manufacturing copper nanoparticles, in particular, to a method for manufacturing copper nanoparticles, wherein the method includes preparing a mixture solution including a copper salt, a dispersing agent, a reducing agent and an organic solvent; raising temperature of the mixture solution up to 30-50° C. and agitating; irradiating the mixture solution with microwaves; and obtaining the copper nanoparticles by lowering temperature of the mixture solution.

According to the present invention, several tens of nm of copper nanoparticles having a narrow particle size distribution and good dispersibility can be synthesized in mass production.

A colorimetric reagent in the form of nanoparticles, composite nanoparticles, and nanoparticle coatings, including methods of use, methods of preparation, deposition, and assembly of related devices and specific applications. The colorimetric reagent comprises cerium oxide nanoparticles which are used in solution or immobilized on a solid support, either alone or in conjunction with oxidase enzymes, to form an active colorimetric component that reacts with an analyte to form a colored complex. The rate of color change and the intensity of the color are proportional to the amount of analyte present in the sample. Also described is the use of ceria and doped ceria nanoparticles as an oxygen storage/delivery vehicle for oxidase enzymes and applications in biocatalytic processes in anaerobic conditions of interest in biomedicine and bioanalysis. Further described are a variety of related applications of the disclosed technology including clinical diagnosis, in vivo implantable devices, food safety, and fermentation control.

Improved functionality of phase change materials (PCM) through dispersion of nanoparticles is described. The resulting nanoparticle-enhanced phase change materials (NEPCM) exhibit enhanced thermal conductivity in comparison to the base material. Starting with steady state natural convection within a differentially-heated square cavity that contains a nanofluid (water plus copper nanoparticles), the nanofluid is allowed to undergo solidification. Partly due to increase of thermal conductivity and also lowering of the latent heat of fusion, higher heat release rate of the NEPCM in relation to the conventional PCM is observed. The predicted increase of the heat release rate of the NEPCM is a clear indicator of its great potential for diverse thermal energy storage applications.

Disclosed are amorphous carbon nanofibers including copper nanoparticles or copper alloy nanoparticles, copper composite nanoparticles prepared by grinding the amorphous carbon nanofibers and implemented as surfaces of Cu-included particles are partially or wholly coated with amorphous carbons, a dispersed solution including the copper composite nanoparticles, and preparation methods thereof and the amorphous carbon nanofibers include nanoparticles including copper, copper nanoparticles or copper alloy nanoparticles, and, the copper composite nanoparticles are implemented as surfaces of Cu-included particles are partially or wholly coated with amorphous carbons.

The present invention is directed toward oxidation-resistant, ligand-capped nanoparticles, each comprising one or more capping ligands on a copper-containing core. Methods of making and using these nanoparticles are also disclosed.

The present invention provides a process for producing copper nanoparticles, comprising steps of: a) reacting an aqueous solution containing a reductant with an aqueous solution of a copper salt while stirring for 1-8 min, wherein the reductant being one or more selected from a group consisting of hydrazine hydrate, sodium borohydride and sodium hypophosphite; b) adding an apolar organic solution containing the extracting agent and continuing the stirring for 0.5-1.5 hrs, said extracting agent being one or more selected from the group consisting of alkyl dithiocarbonic acid and salts thereof, O,O′-dialkyl dithiophosphoric acid and salts thereof, and dialkylamino dithioformic acid and salts and said apolar organic solution being one selected from the group consisting of benzene, toluene and straight or branched alkanes having 6-12 carbon atoms, wherein the alkyl having 6-20 carbon atoms; and c) post-treating the reaction product to obtain copper nanoparticles.

Procedures and methods for synthesizing biodegradable polymer coated nanoceria result in stable nanoparticle preparations in aqueous systems and physiological relevant colloidal solutions, such as phosphate buffer saline. The coated nanoceria preparations increase the nanoparticle concentration in aqueous or colloidal solutions as most needed for antioxidant, free-radical scavenger, and autocatalytic biomedical applications, including, biological, pharmacological and potential clinical use. To meet this need, a facile synthetic procedure for preparation of a biodegradable polymer-coated nanoceria is disclosed; the preferred biodegradable polymer is dextran. The synthesis method occurs under ambient conditions in an aqueous phase without the use of surfactants and results in a monodispersed preparation that is dextran-coated as determined by dynamic light scattering (DLS). Preliminary characterization of polymer coated nanoceria by XPS, TEM, XRD, and the like shows that these nanoparticles have the necessary physical properties for the desired biological potency, such as Ce⁺⁴/Ce⁺³ mixed valence state.

The invention discloses a graphene-copper nanoparticle composite, and preparation and application thereof, and is characterized in that three-dimensional irregular multistage overlapped graphene sheet layers are formed on a grinded glassy carbon electrode or a dry pure titanium piece subjected to the surface treatment, the graphene sheet layers are in different sizes and are overlapped at different directions, and some graphene sheet layers are tilted; copper nanoparticles are densely compounded on the graphene sheet layers. The invention further provides a preparation method of the graphene-copper nanoparticle composite, the method is simple and easy, green and environmental friendly, and the glassy carbon electrode decorated by the graphene-copper nanoparticle composite prepared by the method has good application in the aspect of an electrochemical sensor.

The invention provides nanoparticles consisting of a polymer which is a metal chelating agent coated with a magnetic metal oxide, wherein at least one active agent is covalently bound to the polymer, said nanoparticles may optionally further comprise at least one active agent physically or covalently bound to the outer surface of the magnetic metal oxide. Pharmaceutical compositions comprising these nanoparticles may be used, inter alia, for detection and treatment of tumors and inflammations.

The invention relates to a core-shell structure copper nanoparticle and a preparation method thereof. The core-shell structure copper nanoparticle comprises a copper core and a silicon dioxide shell covering the surface of the copper core, wherein the grain diameter of the copper core is 40-450 nanometers; the thickness of the silicon dioxide shell is 5-50 nanometers. The silicon dioxide shell is capable of effectively preventing oxygen in air from permeating, the oxidation of the copper core is prevented, and the core-shell structure copper nanoparticle has excellent oxidation resistance.

The invention discloses an industrial production method of a copper nanoparticle. The industrial production method comprises the following steps of: firstly, selecting a precursor: selecting a copper compound with the purity of over 98 percent as the precursor; secondly, pretreating the precursor: adding the copper compound selected in the first step and an additive into absolute ethyl alcohol for dissolving and uniformly stirring to obtain an ethanol mixed solution, wherein the additive is a surface coating agent and/or a surfactant; thirdly, adding a reducing agent: adding the reducing agent into the ethanol mixed solution and obtaining a mixed solution in which the reducing agent is added, wherein the reducing agent is hydrazine hydrate; fourthly, carrying out reducing treatment; and fifthly, carrying out subsequent treatment. The invention has the advantages of simple process steps, short production flow, simpleness and convenience for operation and low input cost; the produced copper nanoparticle has high quality; and the actual problems of complex process flow, high input cost and poorer stability of the produced copper nanoparticle and the like in a traditional production method of the copper nanoparticle can be effectively solved.

The invention discloses a preparation method for platinum-copper nano-particles with controllable morphologies. The preparation method comprises the following steps: 1) mixing a reductive organic solvent, a platinum source and a copper source to obtain a mixed solution A; 2) heating and stirring the mixed solution A at 80-130 DEG C and under the condition of inert atmosphere protection until all solid reagents are completely dissolved to obtain a solution B; 3) stopping charging the inert gas, and charging a gas C in the solution B; and 4) heating the solution B to 210-250 DEG C and insulating heat to obtain a suspension D, cooling the suspension D to room temperature, centrifuging, taking bottom precipitates, and centrifugally washing the bottom precipitates by virtue of an organic solvent to obtain black precipitates, that is, the platinum-copper nano-particles. The method is simple and practicable, and the octahedral platinum-copper nano-particles are obtained through controllable synthesis; and moreover, the platinum-copper nano-particles obtained by the method are monolayer-dispersed and uniform in dimension, and have an average particle diameter of less than 10nm. The platinum-copper nano-particles can be used as a nano-catalytic material.

The present invention relates to production of composite materials utilizing an electroless deposition method for coating substrates with bismuth, antimony, tin, silicon, cobalt and their various compositional alloys. Substrates may be materials comprised of copper, brass, carbon, and silicon. These substrates are immersed in aqueous or ethylene glycol based solutions containing soluble ions of the desired coating material. The present invention generates desired coatings at room temperature during a period of immersion of one hour or less. In one exemplary embodiment, the method provides the electroless deposition of silicon onto copper nanoparticles in a room temperature solution of ethylene glycol. The coated nanoparticles may then be processed to form a battery electrode. In another exemplary embodiment, the method provides electroless deposition of tin onto brass foil in a room temperature aqueous solution. Battery electrodes may then be punched from the coated sheet.

The invention relates to a sintered neodymium-iron-boron-based permanent magnet material with high coercive force and high corrosion resistance, prepared by doping copper nano-particles, and a preparation method thereof, belonging to the technical field of magnetic materials. The preparation method comprises the following steps of: adding Cu nano-powder with average particle size of 100-500nm into neodymium-iron-boron-based powder which is of 3-5 mu m, and uniformly mixing, wherein the adding proportion of the Cu nano-powder is 0.2-2.5% of the weight of the neodymium-iron-boron-based powder; performing orientation and press-forming in a 2.5T magnetic field; placing into a vacuum sintering furnace, then increasing the temperature to 1020-1120 DEG C for sintering for 2-4 hours, and finally performing two-stage heat treatment to get the sintered neodymium-iron-boron magnetic material, wherein the temperature of first-stage heat treatment is 830 DEG C-930 DEG C, and the time is 1-3 hours; and the temperature of second-stage heat treatment is 480 DEG C-630 DEG C and the time is 1-3 hours. The coercive force and the corrosion resistance of the neodymium-iron-boron-based permanent magnet material can be greatly improved through the process of adding the nano-Cu powder, sintering and performing the heat treatment.

The invention discloses special lubricating oil for a fuel gas engine of a public transport automobile. The special lubricating oil is prepared from blended base oil, binary ethylene-propylene rubber, polymethacrylate, alkylphenol calcium sulfide, high-base-number calcium alkylbenzenesulfonate, polyisobutylene succinimide, boronated polyisobutylene succinimide, alkylated phenyl-alpha-naphthylamine, p,p'-dioctyl diphenylamine, a hindered phenol type antioxidant, dialkyl molybdenum dithiocarbamate, copper nanoparticle anti-wear additives, methyl silicone oil and thiadiazole polysulfide. According to the lubricating oil composition oil product, the sulfate ash content is lower than 0.5%, the content of phosphorus is lower than 0.03%, and the base number is 3-8mgKOH/g. According to the special lubricating oil for the fuel gas engine of the public transport automobile, aiming at the special requirements of the public transport automobile on engine oil, different additive varieties and charging sequences are adopted, so that physical and chemical indicators and use performance of the special lubricating oil are better than natural gas engine lubricating oil of the same grade, and the special lubricating oil has excellent cleaning and dispersion properties, lubricating property, abrasion resistance and oxidation resistance.

The invention provides non-oxidized nano copper soldering paste for high-power chip packaging and a preparation method of the soldering paste. Copper nanoparticles with the non-oxidized surfaces with the particle size being 30-60 mu m and an organic solvent are mixed in the mass ratio of 2:1-5:1, mechanical stirring and planet type gravity stirring are performed, and the nano copper soldering paste is obtained. The invention further provides the preparation method of the copper nanoparticles with the non-oxidized surfaces. The non-oxidized nano copper soldering paste prepared with the method has higher conductivity and better mechanical properties than common nano copper soldering paste and tin-lead solder. The preparation method is simple and practical and causes no environmental pollution and industrial popularization and application can be realized.

The invention relates to a preparation method of silver coated copper nanoparticles capable of being used for conductive ink. The method comprises the steps that a copper precursor, a protective agent and a reducing agent are dissolved in an organic solvent, the mixture is heated, and a nanocopper solution is obtained; a silver nitrate solution is added into the nanocopper solution, then cooling, centrifugation and drying are carried out, and the silver coated copper nanoparticles capable of being used for the conductive ink are obtained. The silver coated copper nanoparticles capable of being used for the conductive ink are prepared through a continuous reduction and replacement method. In the preparation process, no complex chelating agent is added, the intermediate processes of separation and purification, activation and sensitization and the like are not needed, and the reaction conditions are free of pollution and mild. In addition, the silver coated copper nanoparticles prepared through the preparation method are good in dispersity, high in monodispersion degree, high in oxidation resistance and capable of being produced in a large scale and applied to the field of the conductive ink.