178 results about "Gold particles" patented technology

Disclosed herein is a gold powder comprises gold particles, and sulfur present on a surface of at least a part of the gold particles. A sulfur amount of the sulfur present on the surface per unit surface area is 220 μg / m2 or more and 1500 μg / m2 or less. The sulfur amount is obtained by dividing a surface sulfur amount per unit mass by specific surface area of the gold particles. The surface sulfur amount is obtained by a quantitatively analysis of a treated liquid obtained by nitric acid extraction of the gold particles.

The present application relates to the technical fields of propylene epoxidation catalyst, and discloses a propylene epoxidation catalyst, characterized in that the propylene epoxidation catalyst comprises a hierarchical pore titanium silicalite molecular sieve and nano gold loaded on the hierarchical pore titanium silicalite molecular sieve; wherein the content of the nano gold is 0.01wt%-1wt% based on the total amount of the propylene epoxidation catalyst; wherein the total pore volume of the propylene epoxidation catalyst is 0.18-0.56cm 3 / g, the particle size is 100-250nm, and the crystallinity is greater than or equal to 50%. By loading nano gold particles on the titanium silicalite molecular sieve with specific physical parameters under the condition of inert gas pressurization, the obtained catalyst has high catalytic activity when applied to propylene gas phase epoxidation reaction, the propylene conversion rate is increased to 10%-20%, and the selectivity of propylene oxide is increased to 90%-95%.

The invention belongs to the technical field of petroleum and natural gas mineral geochemical experiment research, and discloses a research method for a mechanism of extracting elemental gold in hydrothermal fluid from crude oil. In-situ visualization experiments are carried out in a transparent fused quartz capillary tube, and analysis is carried out in combination with a scanning electron microscope, an energy dispersion X-ray spectrum and a transmission electron microscope, so that continuous evolution of water droplets near an interface of oil and a solution containing HAuCl4 at a high temperature is successfully proved. According to the method disclosed by the invention, hydration electrons released in a conversion process from OH <-> to OH < * > in the water droplets are extracted, the hydration electrons and H2O2 formed in the droplets have a synergistic effect, Au3 < + > is promoted to be reduced to form natural gold atoms, the atoms are gathered into nano-scale and micron-scale gold particles in a droplet coalescence process, and a clear and reasonable mechanism is provided for formation of elemental gold in crude oil extraction hydrothermal fluid.

The invention relates to the technical field of catalysts, and discloses a gold-loaded alkane dehydrogenation catalyst and a preparation method and application thereof.The core of the catalyst is a ZMQ-1 molecular sieve, gold nanoparticles are evenly loaded on the titanium-doped ZMQ-1 molecular sieve, and a nano carbon material serves as an auxiliary material to optimize the stability and dispersity of the catalyst; the preparation method comprises the following steps: synthesizing a titanium-doped ZMQ-1 molecular sieve, preparing a functionalized carbon nanomaterial, loading gold particles and finally roasting the catalyst. In an alkane dehydrogenation reaction, the catalyst shows relatively high alkane conversion rate and olefin selectivity, and can maintain relatively good stability in multiple cycles. Compared with the prior art, the catalyst disclosed by the invention has excellent catalytic efficiency and long-term effect under a high-temperature condition, and is suitable for industrial application of alkane dehydrogenation reaction.

The invention provides a positive electrode particle and a preparation method thereof, a positive electrode plate, a sodium battery and an energy storage device. The positive electrode particles comprise ferric sodium phosphate pyrophosphate particles and a carbon coating layer, the carbon coating layer wraps the surfaces of the ferric sodium phosphate pyrophosphate particles, the positive electrode particles comprise gray particles and golden particles, and in the positive electrode particles, the number ratio Z of the gray particles is larger than or equal to 0.8 and smaller than or equal to 1.

The invention relates to a photothermal conversion material and application thereof, and belongs to the technical field of laser ignition. The photothermal conversion material comprises a composite material formed by loading gold particles on titanium carbide nanosheets and fluorinated alkyl bonded on the surface of the composite material. Gold particles are loaded on the titanium carbide nanosheets, the photothermal conversion performance of the titanium carbide nanosheets can be enhanced on the physical level, meanwhile, fluorinated alkyl silane is adopted for modifying the composite material, the photothermal conversion material can generate CFx free radicals under laser irradiation, oxygenolysis of the titanium carbide nanosheets is accelerated through a chemical reaction, and the photothermal conversion performance of the titanium carbide nanosheets is improved. A TiO2 hardened layer generated by the titanium carbide nanosheet under laser irradiation is broken through, the titanium carbide nanosheet is completely oxidized, energy release of the titanium carbide nanosheet is improved to the maximum extent, high-temperature pulses are instantly generated, and when the titanium carbide nanosheet is used for laser ignition, combustion of energetic materials can be rapidly triggered under low laser energy irradiation.

The invention discloses a one-step biosensor, and aims to solve the problems that a traditional detection device is tedious in steps and needs multiple operations to complete the detection process. The device mainly comprises a substrate layer and a channel layer, liquid with same or different specific biomolecules flows through multiple groups of gold particles through multiple groups of specific pipelines, so that the specific biomolecules are hung on the gold particles, whole blood in the channel layer is separated into plasma and blood cells through electrodes on the substrate layer, and after the plasma and a buffer solution are fully mixed, the blood cells in the channel layer are separated. The method comprises the following steps: enabling the plasma to flow through gold particles decorated by specific biomolecules, and combining target molecules in the plasma with the specific biomolecules to realize red shift and color change of SPR peaks, so that the same or different target molecules are identified, and the content of the target molecules is judged.

The invention relates to the technical field of semiconductors, in particular to a gallium oxide nanowire / porous gallium nitride heterojunction and a preparation method and application thereof. The method comprises the following steps: sequentially growing a GaN buffer layer, a u-GaN layer and a p-GaN layer on a substrate to obtain a base; in mixed gas of hydrogen and inert gas, performing thermal decomposition on the substrate to obtain porous gallium nitride; heating the porous gallium nitride in mixed gas of oxygen and inert gas to obtain a gallium oxide / porous gallium nitride heterojunction; spraying gold on the surface of the gallium oxide / porous gallium nitride heterojunction, and annealing the gold into gold particles in an inert atmosphere; in mixed gas of oxygen and inert gas, a gallium source is arranged beside the gallium oxide layer in the previous step for heating, and the gallium oxide nanowire / porous gallium nitride heterojunction is obtained. The prepared heterojunction has excellent carrier transport characteristics, light absorption efficiency and charge separation capability, and is suitable for the fields of solar-blind ultraviolet photoelectric detection, photocatalysis, high-sensitivity sensors, high-power electronic devices and the like.

The invention discloses a high-thickness-diameter-ratio ultrathin gold nanosheet and a synthesis method thereof, and belongs to the technical field of micro-nano materials. According to the invention, a phytic acid reagent aqueous solution and a humic acid reagent aqueous solution are added into a chloroauric acid aqueous solution, wherein the phytic acid reagent and the humic acid reagent play roles of a reducing agent and a protective agent. Nucleation and growth of the ultrathin gold nanosheet with the high thickness-diameter ratio are achieved by regulating and controlling the reaction temperature, the pH value of the chloroauric acid water solution, the concentration of the phytic acid reagent water solution, the concentration of the humic acid reagent water solution and the like. The diameter of the synthesized ultrathin gold nanosheet with the high thickness-diameter ratio is 10-50 microns, the thickness of the nanosheet is 5-10 nm, and the slicing rate is larger than 90%; wherein a small amount of spherical gold particles exist, and the particle size of the spherical gold particles is 0.1-0.5 mu m. According to the method, phytic acid and humic acid biomass reagents are used for synthesizing the ultrathin gold nanosheets with the high thickness-diameter ratio, pollution of toxic reducing agents or surfactants to the environment is reduced, multi-valued utilization of the phytic acid and humic acid biomass reagents is effectively improved, the whole process is simple and easy to operate, large-scale production can be achieved, and the method is suitable for industrial production. The material is expected to be applied to the fields of catalysis and high-reliability electronic devices.

The present invention belongs to the field of immunochromatographic detection technology, and specifically relates to a colorimetric immunochromatographic detection probe, a test strip, a detection method and an application. The detection probe is a magnetic mesoporous metal nanomaterial probe, which includes a magnetic material, a mesoporous silicon material, a dopamine hydrochloride flexible support material and precious metal nanoparticles. The mesoporous silicon material is located between the core of the magnetic material and the dopamine hydrochloride flexible support material, and the precious metal nanoparticles are adsorbed on the surface and pores of the mesoporous silicon material. The surface of the dopamine hydrochloride flexible support and the precious metal nanoparticles is enriched with detection antibodies. The precious metal nanoparticles coated on the colorimetric immunochromatographic detection probe of the present invention can quickly trigger the gold plasma surface resonance effect, so that Au 3+ The reduced gold particles are deposited on the chromatographic test strip, thereby enhancing the colorimetric intensity. Notably, adjusting the pH of the hydroxylamine solution effectively reduces false-positive interference caused by self-nucleation. Therefore, this immunoassay method enables rapid, ultrasensitive, and visual detection of biomarkers.

This invention discloses a functionalized biomodified electrode for rapid pathogen detection and its preparation method, relating to the fields of biosensing and electrochemical detection technology. It includes a glassy carbon electrode substrate, the surface of which is sequentially modified with a reduced graphene oxide layer, an electropolymerized polydopamine film, and an electrodeposited gold nanoparticle layer, forming a composite nanomaterial modified electrode. Antibodies are captured and fixed to the electrode surface through covalent interactions. This functionalized biomodified electrode for rapid pathogen detection and its preparation method, using the same electrochemical workstation, first electropolymerizes dopamine to form a film and then electrodeposits gold nanoparticles. This allows for precise control of film thickness, gold particle size, and coverage density by parameters such as polymerization potential, scan cycles, deposition potential, and deposition time. This avoids batch-to-batch fluctuations caused by dissolved oxygen and solution disturbances in traditional chemical methods, reducing the relative standard deviation of peak current detection from different batches of electrodes from 18.7% to 4.2%–4.5%.

The present application belongs to the technical field of toxin detection, and particularly relates to a method for detecting shellfish toxin based on transition metal oxide / gold particle composite SERS substrate; paralytic shellfish poison, i.e. saxitoxin, in the shellfish toxin is selected as a detection object; the specific steps are as follows: firstly, a zinc oxide-silver composite nanoparticle SERS substrate is prepared to enhance the Raman signal of saxitoxin; then, SERS spectra of saxitoxin with different concentrations are collected; the collected spectra are introduced into matlab to establish a prediction model by using a PLS algorithm; an actual sample is treated according to a national standard method to obtain a treatment liquid; then, the SERS spectrum of the treatment liquid is collected and introduced into the prediction model to obtain a prediction result; the present application has the advantages of simple synthesis steps, good SERS enhancement effect, fast detection speed, high stability, and good application prospect in the technical field of harmful factor detection in food and the like.

The invention belongs to the technical field of harmful microorganism detection, and particularly provides an electrochemical sensor for detecting escherichia coli (escherichia coli O157: H7) in food and a preparation method of the electrochemical sensor. According to the electrochemical sensor, the surface of a substrate electrode is sequentially modified with an electron transduction layer and a recognition molecular layer; wherein the electron transduction layer is formed by an infinite coordination polymer composite material of gold nanoparticles; the recognition molecular layer is a nucleic acid aptamer. The electrochemical sensor is high in sensitivity, good in selectivity and low in detection limit; compared with other detection methods, the method does not need incubation and can be directly used for in-situ and rapid detection of bacteria.

The application discloses a kind of electron microscope colloidal gold label aggregation degree quantitative analysis method, including obtaining transmission electron microscope colloidal gold label picture, then the electron microscope colloidal gold label picture is pretreated, for the picture after pretreatment parameter-dependent semi-automatic division gold particle and manually selected region of interest, then the area density of real gold particle in region of interest is calculated, the aggregation degree of gold particle is calculated using average nearest neighbor analysis method to electron microscope colloidal gold in the range of 60-140 area density, finally identify ANNA numerical value between 0.6-1.4 electron microscope colloidal gold is labeled as qualified positive marker data.The application selects suitable gold particle positive marker data by the calculation of gold particle area density and aggregation degree, eliminates the interference of false positive to ANNA quantitative analysis, so that average nearest neighbor analysis method can be suitable for electron microscope colloidal gold label scene quantitative analysis.

The catalyst for the oxidative esterification of methacrolein to methyl methacrylate comprises a support having an average diameter of at least 0.8 mm. The support is selected from oxides of silicon, carbides of silicon, metal oxides, and metal carbides. The catalyst further comprises nickel oxide and gold particles disposed on the support. The gold particles have an average diameter of less than 12 nm and a standard deviation of + / - 4 nm. A process for preparing methyl methacrylate from methacrolein and methanol using the catalyst is also disclosed.

The utility model provides a gold separating device with a water vapor extraction device, which comprises a bearing device, a heating device and a water vapor extraction device, and is characterized in that the bearing device is used for bearing gold particles; the upper end face of the heating device is provided with a containing groove used for containing the bearing device and used for heating the bearing device arranged in the containing groove. The water vapor extraction device is arranged on the heating device, and when the bearing device is arranged in the containing groove, the extraction end of the water vapor extraction device extends into the bearing device so as to extract water vapor in the bearing device. In the process that the heating device heats the gold particles in the bearing device, the water vapor in the bearing device is continuously extracted through the water vapor extraction device, and then the humidity in the bearing device is reduced, so that the technical effect of improving the gold particle drying efficiency is achieved; meanwhile, in the process that the water vapor extraction device continuously extracts the water vapor in the bearing device, the water vapor extraction device can accelerate flowing of air in the bearing device, and then the gold particle drying efficiency is further improved.

The invention belongs to the technical field of lubricating materials, and particularly relates to a modified WS2 membrane material and a preparation method and application thereof. The modified WS2 membrane material provided by the invention comprises a matrix and a membrane layer coating the surface of the matrix, wherein the membrane layer comprises a WS2 membrane and gold particles doped in the WS2 membrane. In the invention, Au as a soft metal has excellent chemical stability and good lubricating property in a space environment, and the Au element exists in the MoS2 thin film in a nano-particle form, so that the effects of increasing the compactness of the thin film and improving the mechanical property are achieved. The Au-doped MoS2 film grows in a base plane preferred orientation manner, so that the friction coefficient is reduced, the wear-resistant life is prolonged, and the tribological performance of the film is greatly improved. The Au element is introduced into the WS2 thin film with better oxidation resistance through a magnetron sputtering method, and the thin film is endowed with better mechanical and tribological properties.

The invention discloses a method for green synthesis of gold micron sheets by using xylan in cooperation with chloroauric acid, and belongs to the technical field of micro-nano materials. A green and environment-friendly biomass reagent xylan is used for synthesizing the gold micron sheet in a water phase system, and the specific preparation method comprises the steps that a polyvinylpyrrolidone solution is added into a chloroauric acid solution, xylan is added to serve as a reducing agent and a protective agent, and the gold micron sheet is obtained; effective nucleation and growth of the gold micron sheet are achieved by regulating and controlling the reaction temperature, the reactant mass concentration and the pH value of the gold precursor solution. The synthesized gold micron sheet is hexagonal, triangular and truncated triangular, the diameter is 1-6 microns, the sheet thickness is 100-150 nm, the sheet rate is higher than 80%, and the particle size of a small number of spheroidic gold particles is 0.1-1 micron. According to the method, the biomass reagent xylan is used, pollution of traditional chemical reagents to the environment is relieved, operation is easy and convenient, large-scale production is easy, the size and shape of the gold micron sheet are controllable, and an efficient method is provided for green synthesis of the gold micron sheet.

The invention discloses a technology for improving the leaching rate of micro-fine particle wrapped gold based on microwave and oxidizing agent combined pretreatment, and belongs to the technical field of gold extraction metallurgy. The process comprises the steps of ore pulp pretreatment, concentration and pulp mixing, composite oxidizing agent adding, microwave pretreatment, cyanidation leaching and the like. According to the method, the microwaves and the composite oxidizing agent are utilized, a microfine particle gold wrapping carrier is efficiently destroyed, the leaching rate of gold is increased to 85-92% from 45-55% of a traditional method, meanwhile, energy consumption is reduced by 40% or above, sulfur dioxide emission is avoided, and the method has the advantages of being efficient, low in consumption, environmentally friendly and the like and is particularly suitable for extraction of arsenic-containing, sulfur-containing, carbon-containing and other microfine particle wrapping type refractory gold ores.

The application discloses a small-molecule multi-connection detection kit based on a biochip, a preparation method and a detection method thereof. The kit comprises nano-gold particle labeled antibodies, a multi-connection detection chip plate and a detection buffer. The nano-gold particle labeled antibodies comprise nano-gold particle labeled florfenicol antibodies and enrofloxacin antibodies. The multi-connection detection chip plate is coated with florfenicol antigens and enrofloxacin antigens in detection holes. The detection buffer is composed of 10-40 mM phosphate buffer and 0.05-0.5 wt% surfactant S17. The application can simultaneously detect florfenicol and enrofloxacin small molecules by using one detection buffer, thereby saving time and labor.

Provided is an immunochromatographic method with high detection sensitivity. An immunochromatographic method includes: a mixing step of obtaining a mixture containing a magnetic particle complex by mixing a sample that can contain an antigen and a magnetic particle modified with a substance having specific affinity for the antigen; a capturing step of capturing the magnetic particle; a dissociation step of obtaining an antigen concentrate by mixing the captured magnetic particle and a dissociation solution in an amount smaller than the sample that can contain the antigen, and dissociating the modified magnetic particle; a neutralization step of obtaining a neutralized antigen concentrate; a development step of developing on an insoluble carrier having a reaction site on which a second binding substance is immobilized, in a state in which a gold particle complex is formed as a complex of the antigen in the neutralized antigen concentrate and a gold particle modified with a first binding substance; a capturing step of capturing the gold particle complex on the reaction site; and a silver amplification step of performing silver amplification on the gold particle complex.

The invention discloses a gold-based nano-catalyst as well as a preparation method and application thereof, and belongs to the technical field of co-production hydrogen production through biomass electrochemical conversion. According to the preparation method disclosed by the invention, a gold precursor, an iron precursor, a surfactant and a reducing solvent are combined with a carbon carrier solution to serve as a preparation raw material, Au-FeOx heterojunction nano-particles are formed through metal oxide modified nano-gold particles, and then the Au-FeOx heterojunction nano-particles are loaded on the surface of the carrier to form the catalyst. The gold-based nano-catalyst prepared by the method is high in glycerol adsorption capacity and reaction intermediate adsorption and dissociation capacity, and good in catalytic activity.

The invention discloses a zinc oxide nano sound-sensitive agent as well as a preparation method and application thereof, and belongs to the technical field of sound-sensitive agents. The zinc oxide nano sound-sensitive agent prepared by the invention comprises composite zinc oxide and a mesoporous silicon dioxide layer with glutathione responsiveness from inside to outside; the mesoporous silica layer with glutathione responsiveness is subjected to hydrothermal treatment after being aminated and is modified with hyaluronic acid; the composite zinc oxide is obtained by depositing nano gold particles on the surface of zinc oxide after carbon doping; the zinc oxide nano sonosensitizer prepared by the method is relatively good in biological safety, has better sonodynamic activity and can efficiently generate active oxygen.

The application relates to a kidney-excretable nano-gold aggregate, a preparation method and application as a CT contrast agent, and comprises the following steps: mixing chloroauric acid solution, lye and a mercapto hydrophilic compound to obtain mixed solution A; under the condition of ice water bath and stirring, a reducing agent is added into the mixed solution A to obtain mixed solution B containing nano-gold particles; the mixed solution B is mixed with a wrapping material-buffer solution to obtain mixed solution C containing nano-gold particles@wrapping material; a positively charged compound solution is added into the mixed solution C to obtain mixed solution D; the nano-gold is made into a stable aggregate by the positively charged compound; and the mixed solution D is centrifuged to obtain the kidney-excretable nano-gold aggregate. The synthesized super-small nano-gold is agglomerated into a nano-gold aggregate with stable structure, and the contrast agent can be obtained by simple centrifugal concentration, the contrast agent is stable in property, has good biocompatibility, and can be discharged out of the body along with urine within a period of time after entering the body.

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 method for broadening the surface enhanced Raman molecule library based on the use of gold@silver@silicon oxide and gold@silicon oxide core-shell structures. The present invention belongs to the field of inorganic nanocomposite materials. Raman tags can be prepared using the following methods: (1) inducing aggregation of gold particles incubated with Raman active molecules; (2) coating an Ag layer on the product of (1) to further enhance the stability of the Raman tag; (3) coating a silicon oxide layer on the product of (2). A three-step enhancement strategy is used to expand the library to 6 types of molecules (nitrogen heterocycles, dyes, thiophenes, sulfides, alkynyls, and thiol molecules), totaling 26 Raman active molecules.

The present invention belongs to the field of micro-nano optical materials technology, specifically relating to a hexagonal, non-close-packed gold nanoparticle array based on a microscopically complex surface and a method for preparing the same. The preparation method is primarily based on a colloidal crystal template calcination method and comprises: filling the microscopically complex surface with UV-curable adhesive and curing it; assembling a monolayer of polystyrene microspheres using a gas-liquid interface self-assembly method and transferring them to a target surface; and sputtering a monolayer of elemental gold and calcining it to produce a hexagonal, non-close-packed gold nanoparticle array with a well-symmetric microscopically complex surface. The non-close-packed gold nanoparticle array prepared by the present invention not only exhibits good periodicity and substrate conformability, but also has an additional step compared to the traditional colloidal crystal template calcination method, resulting in simpler operation.

The invention provides a laboratory column leaching method, and belongs to the technical field of hydrometallurgy. According to the method, interference of fine-grained materials and coarse-grained gold on leaching is effectively eliminated through rigorous particle size separation and pretreatment steps, and the effect that the fine-grained materials are stacked and covered on the surface of deep leached ore along with a leaching agent in the simulated dump leaching process and the pressure borne by the deep ore are combined, so that the leaching efficiency of the deep leached ore is improved. The physical and chemical conditions of the deep ore in the dump leaching process are further simulated, the industrial dump leaching conditions are more truly reduced, the actual leaching rate of elements to be recycled in the ore in the actual dump leaching process is accurately evaluated, production is guided, and scientific data support is provided.

The application relates to a preparation method of modified micron gold dispersion liquid and conductive gold paste. Gold powder is prepared by an in-situ synthesis method, the gold powder is modified by CTAB, the gold is directly transferred into an organic solution by utilizing the different surface tension of the gold particles after surface modification in different solutions, the gold can be directly configured into a slurry, the gold powder can be uniformly dispersed in the slurry without needing to be precipitated, dried and re-dispersed, the problems of uneven dispersion of the gold powder and unstable performance after sintering caused by the precipitation and dispersion in the traditional process are avoided, meanwhile, the yield of the gold powder is higher, and new impurities are avoided in the drying step.

The application relates to the field of gas sensors, and particularly discloses an electrochemical acetylene sensor electrode, a preparation method thereof and an electrochemical acetylene sensor. The electrochemical acetylene sensor electrode comprises a polytetrafluoroethylene film and a slurry coated on the polytetrafluoroethylene film, wherein the slurry comprises nano gold particles, nano magnesium oxide, nano barium oxide, modified conductive carbon powder and a Nafion solution in a weight ratio of (0.47-0.50):(0.02-0.20):(0.02-0.18):(1-3):(0.6-2.0); and the modified conductive carbon powder is obtained by mixing potassium permanganate, deionized water and conductive carbon and then performing ball milling. The application realizes the effects of high sensitivity and high linearity of acetylene gas, greatly improves the selectivity of the electrochemical acetylene sensor, and has the advantages of low detection limit, high sensitivity and good selectivity.