220 results about "Gold particles" patented technology

The present invention relates to a timepiece component or jewellery component made entirely or partially from a material comprising between 9 and 21 carats of gold, the material (1) comprising a predefined colour matrix (2) defined by its a*, b*, and L* coordinates in the CIE L*a*b* space, and having a density less than or equal to 10 g / cm3, preferably less than or equal to 8 g / cm3, and at least gold particles (3) dispersed in the matrix. According to the invention, the dimensions of the gold particles (3) are such that the maximum dimension of the gold particles (3) in the plane of the surface of the observed material is less than 60 μm, preferably less than 30 μm, and the minimum dimension of the gold particles (3) in the plane of the surface of the observed material is greater than 1 nm, preferably greater than 10 nm, preferably greater than 200 nm, preferably greater than 0.5 μm, and more preferably greater than 1 μm, the gold particles (3) having no plasmonic effect and being dispersed homogeneously in the matrix (2), and the quantity of gold particles (3) dispersed in the matrix (2) is predetermined such that the material (1) appears to have a colour identical or close to the predefined colour of the matrix (2) to the same observer placed at least 30 cm, and preferably at least 10 cm, from the surface of the material (1), under the same conditions of illumination by an illuminant, the colour of the material being such that the colour difference ΔE* in the CIE L*a*b* colour space between the colour of the material and the colour of the matrix is less than 10, preferably less than or equal to 5, preferably less than or equal to 4, and more preferably less than or equal to 3. The present invention also relates to a method for manufacturing a timepiece component or jewellery component as defined above.

The invention provides liquid metal and application thereof, a cathode material and a micro cathode arc thruster, and belongs to the technical field of alloy materials. The liquid metal provided by the invention comprises a liquid gallium alloy and metal particles, the mass ratio of the liquid gallium alloy to the metal particles is (3.78-4.62): (0.3-6); the metal particles comprise one or more of titanium particles, silver particles, gold particles, copper particles and aluminum particles. The surface tension of the liquid gallium alloy is reduced and the viscosity of the liquid gallium alloy is improved by adopting the metal particles, the metal particles can overcome slight vibration, are adsorbed on the surface of the metal feeding pipe and do not flow willfully, the metal particles serve as a cathode working medium of the micro-cathode arc thruster, stable work can be achieved, and the service life of the thruster is prolonged.

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 provides a preparation method and application of a gold-loaded tin dioxide catalyst, the gold-loaded tin dioxide catalyst can be used for catalyzing methane oxidation to prepare methanol, the preparation method comprises the following steps: dissolving a tin source and a gold source in water to obtain a mixed solution; drying the mixed solution, and grinding into powder; and carrying out high-temperature calcination treatment on the powder under the protection of a vacuum inert atmosphere to obtain the gold-loaded tin dioxide catalyst, which is a gold / tin dioxide catalyst and comprises a tin dioxide carrier and gold nanoparticles loaded on the carrier. In the prepared gold / tin dioxide catalyst, a gold-tin alloy layer is formed on the surfaces of gold particles loaded on tin dioxide, and under the action of water, carbon monoxide assists oxygen activation to generate hydroxyl radicals, so that oxygen-containing compounds can be prepared by efficiently oxidizing methane, and the methanol production rate and selectivity in methane oxidation reaction are improved.

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 provides a preparation method of a pump-free SERS (Surface Enhanced Raman Scattering) micro-fluidic chip for detecting mi RNA (Ribonucleic Acid) related to liver cancer and the pump-free SERS micro-fluidic chip. The method comprises the following steps: 1) preparing 20nm gold particles (AuNPs) by adopting a sodium citrate reduction method; 2) respectively modifying Raman signal molecules DTNB and 4-MBA and nucleic acid complementary chains H1 and H2 on AuNPs to prepare AuNPs (at) DTNB (at) H1 and AuNPs (at) 4-MBA (at) H2; (3) modifying the surface of the magnetic core Fe3O4 with nucleic acid aptamers cDNA (complementary deoxyribonucleic acid) 1 and cDNA 2 of the mi R-21 and the mi R-155 to obtain Fe3O4 (at) cDNA 1 and Fe3O4 (at) cDNA 2 (Fe3O4 (at) cDNA); (4) the AuNPs (at) DTNB (at) H1 and the AuNPs (at) 4-MBA (at) H2 prepared in the step (2) are coupled with the Fe3O4 (at) cDNA prepared in the step (3), and Fe3O4 (at) cDNA-AuNPs (at) Raman report (at) H is obtained; and 5) mixing polydimethylsiloxane (PDMS) with a curing agent, adding the mixture into the template to prepare a micro-fluidic chip, and carrying out hydrophilic treatment to construct the pump-free SERS micro-fluidic chip. The method has the advantages of high sensitivity, high specificity, high detection speed and the like.

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.

To provide a catalyst having high catalytic activity and a method for producing the same.SOLUTION: A catalyst has gold fine particles carried on a porous glass carrier containing SiO2 and ZrO2.SELECTED DRAWING: None

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 relates to a nanogold aggregate capable of realizing kidney excretion, a preparation method and application of the nanogold aggregate as a CT contrast agent, and the preparation method comprises the following steps: mixing a chloroauric acid solution, an alkali solution and a sulfydryl hydrophilic compound to obtain a mixed solution A; under the ice-water bath and stirring conditions, a reducing agent is added into the mixed solution A, and a mixed solution B containing nano-gold particles is obtained; mixing the mixed solution B with a wrapping material-buffer solution to obtain a mixed solution C containing the gold nanoparticles and the wrapping material; adding a positively charged compound solution into the mixed solution C to obtain a mixed solution D; the nanogold becomes a stable aggregate through a positively charged compound; and centrifuging the mixed solution D to obtain the nanogold aggregate capable of realizing kidney excretion. The synthesized ultra-small nanogold is agglomerated into the nanogold aggregate with a stable structure, the contrast agent can be obtained through simple centrifugal concentration, the contrast agent is stable in property and good in biocompatibility, and the contrast agent can be discharged out of a body along with urine within a period of time after entering the body.

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 invention provides a biological immunodetection method based on an LEDs light-emitting chip, and solves the technical problems of high instrument cost, relatively tedious operation steps and low sensitivity in the existing immunodetection technology. The method comprises the following steps: preparing an LED light-emitting chip substrate modified by a characteristic antibody and gold nanoparticles modified by the characteristic antibody, and dropwise adding a biomarker to be detected and the gold nanoparticles on the LED light-emitting chip substrate to form a double-antibody sandwich structure. The gold particles adsorbed on the substrate of the LEDs light-emitting chip are used as resonant nano antennas, surface plasmon transmitted on the light-emitting chip is converted into a local surface plasmon mode, the local surface plasmon mode is effectively and outwards coupled and radiated to a far field, and a bright point is presented at the adsorbed gold nano particles, so that the light-emitting effect of the LED light-emitting chip is greatly improved, and the service life of the LED light-emitting chip is prolonged. And calculating the number of the gold nanoparticles under a microscope to obtain a detection result. The method can be used for quantitative detection of biomarkers, and is convenient for detection, low in cost, good in visibility and high in detection sensitivity.

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.

A system (10) for determining the validity of the results of a lateral flow test, the system comprising a lateral flow stick (180a, 180b, 180c). The lateral flow stick (180a, 180b, 180c) comprises: a sample pad (310); a conjugate pad (315) comprising antibody-treated gold particles; and a porous membrane (320) for receiving a capillary flow of a milk sample. The porous membrane (320) comprises: a test line (360) treated with a progesterone reference, the progesterone reference binding to the antibody-treated gold particles of the milk sample and thereby causing the test line (360) to change color when exposed to milk having a progesterone level below a threshold limit; and a control line (370) treated with an antibody reference binding to an antibody and thereby causing the control line (370) to change color when exposed to milk comprising antibody-treated gold particles. The system also includes a sensor (210) and a control unit (150), the control unit being configured to: obtain a reference hue (380) of the control line (370); determine a current hue of the control line (370) based on an image captured by the sensor (210) during the ongoing lateral flow test; compare the reference hue (380) of the control line (370) with the current hue of the control line (370); and indicate the validity of the lateral flow test performed on the lateral flow stick (180a, 180b, 180c) based on the comparison performed.

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 invention relates to the technical field of metal powder preparation, in particular to high-tap-density and high-crystallinity gold powder and a preparation method thereof. The preparation method comprises the following steps: preparing a seed crystal solution, preparing a gold salt solution from chloroauric acid and a complexing agent, preparing a mixed solution of a reducing agent and a dispersing agent, and dropwise adding the gold salt solution and the reducing agent solution into the seed crystal solution at a certain rate, so that the seed crystal gradually grows into micron-sized particles. According to the method, small-size gold particles serve as seed crystals, the nucleation process and the growth process in a liquid phase method can be separated, and the prepared gold particles are uniform in particle size; meanwhile, the complexing agent and the dispersing agent are added, the reaction rate in the growth process can be reduced, and the crystallinity of the gold particles is improved. The preparation method is simple and convenient, the grain size of the gold powder is controllable, the tap density of the prepared gold powder is larger than or equal to 9.0 g / cm < 3 >, the crystallinity is high, the grain size distribution is narrow, the dispersity is good, and the requirement of the gold powder for high-performance electronic paste can be met.

The object of the present invention is to provide a CoMnSi-based magnetostrictive composite material and a preparation method thereof, which specifically comprises the following steps: 1) preparing 30-300 micron CoMnSi-based alloy particles; 2) uniformly mixing the CoMnSi-based alloy particles with epoxy resin and placing them in a mold; 3) removing bubbles in the mixture using a vacuum pump; 4) orienting and curing the mold containing the mixture on a rotating table in a uniform magnetic field; 5) removing the CoMnSi-based and gold particle / epoxy resin composite material from the mold. The CoMnSi-based alloy molecular formula of the present invention is Co 1‑x Ni x MnSi (0.01≤x≤0.12), the epoxy resin includes epoxy resins such as E51 and E44 and a curing agent. This invention has been funded by the National Key R&D Program of "Frontier Research on Large Scientific Facilities" (2022YFA1602700).

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.