16 results about "Gold salts" patented technology

The invention relates to the technical field of electroplating, and particularly discloses a cyanide-free gold electroplating solution as well as a preparation method and application thereof. The cyanide-free electrogilding plating solution comprises soluble gold salt, a first complexing agent, a second complexing agent, a buffering agent, a brightening agent, a wetting agent, a titanium ion chelating agent, an antioxidant, conducting salt and the balance deionized water. The first complexing agent is ethylene diamine tetraacetic acid disodium salt; the preparation raw materials of the second complexing agent comprise an aza-macrocyclic complex and sodium hydroxide, and the mass ratio of the aza-macrocyclic complex to the sodium hydroxide is 1: (1-2). The stability of the plating solution can be improved, and a plating layer with fine crystal nucleus and a compact structure can be formed, so that the protection performance and the appearance of the plating layer are improved.

The invention discloses preparation and application of a gold cluster compound for targeted therapy of acute kidney injury diseases, and relates to the field of nephropathy treatment medicines. The molecular composition (Au) is x (S) y, x is equal to 3-144, y is equal to 1-140, and S is a sulfydryl-containing renal injury target protein binding peptide or a sulfydryl-modified renal injury target protein binding peptide. The method comprises the following steps: mixing a gold salt solution with a sulfydryl-containing ligand to form a mixed solution; under the conditions of certain temperature and pH, the mixed solution system is subjected to a reduction reaction, high-valence Au ions in the gold salt are reduced into Au atoms or monovalent Au ions, and Au forms a gold cluster compound through physical or chemical interaction; the cluster compound disclosed by the invention has remarkable treatment activity in a cis-platinum induced acute kidney injury model, and the acute kidney injury is treated in a targeted manner by inhibiting over transcription and expression of pro-inflammatory cytokines and removing reactive oxygen species (ROS).

The invention relates to the technical field of surface treatment, and discloses a gold plating solution, a preparation method thereof and an electroplating process. According to the total volume of the gold plating solution, the gold plating solution comprises the following components by concentration: 1-20 g / L of gold salt; 100 to 230 g / L of citrate; 20 to 50g / L of oxalate; 0.5-5 g / L of a transition metal additive; 4-10 g / L of an antioxidant; 1-5 g / L of a surfactant; wherein the pH value of the gold plating solution is 4-4.8, and the specific gravity of the gold plating solution is 10-15; the citrate comprises potassium citrate and citric acid; the transition metal additive is selected from at least one of cobalt salt, nickel salt and ferric salt. The preparation method is simple, and the prepared gold plating solution is used for the steps of base material pretreatment, electroplating treatment and aftertreatment in the electroplating process, so that the prepared gold plating product has excellent binding force, wear resistance, corrosion resistance and the like.

A process for preparing a catalyst for the oxidative esterification of methacrolein to methyl methacrylate includes providing a support selected from an oxide of silicon, a carbide of silicon, a metal oxide, and a metal carbide. Particles of at least one oxide of a metal are provided on the support. The support is contacted with a gold salt and heated at a temperature ranging from 50°C to 600°C for a time ranging from at least 0.1 hours to 48 hours to convert the gold salt into gold nanoparticles having an average diameter of less than 12 nm and a standard deviation of + / - 4 nm, with at least 75% by number of the gold nanoparticles located within 20 nm of the metal oxide particle.

This invention discloses a composite stabilizer for stabilizing volatile heavy metals in the digestion of excess activated sludge and its application method, belonging to the field of environmental monitoring and chemical analysis technology. Addressing the problem that excess sludge from metallurgical wastewater treatment is complex in composition and subject to severe interference, especially the easy loss of volatile elements such as mercury, arsenic, selenium, and antimony during traditional digestion and pretreatment processes, leading to low detection results, this invention provides a solution for stabilizing volatile heavy metals in the digestion of excess activated sludge, enabling accurate detection of these elements. The composite stabilizer efficiently complexes and stabilizes multiple volatile heavy metal elements, overcoming the problems of narrow stability range and high cost associated with single stabilizers (such as gold salts). The combination of L-cysteine ​​and trace amounts of gold salt reduces costs and improves stabilization effect. The use of a low-concentration nitric acid medium avoids interference from chloride ions in hydrochloric acid on arsenic, facilitating accurate detection by mass spectrometry.

The invention relates to a cyanide-free chemical displacement gold plating solution and a gold plating method, which are particularly suitable for deposition of an ultrathin gold layer (less than or equal to 0.1 mu m) on the surface of a nickel base material. The gold plating solution comprises a buffering agent, gold salt and a double-complexing-agent system composed of L-glutamine and 2-furancarboxylic acid. Amido and amino of L-glutamine synergistically act on the surface of nickel, so that mild activation is realized; furan epoxy atoms in 2-furancarboxylic acid and carboxyl form a steric-hindrance effect, so that gold ion release kinetics is regulated and controlled, and excessive substitution reaction is inhibited. The two synergistically solve the problems of unstable gold plating liquid, uneven coverage and the like in replacement gold plating on the nickel layer, and the obtained gold layer is compact and non-porous, and the gold plating liquid is stable. The process is environment-friendly and is suitable for high-reliability gold plating of the microelectronic packaging nickel substrate.

The application discloses a kind of for methanol and methyl methacrolein oxidation esterification catalyst and its preparation method and application, belong to catalytic synthesis technical field.The application first prepares silicon-titanium molecular sieve TS-1 carrier, then loads gold nanoparticles, and gold-based catalyst is prepared, TS-1 carrier can not only stabilize gold salt, Ti-O-Au bond can be formed between titanium species in TS-1 carrier and gold nanoparticles, improve the interaction between gold metal and carrier, more effectively limit the size of gold particle, form smaller size nano gold particle and good dispersity, improve the specific surface area of catalyst, to improve catalyst activity and stability.Mass concentration is 45-80% methanol and methyl methacrolein mixed solution and the obtained catalyst are mixed sufficiently, oxygen is input, and oxidation esterification reaction occurs under 70-160 DEG C, 0.5-2MPa, to prepare methyl methacrylate.The gold-based catalyst prepared by the application significantly improves the conversion rate of methyl methacrolein and the selectivity of methyl methacrylate.

The utility model provides a kind of gold salt recovery pollution prevention and control device, comprising: rack, lifting frame, gas injection module, PCB workpiece and gold sink tank;The lifting frame is located in the inside upper side of the rack, the PCB workpiece is located at the bottom of the lifting frame, the gold sink tank is located directly below the PCB workpiece;The gas injection module is fixedly arranged in the inside of rack by the mounting bracket of its two sides, the gas injection module is located between the lifting frame and PCB workpiece, and is located directly above the PCB workpiece;Further comprising a blower, the blower is located in the outside of the rack, the blower is connected with the gas injection module by air supply hose;The utility model solves the problem of waste and pollution caused by gold water spatter to the outside, and the problem of gold salt concentration control disorder caused by the water of spray.

The invention belongs to the technical field of biology, and relates to a colorimetric probe for detecting myoglobin and a detection method. The colorimetric probe comprises a reagent A and a reagent B: a solution containing iodide ions; the preparation method of the reagent A comprises the following steps: adding a reducing agent into a solution containing a copper salt and a coordination stabilizer, stirring, adding a water-soluble gold salt or gold acid when the solution turns from red to green, and continuously stirring for 1-100 minutes to obtain a copper-gold nanoparticle solution; the thioacetamide is subjected to a hydrolysis reaction in an acid solution to generate hydrogen sulfide, then the copper-gold nanoparticle solution obtained in the step S1 is added for a reaction, and a hydrogen sulfide modified copper-gold nanoparticle solution is obtained. Through a coupling mechanism of acidic H2S in-situ release-Au-S bond binding-I-etching, nanomole-level, high-selectivity and label-free colorimetric detection of myoglobin is realized, and the method has sensitivity, reliability, economical efficiency and field applicability, and can be widely applied to rapid screening.

This invention relates to the preparation of albumin-based gold clusters and their application in the treatment of inflammatory bowel disease (IBD), belonging to the pharmaceutical field. The method uses thiol-containing albumin as a template, mixes it with a trivalent gold salt compound under alkaline conditions, and irradiates it in a microwave reactor at 40–70°C for 1–5 cycles, each cycle lasting 1–10 minutes. This allows for the rapid synthesis of hydrated gold clusters with a particle size less than 20 nm and excellent fluorescence properties without the need for an external reducing agent. This method offers advantages such as rapid reaction speed, high yield, and good batch stability, overcoming the problems of long reaction time, low efficiency, and non-uniform products associated with traditional hydrothermal methods. The obtained albumin-gold clusters exhibit good biocompatibility and targeting properties, effectively accumulating at sites of intestinal inflammation after oral or injectable administration, achieving targeted therapy for IBD and providing a novel drug solution for the clinical treatment of IBD.

The application discloses a method for recovering gold from a leaching solution containing a gold thiothiosulfate salt, comprising the following steps: (1) mixing gold-containing raw materials with a leaching solution, and performing solid-liquid separation after uniform mixing to obtain a leaching solution containing a gold thiothiosulfate salt; (2) mixing polyionic liquid with the leaching solution containing the gold thiothiosulfate salt to obtain a mixed solution, and performing solid-liquid separation after sufficient mixing until the polyionic liquid adsorption is completed, so as to obtain polyionic liquid adsorbed with gold; and (3) immersing the polyionic liquid adsorbed with gold into an acidic thiourea solution, and obtaining soluble gold salt after desorption; the structural formula of the polyionic liquid is shown in the following formula (I)-(IV); and the method disclosed by the application uses a plurality of polyionic liquids with special structures as adsorbents, and realizes efficient separation and recovery of gold from a gold thiothiosulfate salt system. (I); (II); (III); (IV).

The invention relates to a high-stability cyanide-free gold sulfite electroplating solution and an electroplating method, the cyanide-free gold sulfite electroplating solution comprises a main salt, a coordination agent, a conductive salt, a pH buffer agent, a main additive, an auxiliary additive and a solvent, the main salt is a gold sulfite salt, the main additive is a benzenesulfonamide derivative, and the pH value of the electroplating solution is 8.5-10. The cyanide-free gold sulfite electroplating solution with the benzenesulfonamide derivative as the main additive has the advantages that the stability is high, and a prepared plating layer is fine in crystal, uniform and bright, low in internal stress, good in binding force and wide in operation window.

The invention discloses preparation and application of a gold cluster compound of a non-viral targeted in-vivo gene delivery vector, and relates to the field of application of non-viral gene delivery vectors. Au and a specific ligand protamine and Ang-2 peptide have a synergistic effect to form a cluster compound, and the molar ratio of Au to Pro to Ang-2 is 17: 25: (10-40), preferably 17: 25: 34. Mixing the gold salt solution with the ligand to form a mixed solution; under the conditions of certain temperature and pH, the mixed solution system is subjected to a reduction reaction, high-valence Au ions in the gold salt are reduced into Au atoms or monovalent Au ions, and Au forms a gold cluster compound through physical or chemical interaction; the sulfydryl-containing ligand is polypeptide or protein with better biocompatibility, and the cluster compound disclosed by the invention can be used for successfully delivering nucleic acid into cells and has good biocompatibility.

The application relates to the technical field of chemical plating, and particularly discloses a cyanide-free electroplating gold plating solution applied to a wafer and a preparation method thereof. The cyanide-free electroplating gold plating solution comprises a gold salt, a main complexing agent, an auxiliary complexing agent, a crystal grain adjusting agent, an organic phosphonic acid additive, a buffer and deionized water. The crystal grain adjusting agent can adjust the grain size and structure of the plating layer, so that the plating layer is more compact and uniform. The organic phosphonic acid additive can replace the position of a coordination agent which is prone to cause inclusions, effectively controls the interface adsorption of a cathode, is favorable to improving the inclusions in the plating layer, and improves the plating layer quality.

The invention provides a gold plating method for realizing soft gold plating, a composition for gold plating and a plating solution. The gold plating method is carried out by using a plating solution containing a gold sulfite salt and at least one of a thiosulfate ion and a trisulfate ion.

The invention discloses a method for regulating and controlling the morphology of gold nanoparticles through a seed crystal mediation method. The method comprises the following steps that S1, the target adding amount of an additive and a gold salt precursor is determined according to the target morphology of gold nanoparticles, and a corresponding relation exists between the target morphology and the target adding amount; s2, a gold nanoparticle seed crystal, an additive and a gold salt precursor are added into the solution containing the surfactant, a mixed solution is prepared, the additive is an organic small molecule additive serving as a structure-directing agent, and the additive and the gold salt precursor in the gold salt precursor solution are added according to the target addition amount; and S3, a reducing agent is added into the mixed solution for a reaction, after the reaction is finished, separation and purification are conducted, and the gold nanoparticles with the target morphology are prepared. The method has the advantages of being easy and convenient to operate, accurate in control and good in reproducibility, and predictable and repeatable switching of the final morphology of the gold nanoparticles between a twisted polyhedral structure and a multi-dendritic structure can be achieved.