20results about How to "Improve surface reactivity" patented technology

The invention provides a preparation method of calcium-modified ferrihydrite and application of the calcium-modified ferrihydrite in improvement of a soil structure, and belongs to the technical field of soil structure improvement. The preparation method of the modified ferrihydrite comprises the following steps: gradually adding a sodium hydroxide solution into a ferric trichloride solution, and stirring and mixing until the pH value of a suspension reaches neutral; aging the suspension at room temperature for 12 hours, centrifuging to remove supernate, and washing the synthesized ferrihydrite with pure water for 2-3 times; then adding a calcium chloride solution for salt washing for 2-3 times so as to fully replace sodium ions on the surface of ferrihydrite into calcium ions; and washing with pure water for 2-3 times to obtain the calcium modified ferrihydrite. The calcium modified ferrihydrite provided by the invention eliminates the influence of dispersive sodium ions or potassium ions in ferrihydrite synthesized by a traditional method, is a nanoscale weak crystalline mineral, has the effect of rapidly improving the stability of soil aggregates, can rapidly aggregate soil particles after being applied to soil, effectively enhances the structural stability of the soil, and improves the soil quality. Therefore, good materials and means can be provided for soil structure improvement.

The invention relates to the technical field of batteries, in particular to a negative electrode material and a preparation method and application thereof. The negative electrode material comprises a base material and a composite coating layer coated on the surface of the base material, the base material comprises a compound of graphite and hard carbon, the base material has a porous structure, the composite coating layer comprises a first coating layer coated on the surface of the base material and a second coating layer coated on the surface of the first coating layer, the first coating layer includes a carbon material and a conductive agent, and the second coating layer includes a lithium-containing compound. In the negative electrode material provided by the invention, the matrix material comprises the compound of graphite and hard carbon, has abundant porous structures and defects, can increase lithium intercalation channels of lithium ions in particles, and improves the fast charging capability; the composite coating layer can effectively improve defect interface conductivity, reduce overall cross-linking impedance, improve the transmission capacity of Li < + > between carbon layers, promote Li < + > desolvation in SEI and improve the graphite fast charging performance.

The invention provides a preparation method of an anode catalyst layer, the anode catalyst layer and a fuel cell, and belongs to the field of fuel cells. Comprising the following steps: obtaining a WO3 film; activating the WO3 thin film to generate oxygen vacancies in WO3 crystal lattices so as to obtain a p-WO3 thin film; pt nanoparticles are deposited on at least part of the surface of the p-WO3 thin film, and a Pt / p-WO3 thin film is obtained; and dispersing the ionic polymer solution into the Pt / p-WO3 thin film to obtain the Pt / p-WO3 anode catalyst layer. WO3 is used as an anode catalyst carrier, so that the use of a corrosive carbon carrier is avoided, and the problem of easiness in corrosion caused by the carbon carrier is further avoided. Meanwhile, WO3 can generate HxWO3 through a hydrogen overflow effect, and decomposition of HxWO3 can provide additional hydrogen ions and electrons, so that insufficient hydrogen supply of the anode can be avoided, an antipole phenomenon is avoided, serious corrosion of an anode catalyst is avoided, and the durability of an anode catalyst layer is improved.

The invention relates to the technical field of deep-eutectic gel preparation methods, and particularly discloses a method for preparing deep-eutectic gel by quickly initiating deep-eutectic solvent polymerization, which specifically comprises the following steps: step 1, firstly, taking industrial xylan, or cellulose, or glucomannan, or arabinose, or mannan as a raw material, and preparing the deep-eutectic gel by using a one-step method, a one-step method, a one-step method, a one-step method, a one-step method, a one-step method, a one-step method, a one-step method and a one-step method; the preparation method specifically comprises the following steps: respectively adding 20.0 g of industrial xylan into 800mL of deionized water, stirring until the industrial xylan is uniformly dispersed to form a suspension, then weighing 50.0 g of NaIO4, adding the NaIO4 into the suspension, then stirring and reacting for different times at room temperature in a dark place, and after the reaction is finished, filtering, washing and drying to obtain the DAX. Slowly adding 12mL of ethylene glycol into the reaction system to terminate the reaction; the DLPD eutectic gel is prepared by stabilizing LM nano liquid drops by using a dihydroxylan (DAX) solution and rapidly initiating a polymerization reaction of ChCl / AM by using a DAX / LM dispersion liquid in one step, and a free radical initiator and a cross-linking agent are not required to be used in the preparation process.

The invention relates to a high-selectivity ilmenite flotation process, belongs to the technical field of flotation, and aims to solve at least one of the problems of poor ilmenite selectivity, poor collecting performance and the like in the conventional flotation method. According to the ilmenite flotation process, the collecting agent of a specific structure is selected, the two hydroximido groups and the two imino groups are introduced into the same molecular structure, and the binding capacity between the collecting agent and metal ions can be improved through a solid-loving group composed of the two hydroximido groups; the adsorption stability of the whole collector molecules on the surface of the mineral is enhanced, and the collecting performance and selectivity of the collector molecules are improved; meanwhile, a plasma pretreatment method is adopted for the raw ore, the surface structure of the ore is changed, impurities on the surface of the ore are reduced, the reaction activity of the surface of the ore is enhanced, and the surface property difference between the ilmenite and forsterite is improved, so that collecting agent molecules can chemically react with the surface of the ilmenite under the weak acid condition, and the flotation separation efficiency of the ilmenite is improved; and the consumption of sulfuric acid is reduced.

The invention belongs to the technical field of novel nano functional materials and electrochemical biosensor detection, and discloses a preparation method of an Au (at) Co-NC NSAs / 3D GF composite material, the composite material and application of the composite material. The method comprises the following steps: (1) putting three-dimensional graphene foam into a mixed solution in which the concentration of cobalt nitrate hexahydrate is 0.0006 mol / L to 0.1 mol / L and the concentration of dimethylimidazole is 0.0006 mol / L to 0.1 mol / L, and keeping at room temperature for 2 to 12 hours to obtain ZIF-67 nanosheet array / three-dimensional graphene foam; (2) carrying out heat treatment on the ZIF-67 nanosheet array / three-dimensional graphene foam at the temperature of 300-900 DEG C for 1-5 hours to obtain cobalt nanoparticle anchored nitrogen-doped carbon nanosheet / three-dimensional graphene foam; and (3) measuring 5-50 [mu] L of a gold nanoparticle solution with carboxyl, and dropwise adding the gold nanoparticle solution on the surface of the cobalt nanoparticle anchored nitrogen-doped carbon nanosheet / three-dimensional graphene foam to obtain the gold and cobalt nanoparticle anchored nitrogen-doped carbon nanosheet / three-dimensional graphene foam. The method is simple in process, environment-friendly and high in yield.

The application discloses a high-stability immobilized mannanase and a preparation method and application thereof, and belongs to the technical field of enzyme immobilization. The preparation method uses PAMAM modified SBA-15 / calcium alginate composite microspheres as a carrier to fix mannanase in an enzyme solution by adopting an embedding-covalent crosslinking method, so as to obtain the high-stability immobilized mannanase. The preparation method uses the PAMAM modified SBA-15 / calcium alginate composite microspheres as the carrier to fix the mannanase by adopting the embedding-covalent crosslinking synergistic method, so that the pH tolerance, the circulation stability and the hypoglycemic efficiency of the enzyme are improved, and the problems of the traditional immobilized enzyme, such as large enzyme activity loss, easy leakage and poor stability under high temperature, are solved.

The invention discloses a nucleic acid delivery carrier based on a nano aluminum adjuvant and application thereof, the nucleic acid delivery carrier is composed of an inner core, a middle layer and a shell from inside to outside in sequence, the inner core is a compound of cationic protein and nucleic acid, the middle layer is a lactide-glycolide copolymer (PLGA), and the shell is the nano aluminum adjuvant. The cationic protein can be tightly combined with nucleic acid with negative charges through electrostatic interaction to form a stable compound, so that the nucleic acid is prevented from being degraded; pLGA is introduced as a middle layer, the stability of the inner core can be further enhanced, and leakage of nucleic acid in the delivery process is prevented; the nano-aluminum is used as the outermost layer to provide an additional physical barrier, so that the stability and the biological safety of the whole delivery carrier can be enhanced, and nucleic acid is ensured not to be degraded or inactivated before reaching a target cell; therefore, the carrier provided by the invention can realize delivery of high nucleic acid drug loading capacity.

This invention belongs to the field of optical thin film technology for optical devices, and relates to a ligand and a method for modifying metal oxide nanoparticles using this ligand, as well as its applications. This method of modifying metal oxide nanoparticles using a multi-branched ligand containing phosphate groups achieves precise control of reaction conditions and environment through a multi-ligand combination-step reaction modification approach. This results in a richer effect of the surface organic components of the metal oxide nanoparticles, exhibiting more transparent organic dispersion under high concentrations of the same inorganic particles. Furthermore, the multi-branched ligand containing phosphate groups shows higher reactivity with the surface of hydroxylated metal oxide nanoparticles, resulting in a more significant modification effect, with the surface organic ligand accounting for no less than 20% by thermogravimetric analysis.

This invention discloses a wafer surface treatment process, comprising: providing a pre-cleaning chamber; introducing a wafer with an oxide layer formed on its surface into the pre-cleaning chamber and heating the wafer to 100°C to 300°C; introducing an etching gas with a first flow rate into the pre-cleaning chamber to perform a surface pre-treatment on the wafer for 1s to 3s; introducing the etching gas with a second flow rate, the second flow rate being less than the first flow rate, into the pre-cleaning chamber to remove the oxide layer on the surface of the wafer; wherein the pressure in the pre-cleaning chamber is maintained in the range of 0.8 Torr to 1.2 Torr. By synergistically utilizing temperature, flow rate, and pressure, the surface reactivity of the wafer is improved, the difference in reaction rates between new and old wafers is reduced, thereby ensuring the stability of the etching results.

The invention discloses a lithium iron phosphate positive electrode material, a preparation method thereof and a battery, and belongs to the technical field of batteries, the preparation method comprises the following steps: mixing an iron source, a lithium source, a phosphorus source, a dopant and a grinding agent, and carrying out dry ball milling to obtain precursor powder; and sintering the precursor powder under the protection of inert gas to obtain the lithium iron phosphate positive electrode material. According to the method, high-purity graphite / acetylene black is used as a grinding agent and a carbon source, a doping agent is added at the same time, a solvent does not need to be used, a ball-milled material does not need to be dried, uniform compounding of a precursor and construction of a conductive network are achieved in one step through the mechanochemical effect, and then the conductive network is obtained through high-temperature sintering. The prepared lithium iron phosphate positive electrode material has excellent electrochemical performance and relatively high compaction density, and still keeps relatively good electrochemical performance in a low-temperature environment, so that a new development direction is provided for production of lithium iron phosphate.

The application belongs to the field of advanced functional materials, and particularly relates to a curable polyimide composition, a polyimide adhesive film and a preparation method and use. The polyimide adhesive film is composed of polyimide adhesive containing unsaturated double bonds which can be crosslinked by microwave and is compounded on the surface of a polyimide film treated by ozone or supercritical CO2. The curing degree of the polyimide adhesive film can reach more than 99% under the treatment of 250-400W microwave power for 2-3 min, and the adhesive film can form extremely high adhesion between glass or copper foil. The polyimide adhesive film has the characteristics of easy curing, no volatilization, low shrinkage, high adhesion, etc., and has a wide application prospect in the fields of semiconductor packaging, flexible copper-clad plate, etc.

This invention discloses a method for preparing a ferromagnetic single-atom piezoelectric catalyst, the piezoelectric catalyst itself, and its application. The preparation method includes the following steps: weighing ammonium molybdate tetrahydrate and thioacetamide, dissolving them in ultrapure water, and stirring until a colorless and transparent solution is obtained; then adding nickel acetate tetrahydrate, continuing stirring, transferring the mixed solution to a high-pressure reactor, washing after the reaction, and drying to obtain the reaction product; spreading the reaction product evenly in a quartz boat, and finally calcining the reaction product at high temperature under a nitrogen atmosphere, and cooling to successfully prepare the Ni-MoS2 ferromagnetic single-atom piezoelectric catalyst. The piezoelectric catalyst prepared by this invention has good piezoelectric catalytic performance and can achieve high organophosphorus degradation efficiency in the treatment of phenylphosphonic acid wastewater.

The invention relates to the field of textile printing and dyeing, in particular to an anti-staining spray-dyed fabric and a preparation method thereof. The preparation method comprises the following steps: S1, preparing a spray-dyed fabric; s2, the spray-dyed fabric is mixed with fixation slurry for primary fixation, intermediate fabric is obtained, and the fixation slurry is prepared from a dyeing auxiliary, paste and water according to the mass ratio of (1-20): (50-80): (50-150); and S3, mixing the intermediate fabric with a color fixing solution, and carrying out secondary color fixing to obtain the anti-staining spray-dyed fabric. In the step S2, a specific amount of slurry locks moisture and provides a continuous and stable moist environment, and a dyeing auxiliary agent optimizes the surface reaction activity of the fabric, accelerates permeation of the dye into fabric fibers, improves the fixation rate of the dye and reduces dye contamination; and in the step S3, the fixation liquid is combined with the unreacted dye to seal the dye, so that the unreacted dye is precipitated, and the staining problem of the spray-dyed fabric is effectively solved.

This invention discloses a sensing material, preparation method, detection method, and application for detecting atmospheric carboxylic acids, belonging to the field of environmental functional materials technology. It solves the problems of complex operation and inability to achieve real-time online monitoring in existing methods. The sensing material for detecting atmospheric carboxylic acids is a MOF-802-EDTA-Pt composite film. Its preparation method includes: synthesizing MOF-802 material via a hydrothermal reaction using 1,3,5-benzenetricarboxylic acid (BTC) and aluminum nitrate as raw materials and ethylenediaminetetraacetic acid (Na-EDTA) as a ligand; dispersing MOF-802 in DMF to form a coating solution, and forming a film on a glass substrate using a dip-coating method; subsequently loading platinum nanoparticles, and obtaining the composite sensing film through a solvothermal reaction and vacuum drying. The MOF-802-EDTA-Pt composite film has a porous structure and fluorescence properties, achieving detection through the fluorescence quenching effect of carboxylic acid molecules and the MOF framework. The method of this invention has controllable process, high material stability, and is effective in detecting CO2. 2 NO 2 It maintains excellent selectivity even under conditions where other interfering substances coexist, making it suitable for real-time monitoring of carboxylic acid pollutants in the atmospheric environment.

The present application relates to the technical field of micro-nano manufacturing, and particularly relates to a nano-imprint template anti-adhesion treatment device, which comprises a reaction chamber and an anti-adhesion reagent conveying system, and can complete the whole process of template surface plasma activation, anti-adhesion reagent quantitative conveying and low-temperature vapor deposition in the same chamber; accurate control of microliter-level reagent is realized through a glue spraying valve and a multi-stage valve control system, low-temperature film forming is realized in combination with a heating evaporation dish, high-temperature damage to a flexible template is avoided, plasma in-situ activation enhances surface reactivity, and the adhesion of an anti-adhesion layer is improved. The present application solves the problems of process dispersion, uneven film layer and poor compatibility of traditional equipment, significantly improves the quality of the anti-adhesion layer and the service life of the template, and is suitable for high-precision nano-imprint processes in the fields of semiconductors, optical devices and the like.

The invention belongs to the technical field of electrochemical energy storage materials, and particularly discloses a layered-structure cuprous tetrathiotungstate positive electrode material for a rechargeable magnesium battery, a regulation and control method of a specific crystal face of the layered-structure cuprous tetrathiotungstate positive electrode material and application of the layered-structure cuprous tetrathiotungstate positive electrode material. Effective regulation and control on the exposure proportion of the high-activity crystal face (such as (101) crystal face) of the Cu2WS4 crystal are realized, and the magnesium storage specific capacity and the rate capability of the material are remarkably improved. The preparation method is simple and controllable in process, mild in condition, rich in raw material source and low in cost, and has good repeatability and application prospects.

The invention provides a preparation method of lithium / sodium doped gallium nitride, lithium / sodium doped gallium nitride and application, the preparation method comprises the following steps: S1, melamine, a benzene solution of gallium trichloride and lithium nitrate or sodium nitrate are ground and mixed to obtain a mixture A, n (melamine) = n (gallium trichloride) + n (lithium nitrate or sodium nitrate), and n represents the amount of substance; s2, transferring the mixture A into a reaction furnace, heating the reaction furnace to 800 DEG C under the protection of gas, keeping the temperature for 6 hours, and naturally cooling to room temperature to obtain a solid B; and S3, washing and drying the solid B to obtain the lithium / sodium doped gallium nitride powder. According to the preparation method of the lithium / sodium-doped gallium nitride, regulation and control of the macrostructure and the microstructure of the lithium / sodium-doped gallium nitride are realized by controlling the molar ratio of gallium trichloride to lithium nitrate or gallium trichloride to sodium nitrate, the preparation method is simple and reliable, and the effect of improving the interface energy storage of the gallium nitride is remarkable.

The utility model relates to a reactor for preparing an inorganic polymeric flocculant from fly ash. The reactor comprises a first channel, a second channel, a third channel, a fourth channel, an inner grinding cavity and an outer grinding cavity, the second channel is arranged around the periphery of the first channel; the third channel is arranged around the periphery of the second channel; the fourth channel is arranged around the periphery of the third channel; the inner grinding cavity is arranged below the first channel, the second channel, the third channel and the fourth channel and is communicated with the first channel, the second channel and the third channel; and the outer grinding cavity is arranged below the inner grinding cavity and is communicated with the inner grinding cavity. According to the design of the reactor disclosed by the utility model, multi-level material input and mixing are realized. The mixing uniformity of materials can be improved, and the full proceeding of chemical reaction is promoted.

This invention discloses a walnut-shaped In2O3 / CuO material, its preparation method, and its applications, comprising the following steps: Step 1: solvothermal synthesis of a bimetallic coordination polymer precursor; Step 2: controllable pyrolysis of the precursor to convert it into a target oxide composite material; This invention addresses the difficulty of synergistic regulation of heterostructures and oxygen vacancies in existing methods by proposing a one-step solvothermal-programmed pyrolysis method to prepare a walnut-shaped In2O3 / CuO heterojunction composite material with a three-dimensional hierarchical porous structure and controllable oxygen vacancies, thereby achieving simultaneous optimization of material structure, composition, and defects to improve low-temperature Cl2 sensing performance.