11results about How to "Improve surface reactivity" patented technology

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.

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.

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 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.