342 results about "Chemical activity" patented technology

The invention belongs to the technical field of wafer processing, and discloses a multi-section high-flatness wafer cutting method which comprises the following steps: S1, wafer pretreatment and stress buffer layer preparation; s2, performing layered rough cutting by using a diamond blade; s3, plasma fine cutting and interface repairing; s4, performing multi-layer cooling and surface polishing; and S5, surface quality closed-loop detection is carried out. According to the method, copper layer residues and resin carbonization defects are synchronously eliminated. Cryogenic treatment induces lattice reconstruction through ultrafast phase change and blocks a chain reaction of dislocation defects, so that the intrinsic mechanical strength of the material is recovered, and a chemical mechanical polishing system activates the self-repairing characteristic of the material while removing a sub-surface damaged layer through the synergistic effect of abrasive chemical activity and mechanical shearing force, so that an atomic-scale smooth interface is formed, and the self-repairing performance of the material is improved. A closed-loop detection system depends on multi-dimensional data fusion and ion beam fixed-point repair, accurate positioning and performance recovery of cross-scale defects are achieved, and the electrical integrity of a chip functional area is ensured.

The invention discloses a plasma surface activation pre-bonding-femtosecond laser connection integrated process, belongs to the technical field of advanced dissimilar material precision connection, and particularly relates to a multi-material interface efficient connection method based on plasma surface activation pre-bonding and femtosecond laser processing. The method is suitable for high-strength and low-thermal-damage heterogeneous bonding of transparent materials (such as glass, quartz and sapphire) and transparent materials or metal materials (such as titanium alloy, stainless steel and invar alloy). According to the method, interface atomic-scale cleaning and chemical activity regulation and control are achieved through plasma activation, interface connection of the two materials is induced by combining the femtosecond laser ultrafast nonlinear effect, and the bottlenecks that in a traditional connection technology, optical contact depends on a mechanical clamp, and heat input is uncontrollable are broken through; and an innovative solution is provided for cross-material interface functional manufacturing in the fields of photoelectric device packaging, optical-electronic integrated systems and the like.

The invention relates to a honeycomb catalyst for CO and NOx synergistic coupling removal and a preparation method, the catalyst takes nano TiO2-CeO2 as a carrier, and the surface of the carrier is loaded with an active component; the active component comprises a main catalyst and an auxiliary catalyst, the main catalyst is LaCuOx active powder, and the auxiliary catalyst is SmFeOx active powder. According to the present invention, the active material of the conventional catalyst is changed, and the carrier performance of the conventional catalyst is modified, such that the catalyst has good chemical activity and good thermal stability so as to achieve the purpose of stable and synergistic CO removal and NOx removal; meanwhile, the catalyst material is high in mechanical strength and long in chemical life, and the water resistance and the sulfur resistance of the catalyst material are also verified.

The invention discloses a synthesis method of a hydrazine dicarboxylate modified cerium dioxide abrasive, and belongs to the technical field of precise polishing materials. The method comprises the following steps: taking cerous nitrate as a raw material, and preparing a cerous carbonate precursor through an ammonium carbonate precipitation reaction; and grinding and calcining the obtained precursor and hydrazine dicarboxylate to obtain the CeO2 grinding material with the surface rich in oxygen vacancies. And Ce < 4 + > can be partially reduced into Ce < 3 + > by reducing fragments generated by decomposition of the hydrazine dicarboxylate in the calcining process, so that an oxygen vacancy structure is formed through induction, and the chemical activity and the reaction rate of the abrasive are improved. The obtained grinding material shows excellent performance in chemical mechanical polishing (CMP) of K9 glass, the material removal rate (MRR) is increased by about 3.6 times compared with that of unmodified CeO2, the surface roughness (Ra) is reduced to about 0.16 nm or below, and grinding material particles are good in dispersity and less in agglomeration. The used hydrazine dicarboxylate is stable, low in toxicity and mild in reaction, and the particle size can be prevented from excessively growing while the high oxygen vacancy concentration is kept.

The invention relates to the technical field of biomedical materials, and provides a preparation method and application of cross-linked carboxymethyl cellulose. The preparation method comprises the following steps: S1, dissolving anhydrous calcium chloride in absolute ethyl alcohol, sterilizing and filtering to obtain a sterile calcium chloride solution; s2, adding the dehydrated and purified sodium carboxymethyl cellulose into a sterile calcium chloride solution, and stirring for reaction; s3, after the reaction is finished, suction filtration is performed, filter residues are collected and washed, residual calcium chloride is removed, then vacuum drying is performed, and cross-linked carboxymethyl cellulose is obtained. The cross-linked carboxymethyl cellulose and sodium carboxymethyl cellulose have high consistency in chemical activity, physiological and biochemical activity, biocompatibility and safety risk, but in physical performance, the cross-linked carboxymethyl cellulose is hydrogel fiber, is insoluble in water, can more remarkably maintain the volume of a filling part, and is longer in duration time, so that the cross-linked carboxymethyl cellulose is more stable in filling. And the effects of instant filling and long-acting filling of the microsphere-containing surface filling agent are realized.

The utility model provides an electronic device which comprises a first structural member and a second structural member, the first structural member comprises a first metal matrix, the second structural member comprises a second metal matrix and a decoration layer arranged on one side of the second metal matrix, and the first metal matrix is electrically connected with the second metal matrix. The corrosion potential of the first metal matrix is lower than that of the second metal matrix; an insulating layer is further arranged on the side, away from the second metal base body, of the decorative layer, the insulating layer is a transparent or semitransparent layer, and the impedance of the insulating layer is larger than or equal to 2000 ohms. The insulating layer is arranged on the decorative layer on the second metal matrix with high corrosion potential, so that a potential difference caused by a closed loop formed between the metal matrixes with different chemical activities can be prevented in a sweat environment or a salt mist environment, and the probability of electrocorrosion of the first metal matrix with low corrosion potential is further reduced; and the long-term use requirement of the electronic equipment is well met.

A fluid sampling tool is locatable in a borehole for sampling formation fluid including a chemically active component from a formation. The fluid sampling tool includes a sample chamber including a fluid inlet and an interior, wherein the interior includes a substrate and a reagent attached to the substrate, and wherein the reagent is configured to react with the chemically active component of the formation fluid to form a reaction product. The fluid sampling tool also includes a pump operable to pump a sample of the formation fluid in from the formation through the probe and into the sample chamber. A formation fluid sample flows into the sample chamber and a chemically active component of the formation fluid sample reacts with the reagent to form the reaction product from which a presence and concentration of the chemically active component in the formation fluid sample is determinable

The invention discloses zwitterion co-doped CeO2 abrasive particles and a preparation method and application thereof.The preparation method includes the steps that a cerium source and a soluble carbonate precipitator are subjected to an aging reaction to obtain a cerium-based precursor, and the cerium-based precursor, fused salt, metal ions and a fluorinating agent are mixed and then roasted to obtain the zwitterion co-doped CeO2 abrasive particles; the synthesis method is simple, the size is controllable, the particle size distribution is uniform, and the spherical-like zwitterion co-doped CeO2 abrasive particles are obtained; the co-doped CeO2 abrasive particles have excellent photo-assisted chemical mechanical polishing performance; when the polishing solution prepared from the sphere-like co-doped CeO2 abrasive particles synthesized by the method is used for processing the surface of quartz glass, the material removal rate reaches 988.69 nm / min, and a high material removal rate is obtained due to the fact that the co-doped CeO2 abrasive particles synthesized by the two-step method shorten the forbidden bandwidth and have high chemical activity, so that the material removal rate is favorably improved.

The present invention relates to an agrochemical composition comprising an agrochemical active ingredient and a cleaning composition comprising a cleaning additive, each further comprising at least one novel graft polymer comprising a polymer main chain (A) as a graft matrix having grafted polymer side chains (B) thereon. The polymer side chain (B) is obtainable by polymerization of at least one vinyl ester monomer (B1) and optionally a further monomer. The polymer backbone (A) comprises a polyalkylene oxide-derived moiety and a moiety derived from a lactone and / or a hydroxy acid, which moieties are mixed such that the polymer backbone contains ester functional groups within the polymer chain. The graft polymers of the compositions of the invention have been found to be suitable as dispersants for pesticidal agents in agrochemical compositions, and also suitable in cleaning compositions for improving cleaning properties. In addition, the graft polymer typically exhibits a suitably high degree of biodegradability and thus allows for a more environmentally friendly formulation. The graft polymer itself and its production are also claimed.

The invention discloses an O3-type high-capacity high-stability high-entropy sodium ion battery positive electrode material, which is characterized in that the molecular formula is NaaMxNyRzO2, M is a metal atom set for providing capacity, M is a FeNiCuCo or AlNiCuCo atom set, N is a metal atom set for increasing voltage, N is a ZnLiSb atom set, R is a metal atom set with a stable structure, R is a MnTiMg atom set, 0.8 < = a < = 1, 0.45 < = x < = 0.55, 0.1 < = y < = 0.2, 0.3 < = z < = 0.4. A metal atom set for providing capacity, a metal atom set for improving voltage and a metal atom set for stabilizing a structure are effectively combined together, so that the stability, the mechanical strength and the chemical activity of the material are enhanced, the diffusion degree of electrons / ions in the material is properly restrained, and the overall performance stability of the battery is improved.

The invention discloses a preparation method of plasma activated water based on a micro-nano bubble synergistic effect, and mainly solves the technical problems that the generation efficiency of liquid-phase active particles in the plasma activated water prepared by the existing method is low, the chemical activity of the plasma activated water is difficult to maintain and the like. The preparation method comprises the following steps: introducing micro-nano bubbles into pure water until the pure water is saturated to obtain micro-nano bubble water; then performing plasma activation treatment on the micro-nano bubble water within 3 minutes to obtain plasma activated water based on the micro-nano bubble synergistic effect; the gas adopted by the micro-nano bubbles is one of air, oxygen, nitrogen or helium. The chemical activity of the plasma activated water is enhanced, the maintenance time of the activity of the activated water is greatly prolonged, efficient production and long-acting storage of the plasma activated water are facilitated, and the method has great significance in biomedical application of the plasma activated water.

Described herein are electrochemically active-material structures comprising silicon and one or more inert elements, such that these inert elements are chemically and / or atomically dispersed. Also described are negative battery electrodes and lithium-ion electrochemical cells comprising such electrochemically active-material structures as well as methods of fabricating such structures, electrodes, and lithium-ion electrochemical cells. Some examples of atomically-dispersed inert elements include, but are not limited to, hydrogen (H), carbon (C), nitrogen (N), and chlorine (Cl). Unlike silicon, inert elements do not interact with lithium at an operating voltage of the negative battery electrode and therefore do not contribute to the overall cell capacity. At the same time, these inert elements help to mitigate silicon swelling by operating as a mechanical buffer, support structure, and / or additional conductive pathways. Such electrochemically active-material structures can be formed by reacting (chemically or electrochemically) one or more precursors that include silicon and corresponding inert elements.

The invention discloses a modified fly ash adsorbent for carbon dioxide capture and a preparation method and application thereof.The preparation method comprises the steps that original fly ash is ground into fly ash fine powder, the fly ash fine powder is subjected to stepped heating fluidization calcination in the N2 atmosphere containing water vapor, then microwave crushing treatment is conducted, and fly ash subjected to physical reaming treatment is obtained; carrying out alkali fusion reaction on the coal ash subjected to physical chambering treatment and alkali at high temperature, then alternately pickling by using two different acids to remove impurities, and carrying out oxidation treatment by using an oxidizing solution to increase surface alkaline sites and chemical activity so as to obtain chemically modified coal ash; loading a functional reagent on the chemically modified fly ash, reacting at a preset temperature, then adding a metal ion solution to carry out ion exchange, and then drying and carrying out hydrophobic modification to obtain the modified fly ash adsorbent. According to the invention, physical-chemical synergistic modification of fly ash is adopted to prepare the adsorbent with high adsorption performance, and the adsorbent is applied to capture of carbon dioxide.

The invention relates to the technical field of composite metal materials, in particular to a silver-coated graphene copper composite material and a preparation method thereof, and aims at solving the problems that traditional silver-coated copper powder is high in silver consumption, copper is oxidized due to the fact that a silver layer is prone to being damaged, and conductivity is insufficient. The method comprises the steps that a graphene coating layer is formed on a copper powder substrate in situ through chemical vapor deposition, and graphene copper powder is obtained; performing etching treatment on the graphene copper powder to controllably expose part of the copper substrate so as to form anchoring points for silver ion deposition; carrying out reduction treatment on the etched graphene copper powder so as to ensure that an anchoring site has chemical activity; in a reductive liquid phase environment, enabling a chemical silver plating solution to react with the graphene copper powder subjected to reduction treatment, and guiding silver ion deposition by utilizing an anchoring point, so as to form a silver coating layer on the surface of the graphene coating layer; and separating and drying the reacted system to obtain the silver-coated graphene copper composite material. The material is better in oxidation resistance and conductivity, and the process is free of waste liquid.

The invention provides a high-weather-resistance powder coating and a preparation method thereof, and belongs to the technical field of powder coatings. According to the invention, a hyperbranched polyester skeleton is constructed through esterification reaction of trimethylolpropane, adipic acid and maleic anhydride, hydroxyl-terminated polyether, pentaerythritol and 2, 4-dihydroxybenzophenone are introduced to adjust flexibility, thermal stability and ultraviolet aging resistance, and allyl glycidyl ether is utilized to improve chemical activity and network stability; phosphorus-containing heterocyclic ring-polynitrogen imide oligomer is generated through substitution reaction and subsequent modification of phosphonitrilic chloride trimer, aniline and ethanolamine, and the coating is endowed with flame retardance, heat resistance and adhesive force. In the preparation of the coating, carboxyl polyester resin and a curing agent are crosslinked to form a three-dimensional network, and filler and auxiliaries such as precipitated barium sulfate, silica powder and bismuth vanadate yellow pigment are combined, so that the mechanical strength, chemical resistance and ultraviolet aging resistance of a coating film are optimized.

The invention discloses an anti-reflection wear-resistant nano hydrophilic anti-fog lens and a preparation method thereof, and the method comprises the steps: carrying out the injection molding, ultrasonic deep cleaning and surface cleaning treatment of the lens, and obtaining a clean substrate layer; preparing an organic silicon resin hardening liquid, coating the surface of the substrate layer with the organic silicon resin hardening liquid, and curing to obtain an organic silicon resin layer; preparing a nano hydrophilic coating; cleaning the surface of the organic silicon resin layer, keeping the surface dry, and activating by using plasma equipment; and coating the surface of the activated organic silicon resin layer with a nano hydrophilic coating, and then baking at the temperature of 40-120 DEG C for 6-0.5 h to obtain the nano hydrophilic coating. According to the invention, a nano hydrophilic coating containing modified silicon dioxide is adopted to be in covalent bond connection with an active group in the organic silicon resin layer, so that lasting hydrophilic modification of the substrate layer is realized, a water drop contact angle is less than 6 degrees, super-hydrophilicity can be presented without illumination, and the super-hydrophilic group has low chemical activity, is not easy to pollute and is convenient to clean; the service life is long.

The invention discloses lignin-containing nanocellulose based on camellia oleifera fruit and cattail as well as a preparation method and application thereof, and relates to the technical field of production of biomass nanomaterials, the lignin-containing nanocellulose based on camellia oleifera fruit and cattail comprises the following components in percentage by mass: 8%-15% of lignin, 3%-8% of hemicellulose and 70%-90% of cellulose; the preparation method of the lignin-containing nanocellulose comprises the following steps: S1, treating oil tea fruit cattail; s2, performing DES pretreatment on the Camellia oleifera fruit powder; s3, performing acidolysis and centrifugation on the fruit peel cellulose to obtain lignin-containing nano cellulose; s4, dialyzing the nano cellulose containing the lignin; the lignin-containing nanocellulose is used for preparing the LCNF / PVA composite film, and the LCNF / PVA composite film can be used as a food preservative film; the lignin-containing nanocellulose prepared by the preparation method disclosed by the invention has high specific surface area, high surface chemical activity and good biocompatibility and degradability, and is widely applied to the field of food industry.

The invention relates to the technical field of oral care and anhydrous toothpaste, in particular to bioactive glass-containing anhydrous toothpaste based on rheological property regulation and control and a preparation method and application thereof.The anhydrous toothpaste adopts glycerin and polyethylene glycol as a humectant compound system to construct an anhydrous system, and the situation that active ingredients of bioactive glass lose efficacy when meeting water is avoided; and the chemical activity and the structural stability can be kept during long-term storage. A thickening agent compound system composed of carbomer, quaternary ammonium salt-22 and hydroxypropyl gelatin is cooperatively adopted, so that a rigid-soft, compact and firm spatial network structure can be formed, an abrasive and bioactive glass particles can be stably suspended for a long time, the high activity of bioactive glass is kept, and the bioactivity of the bioactive glass is improved. And in the aspect of rheological properties, the composite material shows excellent thixotropy, relatively high structure recovery rate and appropriate yield stress, and has a remarkable remineralization repair effect and an excellent sensory effect. And the preparation process is simple, low in cost and suitable for large-scale industrial production.

The invention relates to the technical field of metal material connection and surface engineering, in particular to MAB phase reinforced Cu-Sn-Ti active brazing filler metal and a preparation method thereof. According to the MAB phase enhanced Cu-Sn-Ti active brazing filler metal, an MAB phase serves as a strengthening phase and is layered ternary boride ceramic, M is Mo or Cr, A is Al, and the brazing filler metal comprises, by mass, 60%-65% of Cu powder, 15%-18% of Sn powder, 10%-12% of Ti powder and the balance MAB powder. The MAB phase ceramic with a unique layered structure and chemical activity is introduced, the interface reaction of a diamond / steel substrate can be actively regulated and controlled while dispersion strengthening of the brazing filler metal substrate is achieved, a tough and tough combined gradient interface is formed, and therefore the diamond composite wear-resistant coating with excellent comprehensive performance is obtained.

The invention discloses a silicon dioxide powder enhanced impact-resistant copper-clad plate and a processing technology thereof, which can effectively improve the dispersibility of silicon dioxide in epoxy resin and the interfacial strength of silicon dioxide and epoxy resin, thereby effectively improving the impact resistance of the copper-clad plate. In the modified silicon dioxide, a silane coupling agent is used for carrying out surface grafting modification treatment on nano silicon dioxide, and dopamine hydrochloride in a supplement is used for carrying out surface modification treatment on short carbon fibers; the preparation method comprises the following steps: carrying out interface modification treatment on a short carbon fiber and epoxy resin composite material by adopting polydopamine and nano silicon dioxide modified by a silane coupling agent; the chemical active groups and the roughness of the surface of the modified short carbon fiber are improved, and the bonding strength and the interface performance between the short carbon fiber and the epoxy resin can be enhanced.

The invention relates to the technical field of coatings, in particular to a wind power blade protective coating and a preparation method thereof. The preparation method comprises the following steps: preparing polyhydroxyalkanoate grafted modified sepiolite; preparing a composite anti-ultraviolet filler; preparing a copolymer emulsion; and preparing the wind power blade protective coating. Lignin and dopamine monomers are compounded to form a lignin / polydopamine composite material, zinc ions are introduced and inserted into the lignin / polydopamine composite material, finally, the composite anti-ultraviolet filler is obtained, lignin is biomass waste, low in cost and reproducible, rich phenolic hydroxyl groups and amino groups can be introduced through polydopamine coating, and the composite anti-ultraviolet filler is prepared. According to the invention, lignin is added to enhance the chemical activity and adsorption capacity, polydopamine can chelate zinc ions, promote uniform nucleation of the zinc ions on the surface of the composite material and prevent agglomeration of free zinc ions, lignin and polydopamine have good ultraviolet absorption capacity and have synergistic interaction with broadband ultraviolet shielding of the zinc ions, and the full-wave band anti-ultraviolet performance is improved.

The invention discloses a surface cleaning method for a large complex magnesium alloy structural part formed through electric arc additive manufacturing, and belongs to the field of post-treatment of formed structural parts after electric arc additive manufacturing. The method comprises the following steps that a mechanical arm is adopted to drive a special wire brush to conduct preliminary mechanical cleaning, and flexible contact is achieved through a mechanical sensor and a floating clamp; acidic cleaning liquid is sprayed to the surface of the workpiece through an ultrasonic spraying system, the surface color change is monitored in real time through a high-speed camera so as to control the reaction endpoint, and flushing and drying are conducted in time; and finally, carrying out fine cleaning under the protection of argon by adopting large-light-spot laser with low power density, and monitoring in real time through a spectrograph to ensure the cleaning effect. According to the method, the oxide layer and the pollutants on the surface of the large complex component can be efficiently, losslessly and automatically removed, the problem that the magnesium alloy WAAM component is difficult to clean due to high chemical activity and complex structure is solved, and the whole process is environmentally friendly and controllable.

The application provides a method for inkjet printing of oligonucleotides, and belongs to the technical field of in-situ synthesis of oligonucleotides.The method comprises the following steps: modifying the surface of a solid carrier with a chemically active functional group; depositing oligonucleotide synthesis reagents onto the surface of the modified solid carrier by inkjet to perform in-situ synthesis; and the solvent in the oligonucleotide synthesis reagents comprises one or two of glutaronitrile, acetonitrile and propylene carbonate.The application uses a new type of difficult-to-vaporize solvent, greatly reduces the volatilization of reagents during inkjet synthesis and the generation of organic vapors during synthesis, and thus maintains a high in-situ synthesis reaction efficiency of oligonucleotides.

The invention belongs to the field of automobile interior manufacturing, and discloses an automobile interior real wood surface digital printing process which comprises the following steps: S1, preparing a base material: selecting a wood veneer of 0.3-0.6 mm, cutting the wood veneer, polishing, spraying water for humidifying and mechanically leveling; the surface of the wood veneer is colored and sprayed with a transparent resin protection layer, then the surface of the protection layer is treated through a plasma surface treatment technology, and the surface energy and the chemical activity of the protection layer are improved; s3, digital printing: coating the surface of the treated protective layer with a bottom coating liquid, printing a pattern by using digital jet printing equipment, and then carrying out UV curing; s4, interior trim part forming, wherein the printed and cured wood veneer is attached to the automobile interior trim plastic base material at the temperature of 55-60 DEG C; and S5, surface layer protection: applying transparent protective finish paint on the surface of the laminated product. The process can solve the problems that the printing definition of an ink layer on the real wood surface of the existing automotive trim is low, and the ink layer is easy to peel, wrinkle and bloom in the processing or using process.

The invention discloses a multi-system new energy battery wide-temperature-range fire extinguishing material based on a selenium vacancy heterogeneous interface. The multi-system new energy battery wide-temperature-range fire extinguishing material is prepared from the following raw materials in percentage by weight: 6 to 10 percent of Vse-CoSe2 / FeSe2, 82 to 89 percent of carrier, 3 to 5 percent of ZrSe2 and 1 to 3 percent of polydiselenothiophene. The invention also provides application of the fire extinguishing material in a battery fire extinguishing agent. By precisely regulating the selenium vacancy concentration of the heterogeneous interface to be 5 * 10 < 18 >-1 * 10 < 20 > / cm < 3 > and the lattice matching degree to be smaller than or equal to 5%, directional inhibition of thermal runaway reactions of different battery systems is achieved, and the method is particularly suitable for battery safety protection in an extreme temperature environment (-45-600 DEG C). The fire extinguishing material maintains physical stability (no solidification / decomposition) and chemical activity (90% of free radical quenching efficiency gt) in a range of-45 DEG C (a vehicle-mounted battery in an extremely cold region) to 600 DEG C (battery thermal runaway peak temperature).

The application belongs to the technical field of inorganic nanometer material preparation, and particularly relates to a hollow manganese dioxide / cobalt manganate loaded nitrogen-doped carbon hybrid material and a preparation method thereof. The steps of the application are as follows: S1, dispersing manganese source material in N,N-dimethylformamide to form a uniform solution; S2, adding an organic ligand to the solution obtained in step S1 and continuously stirring to obtain a mixed solution, and then transferring the mixed solution to a reaction kettle for a solvothermal reaction; S3, sequentially washing and drying the product obtained through the solvothermal reaction, and then grinding the product and a cobalt salt to form a mixture powder; and S4, performing a high-temperature pyrolysis reaction on the mixture powder, and obtaining the hollow manganese dioxide / cobalt manganate loaded nitrogen-doped carbon hybrid material rich in mesopores and macropores after the reaction stops. The application has a large specific surface area and a multi-pore structure, slows down the migration and aggregation of metal particles and the loss of pyrolysis intermediates in the heat treatment process, and improves the electrochemical activity and stability of the transition metal / nitrogen-doped carbon electrocatalyst.

The invention discloses a preparation method of a medium-entropy MAX phase based on zirconium component regulation and control, which comprises the following steps: 1) material preparation: titanium, vanadium, zirconium, niobium, aluminum and graphite powder are used as raw materials, and the molar ratio of the zirconium element phase in transition metal elements is 8-25%; and 2) sintering: uniformly mixing all the raw materials, and carrying out sintering reaction under the condition of argon Ar protective atmosphere to obtain the medium-entropy MAX phases with different configurations. The controllable preparation of the quaternary medium-entropy MAX phase with brand new element combination is realized by accurately regulating and controlling the molar ratio of the zirconium element in the (Ti, V, Zr, Nb) n + 1AlCn system, and the phase purity is obviously improved; and the medium-entropy MXene material is further prepared by taking the medium-entropy MAX phase as a precursor. The prepared medium-entropy MAX phase has a compact layered structure, and the derived medium-entropy MXene presents an ultrathin and stable two-dimensional lamellar morphology, so that the medium-entropy MXene shows abundant electrochemical active sites and excellent conductivity, and shows good application prospects in many fields.

Photocatalytic sterilization technology is a technology that uses active substances generated by specific materials under light conditions to kill bacteria, viruses and other microorganisms. This technology mainly relies on the performance of photocatalytic materials, especially semiconductor materials such as titanium dioxide (TiO2). When the photocatalyst is irradiated by light of a specific wavelength, the electrons in the material transition from the valence band to the conduction band, forming electron-hole pairs. These electrons and holes have high chemical activity and can react with water or oxygen to generate free radicals with strong oxidizing ability, which can destroy the cell wall or cell membrane of microorganisms, causing the leakage of intracellular substances, thereby achieving the effect of sterilization. The present application aims to solve the problems of low light utilization rate and insufficient active sites of TiO2 photocatalytic materials, and proposes a TiO2@Ag / Ti-MOF functional material. The TiO2@Ag / Ti-MOF functional material is based on the Ti-MOF skeleton to construct Ag-MOF, realizing the controlled slow release of Ag ions and having a long-term effective sterilization effect.

The present application relates to a kind of synergistic repair sizing polyimide fiber sizing agent and its preparation method and application, the raw material of the polyimide fiber sizing agent is composed of solute A and solvent B, the solute A is multifunctional epoxy resin, the solvent B is low-boiling solvent, the low-boiling solvent is acetone or ethanol, the proportion of the solute A and the solvent B is as follows: A 0.1%~10%;B 90%~99.9% by weight percentage.The polyimide fiber sizing agent of the present application can be used to repair the internal structure defect of high-performance polyimide fiber and improve the chemical activity of fiber surface, can improve the roughness of fiber surface in a short time, ensure the surface chemical reactivity, repair the internal defect of fiber by the formation of internal crosslinking point, the tensile strength and compression strength of fiber are improved, and waste liquid is easy to recover, low in cost.

The present invention provides a composite microsphere for enhancing the efficacy of an agrochemically active ingredient, characterized in that the composite microsphere comprises chitosan having an average molecular weight in the range of 190,000 to 310,000 g / mol; and a crosslinking agent, in the absence of the agrochemically active ingredient. The present invention also provides an agrochemical formulation comprising the composite microsphere.