53results about How to "Reduce electrostatic repulsion" patented technology

The invention provides an intrinsic magnetic MXene material and a preparation method and application thereof, the preparation method comprises the following steps: S1, mixing an aqueous solution of MXene with an alkaline reagent, and carrying out ultrasonic dispersion to obtain a mixed dispersion liquid; freezing the mixed dispersion liquid into a solid by liquid nitrogen; the alkaline reagent is potassium hydroxide or sodium hydroxide; s2, the obtained solid is subjected to freeze drying, and the Archimedes screw type MXene aerogel is obtained; s3, the Archimedes spiral type MXene aerogel is subjected to heat treatment under the protection of inert gas, and the intrinsic magnetic MXene material is obtained. The invention designs and develops a single-component pure MXene electromagnetic wave absorbing material on the premise of not introducing magnetic nanoparticles.

The invention discloses a three-sludge treatment agent and a preparation method thereof, and belongs to the technical field of oily sludge treatment, the three-sludge treatment agent comprises a treatment agent A and a treatment agent B. The treatment agent B comprises the following raw materials by mass: 30-40 parts of polyacrylamide, 8-10 parts of modified attapulgite clay, 5-6 parts of a compound, and 40-55 parts of deionized water. The modified attapulgite clay is strongly combined with protective films at oil-water and oil-sludge interfaces in the oil sludge through electrostatic force, hydrogen bonds and hydrophobic interaction, the protective films at the oil-water and oil-sludge interfaces are destroyed, oil drops are released and coalesced to form an oil phase, and separation of oil, water and sludge is achieved; positive charges carried in the modified attapulgite clay can be adsorbed to the surfaces of sludge particles with negative charges to be settled and separated out; carboxyl groups contained in the modified hemicellulose can be combined with hydrophilic groups of sophorolipid to form stable mixed micelles, so that the situation that the sophorolipid is easily influenced by the environment to lose efficacy, and oil drops are regathered and precipitated is avoided.

The invention discloses a cationic coating digital ink-jet printing pretreatment liquid and a preparation method and application thereof, and the preparation method comprises the following steps: in the presence of a chain transfer agent, copolymerizing a cationic monomer and a water-soluble nonionic monomer to obtain the cationic coating printing pretreatment liquid; the pretreatment liquid is finished on the fabric, the pretreatment liquid and electronegative coating particles printed on the fabric through jet printing form electrostatic attraction through the cationic property of the pretreatment liquid, the electronegative coating particles are deposited on the surface of the fabric, permeation is avoided, and the apparent color yield of the fabric is improved; meanwhile, as the electrostatic adsorption efficiency is high, the slurry amount for pretreatment is reduced, the influence of the slurry on the hand feeling of the fabric is small, and the hand feeling of the jet-printed fabric is improved. Besides, benefited from the control of the chain transfer agent and the copolymerization of the hydrophilic monomer, the resin in the pretreatment liquid is low in molecular weight, high in water solubility and easy to wash away, and the staining resistance of the pigment printed fabric is also improved when the pigment printed fabric is worn and washed with water.

The invention belongs to the technical field of building materials, and particularly relates to a low-carbon cementing material for preparing a high-speed roadbed and a preparation method of the low-carbon cementing material. The main component mineral powder of the cementing material is subjected to amination treatment, the fly ash is subjected to sulfhydrylation treatment, and the modified gypsum and the citric acid carbon quantum dot doped red mud are introduced, so that the high-speed roadbed low-carbon cementing material is prepared, it is guaranteed that the cementing material has proper final setting time, and the compressive strength and the breaking strength are effectively improved.

The invention relates to the technical field of sewage treatment, and discloses a cationic etherifying agent composition for sewage treatment and a preparation method thereof. The cationic etherifying agent composition for sewage treatment is obtained by mixing gemini imidazoline quaternary ammonium salt etherified starch, a chitosan-based graft modified copolymer and poly-aluminum silicate. Nitrogen atoms on an imidazoline ring and a pyrrole ring, hydroxyl and amino can form hydrogen bonds in the flocculation process, so that the interaction between the composition and colloidal particles is enhanced, and the flocculation effect is improved; positive charges in quaternary ammonium salt can react with negative charges carried by suspended particles in sewage, so that the particles are more easily gathered, and the flocculation performance is improved; chitosan and starch molecular chains are relatively long, so that a plurality of pollutant molecules can be adsorbed at the same time, and a bridging effect is achieved; a gemini imidazoline quaternary ammonium salt structure and a cation modified pyrrolidone structure are introduced into starch and chitosan molecules, so that active sites of the starch and chitosan molecules are increased, and the flocculation effect is further enhanced.

This invention discloses a compound traditional Chinese medicine powder inhaler for respiratory tract infections and its preparation method, relating to the field of pharmaceutical formulation technology. The compound traditional Chinese medicine powder inhaler for respiratory tract infections is composed of polysaccharide composite gel microspheres, forsythia, scutellaria, honeysuckle, and isatis root. The polysaccharide composite gel microspheres are composed of seaweed sulfated polysaccharide, lentinan, calcium chloride, and curcumin. Seaweed sulfated polysaccharide, lentinan, curcumin, and calcium chloride cross-link to form a three-dimensional network spherical structure, improving the particle morphology and flowability of the micropowder. Furthermore, due to its good hygroscopic and moisturizing properties, it competitively reduces the moisture absorption of the micropowder, preventing aggregation and further improving flowability. In addition, the gel microspheres have excellent adhesion, adhering to the infection site after entering the respiratory tract, reducing expulsion losses due to respiration, maintaining an effective drug concentration at the infection site, and improving therapeutic efficacy.

The application provides a shield balancing mud for a shield machine and a preparation method thereof, and belongs to the field of shield tunnel engineering. The shield balancing mud comprises the following raw materials: modified clay base material: 100 parts, composite flocculating agent: 6-15 parts, tackifying water-retaining agent: 1.5-4 parts, water-dispersing agent: 0.5-2.5 parts, organic crosslinking agent: 0.3-1.2 parts, thixotropy adjusting agent: 0.2-1.5 parts, and pH adjusting agent: 0.5-4 parts. In the application, the high-activity modified clay is used as a skeleton, the inorganic flocculation network is used to provide a dense structure resistant to water erosion, the borax-cellulose reversible crosslinking is used to realize the thixotropic property, the polyacrylamide is used to enhance the water-dispersing resistance, and the thixotropy adjusting agent is used to balance the dispersion and flocculation, so that the mud material simultaneously has excellent water-dispersing resistance and reversible thixotropy in a high-water-pressure water-rich stratum.

The invention belongs to the technical field of fine chemicals, and discloses a black talc whitening composite powder and a preparation method thereof. The method of the present invention comprises the following steps: the raw black talc ore is crushed and dry-ground to obtain black talc powder; the black talc powder is mixed with water, formulated into a powder slurry, and constant temperature wet grinding is carried out after mixing with a grinding aid and a dispersant to obtain a black talc slurry; the black talc slurry is mixed and ground with titanium dioxide slurry and a flocculant, and liquid phase mechanochemical coating is carried out to obtain a core-shell composite slurry; the core-shell composite slurry is flash dried, depolymerized and broken up to obtain a black talc whitening composite powder. The above method of the present invention significantly improves the whiteness of black talc, expands the application field of black talc, can be whitened without high energy consumption, improves the resource utilization rate of black talc, and meets the requirements of energy conservation and environmental protection.

The application discloses a composite flocculant based on aluminum chloride and a preparation method thereof, and belongs to the technical field of flocculant preparation, and is used for solving the technical problem that the stability and flocculation performance of the flocculant need to be further improved in the prior art; the branched polymer containing polycarboxyl groups is prepared by the reaction of tris(2-aminoethyl)amine and pyromellitic dianhydride, and the taurine groups are introduced to obtain the sulfobranched polycarboxyl polymer; the titanium phosphorus silicon aminopropyl composite is synthesized by using the sol-gel method, and the inorganic-organic network combination is realized; the polyimidazolium-hydroxy ether is obtained by the reaction of imidazole, epichlorohydrin and bisphenol A diglycidyl ether; the composite flocculant is formed by the reaction of the three under the acidic condition, the composite flocculant combines the polycarboxyl groups, the sulfonic acid groups, the imidazolium groups and the inorganic-organic skeleton, has high charge density, good adsorption and bridging performance, can rapidly form stable flocs, and can effectively remove the suspended particles and organic pollutants in water.

The invention provides a composition, a kit and a method for detecting African swine fever virus, and relates to the technical field of gene detection. The primer group and the probe provided by the invention are used for detecting the African swine fever virus, the probe is a ZIPNA probe, the ZIPNA probe comprises a 5 '-terminal fluorophore, a 3'-terminal quenching group and a spermine group, and the ZIPNA probe can provide higher detection specificity because non-specific binding and background signals can be more effectively reduced. The positive ions coupled with the ZIPNA probe can neutralize negative charges of target nucleic acid and reduce electrostatic repulsion, and meanwhile, the ZIPNA probe coupled with a certain number of positive ion groups can reach a preset Tm value. The ZIPNA probe can effectively replace a small groove conjugate and locked nucleic acid, and can be used in various application fields based on nucleic acid detection. The ZIPNA probe has the advantages of being high in detection fluorescence increment, high in detection specificity, good in repeatability, high in sensitivity and the like, and practical application is facilitated.

The application discloses a salt-resistant water-non-dispersible material for oil well cement and a preparation method thereof. The salt-resistant water-non-dispersible material for oil well cement comprises the following components in the form of weight parts: 100 parts of N,N-dimethyl acrylamide, 3-6 parts of acrylic acid, 10-20 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5-15 parts of a cyclic monomer, 0.1-0.4 parts of a branching agent, 5-15 parts of a cationic monomer, 0.3-3 parts of a crosslinking agent and 400-500 parts of water. The salt-resistant water-non-dispersible material prepared by the application has good salt resistance, can significantly improve the anti-dispersion performance of the cement slurry when used in a salt water and sea water cement slurry system with a NaCl content of 18 wt% or less, and has excellent rheological performance.

The invention relates to a quick-washing residue-free laundry detergent. The quick-washing residue-free laundry detergent is prepared from the following raw material components: a double-block nonionic surfactant, an anionic surfactant, a biological enzyme compound, a thickening agent and an auxiliary agent, wherein the diblock type nonionic surfactant is ethoxylated and propoxylated C16-18 alcohol, and the diblock type nonionic surfactant is ethoxylated and propoxylated C16-18 alcohol. The core innovation of the invention lies in that ethoxylated propoxylated C16-18 alcohol is adopted as a main surfactant, is synergistically compounded with an anionic surfactant and a biological enzyme system, and is combined with PEG-120 methyl glucose sesquistearate to form a composite surfactant system with the characteristics of rapid wetting, low-foam rapid bleaching and no residue.

The present application belongs to the technical field of preparation of multi-curved surface silicon carbide, and discloses a preparation method of reaction sintering multi-curved surface silicon carbide whole plate, comprising: mixing 100 parts of alpha-SiC powder, 15-20 parts of composite carbon source, 1-2 parts of silicon carbide fiber, 2.3-3.8 parts of dispersing agent, 8-12 parts of water-soluble phenolic resin, 2-4 parts of additive and 42-46 parts of water according to weight parts, pre-dispersing, ball-milling, spray granulating, pressing into multi-curved surface green body; the green body is stacked with graphite support parts and filled with graded silicon particles, and is subjected to step-by-step degreasing and step-by-step reaction sintering under vacuum argon, and then is cooled after temperature control to obtain the product. Through the synergistic effect of formula control of composite carbon source, specific ternary additive and fine sintering process, the technical problem of sintering cracking and cracking of multi-curved surface whole plate is eliminated, and the product density, bending strength and fracture toughness are effectively improved.

The utility model relates to a centrifuge tube rack which comprises a base, and inclined fixing parts and horizontal spacing parts which are arranged on the base, the inclined fixing parts and the horizontal spacing parts are alternately distributed and are integrally in a step shape, and fixing holes matched with centrifuge tubes in shape are formed in the inclined fixing parts. The center axes of the fixing holes are perpendicular to the plane where the horizontal spacing parts are located, and the diameters of the fixing holes located in the same inclined fixing parts are the same. Compared with the prior art, the utility model has the advantages that the arrangement regularity of the centrifugal tubes is stronger, the risk of taking the centrifugal tubes by mistake is reduced, and the like.

The invention discloses a decolorizing agent for wastewater treatment and a preparation method thereof, and belongs to the technical field of sewage treatment. The decolorizing agent for wastewater treatment is prepared from the following components in parts by mass: 40 to 60 parts of modified molecular sieve, 10 to 30 parts of polyaluminum chloride and 2 to 5 parts of anionic polyacrylamide, according to the decolorizing agent for wastewater treatment, the characteristics of inorganic and organic flocculants are integrated, the adsorption capacity of the decolorizing agent for wastewater treatment on wastewater pollutant components is improved by virtue of the synergistic effect of multiple flocculants, the components are matched with one another, industrial wastewater can be rapidly decolorized, the water treatment efficiency is improved, the cost is reduced, and the decolorizing agent is suitable for industrial wastewater treatment. By modifying the molecular sieve, the decolorizing effect of the decolorizing agent for wastewater treatment on wastewater is remarkably improved.

The application belongs to the technical field of demulsification dehydration, and discloses a preparation method of a demulsifier and application of the demulsifier in asphalt mixture. The preparation method of the demulsifier comprises the following steps: reacting acidified clay minerals with gamma-methacryloxypropyltrimethoxysilane to obtain modified clay minerals; reacting the modified clay minerals with triethylenetetramine to obtain polyamine-based clay minerals; and reacting the polyamine-based clay minerals with bromohexadecane to obtain the demulsifier. The demulsifier is a polyquaternary ammonium salt type cationic demulsifier. Through the positive charges of cations contained on the surface of the clay minerals and quaternary ammonium salts, the double electric layer structure of the surface of anionic emulsified asphalt is changed, the thickness of the double electric layer is compressed, the electrostatic repulsion between the emulsified asphalts is reduced, and the demulsification effect is good. When the asphalt mixture is prepared, the adhesion of asphalt particles to aggregates can be effectively promoted, the water in the asphalt mixture can be effectively discharged, and the solidification and molding of the asphalt mixture can be accelerated.

The invention belongs to the technical field of wastewater treatment, and discloses a self-emulsified oil wastewater remover and a preparation method thereof. The self-emulsified oil wastewater remover comprises the following raw materials in parts by weight: 30-50 parts of sulfomethylated tannin, 15-25 parts of aluminum sulfate, 0.5-2 parts of polyacrylamide, 1-3 parts of sodium hydroxide and 10-20 parts of polyaluminum chloride. According to the method, the sulfomethylated tannin is applied to removal of the self-emulsified oil wastewater, and the emulsification state of oil drops is effectively destroyed through the emulsification destroying effect of the sulfomethylated tannin, so that oil-water separation is promoted. The macromolecular structure and active groups of the modified tannin provide more adsorption sites and a stronger bridging effect, and the oil drop aggregation speed and efficiency are improved.

The invention relates to an oxygen vacancy-enriched potassium vanadate zinc ion battery positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of aqueous zinc ion battery positive electrode materials. In order to solve the problem that oxygen vacancies introduced into a positive electrode material V2O5 are unstable in the battery circulation process, the invention provides an oxygen vacancy-enriched potassium-zinc vanadate ion battery positive electrode material which is potassium ion doped hydrated vanadium pentoxide. The high-stability oxygen-vacancy-enriched potassium vanadate zinc ion battery positive electrode material is obtained by accurately regulating and controlling the doping concentration and preparation process parameters, and the stability and the electrochemical performance of the material in the circulation process and the diffusion kinetics of zinc ions are improved. When the material is applied to the aqueous zinc ion battery, the material shows relatively high energy density and power density and excellent electrochemical performance and cycling stability, a test of 12000 cycles is carried out under the current density of 10Ag <-1 >, and the capacity retention rate after the cycles is close to 90%.

This application relates to the field of demulsifiers, and more specifically, to an oil sludge demulsifier, its preparation method, and its application. An oil sludge demulsifier comprises the following components in the following mass ratio: 20-35 parts of a surfactant complex, 7-12 parts of an alkyl sulfate sodium cosolvent, 0.6-1.8 parts of a stabilizer, and 48-55 parts of water; wherein the surfactant complex comprises hyperbranched polyamide amine and polyether amine modified magnetic nanoparticles. This oil sludge demulsifier improves upon the problems of existing demulsifiers, such as low dehydration capacity, slow dehydration speed, poor demulsification effect, and low oil content, thereby improving the demulsification performance and dehydration efficiency, and achieving effective separation of oil sludge.

The present invention provides a layered oxide positive electrode material for inhibiting the slippage of a transition metal layer and a preparation method thereof. The layered oxide positive electrode material is composed of a plurality of heterovalent ions doped simultaneously in the sodium layer, transition metal layer and oxygen layer of a sodium ion layered oxide. In the present invention, heterovalent cations with large ionic radius in the sodium layer of the material can play a role in supporting the transition metal layer; lithium ions in the transition metal layer can reversibly migrate between layers; and fluorine ions in the oxygen layer can improve the reversibility of the oxygen reaction. Therefore, the introduction of a plurality of heterovalent ions reduces the electrostatic repulsion between sodium layers in the material, thereby inhibiting the slippage of the transition metal layer at the end of charging, effectively alleviating the structural phase change of the layered oxide positive electrode material during the charging and discharging process, and significantly improving the electrochemical cycle stability and rate performance of the sodium ion battery.

The invention relates to an aluminum anode oxide film secondary self-assembly hydrophobic membrane sealing concentrated solution and a sealing method, and the aluminum anode oxide film secondary self-assembly hydrophobic membrane sealing concentrated solution comprises the following components in percentage by mass: 1%-5% of a sulfonate anionic surfactant, 0.1%-0.5% of a sealing accelerant, 2%-6% of inorganic salt, 0-0.03% of a bactericide, 0-0.05% of a defoaming agent and the balance of pure water. The sealing concentrated solution is used as a normal-temperature nickel-free and fluorine-free sealing solution, a secondary self-assembled hydrophobic sealing film can be formed on an anode oxide film sealed by a lithium salt sealing solution, the hole sealing degree and pollution resistance of the anode oxide film are improved, the state of the sealed surface of the anode oxide film is improved, the surface of the oxide film is in a uniform hydrophobic state, and the sealing effect of the anode oxide film is improved. No sealing ash exists and the hand feeling is smooth.

This invention relates to the field of medical blood purification equipment technology, and discloses a lipid adsorption material regeneration device, including a main body, a rotary switching module, an adsorption column module, a dynamic pressure balancing system, a fluid pipeline system, and a main controller. The rotary switching module drives the adsorption column module to switch between three stations: treatment, regeneration, and balancing preparation. The adsorption column module is filled with pH-responsive hydrogel material to achieve adsorption and regeneration functions. The dynamic pressure balancing system forms a magnetic circuit through a magnetic piston and electromagnetic drive components in a bypass pipe, which senses and adjusts the pressure inside the column in real time. The fluid pipeline system controls the connection of input and output connectors via an electric push rod to achieve fluid switching. The main controller integrates data from multiple sensors, including pressure, pH, and optical sensors, to intelligently terminate the regeneration process. This invention achieves in-situ online regeneration of the adsorption material, continuous uninterrupted treatment, and precise closed-loop control, improving treatment efficiency and safety, and significantly reducing consumable costs.

This invention belongs to the field of wastewater treatment technology and discloses a self-emulsifying oily wastewater removal agent and its preparation method. The self-emulsifying oily wastewater removal agent comprises the following raw materials in parts by weight: 30-50 parts of sulfomethylated tannin, 15-25 parts of aluminum sulfate, 0.5-2 parts of polyacrylamide, 1-3 parts of sodium hydroxide, and 10-20 parts of polyaluminum chloride. This invention applies sulfomethylated tannin to the removal of self-emulsifying oily wastewater. Through the emulsifying and disrupting effect of sulfomethylated tannin, the emulsified state of oil droplets is effectively destroyed, thereby promoting oil-water separation. The macromolecular structure and active groups of this modified tannin provide more adsorption sites and stronger bridging effects, improving the speed and efficiency of oil droplet aggregation.

The present application discloses a self-thickening acidifying retarder and its preparation method, retarding acid liquid, and belongs to the field of oil and gas extraction technology. The acidifying retarder is obtained by polymerization reaction of monomer, acrylamide, [3-(methacrylamido) propyl] dimethyl (3-thiopropyl) ammonium hydroxide and 1-hexadecyl-3-vinyl imidazole bromide with double-tailed hydrophobic long carbon chain, specifically a polymer. The introduction of double-tailed hydrophobic long carbon chain significantly increases the probability of association between retarder molecules, which contributes to molecular aggregation. The retarding acid liquid includes the aforementioned acidifying retarder, 20% mass fraction of hydrochloric acid and cationic surfactant, and the retarding acid liquid can automatically thicken, reduce the migration speed of hydrogen ions to the rock surface in the acid liquid, and the acidifying retarding effect is excellent, and the retarding rate reaches more than 94%. And the retarding acid liquid provided by the present application has the advantages of low initial viscosity value, excellent temperature resistance, and easy gel breakage.

The present invention relates to a concentration method for improving the concentration and activity of methanogens in anaerobic digestion inoculum. The concentration method of the present invention comprises the following steps: providing a flocculant; adding an inoculant to a reactor, adding a flocculant, aerating with an inactive gas, and sealing the reactor; allowing the obtained sealed reactor to stand for stratification, removing the supernatant, and obtaining a bottom microbial flocculent precipitate; inoculating the microbial flocculent precipitate into an anaerobic bottle, adding an anaerobic culture medium and an organic carbon source, and aerating with an inactive gas; adding an oxidant and a complex vitamin to the anaerobic bottle, and culturing with an intermittent stirring method; adding an organic carbon source to the anaerobic bottle at intervals of 7-10 days, maintaining the culture temperature and stirring speed unchanged, stimulating the rapid proliferation of the restored active microorganisms, and obtaining a high-activity and high-concentration methanogen group. The present invention can improve the absolute number and methanogenic activity of subsequent methanogens by regulating and controlling some technical parameters during the concentration process.

The invention relates to the technical field of printing supplies, in particular to color paste as well as a preparation method and application thereof. The color paste provided by the invention is prepared from the following raw materials in percentage by mass: 60-80% of titanium dioxide, 6-28% of a dispersing agent, 3-10% of an organic solvent and the balance of deionized water, the dispersing agent comprises an acrylic block copolymer, and the amine value of the acrylic block copolymer is 15-20mg KOH / g. The acrylic block copolymer with the amine value of 15-20 mg KOH / g is used as a dispersing agent in the color paste, a stable adsorption layer can be formed on the surfaces of titanium dioxide particles through the acrylic block copolymer containing the amine groups, direct contact and aggregation among the particles are prevented, the dispersity and long-term stability of the color paste are improved, and the color paste has the advantages of being high in stability and good in stability. Meanwhile, negative charges of titanium dioxide are neutralized by amino, electrostatic repulsion among particles is reduced, titanium dioxide agglomeration is prevented, and the dispersity of titanium dioxide in the color paste is improved.

The present application discloses a non-flowback acidizing working fluid and its preparation method and construction process, which belongs to the field of oilfield chemical technology. The non-flowback acidizing working fluid includes a pretreatment fluid and a composite acid fluid, and the volume ratio of the pretreatment fluid to the composite acid fluid is 1: (2~10); the composite acid fluid includes an organic acid, hydrochloric acid and a cationic gemini surfactant; in terms of weight percentage, the composite acid fluid includes 15~25% of an organic acid, 1%~3% of hydrochloric acid, 0.2%~1% of a cationic gemini surfactant, and the remainder is water. The pretreatment fluid cleans and protects the casing of the oil well, dissolves the crude oil and organic scale on the surface of the reservoir; the organic acid, hydrochloric acid and the cationic gemini surfactant are compounded to obtain the composite acid fluid, and the organic acid is combined with the hydrochloric acid to improve the retarding performance, and the cationic gemini surfactant is combined, so that it has stronger surface activity and interfacial activity, is easier to form micelles, and has a good production increase effect.

The invention discloses a concrete prepared by using tunnel waste and a preparation method thereof, and relates to the field of building materials and engineering. The concrete prepared by using the tunnel waste comprises the following components by weight: 1800-2200 parts of tunnel waste, 300-450 parts of cement, 6-18 parts of polyaluminium ferric chloride, 2-10 parts of carboxymethyl cellulose, 4-17 parts of water reducer, and 135-225 parts of water. The invention does not need to firstly perform secondary treatments such as crushing and shaping, washing and demuding the tunnel waste, and directly uses it to prepare concrete when the particle size is satisfied, so that conventional concrete construction and mechanical properties can be achieved, and the 28d cubic compressive strength can reach more than 34MPa.

This invention discloses a rapid self-assembly of Ti3C2T based on pH regulation. x The method for preparing MXene thin films is as follows: 1. Preparation of Ti3C2T x MXene dispersion; 2. Adjust pH to 1.5-3.0 with inorganic acid; 3. After stirring and settling, vacuum filter and self-assemble into a film; 4. After drying, peel off to obtain Ti3C2T. x MXene thin films. This invention introduces trace amounts of inorganic acid to regulate the surface charge and colloidal stability of MXene sheets, effectively weakening the electrostatic repulsion between sheets, significantly improving the film formation efficiency of vacuum filtration, and ensuring the quality of Ti3C2T films. x MXene films offer excellent conductivity and are simple and inexpensive to process, requiring no special equipment, making them ideal for achieving high-quality Ti3C2T. x The efficient and large-scale preparation of MXene thin films provides a reliable approach suitable for electromagnetic shielding, flexible electronics, and electrochemical energy storage.

The invention discloses a bacterial assembly as well as a preparation method and application thereof. The bacterial assembly is prepared from facultative anaerobic bacteria, double-terminated maleimide polyethylene glycol and cationic albumin, reducing disulfide bonds on the surfaces of bacterial cell walls through a reducing agent so as to expose sulfydryl, carrying out Michael addition reaction on double-terminal maleimide polyethylene glycol and sulfydryl, and connecting a plurality of bacteria with sulfydryl exposed on the surfaces to form the bacterial assembly. According to the reaction system, the cationic albumin is added to increase bacterial adhesion so as to enhance aggregation, meanwhile, bacterial surface antigens are effectively covered, and removal of immune cells is reduced. The bacterial assembly provided by the invention reduces the distribution of bacteria in normal tissues while increasing lung enrichment, has higher lung tumor targeting, and effectively improves the lung tumor treatment effect.