629 results about "Negative charge" patented technology

The invention discloses an arginine decarboxylase diaA enzyme mutant and application thereof in preparation of butanediamine, and belongs to the field of bioengineering. According to the invention, rational charge overturning transformation is simultaneously carried out on a pentamer meridian oligomeric interface and a dimer latitudinal oligomeric interface, so that stable assembly and efficient catalysis of the decamer under the condition of neutral to alkaline pH (7.0-9.0) are realized. Wherein positive charges are introduced into a meridian interface to weaken electrostatic repulsion, and negative charges are introduced into a latitudinal interface to enhance dimer compactness and substrate transfer efficiency. The specific enzyme activity of the representative double mutant AdiAD110K / H736E at pH 8.0 is about 35 times that of a wild type, and the representative double mutant AdiAD110K / H736E keeps a complete decamer state in a pH range of 7.0-9.0. The yield of butanediamine is up to 145.9 g / L under the whole-cell catalysis of the mutant.

The invention discloses a rational copolymerization strategy for improving the stability of an oligomeric structure of acid-induced high-order oligomeric decarboxylase AdiA in a neutral to alkaline environment and application of the rational copolymerization strategy, and belongs to the field of bioengineering. According to the strategy, rational charge overturning transformation is carried out on a pentamer radial oligomeric interface and a dimer weft-wise oligomeric interface at the same time, and stable assembly and efficient catalysis of a decamer under the condition that the pH value is from 7.0 to 9.0 from neutral to alkaline are achieved. Wherein positive charges are introduced into a meridian interface to weaken electrostatic repulsion, and negative charges are introduced into a latitudinal interface to enhance dimer compactness and substrate transfer efficiency. The specific enzyme activity of the representative double mutant AdiAD471K / E467K / H736E is 45.5 times that of a wild type when the pH value is 8.0, and the representative double mutant AdiAD471K / E467K / H736E keeps a complete decamer state when the pH value is 7.0-9.0. The yield of butanediamine is up to 156.5 g / L by using the mutant to catalyze whole cells.

This invention belongs to the field of marine antifouling, and specifically relates to a transparent, self-lubricating organosilicon hybrid antifouling coating with a negatively charged surface and its preparation method. The antifouling coating is obtained by a sol-gel reaction of modified nanocellulose, hydroxy acid, and functional fluorine / siloxane monomers; the mass ratio of the hydroxy acid to the modified nanocellulose is 10–100:1; the mass ratio of the functional fluorine / siloxane monomer to the modified nanocellulose is 10–300:1. This invention, based on a multi-element green antifouling strategy, constructs a material surface with negative charge, self-lubrication, and low surface energy. The prepared antifouling coating exhibits excellent transparency, mechanical properties, and static antifouling performance. This antifouling coating is environmentally friendly and has broad application prospects in the field of marine antifouling.

The invention discloses an artificial SEI material and a preparation method thereof, an artificial SEI film and an artificial SEI film modified negative electrode. The artificial SEI material is an organic polymer brush (CNF-g-PSSX) prepared by grafting cellulose nanofibers with polystyrene sulfonate. The polymer brush is of a crystal structure and has a firm framework; and the side chain of polystyrene sulfonate has rich-SO3 functional groups which are matched with cations in sulfonate, so that a rapid ion transmission channel is provided, high-current-density circulation can be realized, and good interface contact is ensured. Due to a special molecular topological structure and a multi-component synergistic effect, when the organic polymer brush forms an artificial SEI film, high mechanical strength, high ionic conductivity and low interface impedance can be obtained at the same time, and through strong electrostatic repulsion between a negatively charged-SO3 group and the surface of a negatively charged lithium dendrite tip, the electrochemical performance of the artificial SEI film is improved. An obvious inhibition effect is shown on the continuous growth of dendritic crystals.

The invention relates to the technical field of concrete admixtures, in particular to ultra-dispersed high-activity silica mortar, a preparation method and application thereof and a component, the ultra-dispersed high-activity silica mortar comprises silica mortar, the silica mortar contains polyelectrolyte, and the pH value of the silica mortar is 8-13; the polyelectrolyte is a linear carboxylic acid polymer and a salt thereof. The pH value of the silica fume slurry is adjusted to 8-13, and the dispersion effect of the polyelectrolyte containing carboxylic acid groups is combined, so that the charge property of the surfaces of silica fume particles is changed, the absolute value of the ZETA potential is increased, the highest absolute value of the ZETA potential can reach 50 mV or above, the strong negative electricity on the surfaces of the silica fume particles enables the particles to generate the electrostatic repulsion effect, and the particles are prevented from being damaged. The silicon ash particles can be effectively prevented from getting close to each other and being agglomerated by matching with the steric hindrance of the polyelectrolyte containing the carboxylic acid group, so that the dispersity of the silicon ash slurry is further improved, the dispersion stability is good, and the suspension rate in 30 days is basically 99.5% or above.

The invention discloses a negative charge leakage circuit, a rapid chip negative charge leakage method and a radio frequency chip. The negative charge leakage circuit comprises a leakage circuit module and a control signal module, the bleeder circuit module comprises a first PMOS (P-channel Metal Oxide Semiconductor) tube, the source electrode of the first PMOS tube is grounded, and the drain electrode of the first PMOS tube is connected with the negative voltage potential of the chip; the input end of the control signal module is used for receiving an enable signal, and the output end of the control signal module is connected with the grid electrode of the first PMOS tube; the control signal module is used for outputting a corresponding control signal according to the received enable signal so as to control the first PMOS tube to be in a conduction state or a cut-off state; the first PMOS tube is used for discharging negative charges in the chip when the first PMOS tube is in a conducting state. According to the invention, the discharge speed of negative pressure in the chip can be improved, and the reliability of the chip in repeated power-on and power-off starting is improved.

The invention provides an exosome enrichment method based on a modified cellulose material, which comprises the following steps: carrying out TEMPO oxidation on plant residue cellulose to prepare a cellulose material with a carboxyl structure; the cellulose structure is further refined by adopting mechanical shearing and high-pressure homogenizing means, so that the specific surface area and the dispersion stability are remarkably improved; through polyethyleneimine PEI grafting, a large number of amino functional groups are introduced, the surface electropositivity of the material is enhanced, and efficient adsorption and enrichment of exosomes with negative charges are achieved. The invention also provides the exosome prepared by the method. The modified cellulose material disclosed by the invention is wide in source, simple and convenient to prepare and mild in enrichment process, the separation purity and the enrichment efficiency of the exosome can be remarkably improved, and the modified cellulose material has good biocompatibility and environmental friendliness; compared with existing ultracentrifugation, density gradient centrifugation and immunoaffinity separation methods, the method has the advantages that the operation process is simplified, the equipment dependence and reagent cost are reduced, and the potential of large-scale production and clinical application is achieved.

The invention belongs to the technical field of semiconductor device simulation, and particularly relates to a method for rapidly calibrating BDTI surface potential and a related device. The method comprises the following steps: establishing a CIS BDTI device structure through simulation software; introducing silicon data, and calibrating an ion distribution curve in the device structure by taking a true value of SIMS concentration as a reference to obtain a device simulation model for concentration distribution calibration; replacing a surface high dielectric constant layer of the device simulation model for concentration distribution calibration with an electrode layer; and introducing the actually measured potential of the high dielectric constant layer of the device into the electrode layer to complete the surface potential calibration of the device. According to the invention, the surface high dielectric constant layer is directly replaced by the electrode layer, so that the potential of the surface high dielectric constant layer can be directly set as the potential of the actually measured high dielectric constant layer, the process of collecting, continuously increasing and adjusting positive and negative charges for many times and continuously adjusting the potential value of a High K material is avoided, and the calibration process is remarkably shortened.

The invention discloses a method for preparing a silicon-carbon composite negative electrode material through an electrostatic self-assembly technology, and belongs to the technical field of lithium ion battery negative electrode materials. According to the invention, lignin is used as a biomass carbon source and lauryl sodium sulfate (SDS) and poly (diallyldimethylammonium chloride) (PDDA) are used as activators through a simple electrostatic self-assembly technology; a proper amount of nano silicon and PDDA are subjected to in-situ adsorption, and lignin and SDS are subjected to in-situ adsorption; a self-assembly process is carried out through the positive and negative charge attraction effect among colloidal particles, so that effective compounding of the nano silicon particles and the biomass carbon is realized; and performing vacuum drying, and performing one-stage sintering in a tubular furnace to obtain the silicon-carbon composite negative electrode material. Based on the problems of non-uniform particle size, easy agglomeration and great abrasion of a silicon-carbon composite material in a traditional mechanical synthesis technology, the invention improves the compounding efficiency of the silicon-carbon material and improves the problems of volume expansion of a silicon negative electrode, slow migration rate of lithium ions, poor cycle performance and the like.

The invention discloses a simulation self-cleaning decorative cloth UV printing ink coating device, and relates to the technical field of printing, the simulation self-cleaning decorative cloth UV printing ink coating device comprises a bearing base, a conveying roller set is fixedly installed at the right end of the upper portion of the top of the bearing base, and through cooperation of a powder particle adsorption assembly, an ink transfer printing assembly and a vibration assembly, the powder particle adsorption assembly and the ink transfer printing assembly are matched; positive and negative charges generated by the positive and negative conductive metal plates cover the peripheral side of the surface of the coating rod, the adsorbability of charge particles on the surface of the printing fabric is improved, a direct-current electromagnetic field is formed outside the coating rod through the feeding motor, the lead screw and the three sets of magnetic rings, and the titanium dioxide is further made to be evenly dispersed in the coating rod under the matching of the mass of the titanium dioxide. The titanium dioxide can be singly captured by charges covering the surface of the fabric to be printed, accumulation of titanium dioxide on the surface of the printed fabric is reduced, and the phenomenon that in the subsequent printing operation process, due to the fact that gaps exist between ink and the printed fabric, ink blocks fall off in the subsequent printing and drying operation is reduced.

The invention relates to the technical field of pharmaceutical preparations, and provides double-shell JAK inhibitor nanoparticles, a preparation method thereof and targeted delivery eye drops. The double-shell JAK inhibitor nanoparticle provided by the invention comprises a core, an inner shell and an outer shell, wherein the core comprises a nanostructure lipid carrier and a JAK inhibitor; the inner shell layer is a cationic polymer, and the outer shell layer is hyaluronic acid. Through the design of the positive charge inner shell layer and the negative charge outer shell layer, the dual functions of mucosa adhesion and active targeting are achieved, the surface of the nanoparticle is electronegative finally, cytotoxicity possibly caused by direct exposure of a cationic polymer is reduced, non-specific aggregation of the cationic polymer and electronegative protein in tears is avoided, and the stability of tears is improved. And the stability of the preparation is improved. The eye drops provided by the invention can obviously prolong the residence time of the JAK inhibitor on the ocular surface, enhance the cornea permeability, can actively target to ocular inflammatory cells, and have a wide application prospect.

The present invention addresses the problem of how to effectively and efficiently extract, separate, and recover high-concentration PFAS contained in water regardless of the type of PFAS. An organic fluorine compound is converted to a chemical species having a negative charge on the basis of ionization by acid dissociation of the organic fluorine compound, molecularization of protonation-type hydrophobic cations, or both of these items, the distribution of the organic fluorine compound to an aqueous phase is promoted, and the organic fluorine compound is recovered.

The method is based on a core idea of unifying a field theory and an interference field theory, is devoted to exploration and expansion of an artificial field frontier technology, and covers an artificial field plus quality technology, an artificial field interference technology and an artificial field control space-time technology. In the research process, mutual verification of experiments and theories is paid attention to. Theoretically, internal correlation among Planck mass, electron mass, gravitational force, electric field force, magnetic field force and fine structure constants is deeply analyzed, a conclusion that the gravitational force, the electric field force and the magnetic field force are equal when a substance reaches a light velocity is obtained, and a unique quantum effect is presented. In the aspect of experiments, a simple verification method is adopted, and substances are placed in a positive electrode area and a negative electrode area respectively. Along with the enhancement of the electric field intensity and the action time, the substance mass in the positive electrode area is gradually reduced, and the substance mass in the negative electrode area is correspondingly increased. The phenomenon can be explained as that the space where the positive charges are located has divergence characteristics and the space where the negative charges are located has convergence characteristics, so that the masses of the substances in the positive and negative electrode areas are changed alternately.

The invention discloses a preparation method of stable spray granulation silicon nitride slurry and granulation powder, and belongs to the technical field of ceramic materials. According to the invention, absolute ethyl alcohol is adopted as a solvent, so that the problem that silicon nitride slurry is easy to hydrolyze is solved, and the temperature during spray granulation is reduced. On the basis that a dispersing agent is added into slurry, tetramethylammonium hydroxide is added into the slurry, the Zeta potential value of the slurry is increased, the slurry is made to be in an alkaline environment, dissociation of Si-OH groups is promoted, more negative charges are carried on the surface of silicon nitride, meanwhile, zwitterions released by the tetramethylammonium hydroxide form a double-electron layer around silicon nitride particles, and therefore the conductivity of the silicon nitride particles is improved. The dispersity of the particles in the slurry is improved. The silicon nitride powder is more uniformly distributed in a medium such as a binder due to the improvement of the dispersibility, and the silicon nitride slurry with low viscosity, good dispersibility, good stability and good fluidity can be prepared. The slurry can be more symmetrically gathered and formed in the spray granulation process, and the sphericity degree and apparent density of granulation powder are improved.

The invention discloses a zwitter-ion modified acrylate dielectric elastomer film and a preparation method thereof. Zwitter-ions can be selected from sulfobetaine methacrylate (SBMA), carboxyl betaine methacrylate (CBMA), sulfobetaine acrylamide (SBAA) and the like. The acrylate monomer can be butyl acrylate (BA), dodecyl acrylate (LA), isoamyl acrylate (EHA) and the like. Zwitterions (special compounds which simultaneously carry equal positive and negative charges on the same molecule and are electrically neutral on the whole) are copolymerized into an acrylate dielectric elastomer through photo-initiated free radical polymerization reaction, zwitterionic clusters uniformly distributed in the dielectric elastomer can construct traps for capturing high-energy electrons, the leakage current of the material is reduced, and the dielectric property of the material is improved. And the intrinsic breakdown field strength of the material is improved. In addition, the mutual attraction effect between dipole ions with positive and negative charges in the structure provides driving force for intrinsic self-repairing. And after being electrically and mechanically damaged, the material can be self-recovered, so that the service life of the material is prolonged.

The invention discloses a covalent organic framework with oxidation-reduction activity and a bionic nano-channel structure as well as a preparation method and application of the covalent organic framework, and belongs to the technical field of environmental protection. According to the preparation method, 2, 4-dihydroxybenzene-1, 3, 5-tricarboxaldehyde and 2, 5-bis (allyloxy) terephthaloyl hydrazine are taken as raw materials, a two-dimensional covalent organic framework with oxidation-reduction activity is synthesized, and then a sulfonic acid group with negative charges is covalently grafted, so that a functional material with a bionic nano-channel structure is formed. The material has regular porous channels and rich functional sites, the porous channels provide efficient mass transfer paths and adsorption spaces for uranyl ions, and the functional sites realize specific recognition of the uranyl ions through oxidation-reduction reaction and electrostatic interaction, so that the material shows synergistic advantages of strong selectivity, high adsorption capacity and rapid adsorption kinetics on uranium. The method is simple and low in cost, and the prepared material is clear in structure, good in hydrophilicity, capable of efficiently adsorbing uranyl ions and good in application prospect.

The invention provides a cation exchange membrane chromatography medium and a preparation method and application thereof, the cation exchange membrane chromatography medium comprises a homo-porous membrane, polydopamine is loaded on two side surfaces and in a pore structure of the homo-porous membrane, and a cation exchange functional ligand is grafted on the polydopamine; a homogeneous pore membrane is selected as a matrix membrane, polydopamine is loaded on the surface and in an internal pore structure of the homogeneous pore membrane, and then a cation exchange functional ligand is further grafted, so that the surface of a chromatography medium of the obtained cation exchange membrane has relatively strong negative charges, and biomolecules with positive charges can be effectively adsorbed, thereby being separated from biomolecules with negative charges; meanwhile, the membrane is relatively low in transmembrane pressure and relatively high in separation degree, also has the characteristics of high permeability and high selectivity, and is suitable for being applied to separation and purification of biological drug macromolecules.

The invention provides a self-repairing modified graphene water-based coating composition as well as a preparation method and application thereof. Graphene is modified through free radical polymerization of 4-styrylpyridine (BPP) on the surface of graphene, and then coulomb interaction between protonated positive charges of BPP polymer graphene and negative charges of phosphotungstic acid anions is realized, so that the self-repairing modified graphene water-based coating composition is obtained. According to the present invention, the combination effect needs to be optimized by regulating the pH value of the solution, the obtained coating material has characteristics of high corrosion resistance, high self-repairing ability and high mechanical property, and the coating can be used in the fields of self-building cleaning exterior walls, automobile finishing paints, sea-crossing bridges, offshore wind power towers, chemical pipelines, and mobile phone / computer shell antistatic coatings.

The invention provides an electrostatic chuck and semiconductor equipment, and belongs to the technical field of semiconductor preparation. According to the electrostatic chuck, the charge generator is connected with the ejector pin assembly, when the wafer needs to be desorbed on the electrostatic chuck, the charge generator is started, due to residual positive charges on the upper surface of the dielectric layer, set charges generated by the charge generator are negative charges, and the charge generator conducts the generated negative charges to the ejector pin assembly. When the ejector pin assembly jacks up the wafer, the ejector pin assembly is full of negative charges, and the negative charges counteract the positive charges on the upper surface of the dielectric layer, so that the adsorption force between the wafer and the electrostatic chuck is reduced, and the wafer and the electrostatic chuck can be better desorbed in the desorption process; the situation that the wafer and the electrostatic chuck cannot complete smooth desorption and the wafer is damaged is avoided, and the technical problem that in the prior art, the wafer is damaged in the desorption process due to poor electricity removal in a J-R type electrostatic chuck is solved.

The invention relates to a preparation method of a carboxylate dispersant and an application of the carboxylate dispersant in a suspending agent, and belongs to the technical field of dispersants.The carboxylate polymer containing carboxyl, polyethylene glycol and slow-release chelating agent nanoparticles are polymerized together to form a comb-shaped structure; the sulfonic acid group on the carboxylate dispersant is ionized into-SO3-, the surfaces of pesticide particles are negatively charged, the electrostatic repulsion in the system is enhanced, the collision among the softened pesticide particles can be weakened, the sedimentation trend of the pesticide nanoparticles is weakened to a certain extent, and the stability of the suspension system is improved. Meanwhile, sodium ethylene diamine tetracetate in the slow-release chelating agent nano-microspheres can be slowly released, the sodium ethylene diamine tetracetate is preferentially chelated with calcium ions and magnesium ions in water, the calcium ions and the magnesium ions are prevented from being combined with sulfonic acid and carboxylic acid groups on the carboxylate dispersing agent, and the comb-shaped structure of the carboxylate dispersing agent has strong steric hindrance, so that the carboxylate dispersing agent can be used for dispersing calcium ions and magnesium ions in water. The effect of physically blocking calcium and magnesium ions can be achieved.

The invention discloses a high-performance Mg < 2 + > / Li < + > separation nanofiltration membrane and a preparation method thereof, the Mg < 2 + > / Li < + > separation nanofiltration membrane is a polymer composite membrane, and is composed of a surface separation layer and a support layer; the surface separation layer is formed by self-assembling a polycation electrolyte and a polyanion electrolyte layer by layer, the supporting layer is formed by ultraviolet grafting of any one or two of sodium polystyrene sulfonate, polymethylacrylic acid 3-sulfonic acid propyl ester potassium salt and polyacrylic acid on the surface of a hydrophobic polymeric membrane, and the surface of the supporting layer is negatively charged. The negative charge amount of the supporting layer is gradually reduced from top to bottom; the whole separation membrane has the characteristics that the upper layer is hydrophilic and the lower layer is hydrophobic. By adjusting the charge density and aperture of the supporting layer, the structure of the surface separation layer is influenced, the charge repulsion effect, aperture screening effect and built-in electric field intensity of the whole membrane are enhanced, and the Mg < 2 + > / Li < + > separation factor is increased. Permeation and rapid transportation of water are promoted by virtue of a hydrophilic upper-layer and hydrophobic lower-layer structure, and the membrane flux is improved; the preparation process is simple, and the used solvent is water, so that the method is green and environment-friendly and has a good application prospect.

The invention belongs to the technical field of coated glass, and particularly provides a deposition method of a metal seed layer in TGV metallization and magnetron sputtering equipment. The invention aims to solve the problem of serious surface discharge phenomenon caused by low adhesive force between a metal film and a glass substrate, low metal coverage rate and step rate in a through hole and high accumulated charge on the surface of glass in the existing TGV metallization process. The independent and controllable ion source is introduced to assist deposition, the ion source is started at different stages of metal film deposition, and directional and high-energy positive ion flow generated by the ion source is utilized to bombard the surface of the glass substrate so as to assist the magnetron sputtering process, so that the surface of the glass substrate is subjected to magnetron sputtering. Through shallow ion implantation, enhancement of surface migration energy of deposited metal atoms and neutralization of negative charges accumulated on the glass surface, the adhesive force between metal and a glass substrate is improved, the metal coverage rate and the step rate in a through hole are improved, surface discharge is inhibited, and therefore the process stability is improved.

The application discloses a preparation method of a high-density and high-stability conductive polymer film based on electrochemical polymerization, and comprises the following steps: using an oxidant solution and a BFDO monomer solution to pretreat a formed foil to obtain a working electrode, then immersing the working electrode and a reference electrode into an electrolyte to perform electrochemical oxidation polymerization, and obtaining the high-density and high-stability conductive polymer film based on electrochemical polymerization. The pretreated formed foil containing N-type conductive polymer PBFDO is prepared by using a chemical in-situ polymerization method on the formed foil, and when the pretreated formed foil is applied in the field of capacitors, the conductivity and electron transport capacity of the capacitor can be improved, and the stability problem caused by the coupling of positive and negative charges in the traditional capacitor is greatly improved.

The invention relates to the technical field of water treatment, and discloses a silicon powder conditioner and a preparation method thereof, the silicon powder conditioner comprises 20-40% of an inorganic coagulant, 5-15% of an organic polymer coagulant, 3-10% of a natural polymer coagulant aid, 10-25% of a demulsifier, 2-8% of a synthetic coagulant aid, and the balance of water. The demulsifying agent is compounded with various coagulants and coagulant aids, the demulsifying agent preferentially destroys an oil-water interfacial film, releases wrapped silicon powder and eliminates the'colloid protection 'effect of oil stains on the surface of the silicon powder, and the inorganic and organic coagulants rapidly perform electrical neutralization and adsorption bridging on exposed silicon powder particles to form floc which is good in settling performance and easy to filter. Meanwhile, the inorganic coagulant provides positive charges and efficiently neutralizes the microfine silicon powder with negative charges; cPAM with high molecular weight and PDADMAC with strong cations form long-chain bridging and patching effects, so that fine particles with the particle size of 1-5 microns are specially captured, and meanwhile, larger-particle silicon powder is improved to form floc which is easy to filter; the natural polymer further increases the volume and density of the floc, and prevents the floc from being broken under shearing.

The invention belongs to the field of nano sensors, and discloses an electrochemical sensor based on a porous silicon-platinum nanoflower-DNA composite material and a preparation method and application thereof. A porous silicon layer is prepared on a polished surface of a silicon wafer, then platinum nanoflowers and a T-rich sulfhydrylation DNA probe are modified, a metal film is plated on the other surface of the silicon wafer, and the electrochemical sensor is prepared and applied to melamine detection. The DNA probe can adsorb melamine on the surface of a material through a hydrogen bond and generate current response linearly related to the concentration of the melamine; hydroxyl on the surface of the porous silicon can enhance the adsorption effect on melamine; the platinum nanomaterial with the flower-shaped structure can enhance the sensitivity of the sensor; in addition, negative charges carried on the surface of the porous silicon and common coexisting substances of melamine have an electrostatic repulsion effect, so that the sensor has good selectivity. The high-performance nano sensor provides a novel method with practicability for on-site rapid detection of melamine.

The invention relates to the technical field of soil improvement, and provides a method for efficiently utilizing saline-alkali land along the Yellow River district, which comprises the following steps: S1, preparing soil by a powder ridge machine when the saline-alkali land is dry, vertically penetrating into the soil through a spiral bit of the powder ridge machine, stopping descending of the spiral bit when an anti-electric conduction distance exists between the spiral bit and the top of an underground water level layer, and stopping descending of the spiral bit at an initial stage; transversely cutting the soil at a high speed of 26-35R / min for 3-5 minutes by using a spiral drill bit of the powder ridge machine, so that the spiral drill bit is negatively charged; s2, deep scarification and deep ploughing of the saline-alkali soil are conducted by the spiral drill bit at the low speed of 9-15 R / min; in the deep scarification and deep tillage process, electronegative composite microbial particle bacterial manure and electronegative enhanced super absorbent resin are sprayed, and a negative charge modified soil layer and a positive charge blocking layer are formed. The salt content of the soil is reduced by at least 0.1-0.3%, the pH value of the soil is reduced by 0.5-1, and the organic matter of the soil is increased by more than 0.05-0.1% at low cost and high efficiency.

The application discloses a preparation method of low-chlorine magnesium oxide. The method comprises the following steps: adding high-chlorine magnesium hydroxide slurry into an electrolytic cell, adding an anode liquid into an anode chamber, adding a cathode liquid into a cathode chamber, and adding a reinforcing agent into the high-chlorine magnesium hydroxide slurry. A direct current electric field is applied between the anode and the cathode by using a pulse power source to remove chlorine. Under the action of the electric field, the negative-charged chlorine ions move to the anode chamber by electromigration, and the chlorine moves to the cathode chamber by electrodialysis in the form of chlorides or other soluble ions, so as to reduce the concentration of the chlorine ions in the high-chlorine magnesium hydroxide slurry. After the chlorine is removed, the magnesium hydroxide is filtered and calcined to obtain the low-chlorine magnesium oxide. The method has the advantages that the high-energy-consumption processes such as ball milling and calcining in the traditional chlorine removal process of magnesium hydroxide are avoided, the harm of the chlorine ions to the equipment is reduced, the chlorine ions in the magnesium hydroxide are removed only by electromigration and electrodialysis, and the green and efficient preparation of the low-chlorine magnesium oxide is realized.

The invention discloses a preparation method of a piezoelectric response type hybrid ceramic membrane, which is characterized in that polyvinylidene fluoride powder is used as a base material of the membrane, propylene carbonate or ethylene carbonate is used as a diluent, negative-voltage-loaded piezoelectric ceramic modified nanoparticles are doped, and a proper amount of inorganic piezoelectric nanoparticles are doped, so that the electrical property of the pressed membrane is remarkably improved; a negative charge group introduced to the surface of the membrane through surface grafting is combined, so that the relative content of beta crystal forms of the polyvinylidene fluoride membrane is increased, and finally efficient interception and excellent anti-pollution effects on humic acid are achieved.

The invention discloses a near-infrared two-region photosensitive molecule, a preparation method of the near-infrared two-region photosensitive molecule and application of the near-infrared two-region photosensitive molecule in preparation of suture lines, belongs to the technical field of medical materials, and synthesizes an aggregation-induced emission organic photosensitizer molecule T-TBT-P for near-infrared two-region emission. The AIE nano aggregate carrying positive charges is formed by self-assembly of hydrophilic and hydrophobic groups of the molecule in water; preparing a polydopamine nano coating on the surface of the suture line by using a dopamine oxidation auto-polymerization method, so that the surface of the suture line carries negative charges and has super-hydrophilicity; finally, the T-TBT-P nano aggregate is loaded on the surface of the suture line through the electrostatic adsorption effect, finally, the diagnosis and treatment integrated suture line is prepared, and the diagnosis and treatment integrated suture line has good antibacterial, subcutaneous tracing and tissue adhesion resisting performance and has good application prospects.

The invention discloses an aggregation-induced emission photosensitizer as well as a preparation method and application thereof. A D-A-pi-A-D symmetrical structure is adopted, the spatial effect and the conjugation degree are adjusted through a pi bridge, the molar absorption coefficient is increased, and singlet excitons are increased; and furthermore, a pyridine ring with positive charges is used for accelerating electron transfer, the yield of triplet excitons and ROS is improved, compared with a traditional photosensitizer, the ROS efficiency is improved by 2-3 times, the efficient killing capability of the photosensitizer on pathogens can be ensured, and a guarantee is provided for rapid healing of infectious wounds. A pyridine ring with positive charges is introduced into an MTCNPy molecule, and the targeting property of the photosensitizer to pathogens is enhanced by utilizing the electrostatic interaction between the pyridine ring and a bacterial negative charge cell membrane, so that the damage to surrounding healthy tissues is reduced. The preparation process is simple, the cost is low, and the hydrogel has excellent hydrophilicity and biocompatibility so as to be more suitable for the biological environment.