863 results about "Silver Nano" patented technology

The invention discloses a preparation method and application of a zinc-bromine flow battery positive electrode material, and belongs to the field of zinc-bromine flow batteries. The preparation method comprises the following steps: dissolving aniline and a dithio compound in an acidic ice bath, dropwise adding a peroxy strong oxidant to generate a polyaniline-disulfide bond copolymer, dialyzing, and freeze-drying to obtain powder; then heating soluble silver salt, a reducing agent, a hydrophilic dispersing agent and an organic sulfydryl silane coupling agent to prepare functionalized nano-silver particles; the powder and nano-silver particles are dispersed in N-methyl pyrrolidone for ultrasonic treatment, and dynamic self-repairing coating slurry is prepared; and performing acid pretreatment on the carbon fiber paper, and performing electrochemical deposition on the slurry to prepare the zinc-bromine battery positive electrode material. According to the zinc-bromine battery positive electrode material, the coulombic efficiency and the voltage efficiency of a zinc-bromine flow battery are remarkably improved and the cycle life of the zinc-bromine flow battery is remarkably prolonged through methods of dynamic covalent bonds, nano-silver catalysis, a hierarchical pore structure, carbon fiber pretreatment and the like, and the zinc-bromine flow battery positive electrode material has chemical stability, efficient bromine adsorption capacity and excellent catalytic activity.

The invention belongs to the technical field of aqueous zinc ion batteries, and discloses a preparation method and application of an aqueous zinc ion battery negative electrode coating material. The composite material is a silver-loaded carbon nitride composite material, and the composite material is used as a water-based zinc ion battery negative electrode artificial interface layer. A silver-loaded carbon nitride composite nano material is used as a zinc negative electrode interface coating. Silver nano ions can effectively improve electrostatic shielding on the surface of the zinc negative electrode, zinc ions are easier to deposit, and growth of zinc dendrites is inhibited; the material has excellent mechanical strength and chemical stability, so that the corrosion of electrolyte to the negative electrode is effectively inhibited; the protective layer is simple in preparation process, the prepared coating is high in adhesive force, a stable interface layer is easy to form, the half-cell cycle efficiency stability is obviously improved, the half-cell can stably circulate for 1323 circles, and the service life of the water-based zinc ion battery is prolonged.

The invention discloses silencing and mildew-proof organic silica gel as well as a preparation method and application thereof, and belongs to the technical field of organic silicon binding material polymers. Comprising the following components in parts by weight: 35-45 parts of nano calcium carbonate, 32-40 parts of hydroxyl-terminated polysiloxane, 5-9 parts of silencing powder, 0.5-2.5 parts of glass fiber powder, 5-9 parts of a hyperbranched polymer, 2-5 parts of a hydrophobic surface modifier, 1.5-3 parts of color paste, 1-2 parts of a water-based coupling agent, 1-2 parts of a cross-linking agent, 0.5-2.5 parts of a mildew preventive, 0.4-2 parts of a composite titanide and 0.4-0.7 part of nano silver powder. According to the invention, the nano silver powder and the mildew preventive are compounded, and an inorganic sterilization system is combined, so that broad-spectrum environment-friendly bacteriostasis is realized, and high-humidity long-acting protection is met; the powder is subjected to hydrophobic treatment, moisture is blocked, and high adhesion is kept; silencing powder serves as a core, a sound absorption network is cooperatively formed, the noise reduction capacity is improved, and the device is suitable for multiple scenes.

The invention relates to the technical field of biological materials, in particular to silver nano-chlorogenic acid composite hydrogel as well as preparation and application thereof. According to the invention, the CGA and the silver nitrate are used for green synthesis of the nano-particles CGA-AgNPs, and the nano-particles have peroxide nano-enzyme activity and antibacterial activity; and the CGA-AgNPs and chitosan (CS) are cross-linked to form the silver nano-chlorogenic acid composite hydrogel CGA-AgNPs-CS, so that the uniform distribution of nano-particles in the hydrogel can be promoted. According to the invention, multi-functionalization is taken as a target, a novel hydrogel composition system is designed from the source, the provided preparation method is green, simple, rapid and environment-friendly, the obtained composite hydrogel has multiple functions, and a good foundation is laid for expansion and application of the composite hydrogel in the biomedical fields of wound repair, wearable equipment, nano antibacterial drugs and the like.

The invention discloses a SiC power module sintering packaging method, and relates to the technical field of power module packaging, and the method comprises the steps: sequentially carrying out the ultrasonic cleaning, plasma activation and drying of a SiC chip and a ceramic substrate, and obtaining an activated ceramic substrate and a SiC chip; the surfaces of the activated ceramic substrate and the SiC chip are spin-coated with nano-silver paste, and a nano-porous silver layer is formed through pre-curing and low-temperature sintering; aligning the graphene / nano-porous silver composite layer chip with the ceramic substrate, performing segmented pressure sintering in a vacuum sintering furnace, and outputting a SiC power module; the SiC power module is subjected to epoxy resin packaging glue coating, ultraviolet light curing and annealing treatment, internal stress is eliminated, and the corrosion resistance is enhanced; and screening a SiC power module, performing XRD and SEM detection, coating a high-temperature-resistant silica gel sealing layer, performing curing, and outputting a finished product. Through the epoxy resin packaging adhesive coating and thermal-acoustic combined annealing technology, the residual stress of the packaging interface is released, the service life of the SiC power module is prolonged, and the adaptability of the SiC power module is improved.

The invention discloses self-cleaning antibacterial domestic ceramic and glaze and a preparation process thereof. The preparation process comprises the following steps: step 1, early-stage research and innovative conception; 2, determining a core raw material and a formula; step 3, pretreating the raw materials; step 4, glaze preparation process; step 5, preparing a domestic ceramic green body; step 6, glazing and sintering process; the preparation method has the advantages that nano titanium dioxide added in the glaze can generate free radicals with strong oxidizing property under illumination, organic pollutants on the surface of ceramic can be decomposed, the self-cleaning function is achieved, meanwhile, nano silver and silver-loaded zirconium phosphate have good antibacterial performance, breeding of various bacteria can be effectively inhibited, the anti-bacterial performance is good, the service life of the glaze is prolonged, and the service life of the glaze is prolonged. The antibacterial rate on common bacteria such as escherichia coli and staphylococcus aureus can reach 95% or above, the raw materials are wide in source and meet the environment-friendly requirement, the conventional ball milling, forming, glazing and firing processes are adopted, industrial production is easy, the cost is low, and large-scale popularization of the product is facilitated.

The invention discloses a high-performance conductive adhesive doped with conductive nanoparticles, and belongs to the technical field of conductive adhesives. The high-performance conductive adhesive provided by the invention is prepared from the following raw materials in parts by weight: 50 to 100 parts of vinyl liquid silicone rubber, 100 to 400 parts of modified silver coated copper powder, 1 to 10 parts of nano silver powder I, 1 to 10 parts of epoxy silane modified prepolymer, 3 to 30 parts of hydrogen-containing silicone oil, 0.1 to 5 parts of platinum catalyst and 0.05 to 1 part of inhibitor. The silver-coated copper powder and the epoxy silane are modified, so that the conductivity and the binding power of the conductive adhesive are greatly improved, and the epoxy silane modified prepolymer can form strong covalent bond combination with the surface of an adhered object through a high-density epoxy group of the epoxy silane modified prepolymer; the nano-silver bulges on the surface of the modified silver coated copper powder increase the effective contact area and the number of contact points among the conductive filler particles, so that the conductive adhesive has the characteristics of high conductivity, low resistance, high adhesive strength and strong toughness.

The invention discloses weldable low-temperature sintered silver paste which is prepared by mixing 65-90 parts of micro-nano silver powder, 10-20 parts of metal salt additive, 1-5 parts of polymer additive, 15-19 parts of organic solvent and 1-5 parts of organic additive, the micro-nano silver powder is obtained by mixing nano silver powder with the particle size of 10-50nm and micron silver powder with the particle size of 1-10mu m, and a preparation method comprises the following steps: step 1, preparing a first-stage polymer carrier; the preparation method comprises the following steps: 1, preparing a first-stage polymer carrier, 2, preparing a second-stage polymer carrier, 3, pretreating micro-nano silver powder, and 4, preparing conductive silver paste. Through micro-nano silver powder grading, nano-particles are filled in gaps of micro-particles, the stacking density is improved, the sheet resistance is reduced, an oxidation film is formed on the surface of the passivated micro-nano silver powder, the interface bonding strength can be effectively improved, the sintering activation energy of silver is reduced by the metal salt additive, and by combining the'etching-remelting 'effect of the oxidation film on the surface of the silver powder, the bonding strength of the surface of the silver powder is improved. The sintering temperature is effectively reduced.

The invention discloses a preparation method of a high-barrier aluminum oxide composite film for food packaging, and relates to the technical field of food packaging materials. The high-barrier aluminum oxide composite film for food packaging comprises the following raw materials in parts by weight: a barrier layer: 60-90 parts of modified nano aluminum oxide and 20-30 parts of a silane coupling agent KH-560; the functional layer is prepared from the following components in parts by weight: 18 to 28 parts of nano silver, 16 to 22 parts of compound antioxidant and 4 to 10 parts of nano titanium dioxide; the heat sealing layer is prepared from 22 to 32 parts of modified polylactic acid, 2 to 6 parts of graphene quantum dots, 12 to 16 parts of methyl methacrylate-butadiene-styrene copolymer, 3 to 6 parts of dodecyl trimethyl ammonium chloride, 10 to 14 parts of resorcinol tetraphenyl diphosphate and 7 to 17 parts of stearic acid intercalation modified nano montmorillonite. The high-barrier aluminum oxide composite film for food packaging is prepared by modifying nano aluminum oxide and polylactic acid, the barrier ability to gas, water vapor and ultraviolet rays is greatly improved, and the high-barrier aluminum oxide composite film is oil-resistant and antistatic. The product is high in mechanical strength, high in processing adaptability, capable of adapting to complex scenes, environment-friendly and safe.

The invention belongs to the technical field of antibiosis, and discloses a photodynamic antibacterial modified polyester fiber and a preparation method thereof.The preparation method comprises the steps that 1, SIPM serves as a surfactant, water-soluble silver salt serves as a precursor, ascorbic acid serves as a reducing agent, and water-soluble nano-silver powder is prepared; (2) after PTA and EG are subjected to esterification reaction, EG, SIPM and water-soluble nano-silver powder are added for polymerization reaction, and the photoresponse active material is obtained; (3) preparing the nano-silver antibacterial master batch by taking ECDP as a base material of the nano-silver antibacterial master batch and a photoresponse active material as an additive; and (4) carrying out melt blending on the modified polyester, a water-soluble pore-foaming agent and the nano-silver antibacterial master batch to obtain a spinning melt, spinning the spinning melt, and washing with water to obtain the photodynamic antibacterial modified polyester fiber. The photodynamic antibacterial modified polyester fiber disclosed by the invention has excellent antibacterial and antiviral properties.

The application discloses a preparation method of a flexible super-hydrophobic anti-icing coating and relates to the technical field of super-hydrophobic materials.The preparation method comprises the following steps: preparing nano-silver loaded multi-layer graphene; mixing PVP solution and multi-layer graphene suspension uniformly, adding glucose, stirring uniformly, adding silver-ammonia solution to react when the suspension reaches a set temperature, centrifugally separating after the reaction is completed, obtaining the nano-silver loaded multi-layer graphene product, cleaning by using pure water or ethanol, and drying in an oven for standby; and preparing a flexible super-hydrophobic layer; smearing a mixture of PDMS and a PDMS curing agent on the surface of a glass sheet, uniformly spraying nano-loaded multi-layer graphene powder to the surface of the mixture of uncured PDMS and the PDMS curing agent by using an airbrush, and placing in an oven for curing to obtain the flexible super-hydrophobic anti-icing coating.The preparation method is simple and environment-friendly, can be used on a large scale, and can solve the problems of anti-icing and deicing on various surfaces.

The present application relates to the technical field of bacteriostatic impregnated paper preparation, and discloses a bacteriostatic impregnated paper and a preparation method thereof, wherein a melamine impregnated paper substrate is impregnated with an impregnating solution; a rate regulating coating is coated on the surface of the substrate, so that the release rate of the bacteriostatic component is regulated according to the change of environmental pH value; wherein the surface of the rate regulating coating is further coated with a nano-silver particle layer, and the components of the impregnating solution include the following raw materials in percentage by weight: tea tree oil 0.5-2%, cinnamaldehyde 1-3%, lemon essential oil 0.5-1%, ethanol 70-80% and water; the present application provides a multi-layer protection mechanism, which can not only effectively kill various bacteria and fungi, but also prolong the duration of the bacteriostatic effect; the presence of the nano-silver particle layer enhances the long-term bacteriostatic effect, and even after long-term use, the high-efficiency antibacterial performance can be maintained; the introduction of the pH-sensitive polymer coating enables the release rate of the bacteriostatic component to be automatically regulated according to the change of environmental pH value.

The invention discloses a super absorbent material and side leakage prevention paper diapers, and belongs to the field of hygienic product materials. Comprising the following steps: cooling acrylic acid in an ice-water bath, and partially neutralizing the acrylic acid by using a sodium hydroxide solution; mixing potato starch with deionized water, and gelatinizing at high temperature to obtain gelatinized starch; mixing gelatinized starch, neutralized acrylic acid, potassium persulfate and deionized water; uniformly stirring under the protection of nitrogen, heating and carrying out graft copolymerization reaction to obtain a copolymer; adding modified silicon dioxide into the copolymer, and uniformly dispersing; then adding an oxetane compound, and carrying out a cross-linking reaction at a high temperature to obtain a super absorbent material; wherein the modified silicon dioxide has a porous structure, and nano-silver particles are loaded in pore walls. The super absorbent material disclosed by the invention effectively breaks through the gel blocking effect of the traditional high-molecular water-absorbent resin, has ultrahigh liquid absorption capacity and water locking capacity, and realizes slow-release long-acting bacteriostasis at the same time.

The invention relates to the technical field of high-performance acrylic fibers, and discloses an anti-wrinkle and anti-pilling homewear fabric and a preparation method thereof. The preparation method of the anti-wrinkle and anti-pilling homewear fabric comprises the following steps: preparing lignin micro-nanospheres, and modifying the lignin micro-nanospheres to obtain surface modified lignin micro-nanospheres; after the surface-modified lignin micro-nanospheres are modified by a modifier, nano-silver is deposited on the surfaces of the surface-modified lignin micro-nanospheres to obtain antibacterial modified lignin micro-nanospheres; loading the antibacterial modified lignin micro-nanospheres on the surface modified acrylic fibers to obtain loaded modified acrylic fibers; blending and knitting the loaded modified acrylic fibers and cotton fibers to obtain base cloth; and padding and baking the base cloth in the polyurethane anti-wrinkle and anti-pilling finishing liquid to obtain the anti-wrinkle and anti-pilling homewear fabric. The anti-wrinkle and anti-pilling homewear fabric has the advantages of being skin-friendly, warm-keeping, moisture-absorbing, breathable, anti-pilling, anti-wrinkle, washable and durable in antibiosis.

The application discloses a kind of microscale single particle quantitative analysis method and system based on nano-silver signal enhancement, it is related to spectral analysis technical field, the method includes: using laser-induced breakdown spectroscopy system to the carbon black particle target sample is carried out spectral data acquisition, obtains target full spectrum data and is pretreated, and then obtains target spectral data matrix;Variable importance measurement algorithm and continuous projection algorithm are used to the variable in the target spectral data matrix is screened, and target variable is obtained;Target variable is input into carbon black particle metal content prediction model, and the content of metal element in carbon black particle target sample is obtained.The application can quickly and accurately determine the content of metal element in carbon black particle target sample.

The invention relates to a lead-free and halogen-free soldering paste and a preparation process thereof, and belongs to the technical field of soldering paste production, through the combination of nano-silver-loaded carbon nanotubes, organically coated solder alloy powder and soldering flux, the surface tension of the lead-free and halogen-free soldering paste can be reduced by carbon nanotube surface carboxyl in the nano-silver-loaded carbon nanotubes, so that the lead-free and halogen-free soldering paste is obtained. Nano-silver and tin form an Ag3Sn strengthening phase which synergistically promotes wetting and spreading of the solder on a substrate, meanwhile, the carbon nanotubes loaded with the nano-silver are uniformly dispersed in the soldering paste to play a dispersion strengthening role, and the brittleness caused by bismuth segregation is effectively inhibited in cooperation with the grain refinement effect of copper and indium in the solder alloy powder; and the organic coating layer hydrogenated rosin-terpene resin and the soldering flux alcohol ether solvent form a slight dissolution-fusion effect, so that the welding flux alloy powder is prevented from being oxidized, an organic acid active agent can be released to remove a substrate oxidation film, the metallurgical bonding quality of a welding interface is further guaranteed, and the defects of pseudo soldering, cavities and the like are reduced.

The invention relates to the technical field of food packaging, in particular to a bacteriostatic aluminum foil material for a meal box and a preparation method thereof. The material is subjected to aluminum foil surface activation, then is sequentially impregnated in a sol impregnation liquid and an outer layer coating liquid, is subjected to dip coating, and finally is subjected to ultraviolet curing to obtain a multi-layer composite structure. The middle layer is made of an aminated organic silicon material and is firmly combined with the aluminum base material and the outer layer resin through chemical bonds, so that the adhesive force of the coating is remarkably improved. The outer coating is added with a phenyl triazole modified layered double hydroxide loaded nano-silver antibacterial agent, so that slow release and efficient broad-spectrum antibacterial property of silver ions are realized, the thermal stability is improved, and reliable performance under a high-temperature condition is ensured. The multilayer design and multiple antibacterial mechanisms have a synergistic effect, the problems of poor antibacterial durability, insufficient adhesive force, low heat resistance and the like of a traditional lunch box aluminum foil material are effectively solved, meanwhile, food safety is considered, and the aluminum foil material is suitable for the field of modern high-requirement food packaging.

The invention relates to the technical field of water purifiers, in particular to a filter element, a preparation method of the filter element and a water purifying device.The filter element comprises a silica sand layer, an activated carbon adsorption layer and a modified nano-silver functional layer which are stacked in the water flow direction; wherein the modified nano-silver functional layer comprises nano-silver particles modified by antibacterial peptide-cyclodextrin. According to the filter element prepared through the method, a superfine and dispersed nano-silver particle system is constructed, the stability of nano-silver in the filter element system can be greatly enhanced, then the antibacterial activity and antibacterial broad-spectrum performance of the nano-silver are improved, meanwhile, efficient removal of heavy metal is achieved in an auxiliary mode, and the water purification efficiency of a water purification device is effectively and comprehensively improved.

The invention discloses a low-thermal-resistance high-thermal-conductivity liquid metal heat-conducting sheet and a preparation method thereof, and relates to the technical field of heat-conducting materials. The nano silver wire network layers are formed on the front surface and the back surface of the liquid metal base material layer; the low-hardness heat-conducting curing layer is filled in pores of the silver nanowire network layer; and the silver nanowire network layer and the low-hardness heat-conducting curing layer jointly form the composite heat-conducting nano coating. The preparation method comprises the following steps: rolling liquid metal into sheets; coating the front side and the back side of the liquid metal sheet with the silver nanowire dispersion liquid respectively; after the coating is dried, performing vacuum hot pressing; and coating the silver nanowire network structure with a low-hardness heat-conducting coating, and carrying out vacuum curing to form a film. According to the invention, the defects in the prior art are overcome, the high heat conductivity coefficient of the composite coating can be ensured, the micro-nano interface between the interfaces can be filled by virtue of the low-hardness coating, and the interface thermal resistance is greatly reduced.

The invention relates to the field of textiles, and particularly discloses a preparation process of antibacterial fibers, which comprises the following steps: S1, respectively drying and preparing polymer slices and an antibacterial agent; s2, performing melt spinning on the polymer slices and an antibacterial agent, performing air cooling, and then performing traction and winding to obtain antibacterial fibers; wherein the antibacterial agent is prepared by mixing dodecyl trimethyl ammonium chloride, polyvinylpyrrolidone and core-shell type antibacterial particles according to the mass ratio of (0.4-0.5): (0.1-0.2): 1, the core-shell type antibacterial particles are prepared by loading nano-zinc oxide and nano-silver particles on intercalation modified montmorillonite and then forming a silicon dioxide coating layer through a sol-gel method, and the core-shell type antibacterial particles are prepared from the silicon dioxide coating layer through a sol-gel method. And carrying out spray drying to obtain the core-shell antibacterial particles. The preparation method has the characteristic of improving the antibacterial durability and uniformity of the antibacterial fiber.

The invention relates to the technical field of nano-composite water-based resin system design and function coordinated regulation and control, in particular to environment-friendly high-gloss wear-resistant water-based epoxy floor paint and a preparation method thereof. The environment-friendly high-gloss wear-resistant water-based epoxy floor paint is prepared from self-emulsifying water-based epoxy resin emulsion, a modified water-based epoxy curing agent containing biguanidyl and the like; the preparation method comprises the following steps: carrying out synergistic modification on a three-dimensional composite wear-resistant filler containing nano silicon dioxide-carbon nanotube-graphene through a silane coupling agent and dopamine; the light response type composite light stabilizer is compounded by a titanium dioxide grafted hindered amine light stabilizer and a benzophenone light stabilizer; a phase change temperature adjusting microcapsule and a nano-silver-chitosan antibacterial agent can also be added, so that multiple functions are realized. According to the floor paint disclosed by the invention, through an innovative formula and process, wear resistance, luster and weather resistance are remarkably improved, and toughness and crack resistance are enhanced; and the preparation method is environment-friendly and efficient, meets the requirements of multiple scenes, and has high economic value.

The invention is suitable for the technical field of heat dissipation of high-power electronic devices, and provides a copper-diamond-copper sandwich structure water-cooling radiator and a preparation method thereof.The main body structure of the water-cooling radiator is of a sandwich structure, the upper layer is copper, the middle layer is an MPCVD diamond polycrystalline or single crystal material, and the lower layer is copper; furthermore, the lower-layer copper can be of a special water cooling channel structure, and the purpose of liquid cooling heat dissipation is achieved. The middle diamond layer plays a role in rapidly guiding out heat of the chip, and the heat is taken away by the water cooling channel for heat dissipation. And the surface layer copper is convenient for processing during chip packaging. The sandwich structure is achieved through the AMB active brazing technology, the slurry of the middle layer is the nano-silver active solder, low-temperature brazing is achieved, the high-temperature thermal cycle reliability after welding is met, the technology has high application value, and powerful support is provided for next-generation water cooling heat dissipation.

The invention discloses an antibacterial wood coating based on water-based macromolecule combination. The antibacterial wood coating comprises the following components: a water-based macromolecule matrix, nano-silver particles, nano-copper particles, nano-titanium dioxide, a propolis extract, a dispersing agent, a surfactant, an antioxidant, an organic silicon compound, an ultraviolet light absorber, sodium polyacrylate, a cross-linking agent and deionized water. According to the antibacterial wood coating based on water-based macromolecule combination, the technical problems of stability, antibacterial effect, environmental friendliness, multifunctionality and the like of the antibacterial wood coating are solved, and an efficient, lasting and environment-friendly solution is provided.

The invention relates to the field of biological materials and nanotechnology, and discloses a nano lignin-based hydrogel preparation method which comprises the following steps: S1, pretreating more than 15% of lignin-rich cellulose biomass raw materials by using a choline chloride-lactic acid deep eutectic solvent to prepare nano lignin particles; s2, the nano lignin particles are mixed with silver nitrate and sodium hydroxide, and lignin-silver nano particles are synthesized through an oxidation-reduction reaction; s3, adding the lignin-silver nanoparticles into a polyvinyl alcohol solution, and mixing to form a mixture; and S4, carrying out freezing-thawing cycle induced physical crosslinking on the mixture to form the nano composite hydrogel. By forming a compact porous network, the hydrogel not only has good mechanical properties (the tensile strength reaches 0.7-0.9 MPa), but also has good toughness and ductility (1.0-1.3 MJ.m <-3 >) and excellent pressure sensitivity (the pressure sensitivity is 2.5-2.7 kPa <-1 >).

The invention discloses a gel microneedle loaded with silver nanoparticles and a preparation method and application thereof.The extract nano-silver (AB-AgNPs) is prepared through a green synthesis strategy, a drug-loaded microneedle system is constructed based on carboxymethyl chitosan-vanillic aldehyde-polyvinyl alcohol (CMCS-Va-PVA) composite gel, the AB-AgNPs prepared through the technology are uniform in particle size and stable in dispersion, and the drug-loaded microneedle has the advantages that the drug-loaded microneedle is good in drug-loaded performance and good in drug-loaded performance; the crystal has a typical face-centered cubic crystal structure and metal state Ag0 characteristics; the gel microneedle has good mechanical strength and forming effect, the AB-AgNPs and the gel matrix are stably combined through hydrogen bonds, the chemical properties are kept unchanged, and the system has broad-spectrum efficient bacteriostatic activity and biocompatibility; an in-vitro experiment proves that the green synthesized gel microneedle loaded with the silver nanoparticles has a remarkable capability of promoting the healing of L929 cell tissues; a rat wound experiment proves that the gel microneedle can regulate and control an inflammatory factor network and promote cell migration and tissue regeneration, healing of common and infected wounds is remarkably accelerated, and the wound residue ratio in 9 days is as low as 2.7% and 10.9% respectively.

The invention relates to the technical field of flexible bioelectronics and biomedical sensors, in particular to a biocompatible flexible carbon-based physiological electrode prepared through coaxial spinning and application of the biocompatible flexible carbon-based physiological electrode. The conductive core is formed by crosslinking graphene oxide, carbon nanotubes and the like; the buffer layer contains polyurethane and the like, and shape memory microspheres and antibacterial nano-silver are added; a biological interface layer contains chitosan and the like, and PEG-PE is grafted to reduce protein adsorption; the thickness ratio of the three layers is 1: (1.5-2): (0.5-1), and the thickness is 100-300 microns; the electrode has conductive, sensing and antibacterial functions, can load double enzymes for blood glucose monitoring, is strong in interlayer bonding, and is suitable for various biomedical scenes. By innovating the three-layer structure and the material design, high conductivity, high flexibility and excellent biocompatibility are achieved; multi-parameter monitoring and electrical stimulation treatment can be achieved, the anti-bending performance is good, the antibacterial and anticoagulant effects are good, the preparation process is controllable, and the application prospects in the fields of wearable equipment, implantation medical treatment and the like are wide.

The invention discloses a pH / temperature dual-response type quaternary ammonium salt-nano silver-zinc oxide composite antibacterial coating material as well as a preparation method and application thereof, and belongs to the technical field of antibacterial materials. The antibacterial effective life of the coated product is at least up to 5 years. The coating product is preferably a gastrointestinal endoscope, efficient bacteriostasis is achieved under the condition that the light transmittance of the gastrointestinal endoscope is not affected, biocompatibility is good, safety is high, precise controlled release of silver ions is achieved, and biotoxicity caused by sudden release of the silver ions is avoided. The quaternary ammonium salt-nano silver-zinc oxide composite coating material with the pH / temperature dual-response antibacterial effect is finally obtained through the steps of preparing a composite carrier material, loading antibacterial metal elements, constructing a pH / temperature dual-response polymer network and the like in sequence. A high-performance, safe and environment-friendly antibacterial coating system which is rapid in sterilization, precise in controlled release and long-acting in interference resistance is constructed, and an antibacterial solution with high technical adaptability is provided for the fields of medical treatment, food, water treatment and the like.

The invention provides high-stability double-layer core-shell coated pure copper silver-substituted conductive paste and a preparation method thereof, and belongs to the technical field of electronic special materials. The copper-resistant coating comprises the following components in percentage by mass: 82%-90% of antioxidant copper powder with a double-layer core-shell structure, 3%-6% of bismuth-boron-zinc lead-free low-melting-point glass powder, 3%-7% of a modified epoxy resin compound organic carrier, 2%-5% of a gradient volatilization compound solvent and 0.5%-2% of a special compound additive for copper. Through the double-layer core-shell copper powder design of inner-layer nano-silver passivation and outer-layer organic composite coating and in cooperation with a liquid-phase synergistic anti-oxidation system, the volume resistivity after slurry curing is smaller than or equal to 3.5 * 10 <-5 > omega.cm, the resistivity change rate after 1000-hour damp-heat aging at 85 DEG C / 85% RH is smaller than or equal to 10%, the normal-temperature storage period without opening a tank is larger than or equal to 6 months, direct curing can be conducted in the conventional air atmosphere of 120-160 DEG C, and the high-temperature-resistant copper paste can be applied to the field of high-temperature storage. The silver paste is completely compatible with production and application production lines of existing silver paste, equipment transformation is not needed, the comprehensive cost is reduced by more than 80% compared with pure silver paste, and the silver paste can be widely applied to the fields of PCBs, membrane switches, flexible electronics, photovoltaic back electrodes, LED packaging and the like.

The invention belongs to the technical field of sensor materials and malathion detection, and relates to a nano-silver modified covalent organic framework composite material, a preparation method and application thereof, and an electrochemical aptamer sensor. The preparation method comprises the following steps: S1, dissolving 1, 3, 5-tri (4-aminophenyl) benzene and 2, 5-divinyl-1, 4-phthalaldehyde in acetonitrile, adding a catalyst to carry out condensation reaction, standing, separating, washing and drying to obtain a covalent organic framework material; s2, dispersing the covalent organic framework material and silver nitrate in water, adding sodium citrate after ultrasonic dispersion, and washing and drying to obtain the nano-silver modified covalent organic framework composite material. The nano-silver modified covalent organic framework composite material prepared by the invention shows excellent crystallinity, extremely high porosity and good conductivity, and realizes high-sensitivity, rapid and accurate quantitative analysis of malathion in traditional Chinese medicinal materials.

The invention provides antibacterial silicone rubber and a preparation method thereof, and belongs to the technical field of rubber materials. The antibacterial silicone rubber comprises the following components in parts by weight: 80-100 parts of a silicone rubber matrix, 10-20 parts of a nano-composite antibacterial agent, 1-3 parts of a cross-linking agent, 0.5-2 parts of a stabilizer and 5-15 parts of a filler. The nano-composite antibacterial agent has the characteristics of synergistic antibacterial property of nano-silver and quaternary ammonium salt, reinforcing and toughening property of SiO2, long-acting precipitation resistance and the like, so that the prepared silicone rubber can be widely applied to the fields of medical treatment, food, electronics and the like with high requirements on antibacterial durability.