1531 results about "Silver Nano" patented technology

The invention belongs to the technical field of metal powder preparation, and discloses a method for preparing silver powder through reduction of hydrazine hydrate with the adjustable particle size. The preparation method comprises the following steps that a first dispersing agent is dissolved in deionized water, a silver-ammonia solution and a hydrazine hydrate solution are sequentially added, stirring reaction is conducted, and nano-silver seed crystal sol is obtained; uniformly mixing the obtained nano-silver seed crystal sol with a hydrazine hydrate solution and a second dispersing agent to obtain a reducing base solution; adding a surface modifier into absolute ethyl alcohol, and uniformly dissolving to obtain a surface modification coating solution; preparing a silver-ammonia solution, adding the prepared silver-ammonia solution into the reducing base solution, then adding the surface modification coating solution, and stirring for reaction to obtain silver powder slurry liquid; and after solid-liquid separation, a solid phase is taken, washed and dried, and silver powder is obtained. The preparation method is simple in process, the particle size of the silver powder can be adjusted through the adding amount of the seed crystal, and the prepared silver powder particles are uniform in particle size distribution, high in dispersity and suitable for the fields of conductive silver paste, electronic packaging and the like.

The invention provides conductive paste for a heterojunction solar cell and a preparation method of the conductive paste, and belongs to the field of conductive paste. The spherical nano-silver, the silver nanowires and the silver nanosheets are introduced, a three-dimensional conductive network is formed through three metal shapes, the conductivity of the paste is remarkably improved, high stability is kept in long-term use through the synergistic effect, and degradation of the conductivity is avoided; the carbon nanotubes are modified through mixed acid and a coupling agent, so that the dispersity is improved, the interface bonding force is enhanced, and the conductivity and mechanical strength of the slurry are improved; according to the graphene, the dispersity and compatibility are improved through introduction of sulfydryl, and the conductivity is restored through reduction of sodium borohydride; silver-coated silicon carbide is used as a filler to improve conductivity, retain hardness of silicon carbide, enhance wear resistance of the slurry and prolong service life; through the synergistic effect of the modified carbon nanotubes, the modified graphene and the silver-coated silicon carbide, the paste shows excellent performance in the aspects of conductivity, thermal stability and mechanical strength.

The invention relates to the field of building materials, and discloses a multifunctional foamed ceramic sound insulation and heat preservation material for buildings. Comprising the following raw materials in parts by weight: 42 to 48 parts of pottery clay tailings, 14 to 16 parts of fly ash, 10.5 to 12 parts of crushed stone materials, 2.8 to 3.2 parts of a silicon carbide foaming agent, 0.7 to 0.8 part of a borax fluxing agent, 7 to 8 parts of paraffin / silicon dioxide phase change microcapsules, 0.5 to 1.0 part of graphene, 2.0 to 2.5 parts of nano iron powder, 0.05 to 0.5 part of nano silver, 1.0 to 1.5 parts of photocatalytic titanium dioxide and 0.3 to 0.4 part of a fluorosilane coupling agent. A stable matrix structure is constructed through the argil tailings, the fly ash and the crushed stone materials, the silicon carbide foaming agent and the borax fluxing agent reduce the heat conductivity coefficient, the sound insulation performance is improved, the material is endowed with the antibacterial ability through nano-silver and photocatalytic titanium dioxide, indoor sanitation is guaranteed, and a super-hydrophobic layer is constructed through the fluorosilane coupling agent.

The invention discloses a low-temperature silver-coated copper conductive silver paste suitable for heterojunction solar cell nickel screen printing, which comprises the following components in percentage by mass: 10-70% of spherical silver-coated copper powder, 15-80% of submicron silver powder, 0.5-5% of nano silver powder, 1-6% of resin, 0.2-4% of assistant and 0.5-3% of solvent, wherein the resin comprises epoxy resin with the epoxy equivalent of 200 to 260 and rubber toughened epoxy resin with the weight-average molecular weight of 10000 to 20000. Wherein the epoxy resin with the epoxy equivalent of 200-260 provides ink passing performance, and nickel net narrow line width printing is guaranteed; the high-molecular-weight resin with the weight-average molecular weight of 10000-20000 is used as the thixotropic agent, so that the printing line type and the height-width ratio are ensured. The line width of a heterojunction battery prepared by matching the slurry with nickel net narrow line width printing can be as low as 18 microns, and the conversion efficiency of a battery piece is improved on the basis of greatly reducing the silver consumption of a single piece.

The invention discloses a gynecological antibacterial gel containing a carbomer component, and belongs to the technical field of gynecological nursing materials. The gel is prepared from 0.5 to 5 percent of plant extract microcapsules, 0.5 to 3 percent of carbomer, 2 to 10 percent of glycerol, 0.1 to 1.5 percent of triethanol and the balance of purified water. The plant extract microcapsule is prepared by compounding methacrylated silk fibroin and a caffeic acid hyaluronic acid graft, has temperature responsiveness, can improve the adhesive force on the surface of vaginal mucosa, and realizes slow release of the plant extract; the caffeic acid catechol hydroxyl is chelated with silver ions, a nano-silver monodisperse layer is formed on the surface of the microcapsule, and the antibacterial activity is improved. The composite plant extract can inhibit bacteria, repair mucous membranes and maintain the acidic microenvironment of the vagina. When the gel is prepared, the problem that the swelling efficiency of carbomer is low is solved through glycerol pre-grinding, and triethanolamine is added in three times to form a gradient cross-linked network. The problems that traditional gel is unstable in viscosity, poor in mucous membrane adhesiveness and prone to damaging vagina micro-ecology are solved, the antibacterial effect is good, and preservation is stable.

The invention relates to the technical field of printing materials, in particular to a 3D printing material, a preparation method and application of the 3D printing material in shoe materials, and the 3D printing material comprises the following raw materials in parts by weight: 35-40 parts of TPU, 10-15 parts of polycaprolactone, 6-9 parts of nano silver powder, 3-5 parts of a compatilizer, 3-4 parts of a foaming agent, 2-3 parts of a foam stabilizer, 1-3 parts of a lubricant and 1-3 parts of an antioxidant. According to the 3D printing material disclosed by the invention, TPU is matched with polycaprolactone, functional aids such as a compatilizer, a lubricant and an antioxidant are added, nano silver powder is added to optimize the antibacterial property of a product, and meanwhile, the added carbon nano tube is blended with a nano attapulgite agent and a supplementing agent for supplementing and adjusting a modified filler to be mutually blended and matched, so that the obtained 3D printing material optimizes the raw material agglomeration property; the antibacterial property, the wear resistance and the mechanical tensile property of the product are improved in a balanced and coordinated manner, and the weather-proof and washing-resistant stability effects of the product are remarkable.

The invention discloses a packaging bag with high sealing performance and a preparation process thereof, and belongs to the technical field of packaging materials, the packaging bag comprises the following raw materials: polylactic acid, polycaprolactone, a nano-silver filler composite antibacterial agent and an epoxy compatilizer; the nano-silver filler composite antibacterial agent is formed by depositing a hybrid modified coating on the surface of a nano two-dimensional filler and then loading nano-silver; the hybrid modified coating is prepared from polydopamine and hyperbranched polyethyleneimine. The polylactic acid and the polycaprolactone are used as main base materials, and the packaging bag is endowed with good mechanical properties by utilizing high mechanical strength of the polylactic acid and excellent flexibility of the polycaprolactone; a nano-silver filler composite antibacterial agent and an epoxy compatibilizer are also added, the nano-silver filler composite antibacterial agent takes a nano-two-dimensional filler as a raw material, the nano-two-dimensional filler has a high length-diameter ratio and can block permeation of gas molecules, and the dispersion performance is improved by combining the nano-two-dimensional filler with the epoxy compatibilizer; the barrier property and the mechanical property of the packaging bag are further improved.

The invention discloses a high-strength nano composite stiffening filling master batch and a preparation method thereof, and relates to the technical field of high polymer materials, the raw materials comprise a nano filler, a matrix material and a functional additive; the nano filler comprises nano diamond, nano silicon carbide and bio-based nano cellulose, the base material comprises polyimide, polyether-ether-ketone and bio-based polylactic acid, and the functional additive comprises a hindered phenol antioxidant, a nano aluminum hydroxide flame retardant, a nano silicon dioxide reinforcing agent, an ultraviolet light absorber, a carbon nano tube and nano silver particles. Nano-diamond, nano-silicon carbide and bio-based nano-cellulose are adopted as nano-fillers, polyimide, polyether-ether-ketone and bio-based polylactic acid are combined as base materials, and a plurality of functional additives are added, so that the preparation of the high-strength nano-composite stiffening filling master batch is realized; and the problems of poor dispersibility, mechanical property damage, insufficient hardness and poor interface bonding of the traditional filler master batch can be solved.

The invention discloses a radiation refrigeration coating and a preparation method thereof. The radiation refrigeration coating comprises a first filler and a second filler, the mass ratio of the first filler to the second filler is (1-3): (1-5), and the first filler comprises the following components in percentage by weight: 50-70% of a polyurethane emulsion, 10-15% of a silane coupling agent, 8-10% of multi-mesoporous nano-silica and 5-8% of talcum powder; the second filler comprises the following components in percentage by weight: 60%-70% of polyethylene glycol, 10%-15% of a dispersing agent and 5%-8% of nano barium oxide; 5%-8% of tannic acid; 3%-5% of nano silver; the viscosity of the polyurethane emulsion ranges from 300 cps to 800 cps. The radiation refrigeration coating disclosed by the invention has the advantages that a refrigeration film has larger infrared radiation refrigeration capacity in an atmospheric window, better ultraviolet light absorption capacity and long service life.

The invention relates to the technical field of nano silver powder preparation, in particular to a preparation method of high-tap-density and high-purity silver powder. The problems that in the prior art, silver powder is insufficient in purity and low in tap density are solved. The method comprises the following steps: preparing silver nitrate into a solution, carrying out electrolytic pretreatment, and carrying out chemical reduction, coprecipitation and dissolution reduction to obtain a silver powder suspension; the silver powder suspension is subjected to physical vapor deposition, silver vapor is deposited on the surface of the silver powder under the action of argon, and silver powder particles are tightly arranged; preparing an electrolyte from silver nitrate and bismuth nitrate, and carrying out electrolytic refining; and finally, the high-tap-density high-purity silver powder is obtained through ultrasonic dispersion and supercritical fluid drying treatment. By strictly controlling the process sequence and parameters and utilizing the synergistic effect among the processes, impurities are effectively removed, the particle size distribution of nano silver powder particles is optimized, the purity and tap density of the nano silver powder are improved, and the application of the silver powder in conductive materials is optimized.

The invention relates to the field of chip mounters, and discloses a nano-silver pre-sintering chip mounter which comprises a rack, a base material conveying device, a chip mounting head device, a heating sintering chip mounting platform, a crystal ring feeding device and a TRAY disc feeding device, the chip mounting head device is erected on the rack, the base material conveying device is arranged on the lower side of the chip mounting head device, the heating sintering chip mounting platform is arranged on the lower side of the chip mounting head device, and the TRAY disc feeding device is arranged on the lower side of the chip mounting head device. The heating platform is arranged in front of the base material conveying device; the wafer ring feeding device is arranged on the right side of the front end of the machine frame, the TRAY disc feeding device is arranged on the left side of the front end of the machine frame, components can be accurately mounted on a circuit board or other carriers, the mounting requirements of most of products in the market are met, the structure is more compact, the mounting efficiency is higher, and the mounting precision is higher.

The invention discloses a preparation method and application of composite nanoparticles with a gold-silver core-shell structure, and aims to solve the problems that silver halide precipitates are generated on the surface of a silver core and the silver core is etched in the prior art. The thiourea solution is used for replacing a halogen-containing reagent, uniform epitaxial growth of gold on the surface of the silver core is mildly achieved, the gold-shell silver-core nanoparticles which are evenly wrapped and stable in structure are prepared, and the gold-shell silver-core nanoparticles are suitable for the fields of immunodetection and the like and are good in color development effect and low in cost. The method comprises the steps of preparing a gold salt solution, preparing gold nano-seeds, preparing silver nano-cores and generating gold-shell silver-core nano-particles through a chemical reduction reaction, and the problem that a core-shell structure grows unevenly is solved. When the method is applied to immunodetection, the material cost can be remarkably reduced, and a better color development effect can be achieved.

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 belongs to the technical field of external medicine compositions, and particularly relates to microsphere type antibacterial gel as well as a preparation method and application thereof. The preparation comprises three parts, namely dextran microspheres wrapped by polyethylene glycol, a mixed antibacterial component and a carbomer mixed solution. The mixed antibacterial component is prepared from thymol, chlorhexidine acetate, cinnamyl aldehyde, citral, gallic acid and nano silver. Glucan is prepared into microspheres by utilizing a micro-fluidic chip technology, antibacterial components are wrapped in the microspheres, then the microspheres are compounded into the microsphere type antibacterial gel, and the gel not only shows excellent antibacterial performance and strong adhesive capacity, but also has a remarkable wound repair promoting effect; the microsphere structure can wrap and mix the antibacterial components and play a role in controlled release of the antibacterial components, so that a novel solution is provided for the medical field of antibacterial gel.

The invention discloses a core-shell structure nano calcium carbonate antibacterial composite powder and a preparation method thereof.The preparation method comprises the steps that firstly, the surface of nano calcium carbonate is coated with a layer of amorphous TiO2 to form a CaCO3 at-TiO2 core-shell structure, then CaCO3 at-TiO2 reacts with 3-isocyanate propyl trimethoxy silane to generate a Ti-O-Si chemical bond on the surface of the CaCO3 at-TiO2 core-shell structure, and the core-shell structure nano calcium carbonate antibacterial composite powder is obtained; finally, Ag < + > is adsorbed to the surface of CaCO3 (at) TiO2 under the electrostatic action of Si-OH and is reduced into nano silver under the action of sodium citrate, and the CaCO3 (at) TiO2 (at) Ag core-shell structure antibacterial composite powder which is uniform in coating and good in dispersity is formed. The core-shell structure antibacterial composite powder disclosed by the invention shows excellent antibacterial performance in an antibacterial test on escherichia coli and staphylococcus aureus. The method provided by the invention provides a new research thought for preparation of a nano calcium carbonate core-shell structure and a nano silver antibacterial agent.

The invention provides micron blocky and submicron spherical mixed silver powder and a preparation method thereof. The preparation method comprises the steps that firstly, a silver salt solution is prepared, a reducing agent, a dispersing agent and pure water are mixed to obtain a reducing agent solution, and nano-silver crystal suspension liquid and the dispersing agent are mixed to obtain a base solution; synchronously dropwise adding the silver salt solution and the reducing agent solution into the base solution to obtain a solution containing the mixed silver powder; and finally, the solution is subjected to washing, solid-liquid separation and drying and shaping treatment, and then the micron blocky and submicron spherical mixed silver powder is obtained. According to the preparation method, polyvinylpyrrolidone with low molecular weight is selected as a dispersing agent, and the adding process of the dispersing agent is controlled, so that nano-silver crystals and the dispersing agent play a synergistic role, the micron blocky and submicron spherical mixed silver powder with good dispersion uniformity and high tap density is obtained, and the mixed silver powder is better in stacking structure and high in conductivity after being formed into slurry; the preparation method provided by the invention simplifies the process steps, shortens the preparation time, and has industrial application prospects.

The invention discloses a preparation method of sphere-like submicron silver powder with a controllable particle size. The method comprises the following steps: 1, preparing a silver nitrate solution, an organic acid reducing agent solution and a dispersing agent solution; 2, preparing an organic acid salt reducing agent solution from a small amount of organic acid reducing agent solution, uniformly mixing the organic acid salt reducing agent solution with the polyacrylamide solution to form a base solution, and adding a small amount of silver nitrate solution to react to form nano-silver crystal nucleuses; 3, adding nitric acid and a dispersing agent solution, uniformly stirring, and then dropwise adding the residual organic acid reducing agent solution and the residual silver nitrate solution for silver crystal nucleus growth; and 4, washing and drying after solid-liquid separation. By controlling the adding mode of the reducing agent and the silver nitrate and reducing the silver nitrate in two steps, formation and growth of silver crystal nucleuses are controlled, regulation and control of the particle size of the sphere-like submicron silver powder are achieved, the sphere-like submicron silver narrow in particle size distribution, regular in morphology and good in dispersity is obtained, the preparation process is simple, green and environmentally friendly, and the method is suitable for industrial production. The method is suitable for heterojunction solar cells and high-end electronic devices.

The invention discloses a stainless steel material for a food-grade straw and a preparation process of the stainless steel material, and relates to the technical field of stainless steel material plating. The silver coating and the antibacterial coating are arranged on the surface of the stainless steel material, and the stainless steel material has good wear resistance and antibacterial performance through the action of the double protective layers. Sulfonated polyphenylene sulfide is added into a silver plating solution, a plating layer is formed after electroplating, the surface of a stainless steel material is not prone to being scratched, the wear resistance of stainless steel is improved, quaternary ammonium salt modified tea polyphenol-nano-silver composite particles are added into the antibacterial coating, and through the synergistic antibacterial effect of quaternary ammonium salt, tea polyphenol and nano-silver, the wear resistance of the stainless steel material is improved. The broad-spectrum antibacterial property is realized, and the efficient antibacterial effect is achieved.

The invention discloses a conductive microneedle patch for diabetes wound healing and a preparation method and application thereof, and belongs to the technical field of biomedical materials. The conductive microneedle patch is of a nesting doll type double-layer structure formed by an inner layer and an outer layer, microneedles on the inner layer are constructed through a methacrylic anhydride modified gelatin template pouring method, and polyvinyl alcohol microneedles on the top layer are formed by the outer layer through a lining-template pouring method. Wherein the microneedle patch has remarkable conductivity and antibacterial property due to a conductive nano-material silver nanowire in the inner-layer microneedle, and the outer-layer microneedle is loaded with a hypoglycemic drug and a natural humectant betaine, so that the properties of moisturizing and continuously releasing drugs are achieved. The obtained microneedle patch can keep a wound moist environment and adjust a diabetes wound inflammation microenvironment, cell and blood vessel growth is promoted through exogenous electrical stimulation, and rapid healing of a diabetes wound can be effectively achieved by releasing a hypoglycemic drug.

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 discloses a power-on viscosity-reducing adhesive tape and a preparation method and application thereof, and belongs to the technical field of processing of UV adhesive tapes for batteries, the preparation method comprises the following steps: mixing and stirring an acrylate pressure-sensitive adhesive, a UV prepolymer, composite conductive hydrogel, a curing agent, a photoinitiator, a solvent and a leveling agent to obtain conductive glue; and coating the conductive glue on the upper and lower surfaces of the aluminum foil substrate, drying at 80-100 DEG C for 5-6 minutes to obtain a conductive adhesive layer, and adhering release films on the upper and lower surfaces of the conductive adhesive layer to obtain the electrified viscosity-reducing adhesive tape. The synthesized porous carbon has high porosity, and promotes the manganese-doped nano zinc sulfide to emit light to initiate polymerization, crosslinking and curing of the conductive adhesive layer, so that the conductive adhesive layer loses viscosity; nano-silver particles are formed on the surface of the zinc oxide whisker loaded with the porous carbon, so that the pore structure of the porous carbon is refined, and the heat dissipation performance of the electrified viscosity-reducing adhesive tape is improved.

The invention belongs to the field of flexible electronic devices, and discloses a preparation method of a high-performance strain sensor based on a nano-silver nano-cellulose seepage network. According to the hydrogel, polyvinyl alcohol is used as a matrix, a seepage network formed by polydopamine anchored nano-silver / nano-cellulose PCNF is used as a conductive phase, glycerin is used as an anti-freezing humectant, and through the synergistic effect of a three-dimensional seepage conductive network and a dynamic hydrogen bond network, the defects that traditional hydrogel is poor in sensing stability, poor in environmental stability and low in mechanical strength are overcome. The preparation process is simple, the conductive hydrogel is high in tensile strength, high in sensitivity and good in cycling stability and has an antibacterial function, and an assembled strain sensor can monitor a human motion signal in real time and is suitable for the fields of wearable equipment, electronic skin and medical monitoring in an extreme environment. Through material system and process innovation, integration of high performance and multiple functions is achieved, and wide application prospects are achieved.

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 relates to the technical field of biomedical materials, in particular to a preparation method of in-situ biomineralized nano-silver loaded photo-thermal antibacterial casein hydrogel and application of the in-situ biomineralized nano-silver loaded photo-thermal antibacterial casein hydrogel in the field of biomedical materials. The invention discloses a preparation method of an antibacterial casein hydrogel precursor solution. The preparation method comprises the following steps: S1, preparing modified casein; and S2, preparing an antibacterial casein hydrogel precursor solution for in-situ synthesis of nano-silver. The antibacterial casein hydrogel precursor solution is irradiated under blue light (405 nm), and the antibacterial casein hydrogel is obtained and can be used as a gel type medical antibacterial material.

The invention relates to the technical field of biomedicine, and discloses a triclosan antibacterial coating surgical suture and a preparation method thereof.The suture comprises a base material and a surface antibacterial coating, the base material is selected from one of an absorbable single-strand material, an absorbable multi-strand material, a non-absorbable single-strand material and a non-absorbable multi-strand material, and the surface antibacterial coating is selected from one of an absorbable multi-strand material and a non-absorbable multi-strand material; the antibacterial coating comprises triclosan, a high-molecular carrier and an auxiliary agent, the surface energy of a hydrophobic material is improved, the porosity of a hydrophilic material is increased, the adhesive force between the coating and different base materials is ensured, the base materials can be covered, the uniformity deviation of the coating is avoided, and the coating is free of cracking or falling off through the combination of plasma cleaning and roughening treatment on the surface of the base materials. A synergistic system is formed by triclosan, nano-silver and titanium dioxide, a dual mechanism of targeted destruction of bacterial cell membranes and free radical oxidation is achieved, the antibacterial rate is increased, the MRSA inhibition rate is increased, the degradation rate is regulated and controlled through the polylactic acid-glycolic acid copolymer carrier molecular weight and the lactic acid / glycolic acid proportion, and a curing dynamic formula is combined.

The invention discloses a humidifying structure, an air conditioner applying the humidifying structure and an air conditioner control method, and belongs to the technical field of air conditioner humidifying, the humidifying structure comprises a wet film humidifier and a humidifying circulating mechanism arranged on the lower portion of the wet film humidifier, the humidifying circulating mechanism comprises a water storage tank, a top cover, a water pump and a water conveying pipe, and the interior of the water storage tank is connected with a blocking plate; the top of the water treatment tank body is provided with a downward concave-convex cambered-surface concave part, the center of the cambered-surface concave part is provided with a large notch part, and the water treatment tank body, the inner wall surface of the water outlet and the surface of the cambered-surface concave part are each coated with a nano-silver coating. Before the humidification structure releases water vapor for humidification into a room, water in the humidification structure can be subjected to surrounding type sterilization treatment, so that the number of bacteria released into a newborn ward of a hospital can be greatly reduced in the humidification process of the air conditioner, the sterile requirement of the newborn ward is met, and the health and safety of newborns are ensured.

The invention relates to a carbon dioxide electrocatalytic reduction catalyst, in particular to an L-cysteine modified nano-silver electrocatalyst and application thereof, and belongs to the technical field of carbon dioxide emission reduction and resource utilization and electrocatalytic material synthesis. A preparation method of the L-cysteine modified nano-silver electrocatalyst comprises the following steps: S1, dissolving silver nitrate in water to obtain a 0.05-100mM silver nitrate solution, adding the silver nitrate solution into ethylene glycol, and uniformly stirring; the volume ratio of the silver nitrate solution to the ethylene glycol is 1: (2-20); s2, L-cysteine is added into the mixed solution, microwave heating is performed after uniform stirring, obtained solids are centrifugally washed at least three times with ethyl alcohol and ultrapure water respectively, and the solids are dried in a vacuum drying box to obtain nano-silver particles; the molar ratio of the silver element to the L-cysteine is 1: (0.01-10). By improving the adsorption capacity of the electrocatalyst on active substances, high selectivity and high stability of the product CO in a CO2 in-situ conversion system are realized.

The invention relates to the technical field of comprehensive recovery and treatment of waste photovoltaic panels, in particular to a comprehensive utilization method and equipment for waste photovoltaic panels. The method comprises the following steps: step 1, dismantling the frame of the waste photovoltaic equipment: heating the waste photovoltaic panel to heat and soften an adhesive of the frame of the waste photovoltaic panel, and then carrying out nondestructive dismantling and briquetting; 2, the photovoltaic panel with the frame removed is conveyed to a pulverizer to be preliminarily pulverized; step 3, conveying the preliminarily crushed photovoltaic panel to a high-temperature decomposition machine, and performing decomposition under a high-temperature condition; and 4, the materials decomposed by the high-temperature decomposition machine are conveyed to a separation system to be separated, glass is separated out through a vibrating screen, and separation of silicon, copper and the nanometer silver wires is achieved through winnowing separation and electrostatic separation. According to the comprehensive recycling treatment method for the waste photovoltaic panels, efficient and automatic recycling treatment of the waste photovoltaic panels is achieved, the recycling efficiency is improved, and the recycling cost is reduced.

The invention relates to the field of coatings, and particularly discloses an antibacterial formaldehyde-removing art coating and a preparation method thereof. The art coating comprises the following components in parts by weight: 30-40 parts of a water-based acrylic emulsion; 0.3 to 1 part of nano silver; 1-3 parts of a formaldehyde removal agent; 2-4 parts of an auxiliary agent; 6-8 parts of a filler; 18 to 23 parts of titanium dioxide; 20 to 30 parts of water; a preparation process of the formaldehyde removal agent comprises the following steps: S1, bamboo powder preparation: bamboo wood is cleaned, sliced and crushed, and is sieved by a 50-mesh sieve to prepare the bamboo powder; s2, acidolysis; s3, alkali treatment; s4, preparing nano bamboo fibers; and S5, loading the bamboo fibers. The formaldehyde removal agent provided by the invention is of a functional composite type, on one hand, the formaldehyde removal agent has the functions of adsorption formaldehyde removal and reaction formaldehyde removal, the comprehensive formaldehyde removal effect is superior to that of traditional activated carbon, on the other hand, the formaldehyde removal agent has excellent formaldehyde removal performance in a formaldehyde high-speed release temperature interval of 30-40 DEG C, more formaldehyde can be discharged and absorbed, and the environmental protection requirement of high-end home decoration is met.