570 results about "Silver Nano" patented technology

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 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 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 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 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 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 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 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 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.

This disclosure provides a nano-silver powder and its preparation method, relating to the field of metal powder preparation technology. The preparation method of the nano-silver powder includes: dissolving a silver source in a first solvent to obtain a first solution with a concentration of 0.01M to 0.5M; dissolving a reducing agent, polyvinylpyrrolidone, and a polysaccharide-containing compound in a second solvent and adjusting the pH to 8 to 9 to obtain a second solution; adding the second solution dropwise to the first solution under stirring conditions at 15°C to 50°C, controlling the dropwise addition time between 30 min and 180 min to obtain a third solution; and sequentially subjecting the third solution to ultrasonic dispersion, centrifugal classification, washing, and drying to obtain the nano-silver powder. This disclosure can improve the quality of the nano-silver powder.

The invention relates to the technical field of resistance paste, and provides resistance paste and a preparation method thereof. Wherein the resistance paste comprises 75-105 parts of a conductive filler, 0.5-5 parts of a high-temperature heat-resistant agent, 5-15 parts of glass powder and 15-33 parts of an organic carrier; the conductive filler contains nano silver powder. According to the resistance paste provided by the invention, the added conductive filler serves as a core component of the resistance paste and is used for forming a continuous and compact conductive network, and the contained nano silver powder can remarkably reduce the sintering temperature of the resistance paste, promote the sintering compactness and enhance the adhesive force, so that the stability and reliability of a resistor are improved; the high-temperature heat-resistant agent has an extremely high heat-resistant temperature, so that the heat stability, the service life and the reliability of the resistor can be remarkably improved; the glass powder can improve the compatibility of the slurry and a base material, effectively prevents cracking and layering caused by sintering, and can form a more compact protection layer, thereby inhibiting silver oxidation and improving the corrosion resistance of the resistor.

The invention belongs to the field of antibiotic analysis and detection, and discloses a quinolone drug SERS (Surface Enhanced Raman Scattering) detection method based on an improved silver nano-substrate and a spectral angle matching model. An improved Lee-Meisel method is adopted to synthesize silver nano sol with precisely controlled particle size, molecular adsorption is realized by utilizing electrostatic interaction of a positively charged quinolone drug and negatively charged silver nano particles, and a high-density Raman enhanced hot spot is formed after an agglomeration agent is added; the SERS spectrum is collected at the excitation wavelength of 785 nm and the integral time of 10 s, qualitative distinguishing of drugs is achieved by combining a spectrum angle matching model, and quantitative detection is achieved by constructing a standard curve through the linear relation between the characteristic peak intensity and the drug concentration logarithm. The detection limit of the four drugs is as low as 1.03-1.16 ppb, the classification accuracy rate reaches 100%, the method is obviously superior to existing similar methods, the detection matrix range is wide, such as animal food and dairy products, and universality and high sensitivity are both considered.

The application discloses a kind of low-temperature curing paste of enhanced temperature cycle resistance and preparation method thereof, it is related to chip packaging field, low-temperature curing paste includes by mass percentage: 1-20% thermoplastic resin particles, 0.1-5.0% thermosetting resin, 0.1-1.5% solvent and remaining silver powder;Silver powder includes by mass percentage: 10-45% spherical nanometer silver particles a, 1-5% spherical nanometer silver particles b and remaining micron silver flake;The particle size of micron silver flake is 1-10 μm, the particle size of spherical nanometer silver particles a is 50-100 nm, the particle size of spherical nanometer silver particles b is 5-50 nm, the particle size of thermoplastic resin particles is 1-15 μm.The paste of component allocation of the present application by thermoplastic resin particles and silver powder etc., when joint structure formed by paste solidification experiences temperature cycle, thermoplastic resin particles can melt at high temperature and dynamically fill the pore between silver powder particles, to hinder the migration path of silver atom, inhibit the metal grain growth caused by temperature fluctuation, reduce the internal stress generated by grain coarsening.

The utility model discloses a fresh-keeping device for agricultural product transportation, and relates to the technical field of agricultural product transportation, the fresh-keeping device comprises a box body, a sealing cover, a phase change material layer, a humidity adjusting system, a buffer structure and an intelligent monitoring module, the box body is of a double-layer heat insulation structure, the outer layer is an EPS heat insulation layer, the inner layer is a PE layer, and the middle is filled with phase change materials; the humidity adjusting system comprises a water absorption pad located at the bottom of the box body and a breathable film located at the top of the sealing cover, the buffering structure is a supporting frame, and the surface of the buffering structure is covered with a nano-silver antibacterial coating. Through the cooperation of the double-layer heat insulation structure (EPS + PE) and the phase change material (the phase change temperature of 0-10 DEG C), the temperature in the box is kept stable in a passive mode, the respiration and microbial activity of agricultural products are inhibited, and compared with traditional normal-temperature packaging, the fresh-keeping period is prolonged by 30%-50% (for example, the fresh-keeping period of strawberries is prolonged from 3 days to 7 days). The water absorption pad (sodium polyacrylate) absorbs condensate water, redundant water vapor is discharged in combination with the BOPP anti-fog breathable film (the micropores are 0.1-1 micron), and the humidity is accurately controlled to be 85%-95%.

The application relates to a functionalized glass for SERS detection and a preparation method thereof, characterized by the following steps: a. tetraethyl orthosilicate and oxalic acid are mixed into a 0.02-0.10 moL / L sol in anhydrous ethanol according to a molar ratio of 1:2-5, a stabilizer with a volume of 5-50% is added, and then the mixture is stirred and transferred into a four-necked flask; b. after being heated and stirred for 12-16 hours, an anhydrous ethanol emulsion of polystyrene small balls with a mass fraction of 5-20% and a volume of 6-18% is added; c. an anhydrous ethanol solution of a surfactant P123 with a total mass of 2-8% and a weight concentration of 3-8% is added, and then the mixture is stirred and aged; d. a wet film is prepared on a glass substrate, and then the wet film is dried and kept warm; (2) a nano-silver particle dispersion liquid with a concentration of 5-25 mg / mL is prepared; and (3) the glass substrate prepared in the step d is coated with the nano-silver particle dispersion liquid and dried. The application has the advantages of simple process and low cost; the surface of the porous structure silica nano-particles has a large number of nanoscale gap structures, which is beneficial to obtaining an enhanced silver nano-particle surface plasmon resonance electromagnetic field, and greatly enhances the Raman signal of the adsorbed molecules.

The application discloses a novel flexible printed circuit board and camera module prepared based on weldable low-temperature silver paste, and belongs to the technical field of electronic materials and devices. The conductor pattern in the flexible printed circuit board comprises a main circuit pattern and an auxiliary function structure formed by weldable low-temperature cured silver paste. The curing temperature of the weldable low-temperature silver paste is 87-103 DEG C. The silver paste comprises conductive fillers, a polymer resin system, ester solvents, a curing agent, a silane coupling agent, polyamide wax thixotropic agents, polysiloxane defoaming agents, modified carbon nanotubes, modified antimony tin oxide powder, modified ceramic fillers and low-stress modifiers. The polymer resin system comprises hydrogenated bisphenol A type epoxy resin, diphenyl type epoxy resin and polyacrylate-CTBN copolymer. The conductive fillers comprise silver-coated copper flaky powder, nano silver wire and low-temperature alloy powder. Through the synergistic effect of components and the innovative process, the comprehensive improvement of mechanical properties, conductive properties, high-frequency characteristics and welding reliability is realized under the premise of ultralow-temperature curing.

The invention discloses an antibacterial and wear-resistant functional integrated PP plastic part for an automotive trim and a preparation method of the antibacterial and wear-resistant functional integrated PP plastic part, and belongs to the technical field of automotive trim materials. The plastic part is composed of a modified PP matrix, a coated antibacterial system, a synergistic wear-resistant system and an auxiliary agent, the modified PP matrix is a homopolymerized PP and copolymerized PP blend, the antibacterial system is coated and compounded by nano-silver-zinc and maleic anhydride grafted PP, and the wear-resistant system is formed by synergism of modified talcum powder and polyolefin wax micro-powder. The preparation method comprises the steps of antibacterial agent pretreatment, premixing, blending extrusion and injection molding. The antibacterial rate is larger than or equal to 99%, the 200,000-time friction wear loss is smaller than or equal to 0.04 g, the antibacterial rate after 800-time friction is still larger than or equal to 96%, meanwhile, the notch impact strength is larger than or equal to 12 kJ / m < 2 >, the VOC release amount is smaller than or equal to 0.4 mg / m < 3 >, the problems that an existing PP interior trim part is poor in antibacterial dispersion and unbalanced in wear resistance and toughness are solved, and the PP interior trim part is suitable for high-frequency contact interior trim parts.

This invention provides a low-temperature sintering silver paste for solar cells, its sintering method, and its application. The low-temperature sintering silver paste comprises: 70 wt.%–90 wt.% micro / nano silver powder, 5 wt.%–20 wt.% organic carrier, and 1 wt.%–10 wt.% Ni-based coated glass powder; wherein the micro / nano silver powder comprises 60 wt.%–80 wt.% micron-sized silver spheres with a particle size of 1–3 μm and 20 wt.%–40 wt.% nano-sized silver spheres with a particle size of 20–80 nm; the Ni-based coated glass powder consists of Bi-B-Si glass powder and a magnetic Ni-based alloy coating layer coated with the Bi-B-Si glass powder. This invention introduces micro-nano silver powder and Ni-based coated glass powder into the silver paste. The Ni-based alloy coating layer is magnetic, which enhances the magnetic properties of the glass powder. By combining micro-nano silver powder with electromagnetic field composite sintering technology, the silver paste is rapidly and densely sintered at a lower temperature, which effectively improves electrode conductivity, reduces contact resistance, and enhances contact performance with the silicon substrate, thereby improving photoelectric conversion efficiency and shortening sintering time.

The invention discloses a preparation device and a preparation method for producing and processing highland barley flavor tofu in a plateau low-oxygen environment, and belongs to the technical field of tofu processing, the preparation device comprises a centrifugal drier main body, and the centrifugal drier main body is provided with a pump suction structure; the pumping structure comprises an electric pump mechanism and a filtering mechanism, the filtering mechanism comprises a filter shell unit, and a filter element assembly is arranged on the filter shell unit; the filter element assembly comprises a transparent top plate, and a blocking piece is arranged on the transparent top plate. In the filtering process of the filtering structure, bacteria in drained water can be killed through the nano-silver coatings loaded on the surfaces of the inner filtering plate and the first elastic membrane, the number of the bacteria in the drained water is effectively reduced, and after the centrifugal drying machine body is closed, the bacteria surviving on the inner filtering plate are killed through the nano-silver coatings, so that the bacteria in the drained water are effectively reduced. Blockage of filter holes of the inner filter plate caused by breeding of bacteria on the inner filter plate is effectively avoided, meanwhile, the number of microorganisms such as bacteria in discharged wastewater can be effectively reduced, and ecological protection of plateau regions is facilitated.

The application belongs to the technical field of antibacterial technology, and discloses a kind of photodynamic antibacterial modified polyester fiber and its preparation method, its preparation method is: (1) with SIPM as surfactant, water-soluble silver salt as precursor, ascorbic acid as reducing agent, prepare water-soluble nano silver powder;(2) after esterification reaction of PTA and EG, add EG, SIPM and water-soluble nano silver powder to carry out polymerization reaction in it, obtain photoresponsive active material;(3) with the base material of nano silver antibacterial masterbatch as ECDP, photoresponsive active material is prepared into nano silver antibacterial masterbatch as additive;(4) after melt blending of modified polyester, water-soluble porogen and nano silver antibacterial masterbatch, the spinning melt is obtained, and the spinning melt is spun, then washed, and the photodynamic antibacterial modified polyester fiber is obtained.The photodynamic antibacterial modified polyester fiber has excellent antibacterial and antiviral properties.

The embodiment of the utility model discloses a pair of glasses, and relates to the technical field of glasses. The glasses comprise glasses legs, the surfaces of which are attached with sensors through nano-silver paste; the sensor is attached to the surface of the mirror frame through the nano-silver paste; and the spring needle connectors are arranged at the joints of the glasses legs and the glasses frame and are used for connecting the pins on the glasses legs and the pins on the glasses frame. Therefore, according to the scheme, the sensors can be arranged on the glasses legs and the glasses frame, and good contact is realized through the spring needle connectors.

The invention provides a polymer-free dispersing agent type high-conductivity nano silver powder and a preparation method thereof, and belongs to the field of photovoltaic silver powder, the preparation method comprises the following steps: adding an oxidizing agent and a reducing agent into a base solution containing a dispersing agent and an auxiliary agent for reaction, adding a coating agent after charging is completed, and then adding a curing agent for curing to obtain the polymer-free dispersing agent type high-conductivity nano silver powder. A silver-containing solution is obtained after the reaction time is over, and the silver-containing solution is subjected to the procedures of suction filtration, cleaning, drying, air milling and the like. A traditional polymer dispersing agent is abandoned, the nano silver powder which is excellent in performance and suitable for high-end electronic paste is obtained by improving the preparation technology, the technology is controllable and good in reproducibility, and the method further has the advantages of being simple in technological process, rapid in reaction, easy to operate, green, harmless and the like, and is suitable for industrial large-scale production.

The application discloses a kind of hypersensitive coupling bionic strain sensors and preparation method thereof, belong to the field of strain sensor.The specific method is through coupling bionic arthropod crack receptor and helical growth divergent law of sunflower seed, design coupling bionic strain sensor structure, prepare flexible elastic substrate with micro-nano coupling bionic crack array using replication transfer method, and carry out ion sputtering and plate a layer of nano silver film, obtain the resistance layer deposited on flexible elastic substrate and micro-nano coupling bionic crack array.Finally, copper wire electrode is packaged on the surface of resistance layer, and a kind of coupling bionic strain sensor is obtained, which not only has ultrahigh sensitivity, but also good durability, rapid response time and recovery time, simple structure, and excellent performance in all aspects.

The embodiment of the present application provides a kind of N type TOPCon cell front silver aluminum paste and its preparation method and cell, wherein, the N type TOPCon cell front silver aluminum paste provided in the embodiment of the present application includes aluminum powder, silver powder, nano alloy powder, organic binder, glass powder and organic additive, wherein the nano alloy powder is one or more of nano silver aluminum alloy powder, nano aluminum boron alloy powder and nano aluminum silicon alloy powder.In nano silver aluminum alloy powder, nano aluminum boron alloy powder and nano aluminum silicon alloy powder, all have the characteristics of nano size particle size, high tap density, low oxygen content and high activity, so that the front silver aluminum paste added with the nano alloy powder can quickly form a good alloy with silicon at a lower sintering temperature, reduce the contact resistivity of front silver aluminum fine grid and cell, not only avoid the appearance of top needle print during EL test, but also improve the filling of cell and the efficiency of cell.

The invention relates to the technical field of electronic materials, in particular to thick film paste and a preparation method thereof, ZBS glass powder which is highly compatible with AIN ceramic and has specific components and particle sizes is adopted as a binding phase, an organic carrier formula is optimized, the thick film paste solves the problems of interface bubbles and layering caused by mismatching of traditional paste and an AIN substrate, and the thickness of the thick film paste is increased. The sufficient wetting of the glass relative to the substrate and the silver powder is realized, and a key foundation is laid for forming a compact and firmly combined metallized layer; according to the thick film paste, micron silver powder, nano silver powder and flake silver powder are compounded according to a specific proportion, the synergistic filling and overlapping effect of the silver powder with different morphologies is fully utilized, a more continuous and compact three-dimensional conductive network is constructed after sintering, and therefore the surface sheet resistance of a metallization layer is remarkably reduced, and the thickness of the metallization layer is improved. And excellent conductivity is obtained.

The invention relates to the technical field of cables, solves the problem that an existing aerospace cable is insufficient in vibration fatigue resistance and high-energy radiation resistance, and particularly discloses a multi-layer shielding optical fiber composite aerospace cable and a preparation method thereof.The multi-layer shielding optical fiber composite aerospace cable comprises an insulating layer, an inner shielding layer, a buffer bonding layer and an outer shielding layer which are sequentially arranged from inside to outside; a conductor core and an optical fiber bundle are arranged in the insulating layer, and the insulating layer comprises a bonding transition layer, a core insulating layer and an anti-radiation protection layer from inside to outside; the inner shielding layer comprises a nano-silver conductive film and a silicone rubber elastic layer, and the nano-silver conductive film is arranged on the inner side of the silicone rubber elastic layer; the outer shielding layer is provided with a nickel-copper alloy wire woven mesh; and the buffer bonding layer is provided with a modified polyimide adhesive layer. According to the optical fiber composite aerospace cable and the preparation process thereof, the shielding, buffering and interlayer bonding performance of the cable is guaranteed through control over the inner shielding layer, the buffering bonding layer and related preparation parameters, and the optical fiber composite aerospace cable adapts to aerospace application requirements.

The invention discloses a precursor of low-temperature sintering silver colloid, a slurry composition and application thereof. A precursor of the low-temperature sintered elargol is micro-nano powder with a core-shell structure and comprises a shell layer and a core layer, the shell layer and the core layer are selected from different silver compounds; the oxidability of the core layer is greater than that of the shell layer; the low-temperature sintering silver colloid slurry composition comprises micron silver powder, nano silver powder, a precursor, a solvent and a rheological additive. A coating agent on the surfaces of silver powder particles is powerfully removed by applying a strong oxidizing nuclear layer, driving force is provided for diffusion of silver atoms, and after the silver colloid slurry composition is prepared, efficient densification sintering of the silver colloid slurry composition can be achieved under the low-temperature and pressure-free condition; the stability of the alcohol solvent in the silver colloid slurry composition is improved through the technology of coating the strong oxidation core layer with the weak oxidation shell layer; the micro-nano silver powder is prevented from being agglomerated or settled through the rheological additive, so that the problem of poor rheological property stability of the elargol slurry composition in the storage and construction processes is effectively improved.

The invention relates to the fields of environmental protection, fire protection and new materials, in particular to a nano-silver self-assembled efficient disinfectant synthesized by a water extract of epimedium stems. The method comprises the following steps: weighing 10 g of epimedium stem powder, putting the epimedium stem powder into a beaker, then adding 100 mL of purified water into the beaker, putting the beaker on an electrothermal furnace, heating until boiling, then heating for 30 min, after a solid-liquid mixture is cooled, filtering impurities by using gauze, centrifuging for 10 min at a speed of 4000 r / min, retaining supernate, and fixing the volume to 100 mL; 0.17 g of silver nitrate powder is weighed and added into a beaker, then 100 mL of purified water is added for dissolution, and a silver nitrate solution is prepared; adding 20mL of the water extracting solution of the epimedium stems after constant volume into the beaker; mixing the solution, and stirring for 2 hours by using a magnetic stirrer; and the temperature is 60 DEG C to obtain the herba epimedii water extract-nano-silver self-assembled solution.