3736 results about "Silver Nano" patented technology

The invention relates to a method for preparing a nano silver-containing anti-bacterial fabric by an immersion process. The method comprises the following steps: dissolving dopamine hydrochloride in Tris buffer solution; adjusting the pH value of solution to be between 7 and 10 by using hydrochloric acid; immerging a fabric into prepared dopamine solution in a bath ratio of 1:30; after stirring for reacting at the temperature of between 20 and 40 DEG C for 20 to 30 hours, taking the fabric out and washing to obtain a poly dopamine film-coated fabric; putting the fabric into silver nitrate aqueous solution; and after immerging for 8 to 10 hours, washing and drying the fabric to obtain the nano silver-containing fabric. The nano silver-containing fabric prepared by the method has the characteristics of high soaping fastness resistance and lasting antibiotic property; a sterilizing rate is still up to 100 percent after the fabric is washed with water for 30 times; and the preparation method has the characteristics of simple process, no pollution to the environment, low cost and large-scale production.

The invention discloses a nano silver bacterial fibre preparation method comprising: adding fibre into AgNO3 solution, and adsorbing the mixture; and carrying out reduction reaction on the adsorbed fibre to obtain the nano silver bacterial fibre. The invention has simple production step, and the obtained product has the advantages of even silver nanoparticle distribution and long-lasting fibre antibacterial property and can be washed several times. The invention is suitable for natural fibre and synthetic fibre and can be used for health-care underwear, medicinal gauze, clothes, decorative textiles and the like.

The invention discloses a method for preparing nanometer silver lines in large batch. anhydrous silver nitrate AgNO3 with the concentration of 99.9percent, anhydrous glycol (C2H6O2) of 99.8percent and polyvinylpyrrolidone (PVP, with the molecular weight of 55,000) of 98percent are selected as the raw materials; in a microwave-assisting environment, the method of adopting the glycol to reduce the silver nitrate is adopted to prepare nanometer silver lines in large batch. By replacing the original solvent heating method with the high-heat environment created by microwave, the method not only greatly saves the reaction time but also reduces the preparing costs for the nanometer silver lines. The glycol, a moderate reducer, can slow the reaction, thus providing the time for the growth of nanometer silver lines. The method of the invention is the optimal method for preparing the nanometer silver line according to testing results by comparing the influence of micro strength, precursor concentration and microwave processing time on the appearance and size of the prepared nanometer lines. The method of the invention has low cost, is simple method and easily controlled and has high practical value in the application to the industrial production developing nanometer silver lines.

The present invention relates to a process for preparation of silver complex compound and the compositions of silver ink containing the same. The present invention includes a) preparing silver complex compound with special structure by reacting silver compound with at least one or two mixtures selected from ammonium carbamate compound, ammonium carbonate compound or ammonium bicarbonate compound and b) preparing silver nano particles by reacting the silver complex compound with reducer or reducing or pyrolyzing the silver complex compound by applying heat thereto. The preparing method according to the present invention can prepare the silver nano practical with various shapes through a simple preparation process, improve the selectivity of the size of the silver complex compound, fire the silver complex compound even when it is fired at a low temperature of 150° C. or less during a short time, provide the ink compositions capable of forming the coating or the fine pattern showing the high conductivity while facilitating the thickness control of the coating, and provide the ink compositions capable of being applied to the reflective film material, the electromagnetic wave shield, and the antimicrobial agent, etc.

The invention provides a method for preparing a nano-silver wire with high length-diameter ratio. At least one polyhydroxy liquid organic (1), silver nitrate (2), polyvinylpyrrolidone (PVP) with a K value equal to or larger than 30 (3), at least one hydrogen nitrate compound or one hydrogen-containing compound (4) and at least one chloride for a reaction solution, wherein the chloride can be dissolved in the polyhydroxy liquid organic and can produce chloride ions after dissolved. Reaction is perform for more than 10 minutes under the condition that the reaction temperature is lower than the boiling temperature of the polyhydroxy liquid organic or a part of ingredients is subjected to chemical reaction to form a nano-silver wire solution containing length-diameter ratio exceeding 200, and solid-liquid separation is performed to obtain the nano-silver wire or nano-silver wire dispersing liquid. The nano-silver wire prepared by means of the method is high in length-diameter ratio and yield, few in impurities and good in thickness and length uniformity, and the shortcomings including complicated preparing technology process by means of a traditional polyol method, many impurities and non-uniformity by means of a microwave method and the like are overcome.

The invention relates to a preparation method of colloid of mono-dispersed silver nano particles and nano silver powder, and conductive ink prepared on the basis of the nano silver powder. The method comprises the following steps of: dropwise adding a reducing agent solution in a constant-flow manner to the mixed solution of silver salt precursor and a dispersant to obtain a reaction system; after reaction is finished, obtaining the colloid of the mono-dispersed silver nano particles; performing centrifugation on the colloid of the mono-dispersed silver nano particles; cleaning the precipitate with a cleaning agent and drying to obtain the nano silver powder; and mixing the nano silver powder, a terpene alcohol compound solvent and auxiliaries to prepare the conductive ink. The method forpreparing the colloid of mono-dispersed silver nano particles provided by the invention has simple and quick process, high product output, mild preparation conditions, and no need of protection of inert gas. The terpene alcohol compound solvent used for preparing the conductive ink can uniformly disperse the nano silver powder and can maintain long-time stability. The terpene alcohol compound solvent can keep the conductive ink and a substrate in a good spread state.

The invention provides a production method of a silver nanowire transparent conductive film. The production method comprises the steps of: preparing a silver nanowire coating liquid, and coating the silver nanowire coating liquid on a base material sheet to obtain a silver nanowire conductive coating; coating an oxide sol on the upper surface of the silver nanowire conductive coating to obtain an oxide protective layer; and forming the silver nanowire transparent conductive film on the base material sheet after baking and curing. The transmittance of the silver nanowire transparent conductive film prepared by adopting the method can reach 85 to 91%, the haze of the same is less than or equal to 2%, the surface resistivity of the same ranges from 10 to 200ohm / sq, and the surface hardness of the same ranges from 6 to 8H.

The present invention relates to a cosmetic pigment composition exhibiting colors in the visible region, which comprises an effective amount of nanoparticles or a mixture of two or more nanoparticles selected from the group consisting of (a) gold nanoparticles exhibiting red color; (b) silver nanoparticles exhibiting yellow color; (c) gold-silver alloy nanoparticles exhibiting flame color; and (d) gold nanoparticles exhibiting blue color, and a color cosmetic composition and a color lotion comprising the pigment composition. According to the present invention, it is possible to prepare pigments exhibiting various colors in the visible region using gold or silver nanoparticles, and a cosmetic pigment composition which can exhibit various colors by mixing the pigments in various compositional ratios, in which precipitation or agglomeration of particles does not occur, and whose color can be maintained for a long time. Also, since the pigment of the present invention is not harmful to the human body unlike conventional metal pigments, and contains gold or silver that is beneficial to health, the pigment can be used in various applications as functional raw materials.

The invention relates to an omnidirectional antibacterial intelligent type air purifier for a vehicle, which comprises a shell, an air purification component, a fan power component, an energy component, an induction sensor component, a negative-ion generator and a display intelligent control component. The omnidirectional antibacterial intelligent type air purifier for the vehicle uses a nano silver modified titanium dioxide as a photocatalyst, thereby increasing photocatalysis effect and sterilization antibacterial performance. The omnidirectional antibacterial intelligent type air purifier for the vehicle uses an ultraviolet light emitting diode as a ultraviolet light source, thereby guaranteeing the photocatalyst to be capable of playing the role of degrading pollutants efficiently. The inner surface and the outer surface of an enclosure all have antibacterial performance, thereby guaranteeing bacteria not to live on the surface of an airframe of the omnidirectional antibacterial intelligent type air purifier for the vehicle, and guaranteeing personal safety. The omnidirectional antibacterial intelligent type air purifier for the vehicle can automatically induct air conditions, adjusts purification power in real time, and has intelligent control function.

The invention provides a nano-silver antibacterial fabric and a preparation method thereof. The nano-silver antibacterial fabric has the characteristics that a zinc oxide nano line grows on the fabric; and silver nano particles are deposited on the zinc oxide nano line. The zinc oxide nano line is synthesized by a solution chemical method; and the silver nano particles are deposited on the zinc oxide nano line by a simple 'immersion-illumination' method. The nano-silver antibacterial fabric prepared by the method has extremely obvious long-time antibacterial performance; the silver nano particles are small in size and cannot be accumulated; a synthesis process is environment-friendly; and the nano-silver antibacterial fabric can be recycled and reused. The nano-silver antibacterial fabric can be used for single-point water treatment to reduce microorganism content in water and can be suitable for medical surgical dressing and medical fabrics; and the nano-silver antibacterial fabric can be used as an antibacterial air filtration device for preventing bio-aerosol from being gathered on a ventilating, heating and air conditioning system.

The invention relates to a polyvinyl alcohol / chitosan nano fiber film dressing containing nano silver and preparation thereof. The nano fiber film dressing is prepared by the following steps: taking a mixture of polyvinyl alcohol and chitosan as the base material, then mixing nano silver into the polyvinyl alcohol / chitosan nano fiber film through an electrostatic spinning technology, and finally adding glutaraldehyde to crosslink the nano fiber film so as to obtain the target product. The obtained dressing has the characteristics that the preparation technology is simple; a wet environment can be achieved for promoting wound healing; and the dressing has an antiseptic function.

The invention discloses ramie cotton fabric inorganic nanometer antibacterial finishing agent and a preparation method thereof. Silver nitrate and micro-molecular organic or inorganic reducing agent, such as ascorbic acid, tannic acid, tartaric acid and the like, are added into polyethyleneglycol and the mixture engages in deoxidization under 5-100 DEG C, producing nanometer silver with good dispersivity and stability. The polyethyleneglycol accounts for 50-90%of the weight and the ratio of silver salt to micro-molecular reducing agent is 1:1-4:1. The prepared nanomemter silver is dispersed in aqueous medium so as to get nanometer silver finishing agent and the weight percentage of nanometer silver is 0.25%-0.5%. The ramie cotton fabric can be made into composite material with excellent antibacterial effect after being soaked in the finishing agent. The fabric made from the antibacterial finishing agent has the characteristics of quick, efficient, broad-spectrum and lasting antibacterial effect. The preparation method and the finishing process are simple in technique and low in cost and have no pollution and are easy to industrialize.

The present invention belongs to metal-based composite material technology. The electric contact material consists of Ag 70-97 wt%, nanometer tin oxide 3-22 wt% and RE elements 0.1-8 wt%. The electric contact is produced through the processes of preparation of zine oxide or titanium oxide doped nanometer tin oxide, mixing metal oxide powder, pressing the mixture to form, sintering, extruding, drawing wire and forming into rivet type or stripe contact. The pressure in pressing the mixture to form is 150-400 MPa and the sintering temperature is 800-900 deg.c. The electric contact can be used inelectric appliance, instrument and switch.

The invention discloses multi-component super-molecular hydrogel and a preparation method of the multi-component super-molecular hydrogel. The hydrogel is formed by a component containing a strong hydrogen bond, a component containing a weak hydrogen bond and water, wherein the component containing the strong hydrogen bond is one or more of a carbon oxide nano tube, graphene oxide, a carboxylated ferroferric oxide nano particle, a carboxylated silver nano particle, a carboxylated quantum dot, polyacrylic acid, polypropylene glycol, polyvinyl alcohol, polyurethane, polyamide and poly(p-styrene) sodium sulfonate; and the component containing the weak hydrogen bond is a small-molecular compound or a high-molecular compound. A lot of cross-linking force of the hydrogel disclosed by the invention comes from the weak hydrogen bond so that the hydrogel is very sensitive to the stimulation of an external environment; when chemical components are proper, gel-sol conversion can be carried out under the effects of temperature rising, near-infrared light illumination and acids; and the conversion is reversible, namely the gel-sol conversion can be carried out under the effects of temperature reduction, removing of a near-infrared light source and alkalis.

The invention discloses a method of preparing an antibacterial anti-pollution ultrafiltration membrane by adopting a silver-loaded nano composite material. The method comprises the following steps: preparing a nano material water dispersion solution, adding trihydroxymethyl aminomethane and dopamine hydrochloride, stirring and reacting for 2 to 12 hours, centrifugally washing, then drying to obtain a polydopamine-modified nano material; preparing a mixed solution containing the polydopamine-modified nano material, a silver-ammonium solution, a stabilizer and water, stirring for 2 to 12 hours, centrifugally washing, and then drying to obtain the silver-loaded nano composite material; dispersing the silver-loaded nano composite material in an organic solvent, adding a membrane material, stirring, completely dissolving the membrane material, and standing to obtain a membrane casting solution; and scraping the membrane casting solution into a flat membrane by utilizing a flat membrane scraping machine, immersing in a coagulating bath, and carrying out a phase conversion to obtain the antibacterial anti-pollution ultrafiltration membrane. The ultrafiltration membrane has good hydrophilia, durable antibacterial performance and excellent anti-pollution performance, has good antibacterial and sterilization effect for colibacillus, bacillus subtilis and the like; moreover, the silver nano particles stably exist in the antibacterial anti-pollution ultrafiltration membrane.

The invention discloses a method for preparing a stable transparent electrode provided with a neutral PEDOT / PSS conducting layer. The transparent electrode comprises a transparent base material layer and the conducting layer covering the transparent base material layer, wherein the conducting layer comprises a coated first silver nanowire conducting layer part and a second neutral PEDOT / PSS macromolecule conducting layer part or a macromolecule conducting layer part formed by mixing neutral PEDOT / PSS with silver nanowires, and the PEDOT / PSS macromolecule conducting layer part is made of neutral PEDOT / PSS conductive ink. The preparing method comprises the steps that 3,4-EDOT is polymerized into PEDOT / PSS dispersion liquid in the presence of PSS, alkaline additives are added to regulate the PH, neutral PEDOT / PSS dispersion liquid is obtained after the ink strength is high enough through the seasoning technology, and at least one kind of organic functional auxiliaries is added to the neutral PEDOT / PSS dispersion liquid to obtain the stable transparent electrode. The transparent electrode prepared with the method has the advantages of being high in conductivity, high in light permeability, simple in preparing technology, resistant to weather and current stability and the like and can be applied to the fields such as organic solar cells, organic light emitting diodes and touch display screens.

The invention relates to a nanometer silver collosol, a preparation method and an application thereof. The preparation method comprising the following steps: dissolving reductor, alcohol and fatty alcohol in a closed reactor to prepare a mixed dispersion reductor solution; and then carrying out reaction between a silver salt alcohol solution and the mixed dispersion reductor solution for 6-72 hours under the temperature of 35-70 DEG C to obtain the nanometer silver collosol. The nanometer silver collosol has good antibacterial property and is very stable, safe in use and low in production cost, thereby being extensively used for the antibacterial processing of textiles and the antibacterial and deodorizing processing of shoes and having strong market competitiveness.

The invention provides a flexible transparent conductive film based on silver nanowires and a preparation method. The transparent conductive film comprises a silver nanowire network layer (1), a nano particle filled layer (2) and an optical adhesive layer (3). The prepared transparent conductive film based on the silver nanowires is low in resistance, high in transmittance and surface evenness and simple in structure and preparation process, operation is simple and convenient, no high-temperature and high-pressure process is needed, safety is guaranteed, energy consumption is low, and a cumbersome process of film transferring is not needed. Meanwhile, the flexible transparent conductive film is low in cost and suitable for large-scale application.

Ultraviolet-preventing antibacterial fabric comprises, by weight percentage, 10-15% of adhesive anion functional fibers, 10-15% of soybean protein fibers, 20-30% of bast fibers, 5-10% of wool fibers, 5-10% of nanometer bamboo carbon fibers, 10-15% of chitin fibers, 2-5% of nano-silver-ion fibers, 4-6% of ultraviolet-preventing finishing agents, and 2-4% of mosquito-repellent finishing agents. The ultraviolet prevention performance and air permeability of the fabric are improved, and meanwhile the fabric has effects of preventing bacteria and repelling mosquitoes. The fabric is good in application effect in home textiles, sanitary products, sports goods, health care, bacteria prevention and mosquito repellent.

The invention relates to an air purifying composition, and a preparation method and use thereof. The method comprises: adding 0.1 to 40 parts of mixed fatty alcohol, 0.01 to 10 parts of dispersing aid, 106 parts of water and 0.01 to 5 parts of synergistic components into a reaction kettle under normal temperature and at room temperature, and fully stirring; adding 0.01 to 10 parts of nano silver solution and 0.05 to 10 parts of plant extract in turn, and uniformly stirring; and performing ultrasonic dispersion treatment on the mixture in the reaction kettle to obtain the air purifying composition. The air purifying composition prepared by the method has high antibacterial performance, can effectively remove harmful volatile organic matters and improve air quality in rooms, carriages, public places and the like, is safe and low in production cost and has high market competitive power.

The invention relates to a method for loading silver nano-particles on a cellulose-containing material, belonging to the field of the preparation of inorganic nano materials. By using the structure that cellulose is rich in hydroxyl and by using the cellulose as a reducing agent, the in-situ growth of nano silver on the cellulose is realized under the condition of heating. The reaction is simple to operate and easy to control, the repeatability is good, no pollution is caused, the cost of raw materials is low and the large-scale production is easy to realize. The obtained cellulose-containing material loaded with the nano silver has the advantages of even nano silver size and distribution and high adhering firmness, and can be widely used for antibacterial packaging paper, medical nursing sterilizing articles, paper for women and the like. The nano silver loaded on the cellulose-containing material has very high and stable enhancing effect and the material can also be used for surface enhanced Raman spectrum substrates.

The invention discloses a silvered graphite and its producing method which is coated by outside plated nano graphite microchip. The method includes: making the nano graphite microchip orderly sensitize, activate, degelation pretreat, and re-disperse in the ethanol water solution, adding a certain amount of aminosilane as mother liquid; adding the silver nitrate into deionized water for dissolving, adding ammonia and / or sodium hydroxide to get [Ag(NH3)2]OH] solution, then feeding the reducing agent and [Ag(NH3)2]OH] solution into the mother liquid that finishing the nano graphite microchip silvering, filtering and washing, drying in vacuum to obtain silvered nano graphite microchip. The inventive silvered graphite has a high conductivity, a low density, a low cost, a low resistivity in which the pulverous volume resistivity is 8*10-5omegacm. The method has a simple craft, a low demanded device. The produced nano graphite microchip is silvered an even and continuous silver layer on surface with a high availability of silver nitrate.

The invention discloses a preparation method of a flexible surface enhanced Raman substrate. The method comprises the steps of preparing a flexible substrate of a micro-nano structure with a regular appearance, sequentially carrying out surface hydrophilic treatment and silanization treatment on the flexible substrate, then depositing gold-silver nano particles on the surface of the flexible substrate, wherein sufficient gold-silver nano particles can be deposited, and the gold-silver nano particles are uniformly distributed. The prepared flexible surface enhanced Raman substrate is high in detection sensitivity, good in signal consistency and convenient to use; the preparation method is simple in process and easy to operate.

The invention provides a method for preparing a silver / graphene antimicrobial composite material, and the method provided by the invention comprises the following steps: a) providing a reductive graphene oxide-sodium polystyrene sulfate composite solution; b) heating the composite solution obtained in the step a) to 50-70 DEG C; and c) adding a silver nitrate solution into the heated composited solution obtained in the step b) for reaction, thus obtaining the silver / graphene antimicrobial composite material. The invention provides the method for preparing the silver / graphene antimicrobial composite material; and in the method, a reductive graphene oxide tablet is taken as a reducing agent for carrying out reduction on silver ions under a neutral pH condition so as to generate silver nano particles. In the method provided by the invention, no sodium borohydride is taken as a reducing agent, and in the whole preparation process, no potassium hydroxide is adopted, therefore, when the composite material prepared by the method is subjected to later application, no large biological irritant is caused. In addition, antibacterial experiments show that the silver / graphene antimicrobial composite material provided by the invention has a better antibacterial effect.

The invention discloses a nano-silver antibacterial composite modified by modified chitosan and a preparing method of the nano-silver antibacterial composite. According to the nano-silver antibacterial composite and the preparing method of the nano-silver antibacterial composite, the chitosan with the small molecule quantiy and good water solubility is selected and used as a raw material, chemical modification is conducted on the chitosan by using small molecules which are capable of having chelation with nano-silver particles, the modified chitosan is arranged on the surfaces of the nano-silver particles in a covalent modification mode, and the novel nano-silver antibacterial composite is prepared. The prepared nano-silver antibacterial composite modified by the modified chitosan has good water solubility and dispersibility and can be stably dispersed in a water solution in a long term without aggregation under the conditions of high salinity and wide pH. The prepared nano-silver antibacterial composite modified by the modified chitosan enables the antibacterial property of the chitosan and the antibacterial property of nano-silver to be in effective synergy, the antibacterial performance is good, and the nano-silver antibacterial composite can serve as a water coating agent to perform the surface antibacterial function on the surfaces of materials and can also permeate into fiber type materials to perform the deep internal antibacterial function.

The invention belongs to the technological field of nanometer material, in particular to a method for synthesizing mass silver nano-wires of high concentration. The method takes silver nitrate as the silver source and stainless steel as an assistant agent. The material protected by inactive gas is oil-bathed at the temperature of 100 to 200 DEG C for 30 to 300 min in a recycling device, then silver nano-wires of the diameter of 50 to 800 nanometers and the length of 1 micrometer to 100 micrometers can be obtained, and the composition of the product is pure silver. The silver nano-wires made by the method have the advantages of regular crystal structure, large specific surface and controllable thickness and length. The silver nano-wires have wide application value in the field of optics, electricity and material, synthesis of polymer composites that is electricity and heat conductive, electrical radiation and static electricity proof and antibacterial, assembly of nanometer devices, design of advanced catalyst, biological fluorescence label, micro transmission, nanometer memory material, reinforced fluorescence and enhanced Raman spectroscopy, etc.

The invention provided synthesis and application of a nano-silver antibacterial fiber. The fiber from natural polymer fibers or synthetic polymer fibers, or both portfolio and nano-silver composition, and the silver nano particle size range of 10~80nm. Fiber can be used sausage or PGA fiber. In particular, medical lines or used medical dressings. The nano-silver antibacterial line and bandages have long-lasting and broad-spectrum antibacterial activity, non-toxic, non-stimulating, security features applicable to a variety of medical uses.

The invention provides hemostatic bacteriostatic biological dressing and a preparation method thereof. Nano silver and hemostatic medicament are uniformly distributed in a spongy or film-like biological dressing matrix made of a biological material, wherein the weight of the nano silver is 0.01 to 3 percent of the weight of the biological material, and the weight of the hemostatic medicament is 0.1 to 10 percent of the weight of the biological material. The method for preparing the spongy biological dressing comprises the following steps of: soaking the freeze-dried sponge into silver nitrate solution to prepare nano silver-carrying biological sponge at a high temperature under a high pressure, and soaking the nano silver-carrying biological sponge into solution containing the hemostatic medicament to obtain the spongy biological dressing by freeze drying. The method for preparing the film-like biological dressing comprises the following steps of: preparing biological material solution containing silver nitrate into nano silver-carrying solution at a high temperature under a high pressure, adding the hemostatic medicament into the cooled nano silver-carrying solution, casting the mixture to form a film, and drying the film at room temperature to obtain the film-like biological dressing. The hemostatic bacteriostatic biological dressing has the characteristics of safety, no toxicity, good biocompatibility and degradability and obvious bacteriostatic and hemostatic effects; and the preparation method is simple and has strong operability and low cost.