80 results about "SILVER COLLOIDAL" patented technology

The present invention relates to a high-concentration nanoscale silver colloidal solution and the preparing process thereof. The colloidal solution of the present invention comprises a high content of silver particles, i.e. approximately 1.5 wt %. The mean size of the nanoscale silver is less than 10 nm. In the preparing process, silver salt, ionic chelating agent, stabilizing agent, reducing agent, solvent and reaction accelerator are homogeneously mixed together. The increase of reaction temperature by external heat source accelerates completed reaction. By using the specified reaction accelerator and chelating agent and under the operating condition of the present invention, high-density silver colloidal solution is obtained while inhibiting particle aggregation. Therefore, the resulting nanoscale silver colloidal solution contains very small-sized particles and the stability thereof is satisfactory.

The present invention relates to the preparation process of nano silver colloidal water solution. By means of double injection controlling technology and under the stirring with the stirrer, argentamine and reductant aqua are injected simultaneously into the reaction system containing protecting agent aqua to generate nano silver particle, and through ultrafiltering to desalt, nano silver colloidal water solution with average size smaller than 50 nm is obtained. Thus obtained nano silver colloidal water solution is stable, good in dispersion, small and homogeneous in size, and the preparation process is automatic, short in production period, low in cost and suitable for industrial production.

A pretreatment solution for providing a catalyst for electroless plating and a pretreatment method using the solution are provided. The pretreatment solution comprises a silver colloidal solution containing, as essential components, at least the following components (I), (II) and (III): (I) silver colloidal particles, (II) one or more ions selected from an ion of a metal having an electric potential which can reduce a silver ion to metal silver in the solution and an ion oxidized at the time of reduction of the silver ion, and (III) one or more ions selected from a hydroxycarboxylate ion, a condensed phosphate ion and an amine carboxylate ion, the silver colloidal particles (I) being produced by the ion of the metal (II) having an electric potential which can reduce a silver ion to metal silver. When an object to be plated is pretreated by use of the pretreatment solution, provision of an effective catalyst for electroless plating is achieved.

The invention relates to a nanometer silver glue solution and the method for preparing the same, comprising stabilizer, mixing reducer I, mixing reducer II, and argentic salt and pure water. The method comprises following steps: putting stabilizer solution, argentic salt solution and mixing reducer I solution into autoclave, stirring thoroughly; putting mixing reducer II into autoclave; dropping even mixing solution into another even mixing solution autoclave under continuous stirring, stirring and getting nanometer silver glue solution. The product should be stored sealed and at low temperature. The invention is characterized in that: it employs two kinds of reducer to prepare nanometer silver glue solution, and a systematic nanometer silver glue solution of low-and-high concentration, the process is simple, and the product can be used as medicine, food, cosmetics, disinfecting agent and so on.

The invention relates to a method for preparing nano-silver by taking modified chitosan as a reducing agent. The method includes: dissolving chitosan in a 3% acetic acid solution with the bath ratio of 1:50, performing ultrasound treatment for 1-12h, then adding 2-10g/L of sodium periodate, performing photophobic reaction at the temperature of 40-80 DEG C for 10-60min, repeatedly cleaning with deionized water, and performing centrifuging and drying for standby application; then mixing chitosan liquid modified by 0.01-100g/L of sodium periodate with 0.01-100g/L of Tollens' reagent, performing ultrasound treatment at the temperature of 20-80 DEG C for 1-10h to obtain nano-silver colloidal solution, repeatedly cleaning with ethyl alcohol and deionized water, and performing centrifuging and drying treatment to obtain nano-silver. By taking chitosan modified with the sodium periodate as the reducing agent and a stabilizer, the method has the advantages of simple technology, mild reaction, greenness, environment friendliness and the like.

The invention discloses a nano-silver colloidal solution, a preparation method for the nano-silver colloidal solution and application of the nano-silver colloidal solution. The preparation method includes the steps of mixing an anti-acarien active matter water solution with the mass volume concentration of 10g/L-80g/L with a silver salt water solution with the concentration of 0.01g/L-100g/L according to the volume ratio of 1:100-100:1, gradually dropping a certain volume of reducing agent water solution into the mixture while stirring the mixture at a constant speed at the temperature of 10DEG C-90DEG C, and stirring the mixture for 1-600min until complete reaction to achieve the nano-silver colloidal solution with the average grain diameter of 1-100nm. The preparation method has the advantages that due to the fact that anti-acarien active matter frequently used in anti-acarien textiles is used as a protective agent to prepare nano-silver, the nano-silver can achieve anti-bacterium and anti-acarien effects at the same time, and the preparation method is suitable for anti-bacterium and anti-acarien compound functional finishing for the textiles.

A method and apparatus for enabling chemical identification of individual particles, cells of molecules by obtaining a Raman spectrum of a particle, cell or molecule as it flows past a sensing point in a flow cytometer. The particles, which may be cells or molecules, are associated with a suitable noble metal colloid or colloidal aggregate. Cellular particles may be associated with gold or silver colloidal particles by ultra-sonic sonification while in a sample preparation reservoir containing the gold or silver colloidal suspension. The colloid associated particles are then hydrodynamically focused into a single file by a fluid control module. The surface-enhance Raman Spectrum of individual particles are obtained by illuminating the particle with a laser as the particle flows past a sensing point and gathering the light that is non-elastically scattered (Raman scattered) by the particle. The surface-enhanced Raman spectrum is then analyzed to identify the particle.

The invention discloses a method for rapidly detecting clenbuterol in urine based on a surface-enhanced Raman spectrum. Dichloromethane or ethyl acetate is adopted as an extraction solvent, an acidic aqueous solution and an organic solvent are adopted as a purification extracting solvent for carrying out liquid-liquid extraction on an extracting solution, nano gold or nano silver colloidal solution is adopted as an enhancing reagent, and a 785nm laser source Raman spectrum with the laser energy of 200mw is adopted for scanning a detection solution on a machine; and displacements 1258 minus or plus 2 cm<-1>, 1470 minus or plus 2 cm<-1> and 1601 minus or plus 2 cm<-1> are taken as characteristic peaks for judging clenbuterol; and normalization is carried out on strength of a corresponding peak 1450 minus or plus 2 cm<-1>, a linearity curve and the strength of the corresponding peak 1470 minus or plus 2 cm<-1> are combined to calculate content of clenbuterol, and rapid detection on clenbuterol in the urine are carried out qualitatively and quantitatively. A preparation method of a nano gold size is simple, operation time of pre-treatment is short, repeatability is good, and flexibility is high, in-field rapid detection can be realized, and supervision requirement can be met.

The invention relates to a preparation method of nano-silver. The preparation method comprises the following steps: mixing drinks available in the market with silver-ammonia solution with a mass fraction of 0.01-100 g/L according to a volume ratio of 100:1 to 1:1; performing ultrasonic treatment for 1-10 hours under the temperature condition of 20-60 DEG C to obtain nano-silver colloidal solution; repeatedly cleaning with ethanol and de-ionized water; centrifuging; drying to obtain the nano-silver. The juice type drinks and tea type drinks available in the market are directly used as a reducing agent and a stabilizing agent without a complex plant and peel active matter extraction process; the method has the advantages of simple process, wide raw material source, mild reaction, environment friendliness and the like.

The present invention provides a fabricating method for natural cellulose fiber blended with nano silver.

The fabricating method comprises following steps:

• • Firstly, prepare nano silver colloidal sol by reduction titration for mixture of polyvinyl alcohol (PVA), silver nitrate (AgNO₃) and sodium borohydride (NaBH₄).
  • Secondly, prepare mixing cellulose serum by blending agitation for mixture of wood pulp, N-methylmorpholine N-oxide (NMMO) and stabilizer.
  • Thirdly, produce spinning dope by blending and dehydrating the nano silver colloidal sol and mixing cellulose serum.
  • Fourthly, produce fibrous tow by Dry-Jet Wet Spinning method in association with coagulation, regeneration in coagulation bath, and water rinse.
  • Finally, obtain final product of natural cellulose fiber blended with nano silver by post treatments of dry, oil and coil in proper order.

The present invention provides a fabricating method for spunbond nonwoven from natural cellulose fiber blended with nano silver, which comprises following steps.

Firstly, prepare nano silver colloidal sol by reduction titration for mixture of polyvinyl alcohol (PVA), silver nitrate (AgNO₃) and sodium borohydride (NaBH₄).

Secondly, prepare mixing cellulose serum by blending agitation for mixture of wood pulp, N-methylmorpholine N-oxide (NMMO) and stabilizer.

Thirdly, prepare blending mucilage from mixing cellulose serum via blending process.

Fourthly, produce spinning dope by blending and dehydrating the nano silver colloidal sol and mixing cellulose serum.

Fifthly, produce molten filament tow by spunbond spinning method in association with coagulation, regeneration, water rinse and high-speed stretching process.

Finally, by post treatments of hydro-entangled needle punching, drying, winding-up processes in proper order, obtain final product of spunbond nonwoven from natural cellulose fiber blended with nano silver, which is biodegradable with features of antibacterial and antistatic capabilities.

The invention discloses a method for rapidly detecting melamine in forage based on a surface enhanced Raman scattering spectrum. The method comprises the following steps of: carrying out liquid-liquid extraction prurification on an extracting solution, wherein normal butanol or ethyl acetate is taken as an extraction solvent, and an acid water solution and an organic solvent are taken as purification extracting solvents; then, adding the purified solution to be detected and a saline solution containing Cl<-> to a nanogold colloidal solution or a nano-silver colloidal solution to obtain a mixed solution which is a final loaded detection solution; carrying out spectrum scanning on the detection reagent by the 785nm laser source Raman spectrum, wherein 707+/-4 cm<-1> is taken as qualitative feature peak displacement of the melamine; and carrying out normalization by taking 731+/-4 cm<-1> as corresponding peak intensity, and calculating the melamine content by taking 707+/-4 cm<-1> as corresponding peak intensity. The method provided by the invention can rapidly detect the melamine in the forage in situ.

The invention discloses initiative broad-spectrum lasting antibacterial and antiviral medical protective clothing, textile fabric and a preparation method thereof. The preparation method of the textile fabric includes the steps that nano-silver colloidal sol, an inorganic antibacterial agent and an organic antibacterial agent are matched into colloidal sol mixed liquor of a certain concentration;non-woven materials are dipped into the colloidal sol mixed liquor for a certain time; and the antibacterial and antiviral textile fabric can be obtained by means of drying, flattening and winding. The initiative broad-spectrum lasting antibacterial and antiviral medical protective clothing is made of the textile fabric prepared through the method. A traditional metal ion antibacterial and antiviral technology, an organic matter antibacterial and antiviral technology and a photocatalyst antibacterial technology are combined, the lasting and effective broad-spectrum antibacterial and antiviralproperties are given to the medical protective clothing while breathability is not influenced, and the antibacterial rate reaches 99% or above; and moreover, the fast killing effect on influenza viruses (H1N1 and H3N2) is good, the antiviral activity rate reaches 99% or above, and washing reutilization can be achieved.

The invention discloses a method for preparing nano-silver water solution by modified glucose, which comprises the steps of: mixing 2-(3-carboxy-1-oxopropyl)amino-2-deoxy-D-glucose water solution with the mass percent concentration of 0.01-10% and reducing agent water solution with the mass percent concentration of 0.0001-10% with silver ammonia solution with the mass fraction of 0.01-100g/L according to the volume ratio of 1000: 1: 2-1: 1: 2, and stirring for 5-600min at the temperature of 10-90 DEG C to obtain nano-silver colloidal solution with the average particle size of 1-100nm. The method can be used for preparing the nano-silver colloidal solution by modified glucose 2-(3-carboxyl-1-oxopropyl)amino-2-deoxy-D-glucose, and the obtained nano-silver is even in particle size, good in dispersity, stable in performance and low in irritation to the human body, thus having better medical value.

The invention discloses a preparation method of a polysaccharide nano-silver colloidal solution. The preparation method comprises the steps of mixing a polydextrose solution with the mass percent of 0.001%-10% and a silver ammonia solution with the mass fraction of 0.01g/L-100g/L in a volume ratio of 1:(1000-1), and fully mixing the two solutions at 10-90 DEG C, thus obtaining the nano-silver colloidal solution with the average grain diameter of 1nm-100nm. According to the invention, the technical scheme is simple in process, polydextrose adopted by the method is high in safety for human beings, and the prepared nano-silver colloidal solution is good in stability, is small in grain size of nano-silver, has an excellent antibacterial effect, is good in affinity with cellulose fibers, can be used for disinfection of common object surfaces, skins and mucosa and preparation of silver-loaded antibacterial fibers or silver-contained viscose fibers as well as silver-contained antibacterial colloid, and the like.

Disclosed is a process for preparing an antimicrobial article, wherein a silver colloid is formed in situ as a result of the components employed. The process comprises the steps of (i) providing a liquid, which contains a soluble polar polymer in a solvent selected from certain polar organic solvents; (ii) adding a silver salt selected from alpha-functionalized silver carboxylates to said liquid; (iii) allowing the mixture to react with formation of a silver colloid; and (iv) separating the solvent from the mixture and forming of the antimicrobial article. The antimicrobial articles thus obtained may be sheets, films, fibres, coating layers, and especially membranes like a semipermeable membrane for ultrafiltration, water separation or gas separation.

The invention discloses a method for detecting the concentration and a speed of silver ions released in the nano-silver dissolution process. According to the method, step 10), a nano-silver colloidal solution coated with sodium citrate is centrifuged and redissolved, and existing silver ions in the solution are removed; step 20), the nano-silver colloidal solution without the silver ions is mixed with a Raman labeled molecule solution, and a to-be-detected sample solution is obtained; the volume rate of the nano-silver colloidal solution coated with sodium citrate to the to-be-detected sample solution is 1:10; step 30), the to-be-detected sample solution is taken and put in a closed quartz colorimetric dish, and a microscopy Raman platform is used for Raman testing; step 40), Raman data obtained in the step 30) are subjected to baseline correction, curve fitting and data processing, and the changing curve of the concentration of the silver ions released by silver nanoparticles along with time and the changing curve of the release speed of the silver ions along with time are obtained by the aid of mathematic plotting software. The content of the silver ions released in the dissolution process of nano-silver can be continuously detected with the detection method.

The invention discloses a preparation method of silver-containing hydrogel. The method comprises the following steps: dissolving ethylene glycol chitosan in a solvent to prepare an ethylene glycol chitosan solution; dissolving silver nitrate in water, then adding glucan to form a stable colloidal solution, and dropwise adding a trisodium citrate solution to prepare a nano-silver colloidal solution; dissolving oxidized dextran in water to prepare an oxidized dextran solution; and uniformly mixing an ethylene glycol chitosan solution with a nano-silver colloidal solution, then adding an oxidized dextran solution to carry out Schiff base reaction, and freeze-drying to obtain the silver-containing hydrogel. The hydrogel disclosed by the invention has a uniform porous net structure, shows excellent mechanical property and antibacterial property, slowly releases silver ions, can also load medicines such as deferrimine and the like, ensures that the medicines are slowly and efficiently released, promotes revascularization, shortens a wound healing period, and has a relatively good treatment effect on refractory wounds.

The invention discloses a preparation method of a sterilization material employing loofah sponge as a matrix. The method comprises the steps of adding chitosan to deionized water under an intense stirring state, dropwise adding glacial acetic acid for assisting in dissolution, hydrolyzing at room temperature for 4-8h, heating in a water bath at 50-70 DEG C, slowly dropwise adding a silver nitrate solution and heating to 75-85 DEG C for constant-temperature reaction for 10-14h to obtain a gold nano silver colloidal solution; peeling and denucleating loofah fruits, cleaning and drying, soaking the loofah in sodium hydroxide and triethylamine, and repeatedly cleaning until the pH is 7 to obtain modified loofah sponge; and soaking the modified loofah sponge into the nano silver colloidal solution, carrying out ultrasonic absorption as an assistant means, drying and repeatedly cleaning until no silver is washed out, and drying again to obtain the sterilization material. According to the method, the strong adsorption effect of the loofah sponge on an organic matter is skillfully utilized and the nano silver material is uniformly deposited on the wall of a vascular bundle of the loofah sponge; the preparation method is simple and easy to operate; and the prepared product is of an overall material, is easy to use, store and popularize, and is safe and nontoxic.

The invention discloses a green preparation method of nano-silver particles. The green preparation method of the nano-silver particles comprises the steps of mixing 1 to 20g/L of cubilose water solution and 0.01 to 100g/L of silver nitrate water solution, reacting for 100 to 600min at the temperature of 80 DEG C to 200 DEG C, and obtaining a nano-silver colloidal solution; and using ethyl alcoholand deionized water for repetitively washing, centrifuging, and drying to obtain the nano-silver particles. By adopting cubilose as a reducing agent and a stabilizer of the nano-silver particles, thegreen preparation method of the nano-silver particles provided by the invention has the advantages of simple process, mild reaction, green and environment protection.