39results about How to "Small size effect" patented technology

The invention discloses an impregnation preparation method of nanometer titanium oxide which takes shell powder as a carrier, and in particular relates to a reproducible porous nanometer titanium oxide powder which takes the shell powder as the carrier and the preparation method thereof. In the method, titanium oxide is loaded on a shell powder carrier by impregnation; firstly, alkoxide solution of titanium ester or titanium with appropriate concentration is prepared, then an activated shell powder carrier with certain proportion is impregnated in the alkoxide solution, then the obtained solution is stirred and stayed for a certain time, and treated by low temperature and abstersion pretreatment and finally roasted at high temperature, so the nanometer TiO2 forms high-strength bond with the shell powder and promotes the catalytic activity of the nanometer TiO2 at the same time. Impregnation can be conducted for a plurality of times to increase load. The nanometer TiO2 is characterized by small particle size, good compatibility with materials, high catalytic efficiency, good stability, good regenerability, and the like, and can be applied to the fields of plastics, rubbers, fibers, coatings, home electronic appliances, paints, ceramics, water and environmental manipulation, pharmaceutical and hygienic articles, etc. In terms of sources of raw materials and production technology, the preparation method not only reduces the production cost of the nanometer TiO2 catalyst but also is helpful for disposal of the increasingly serious environmental problems, thus bearing great environmental protection significance.

The invention supplies ethylene propylene terpolymer superfine fiber which includes fiber with 200nm-5000nm diameter and its non-woven fabrics or film. Its preparation includes the following steps: dissolving the ethylene propylene terpolymer in the solvent and cooling to room temperature; standing for 2-8 hours at room temperature; electrostatic spinning at 20-60 deg.C to make nanometer fiber; vacuum drying for 48h below 60 deg.C. The invention can be used in spinning, highly active medium separating, absorbing material fields etc.

The invention belongs to the field of fine chemical engineering, and particularly relates to a high-valence silver antibacterial agent and a preparation method thereof. The high-valence silver antibacterial agent is a silver-polyhexamethylene biguanidine complex with the electric potential zeta larger than 0. A metal part of the silver-polyhexamethylene biguanidine complex is Ag3+, and the antibacterial property of the complex is 200 times that of Ag+. A biological acceptable part is polyhexamethylene biguanidine (PHMB), compared with other guanidines with small molecular weights, the antibacterial property is good, the advantages are more obvious because of the synergistic antibacterial effect of PHMB and other antibiotics, and toxicity to cells and tissue of human bodies is smaller. The nanoscale or micron-size Ag(III)-PHMB complex high in antibacterial activity is prepared by means of reversed-phase microemulsion or the aqueous solution environment. On one hand, the Ag(III)-PHMB complex can reduce toxicity, and on the other hand, the metal part and the biological acceptable part achieve the synergistic antibacterial effect so that the antibacterial property of the antibacterial agent can be effectively improved. The antibacterial agent has a great significance in treatment of human epidermis infection.

The invention discloses a preparation method and application of water-soluble titanium dioxide nanoparticles. According to the preparation method, beta-cyclodextrin is used as an initial reaction material, a macroinitiator is synthesized by means of modification, a multi-arm star-shaped block copolymer is prepared by using an atom transfer radical polymerization (ATRP) technology and a technologywhich combines ATRP with 'click' chemistry, and the water-soluble titanium dioxide nanoparticles with uniform sizes and good dispersibility are prepared by taking the multi-arm star-shaped block copolymer as a monomolecular micelle template on the basis of a solution phase synthesis method. The titanium dioxide nanoparticles prepared by the preparation method are stable in quality, uniform in particle sizes, and can be stabilized at a nanoscale; the properties of the titanium dioxide nanoparticles can be effectively enabled to be exerted. The surfaces of the titanium dioxide nanoparticles aremodified, so that the titanium dioxide nanoparticles can be enabled to be evenly dispersed in water, and an aggregation effect is further avoided.

The invention relates to the field of anti-freezing solutions for vehicles, in particular to an anti-freezing solution for a low-temperature anti-rusting vehicle. The anti-freezing solution is prepared from following materials in parts by weight through uniform mixing: 1-2 parts of borax, 1-3 parts of Kathon, 1-3 parts of sodium nitrite, 0.2-0.4 parts of benzotriazole, 1-2 parts of triethanolamine, 5-10 parts of an aqueous graphene oxide solution, 40-65 parts of glycerin, 19.5-50.78 parts of purified water, 0.01-0.05 parts of fluorescent green and 0.01-0.05 parts of tributyl phosphate. The anti-freezing solution for the low-temperature anti-rusting vehicle is good in stability and resistant to low temperature, the applicable range of the anti-freezing solution is subzero 10 DEG C-subzero 40 DEG C, the boiling range is 106 DEG C-112 DEG C, and the anti-freezing solution is not prone to volatilization and cannot block pipelines; besides, a passivation protection film can be formed on the cooling metal surface to inhibit metallic corrosion.

The invention discloses a feed additive for a ewe. The feed additive comprises the following components by mass percent: 28-32% of hawthorn powder, 28-32% of eucommia bark leaf powder, 18-22% of gynostemma pentaphylla powder, 18-22% of ginkgo leaf powder and nano-zinc oxide accounting for 1-1.5% of the total addition amount of the hawthorn powder, the eucommia bark leaf powder, the gynostemma pentaphylla powder and the ginkgo leaf powder, wherein the hawthorn powder comprises hawthorn pulp powder and hawthorn kernel powder in the mass ratio of 3 to 1. According to the feed additive, the hawthorn powder, the eucommia bark leaf powder, the gynostemma pentaphylla powder and the ginkgo leaf powder are combined with a novel zinc source-the nano-zinc oxide capable of promoting nutrient absorption of the organism, and the mixture ratio is optimized by the functional complementation principle, so that the reproductive performance of the ewe can be improved. The feed additive does not contain antibiotics, is healthy and green, and is simple to prepare, lower in production cost and wider in application prospect.

The invention discloses a feed additive for a lamb. The feed additive comprises the following components by mass percent: 28-32% of hawthorn powder, 28-32% of eucommia bark leaf powder, 18-22% of gynostemma pentaphylla powder, 18-22% of poplar flower and nano-zinc oxide accounting for 1-1.5% of the total addition amount of the hawthorn powder, the eucommia bark leaf powder, the gynostemma pentaphylla powder and the poplar flower, wherein the hawthorn powder comprises hawthorn pulp powder and hawthorn kernel powder in the mass ratio of 3 to 1. According to the feed additive, the hawthorn powder, the eucommia bark leaf powder, the gynostemma pentaphylla powder and the poplar flower are combined with a novel zinc source-the nano-zinc oxide capable of promoting nutrient absorption of the organism, and the mixture ratio is optimized by the functional complementation principle, so that the production performance of the lamb is improved and the quality of lamb meat is also improved. The feed additive does not contain antibiotics, is healthy and green, and is simple to prepare, lower in production cost and wider in application prospect.

The invention discloses a sulfonic acid tetraphenyl porphyrin nano-fluorescent material and a preparation method thereof, which relate to a fluorescent porphyrin material and a preparation method thereof. The sectional shape of the material is of a rectangular sheet or strip or sheet and strip. The method comprises the following steps: preparing a TPRS alcohol solution first, preparing a TPPS nano-fluorescent material dispersion system, and obtaining a product through separation and drying. The material has smaller size and better photosensitivity, has good characteristics of a porphyrin monomer such as rigidity and flexibility, electronic buffer capacity, photosensitivity, high chemical stability, wide spectral response, and also has special properties after the nanometer treatment such as small-size effect, surface effect, quantum effect, interfacial effect. The method is simple, has low production cost, and is convenient for promotion and application. The material prepared by adopting the method can be widely used as markers, photosensitive materials as well as sensitive recognition elements and materials for constructing photoelectric devices, molecular devices and sensors.

The invention belongs to treatment and comprehensive utilization of three wastes and relates to a method for treating papermaking wastewater by adopting a nano chitosan composition flocculation system. Currently, most of flocculating agents for treating the papermaking wastewater are polymeric aluminum salts and cation polyacrylamide, the polymeric aluminum salts and the cation polyacrylamide have insufficient flocculation capability for pollution sources in the wastewater, and precipitates have defects of coarse particles, loosening and the like. Nano chitosan sol has a three-dimensional network conformation and has excellent flocculation characteristic. Compared with a composition of the polymeric aluminum salts and the cation polyacrylamide, the nano chitosan composition flocculation system has the advantages that the relative flocculation rate (percent) for the pollution resources in the wastewater is improved by 40 percent; in treated supernatant water, an SS (Suspended Solid) value is similar and a CODcr (Chemical Oxygen Demand) value and a BOD5 (Biochemical Oxygen Demand) value are reduced by 8 to 12 percent; and the treatment cost is only 26 percent of the treatment cost of the composition of the polymeric aluminum salts and the cation polyacrylamide. By microscopic observation, adsorption points are formed by flocculate in a fiber and chitosan sol network, fine particles are precipitated and the precipitation is compact. The nano chitosan composition flocculation system is a pure natural flocculation material with both high activity and biodegradability.

The present invention relates to a PCB laser drilling precision testing device, which comprises a test board. The test board is provided with a plurality of positioning holes and a plurality of test holes. The surface of the test board is attached with several sheets of rectangular kraft paper, each of which covers apertures of five test holes; and the five test holes are respectively located at the center and four corners of the rectangular kraft paper. Compared with high test cost of a professional testing device, the device can realize the precision test of a laser drilling machine at the cost of several sheets of kraft paper.

The invention discloses an artichoke polyphenol-chitosan nanoparticle starch gelatin composite film and a preparation method and application thereof. Natural edible bio-macromolecular chitosan capableof forming a film and polyphosphates are used for firstly preparing artichoke polyphenol-chitosan-polyphosphate nanoparticles, and then, the nanoparticles are added into starch and gelatin to preparethe artichoke polyphenol-chitosan nanoparticle starch gelatin composite film. The edible film obtained by the invention has good film forming characteristics, has good barrier property and tensile strength, has anti-oxidative and anti-bacterial effects, can be applied to packaging of fruits, vegetables and the like, is an innovative edible film, and belongs to an innovative food packaging technology.

The invention discloses metal powder and a preparation method thereof, and metal alloy and a preparation method thereof, and belongs to the technical field of alloy. The metal powder comprises aluminum alloy powder and niobium on the surface of the aluminum alloy powder, the particle size of the aluminum alloy powder is micron-scale, the particle size of niobium is smaller than or equal to 200 nm, and the mass of niobium is 1-3% of that of the metal powder. The preparation method of the metal powder comprises the step of mixing the aluminum alloy powder with the niobium to obtain the metal powder. The preparation method of the metal alloy comprises the following steps of heating and melting the metal powder, and solidifying and forming to obtain the metal alloy. The crystal grains of the metal alloy are isometric crystals, and the size of the crystal grains is 1-5 microns. The metal alloy prepared from the metal powder is fine in grain, and the problem of crack generation can be solved.

The invention relates to the field of fluorocarbon coatings, and particularly discloses corrosion-resistant strong-adhesion FEVE water-based fluorocarbon color paste and a preparation method thereof. The color paste is prepared from 50 to 60 parts of FEVE water-based fluorocarbon emulsion, 10 to 30 parts of deionized water, 3 to 15 parts of pigment filler, 0.5 to 2.0 parts of defoaming agent, 0.5 to 1.0 part of thickening agent, 0.2 to 1.0 part of dispersing agent, 0.5 to 2.0 parts of curing agent, 0.2 to 0.5 part of flatting agent and 3 to 5 parts of modified material; the modified material is a nano-hydroxyapatite-hyperbranched modified composite material, and the particle size of nano-hydroxyapatite is 2-100 [mu] m. The preparation method comprises the following steps: S1, grinding; s2, mixing; and S3, dispersing. The hyperbranched material is adopted to stabilize the nano hydroxyapatite particles, so that the adhesion performance of the FEVE water-based fluorocarbon color paste after coating is improved, and the corrosion resistance of the FEVE water-based fluorocarbon color paste is further improved.

The invention discloses a preparation method of oil soluble titanium dioxide nanometer particles. According to the method, beta-cyclodextrin is taken as a primary reaction material and is synthesizedinto a macroinitiator through modification; multi-arm star block copolymer is formed through a technology of combination of ATRP and click chemistry; the oil soluble titanium dioxide nanometer particles with uniform sizes and excellent dispersity, based on a solution phase synthesis method and taking the multi-arm star block copolymer as a unimolecular micelle template, are formed. The surfaces ofthe TiO2 nanometer particles are modified, the TiO2 nanometer particles can be uniformly dispersed in an oily solvent, and the occurrence of aggregation effect can be avoided. The formed nanometer particles are stable in quality, the particle sizes are uniform and can be stabilized in nanoscale, and that performance of the TiO2 nanometer particles is realized can be effectively guaranteed.

The invention discloses a preparation method of submicron potassium nitrate fiber. The preparation method is characterized in that potassium nitrate and nano silicon dioxide are used as raw materials,and a simple low-temperature solvent evaporation crystallization method is adopted to obtain the submicron potassium nitrate fiber crystal. According to the preparation method, the operation cost islow, the effects of being simple and feasible are achieved, the technical requirement is low, the high-purity small-particle-size submicron potassium nitrate crystal is prepared mainly by controllingthe concentration of a potassium nitrate solution, the nano particle content, the nano particle dispersion degree, the external environment temperature and the like in the crystallization process, moreover, the obtained crystal is bright in color, and is in a shape of the slender fiber with the diameter ranging within 0.4-2 microns in the aspect of the morphology, agglomeration is not prone to occurrence, and the obvious advantages are shown.