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135results about How to "Increase the frequency of collisions" patented technology

Gas diffusion electrode and preparation and application thereof

A gas diffusion electrode includes a gas diffusion layer and a catalytic layer; the catalytic layer is composed of conductive polymer nanorods and a catalyst attached onto the conductive polymer nanorods; the conductive polymer nanorods in the catalytic layer is vertically grown on the surface of carbon powder particles of a microporous layer in situ to form a sea urchin-shaped structure in microscopic scale; the catalyst is attached onto the surface of the conductive polymer nanorods. Preparation of the gas diffusion electrode includes the steps: (a) preparation of the gas diffusion layer; (b) preparation of the conductive polymer nanorods; and (c) preparation of the catalytic layer. Compared with the prior art, the gas diffusion electrode has a certain network structure formed while the catalyst dispersion effect and the utilization rate are improved; compared with an array ordering structure completely vertical to a basal layer, the network structure enables the collision frequency of gas molecules and the catalyst to be increased; the MEA assembled by the gas diffusion electrode has the battery performance improved when having the same catalyst loading amount. The preparation method is simple and easy to implement and is suitable for mass production. The gas diffusion electrode produced by batch has relatively good consistency.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI

Platinum monatomic hydrogen oxidation reaction electrocatalyst based on reactant enrichment and preparation method thereof

The invention belongs to the technical field of electrocatalysts, and discloses a platinum monatomic hydrogen oxidation reaction electrocatalyst based on reactant enrichment and a preparation method thereof. The platinum monatomic hydrogen oxidation reaction electrocatalyst is a hollow core-shell structure electrocatalyst which is composed of monatomic distribution noble metal as a catalytic activity center and a porous nitrogen-doped hollow carbon shell, and has the noble metal loading capacity of 1-12%. The Pt1@PNC catalyst is finally prepared by preparing a Ptx < + >/SiO2 intermediate and a Pt1/SiO2@PNC intermediate. The preparation method disclosed by the invention is simple and convenient to operate and low in cost. The metal platinum in the prepared Pt1@ PNC catalyst is in a monatomic state and is uniformly distributed on the inner surface of the PNC, so that the adsorption and oxidation rate of hydrogen on the surface of a Pt1 active center is improved, and the Pt1@PNC catalyst shows excellent hydrogen oxidation reaction activity and stability under a relatively low potential. The catalyst is suitable for being applied to electro-catalytic hydrogen oxidation reaction and hydrogen evolution reaction as a catalyst.
Owner:中国人民解放军空军勤务学院

Method for preparing superfine flaky zinc-containing alloy powder by wet ball milling as well as product and application of superfine flaky zinc-containing alloy powder

The invention discloses a method for preparing superfine flaky zinc-containing alloy and an application of the superfine flaky zinc-containing alloy. Spherical atomized zinc-containing alloy powder, aball milling solvent, a grinding aid, a ball milling medium and a dispersant are added to ball milling tank in proportion, and the materials are subjected to wet ball milling under heating and temperature control conditions; and obtained ball-milled slurry is subjected to filtration, ultrasonic cleaning, rinsing and drying in sequence, and flaky zinc-containing alloy powder is obtained, wherein the flake diameter range of the powder is 8-20 micron, the radius-to-thickness ratio is (30-50):1, and the apparent density is 0.85 g/cm<3>-0.95 g/cm<3>. The prepared superfine flaky zinc-containing alloy powder has high flaky degree, high radius-to-thickness ratio, high covering power, smooth surface, low oxidation degree and good particle size distribution, and can be applicable to the productionfields of waterborne Dacromet coatings, inorganic waterborne zinc-rich aluminum paint and waterborne heavy anti-corrosion coatings with different specification requirements after treatment and classified screening.
Owner:湖南昊宏新材料科技有限公司

Light-controlled water-fertilizer integrated intelligent irrigation system for vegetable cultivation

The invention belongs to the technical field of agricultural equipment, and particularly relates to a light-controlled water-fertilizer integrated intelligent irrigation system for vegetable cultivation. The light-controlled water-fertilizer integrated intelligent irrigation system comprises a drip irrigation main pipe, a branch pipe, a return pipe, a water wheel chamber, a water wheel, a crushingbucket, a filter screen, a crushing knife, a hopper, a feeding tube, an electronic scale and a solenoid valve. The water wheel chamber is formed above the drip irrigation main pipe, and the branch pipe is communicated to the tangential direction of the side face of the water wheel chamber. The other end of the branch pipe is communicated with the drip irrigation main pipe. The bottom of the waterwheel chamber is communicated with the drip irrigation main pipe through the return pipe. The water wheel is rotatably connected into the water wheel chamber. The crushing bucket is fixedly connectedabove the water wheel chamber. The crushing knife is rotatably connected into the crushing bucket. The electronic scale is fixedly connected above the crushing bucket through a support. The hopper isarranged above the electronic scale. The water wheel and the crushing knife in the water wheel chamber are pushed to rotate through water flows, fertilizer is crushed and mixed by the rotating crushing knife in the crushing bucket before flowing into the water wheel chamber, the particle diameter of the mixed fertilizer is reduced, and the dissolution speed of the fertilizer in the water wheel chamber is increased.
Owner:杭州市临安区农林技术推广中心

Method for authenticating truth or falsity of polyurethane water-borne wood paint on the basis of nonlinear fingerprint graph

The invention belongs to the technical field of water-borne wood paint authentication, and particularly relates to a method for authenticating the truth or falsity of polyurethane water-borne wood paint on the basis of a nonlinear fingerprint graph. A water-borne wood paint sample is subjected to preliminary treatment to quicken the layering of sample emulsion, so that an organic phase and an inorganic phase are fully separated, and an emulsion breaking effect on samples is guaranteed; the method is convenient for subsequent detection; if acrylic acid water-borne wood paint is doped in the polyurethane water-borne wood paint, during detection, acrylic acid emulsion subjected to acidolysis in sulfuric acid solution generates acrylic acid with reducing properties; and the above products aremixed in a B-Z vibration system consisting of H+, BrO3, Mn2+ and acrylic acid, a sample to be authenticated and a standard sample are compared according to the extraction characteristic parameters ofthe nonlinear fingerprint graph, and the variety as well as the truth or falsity of the sample to be authenticated can be authenticated according to an integral similarity. In addition, the method hasthe advantages of being good in reproducibility, short in operation time, economic and the like, and is suitable to be widely prompted and applied in authentication fields of the polyurethane water-borne wood paint.
Owner:HANDAN COLLEGE

Electric flocculation membrane bioreactor

The invention discloses an electric flocculation membrane bioreactor comprising a reactor body, wherein a contact oxidation tank, a settling tank and a membrane biological reaction tank are arranged in the reactor body; a contact oxidation aerator and soft fillers are arranged in the contact oxidation tank, the membrane biological reaction tank is communicated with a filtration membrane group, the membrane extraction water outlet of the filtration membrane group is communicated to a pure water discharge pipe, a sewage input pipe is further arranged on the reactor body, at least one group of positive and negative flocculation electrodes is arranged in the reactor body, and the positive and negative flocculation electrodes are electrically connected with an electric flocculation power supply; the contact oxidation tank, the settling tank and the membrane biological reaction tank are mutually communicated in sequence, and a precipitate return pipe is arranged in the settling tank and / or the membrane biological reaction tank. The electric flocculation membrane bioreactor disclosed by the invention can not only effectively reinforce the aggregation state of activated sludge, but also improve the cell activity of the sludge bacteria, enhance the deoxidation and dephosphorization effects, alleviate the membrane pollution and improve the flux and prolong the service life of the membrane, thereby being capable of being widely applied in treatment of various of sanitary sewage.
Owner:DONGTAI CITY DONGFANG MARINE FITTING

Waterless airborne-dust processing apparatus used for building engineering

The invention discloses a waterless airborne-dust processing apparatus used for building engineering. The waterless airborne-dust processing apparatus comprises a housing, and has an ingenious structure to realize waterless processing, a water resource is saved, airborne dust on a building construction place is sucked in a purifying bin by a suction fan through an air-supply pipe, an electrostaticprecipitation net is arranged at the bottom of a material discharge canister, fine airborne dust particles are sucked in a suction housing, the large airborne dust particles in the housing are bumpedwith a sidewall of a dedusting pipeline in the purifying bin and then fall into a material-collection groove and are introduced into the material discharge canister, and then are discharged from thedischarge mechanism in the material discharge canister, dedusting efficiency is high, the dedusting pipeline is set as an U shape, a bump area of the airborne dust particles is increased, the airbornedust is introduced into the dedusting pipeline and then is intercepted, the intercepted airborne dust passes through a material-guiding pipe and then is introduced into a storage bin, the dedusting effect is increased, a heating wire at a flow deflector outside the dedusting pipeline is energized for heating air in the housing, the bump frequency of the airborne dust in air and the outer wall ofthe dedusting pipeline is increased, and the dedusting effect is increased.
Owner:郑东亮

Method for controlling molecular weight of linear polyphosphazene intermediate

The invention discloses a method for controlling the molecular weight of a linear polyphosphazene intermediate. The molecular weight of the linear polyphosphazene intermediate is controllable, and thelinear polyphosphazene intermediate with the specific molecular weight can be prepared according to subsequent substitution reaction requirements or application requirements of a polyphosphazene material. According to the method disclosed by the invention, a catalyst with a specific ratio, specific monomer concentration and specific reaction temperature are utilized to obtain the linear polyphosphazene intermediate with different molecular weights. By adopting a reaction control method, the common problems in an existing method that the control variable is single, control conditions are not comprehensive, the control effect is not stable and the like are solved. According to the method disclosed by the invention, the number average molecular weight of the linear polyphosphazene intermediate is controlled to be in three grades including 1*10<3> to 9*10<3>, 1*10<4> to 9*10<4> and 1*10<5> to 9*10<5>; specific polymerization conditions can be selected according to different substitution requirements or application requirements to prepare the linear polyphosphazene intermediate with the specific molecular weight; the method has important significance on application and production of polyphosphazene.
Owner:BEIJING UNIV OF CHEM TECH

Stainless steel wire cut shot rounding machine and rounding method

The invention discloses a stainless steel wire cut shot rounding machine and a rounding method, wherein the rounding machine comprises a shot blasting chamber and shot blasters arranged on the shot blasting chamber; the shot blasting chamber is internally provided with a protective plate. The stainless steel wire cut shot rounding machine is characterized in that the three shot blasters are respectively a first shot blaster, a second shot blaster and a third shot blaster, when the first shot blaster and the second shot blaster blast from top to bottom; the third shot blaster blasts from right to left; the blasting lines of the three shot blasters are crossed in one area which is a cut shot collision area; the shot blasting chamber is internally provided with an oblique protective plate below the short blasters, and the oblique protective plate is high in left end and is low in right end; projection is carried out along the normal direction perpendicular to the oblique protective plate, so that the cut shot collision area projects at the middle part or the middle upper part of the oblique protective plate. The stainless steel wire cut shot rounding machine and the rounding method, which are provided by the invention, are high in rounding efficiency, and the equipment loss is low.
Owner:山东开泰工业科技有限公司
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