4 results about "Micropipe" patented technology

The application discloses a kind of peptide micropipe / In2O3 / Au composite gas-sensitive materials, its preparation method and application, belong to gas-sensitive material technical field.The material is self-assembled peptide micropipe (SPMFs) as three-dimensional support skeleton, by solution mixing and functional modification, make In2O3 nanoparticle uniform dispersion, Au nanoparticle surface load, form ternary composite system.SPMFs porous structure provides stable load platform for nanoparticle and accelerates gas diffusion, the LSPR effect of Au nanoparticle can enhance visible light absorption and surface reactivity, the heterojunction formed by In2O3 and SPMFs regulates electron transport.Under the synergistic effect of the three, material can detect ethanol at room temperature under visible light excitation, with high selectivity, high sensitivity and fast adsorption and desorption characteristics, detection lower limit is as low as 1 ppm, meet the demand of trace ethanol real-time monitoring.

The application discloses a neodymium-iron-boron magnet based on grain boundary diffusion for improving magnetic properties and a preparation method thereof. The preparation method comprises the following steps: mixing neodymium-iron-boron magnetic powder, a lubricant and nanotubes or micropipes to obtain mixed magnetic powder; performing orientation compression molding, isostatic pressing and vacuum sintering on the mixed magnetic powder to obtain a diffusion base material; cutting the diffusion base material according to size requirements, grinding off a surface oxide layer, and cleaning to obtain a cleaned base material; uniformly spraying an alloy diffusion source on the surface of the cleaned base material to perform grain boundary diffusion to obtain a magnet; and performing secondary tempering treatment on the magnet to obtain a grain boundary diffusion magnet. In the method, nanotubes or micropipes are added into the neodymium-iron-boron magnetic powder, diffusion channels penetrating through the grain boundaries are formed in the sintering process, and then the magnet is subjected to grain boundary diffusion by using a rare earth alloy diffusion source, so that the grain boundary diffusion depth of heavy rare earth elements is significantly improved, and the magnetic properties of the magnet are improved. The neodymium-iron-boron magnet prepared by the method has excellent performance.

The invention discloses a preparation method of a radial gradient ultra-fine grain magnesium alloy microtube with a functional coating. The preparation method comprises the following steps: (1) carrying out multi-pass progressive room-temperature rotary swaging deformation on magnesium alloy; (2) the magnesium alloy subjected to rotary forging is cut, and a pipe blank is obtained; and (3) the tube blank is subjected to multi-pass cold drawing after being drilled and supported by a core mold, and the radial gradient ultra-fine grain magnesium alloy microtube is obtained. And 4) constructing a biological coating on the microtube. According to the method, through the collaborative process of multi-pass gradual room-temperature rotary forging, drilling core mold supporting, multi-pass cold drawing and final water-cooling restraining recovery, a gradient structure from core ultra-fine grains to edge fine grains is actively constructed in the radial direction of the thin-wall magnesium alloy micro-tube low in rare earth content or free of rare earth; accurate regulation and control of strain distribution, grain evolution and structure stability of the thin-wall biological magnesium alloy microtube are achieved, controllable construction of hundred-nanoscale ultrafine grains is further achieved, and the gradient structure enables the magnesium alloy microtube to have high strength and good plasticity.

The application discloses a monoclinic phase BiVO4 micropipe prepared by a microwave radiation method and a preparation method thereof. Pure Bi(NO3)3.5H2O and NH4VO3 are used as reaction raw materials, distilled water is used as a solvent, polyethylene glycol (PEG-10000) with a molecular weight of 10000 is used as a surfactant, and a monoclinic phase BiVO4 micropipe material is prepared by using a microwave radiation technology. The microwave radiation process is simple in operation, energy-saving and environment-friendly, low in energy consumption, and energy-concentrated, and is favorable for improving a reaction rate and a synthesis efficiency of the BiVO4 material. The XRD and SEM analysis results of the product fully prove that the method can obtain the BiVO4 material with regular morphology and small particle size, is favorable for increasing active sites of the BiVO4 material, and thus improves the photocatalytic performance of the BiVO4 material. The target product BiVO4 material has the abilities of catalytic degradation of pollutants, catalytic photoelectrochemical decomposition of water and energy storage, and is expected to play an important role in the field of photocatalysis.