470results about How to "Repeatable" patented technology

A preparation method of a drug sustained-release stent includes a preparation stent, a drug sustained-release stent constituted by drug coating on the stent, and the drug coating of the stent is composed of the following steps sequentially: (1) the preparation of a sustained-release drug coating layer; (2) the coating of the sustained-release drug coating layer; (3) drying. The dosages of the drug components on the sustained-release drug stent of the invention are in line with the designed dosages, and the drug can be released according to the stipulated dosages in the stipulated time of the design requirements completely in vitro tests. The invention has good biocompatibility, low cost of spraying process, high yield, controllable thickness of the coating layer, and slow and stable drug release rate.

The invention discloses a preparation method of a water retention type proton exchange membrane for a fuel cell, including spraying a perfluorinated sulfonic acid resin solution on the surface of an expanded polytetrafluoroethylene micropore film; the method comprises the following steps: filling a perfluorinated sulfonic acid resin component and a silicon dioxide component into micropores of theexpanded polytetrafluoroethylene micropore film in an impregnating way; and controlling the exchanging thickness of a compound proton in a way of spraying the perfluorinated sulfonic acid resin component and the silicon dioxide component. The compound proton exchange membrane prepared by the method not only ensures the absorption capability of water but also reduces the total resistance of the compound proton exchange membrane because water retention components of silicon dioxide is distributed in a gradient way, has a water retention function, reduces the dependency of the proton exchange membrane fuel cell on a humidification system, can ensure the compound proton exchange membrane to normally work under a low-humidification environment, is easy to realize the large-scale production andhas uniform thickness, high humidity strength and good size stability.

The invention discloses an InN nanopillar epitaxial wafer growing on a Si substrate. The InN nanopillar epitaxial wafer comprises, from bottom to top, an Si substrate, an In metal nanometer microballon layer and an InN nanopillar layer. The diameters of In metal nanometer microballons in the In metal nanometer microballon layer are 20-70 nm. The diameters of InN nanopillars in the InN nanopillar layer are 40-80 nm. The invention further discloses a preparation method of the InN nanopillar epitaxial wafer growing on the Si substrate. The diameters of the nanopillars are uniform and meanwhile the technical problem of a large number of dislocations between InN and Si due to severe lattice mismatches between the InN and the Si is solved. Thus, the defect density of the InN nanopillar epitaxial wafer is greatly reduced, the radiative recombination efficiency of current carriers is effectively increased and the luminous efficiency of nitride devices like a semiconductor laser unit and a light emitting diode can be improved significantly.

The invention relates to a laser-cladding etching preparation method for a 3D-printing formed part. The laser-cladding etching preparation method comprises the steps that 1 powder is fed; 2, layered slicing treatment is performed; 3, layered laser cladding is performed; 4, layered multi-scale porous structure laser etching treatment is performed; 5, after all the above steps are completed, a worktable controls a laser device of a 3D printer, an inert gas shielding device and a powder feeder to be in a closed state, and abrasion resistance and / or lubricity detection are conducted on the finally formed part. The laser-cladding etching preparation method adopts the laser cladding for additive material manufacturing, is assisted by high-precision laser etching to manufacture special multi-scale porous surface structure parts, has the advantages that the machining time can be shortened, the operation efficiency can be improved, the abrasion resistance and lubricity of the formed parts can be wholly improved, the problem of poor lateral forming precision of the formed parts due to additive material manufacturing is solved, pore edge hardness is greatly improved, and the laser-cladding etching preparation method can be reliable in performance, stable in operation, free of noise and pollution in the actual application process and the like.