41results about How to "Adjustable porosity" patented technology

The invention relates to a variable-diameter spinneret and a processing device of hollow fiber membrane tows and membrane component. The variable-diameter spinneret comprises a central circular pipe,a middle circular pipe, an outer cavity and a first drive mechanism and is characterized in that the central circular pipe, the middle circular pipe and the outer cavity are sequentially arranged in asleeved manner, the first drive mechanism drives the middle circular pipe to vertically move, and the bottoms of the central circular pipe, the middle circular pipe and the outer cavity are parallelto one another. The variable-diameter spinneret has the advantages that a membrane filament obtained by regulating the position of the middle circular pipe comprises large-diameter membrane filament heads at two ends and a small-diameter membrane filament middle section, and the porosity of the membrane filament middle section can be regulated by controlling the diameter ratio of the membrane filament heads to the membrane filament middle section during subsequent binding and membrane component assembling to achieve the optional filling density rule distribution of the membrane component.

The invention provides a method for preparing a biological scaffold by 3D printing. The method comprises the steps of grinding allogeneic bones or heterogeneous bones at a low temperature in a freezing grinder to obtain a printing material, modeling 3D printing with the aid of a computer, and then performing post treatment in a genipin solution. The prepared biological scaffold has good biological compatibility, and the bone graft material does not have toxicity, rejection, mutagenicity or antigenicity in vivo, and does not disturb bone and tissue regeneration; the prepared biological scaffold can be gradually degraded and absorbed and replaced by autologous bone tissues, can bear the pressure close to 20MPa with normal bone cortex, and has good initial mechanical properties; and the elastic modulus is gradually reduced, stress shielding is avoided, fracture, collapse and loosening of implants in the long-term healing process are avoided, bone fusion can be accelerated, and the implants can be finally completely converted into autologous bone tissues.

The invention discloses a metal organic framework modified stannous sulfide composite photocatalyst as well as a preparation method and application thereof. The composite photocatalyst takes a metal organic framework MIL-53(Fe) as a carrier and is loaded with stannous sulfide. The preparation method of the composite photocatalyst comprises the following steps: mixing MIL-53(Fe) with stannous sulfide, adding solution containing S<2->, and carrying out precipitation reaction, so that the metal organic framework modified stannous sulfide composite photocatalyst is obtained. The composite photocatalyst disclosed by the invention has the advantages of environment friendliness, large specific surface area, many reaction sites, high photogenerated electron-hole utilization rate, high photocatalytic activity, good stability and corrosion resistance, and the preparation method has the advantages of simplicity in operation, low raw material cost, low energy consumption, short consumed time and easy-to-control conditions. The composite photocatalyst disclosed by the invention can be used for degrading hexavalent chromium wastewater, has the advantages of high degradation efficiency, simple application method, low cost and no secondary pollution and has a good practical application prospect.

The invention relates to a method for preparing a foamed glass insulation board by coal ash. The coal ash and glass powder are respectively put into a ball mill for dry grinding and iron in the coal ash is removed, the coal ash after iron removal, glass powder after grinding and sieving and cerium oxide are dryly ground to form mixed material, the mixed material is put into a steel mould to be pressed into a flat green body; and the pressed green body is put into an aluminum oxide sagger which is evenly spread with aluminium oxide powder at the bottom, put into a silicon carbon rod resistancefurnace to be sintered, cooled and annealed, thus obtaining the foamed glass insulation board. The coal ash is used for preparing the foamed glass insulation board in the invention, which is not onlybeneficial for saving natural resources and reducing production cost but also beneficial for environmental protection. The coal ash can be smashed without a high power crusher and is even in mixing; meanwhile the coal ash contains a great amount of hollow cenospheres and melikaria and has low heat conductivity and thermostability characteristics. The cerium oxide is used as foaming agent to causefoaming temperature to be easily controlled, so as to simplify technology and reduce energy consumption, thus being beneficial for industrialized production.

The invention discloses a VO2 film with a three-dimensional ordered porous network structure, and a preparation method and application thereof. The method stacks polystyrene microspheres on a glass substrate through a vertical immersion method, so that a die plate preparing a VO2 film can be formed; the die plate is immersed into a VO2 precursor solution, so that the slit between the polystyrene microspheres can be fully filled with V2O5 in the precursor solution; the V2O5 is converted into VO2 through follow-up drying and annealing process; the polystyrene microspheres are heated to evaporate, and the VO2 can form a three-dimensional ordered porous network shape; and the film has a complete three-dimensional ordered porous network structure. As the whole structure has holes, the holes canseparate fractures generated between VO2 particles on some frame, so that fracture force can be separated, and phase transition stress can be diluted.

The present invention provides a polyarylether ketone used for a lithium battery diaphragm and a lithium battery diaphragm comprising the polyarylether ketone. The polyarylether ketone includes the following structural unit: the structure of the chain link AR is: the present invention The provided lithium battery separator is prepared by coating polyaryletherketone on the surface of the ozone-modified polyolefin film, scraping the film, and phase inversion to obtain a lithium-ion battery separator, which has excellent thermal stability and electrochemical performance. The lithium-ion battery obtained from the battery separator has excellent comprehensive performance, and its discharge specific capacity, Coulombic efficiency and cycle stability are all significantly improved.