34 results about "Pore microstructure" patented technology

Capacitor anodes that include metallic columns formed on a substrate so as to form a porous microstructure and methods of making the anodes are described. The metallic columns can be distinct from one another and project outward from the substrate. Also described is the formation of the metallic columns on the substrate by vapor deposition, including glancing angle deposition (GLAD), and by etching a portion of a metal layer. High capacitance capacitors made from the capacitor anodes are also described.

The invention relates to a liquid crystal / polymer composite electric control dimming film and a preparation method thereof, the liquid crystal / polymer composite electric control dimming film comprises a liquid crystal material, a polymer matrix and two layers of ITO conductive films, the polymer matrix is of a porous microstructure and is clamped between the two layers of ITO conductive films, the liquid crystal material is dispersed in the polymer matrix to form liquid crystal microdroplets, and the liquid crystal microdroplets are dispersed in the polymer matrix. The liquid crystal microdroplets have a vertically oriented polymer network; the polymer matrix is prepared from a first polymerizable monomer through first-step photopolymerization or thermal polymerization, and the macromolecular network is prepared from a second polymerizable monomer through second-step photopolymerization or thermal polymerization. A two-step polymerization method is adopted, firstly, a polymer matrix of a porous microstructure similar to PDLC is constructed through first-step polymerization, then a vertically-oriented polymer network is constructed in liquid crystal microdroplets through second-step polymerization, and therefore the unique composite microstructure is achieved.

The invention relates to production of a porous microstructure using the high internal phase emulsion (HIPE) templating technology. The invented method involves subjecting an emulsion prepared by emulsification of two immiscible phases to forced sedimentation, such as subjecting the emulsion to centrifugation, so as to increase the volume ratio of the dispersed phase to the continuous phase to obtain a high internal phase emulsion (HIPE), following by curing the continuous phase, whereby the porous microstructure thus produced has an increased porosity.

The invention discloses a shock absorber piston valve structure, and relates to the field of shock absorbers. The shock absorber piston valve structure comprises a piston rod which is composed of a coaxial large-diameter section and journal section; a piston valve is arranged on the journal section of the piston rod and comprises a valve element which sleeves the journal section of the piston rod;the valve element is made of a porous material; a plurality of through holes I communicating with one another are formed in the valve element; oil cavities which are formed in the upper part and thelower part of the valve element separately can communicate with each other through the through holes I; a covering body covering the valve element is arranged on the valve element; and a plurality ofthrough holes II penetrating through the covering body in the axial direction are formed in the upper side and the lower side of the covering body. According to the shock absorber piston valve structure, the porous material is applied to a valve element structure of the shock absorber piston valve, irregular pore microstructures inside the porous material are utilized, so that energy dissipation is generated when compressed oil liquid flows through the pore microstructures, and damping force is generated; and a large number of pore structures on the surface of the porous material are utilized,the contact area of the porous material and the upper oil cavity and the lower oil cavity is increased, and therefore under the high-speed working condition, and the phenomena that the working characteristics of the shock absorber are distorted, and cavitation of the oil liquid is generated can be avoided.

A fluidic system having a first volume, a second volume and a membrane geometrically separating the two volumes, which has an open-pore microstructure for the passage of a first medium and a second medium. There is a contact angle (Θ) between the interface of the media and the pore surface. A first electrical field in the region of the membrane and a first electromagnetic radiation and a first heating of the membrane define a first state (Z1), in which the membrane is not wetted or is less wetted by the first medium and is more heavily wetted by the second medium such that a first contact angle Θ1>90° is formed between the pore surface and the interface. The first medium and the second medium and the pore surface have a surface energy of which at least one surface energy can be reversibly changed in such a way that a second contact angle Θ2<Θ1 occurs between the pore surface and the interface in a second state (Z2).

The invention discloses a magnetic composite oxide ceramic membrane with a self-hole-sealing structure and a preparation method. The method includes the following steps that (1), magnesium alloy is subjected to surface pre-treatment; (2), a strongly-basic composite electrolyte solution containing sodium silicate, potassium hydroxide and an iron complex is prepared; and (3), the magnesium alloy inthe step (1) is adopted as a matrix, connected with an anode of a direct current power source and put in a quartz reactor containing the electrolyte solution in the step (2), plasma electrolytic oxidation treatment is carried out, and the magnetic ceramic membrane with the self-hole-sealing structure is prepared on the surface of metal in situ. The component of the prepared membrane is MgO-SiO2-Fe3O4 composite oxide, and the magnetic composite oxide ceramic membrane has magnetism, the special self-hole-sealing micro-structure, good adhesive force and anti-corrosion performance and good application potential.

The invention discloses a mesh microstructure for high-viscosity liquid atomization and a manufacturing method thereof. The manufacturing method includes: making a mesh template, wherein the mesh template has an array of convex columns; forming a mesh material layer on a substrate; embossing the mesh template on the mesh material layer, wherein the The protrusion array is completely immersed in the mesh material layer, and the mesh material layer is solidified; the mesh template and the substrate are removed to obtain a vibrating diaphragm, wherein the vibrating diaphragm and the A mesh is formed at the position directly opposite to the array of protrusions. The mesh microstructure can realize atomization from low viscosity to high viscosity liquid at room temperature, and the atomization is sufficient, the volume of atomized droplets is small, the flow rate is large, the surface of the mesh is flat, strong and easy to clean, and the production method is stable and efficient. Easy to repeat.

A method for preparing a graphene / polyethylenedioxythiophene composite fiber assembly belongs to the field of materials and the field of electrochemistry. The composite material uses graphene oxide and PEDOT:PSS as raw materials, and co-assembles through hydrothermal reaction to form a double-network porous composite fiber. Compared with the prior art, the graphene / polyethylenedioxythiophene composite fiber assembly of the present invention fully considers the types of graphene precursors, and proposes a new design for the co-assembly of graphene and polyethylenedioxythiophene Based on this idea, the effective control of the porous microstructure and conductive properties of composite fibers has been realized. The composite fiber of the invention can be directly used as an electrode of a fiber supercapacitor, and can also be used as a highly conductive porous carrier to load other highly active materials. The method provided by the invention has the advantages of low cost, convenient operation, short production cycle and easy realization of industrialized production.

The invention relates to a method for separating rare earth elements from neodymium iron boron alloy scrap and directly preparing rare earth metal. The method comprises the following steps: the cut neodymium iron boron alloy scrap is directly used as an anode, the rare earth elements in the alloy are selectively dissolved by controlling the potential of the anode, and the neodymium iron boron alloy scrap is enabled to form an open-pore microstructure by controlling the current density of the anode so as to promote rapid dissolution of the rare earth elements in the alloy into an electrolyte; only rare earth ions and lithium ions exist in the electrolyte, the rare earth metal can be directly prepared through electrolysis. By the method provided by the invention, not only the rare earth elements can be effectively separated from the neodymium iron boron alloy scrap, but also the rare earth metal can be directly prepared; meanwhile, no gas is produced during an anode reaction, so that environment pollution caused by anode gas produced during the conventional rare earth metal production is avoided; the method has good environmental, social and economic benefits.

The invention discloses a 3D printed Ti-PDA-BMP-2 bone defect repair tissue engineering scaffold and a preparation method thereof. The 3D printed Ti-PDA-BMP-2 bone defect repair tissue engineering scaffold is prepared from Ti6Al4V powder through a 3D printing technology and has a controllable shape, a pore microstructure and controllable physicochemical properties. A biological factor BMP-2 with bone repair ability is bonded to the engineering scaffold through polydopamine on the fiber surfaces and is used for repair and treatment on bone defects. The engineering scaffold has the advantages ofsimple and reliable structure, controllable shape and microstructure, simple and efficient surface modification, reliable mechanical property, high biological activity and safety, convenient implantation, small trauma and low cost.

The invention discloses a photothermal evaporation surface, and a preparation method and an application thereof, and belongs to the technical field of solar photothermal utilization. The photothermalevaporation surface is formed by attaching porous microstructures, which are periodically arranged in an array, to the surface of a substrate, and every porous microstructure is a coffee ring-shaped structure formed by the accumulation of nanoparticles; and a micro-droplet generator is used to periodically arrange nanofluid droplets on the surface of the substrate in the array manner, and heatingis carried out to evaporate the droplets until dryness in order to form the coffee ring-shaped porous microstructures, periodically arranged in the array manner, on the surface of the substrate. The photothermal evaporation surface provided by the invention has a high photothermal conversion efficiency and can be repeatedly used, and the preparation method has the advantages of very small use amount of the nanofluid required for preparing the high-efficiency photothermal evaporation surface, low cost, and facilitation of industrial application.

The invention discloses a molding method for the surface microstructure of the metal cathode plate of a fuel cell. First, the precision design of the rollers of the mechanical and electrical system is carried out by using the micro-deformation method of the piezoelectric brake loading material, and then the research and development of the 200μm-level micro-groove equipment is completed. , to obtain a mechanical structure and a servo control system that meet its electromechanical precision; the present invention proposes a method for processing the pores of the double-layer cathode plate, and proposes a processing method for rolling heads that can suppress 200 μm-level pores, and finally the mechanical micro-rolling processing method Combined with real-time piezoelectric braking, the 200μm-level surface pore microstructure can be formed by one-time rolling, with high production efficiency, precise size control, and easy preparation of metal surface textures in large quantities.

The invention belongs to the field of flexible sensors, and discloses a polydimethylsiloxane film, a flexible capacitive sensor and a preparation method thereof. The sensor includes an upper electrode layer, an intermediate dielectric layer and a lower electrode layer, and the upper and lower electrode layers have the same structure. Both include a flexible base material and liquid metal embedded in the base material; the intermediate dielectric layer is between the upper and lower electrode layers, which has a multi-layer stepped mesoporous microstructure. Compared with the flexible capacitive sensor without the dielectric layer, The linearity of the flexible capacitive sensor is improved; when the sensor is subjected to pressure or is approached by a conductor, the pressure on the sensor or the distance between the conductor and the sensor is obtained by measuring the change of the capacitance of the sensor. The invention also discloses a preparation method of the sensor. Through the present invention, a flexible capacitive sensor based on a liquid metal electrode and a dielectric layer of a multi-layer stepped mesoporous microstructure is designed to realize high sensitivity of the flexible sensor.