6 results about "Material Pore Size" patented technology

The invention relates to the technical field of lithium battery negative electrode materials, in particular to a silicon-carbon composite negative electrode material with an exponential decay gradient silicon layer and a preparation method and application thereof.The silicon-carbon composite negative electrode material is formed by sequentially and alternately depositing multiple silicon layers and carbon layers on the inner wall of a porous carbon matrix pore channel from inside to outside, the thickness of the silicon layers meets the condition that i represents the number of layers, c represents the thickness of the first silicon layer, d represents an attenuation constant, i is larger than or equal to 2 and smaller than or equal to 10, c is 1-15 nm, d is 0.1-0.5, the thickness of the outermost silicon layer is smaller than 2.5 nm, and the thicknesses of the carbon layers are the same; the aperture of the silicon-carbon composite negative electrode material is satisfied; d0 is the initial aperture of the porous carbon matrix, N is the number of silicon layers, and TC is the thickness of the carbon layers. The pore diameter of the obtained product is gradually changed from inside to outside to realize a small orifice, so that the interface stability is favorably improved, the side reaction of electrolyte is reduced, and the first effect and cycle stability are remarkably improved.

The present application belongs to the technical field of material aperture testing, and particularly relates to a porous material aperture testing device and a use method thereof, which comprises a water supply assembly, a pressure supply testing mechanism, a workpiece self-locking mechanism, a circulating assembly and a main base plate, the water supply assembly comprises a water supply disc and a pressure sensor, the water supply disc is arranged on the main base plate, and the pressure sensor is arranged in the water supply disc. According to the flow calculation formula of the fluid in the pipeline, in combination with the relationship between the pipeline specific resistance and the pipe diameter, it can be concluded that in the relationship curve of the pressure difference and the square of the flow velocity, the inclination degree is mainly affected by the pipe diameter, and on this basis, the pipe diameter and the total cross-sectional area jointly affect the height of the curve. According to this phenomenon, in combination with the continuous measurement feature of the present application, a continuous pressure velocity relationship curve can be obtained, so that the small and dense holes and the large and sparse holes can be distinguished.

The invention provides a porous ceramic material prepared based on a high internal phase emulsion template method and a preparation method and application thereof. The porous ceramic material is prepared from the following raw materials: a high internal phase emulsion and an adhesive, the high internal phase emulsion comprises a continuous phase and a dispersed phase; the continuous phase is a ceramic precursor aqueous solution; the dispersion phase is an emulsifier oil phase solution; the volume fraction of the dispersion phase in the high internal phase emulsion is 74-95%. According to the preparation method, the size of emulsion droplets is accurately regulated and controlled through a high internal phase emulsion template method, and accurate control over the pore diameter of the ceramic material is achieved, so that the porous ceramic material has high porosity and high strength, and is stable in structure, controllable in average pore diameter and wide in application range.

This invention discloses a metal-organic framework composite material with adjustable pore size, its preparation method, and its applications. It relates to the field of functional material preparation technology and aims to overcome the shortcomings of existing metal-organic frameworks, such as low mechanical strength, difficulty in molding, and the structural damage and complex pore size control inherent in direct embedding of cellulose nanocrystals. The method includes: mixing an aqueous solution containing ferrous ions with an aqueous dispersion of cellulose nanocrystals to form a composite dispersion system; adding vegetable oil and emulsifying it through high-speed shearing and ultrasonication to form an emulsion template; adding an alkaline aqueous solution of trimesic acid to the emulsion template for in-situ coordination reaction; separating the solid and liquid components of the reaction product, washing, and drying; and adjusting the droplet size of the emulsion template by changing the concentration of cellulose nanocrystals to achieve control over the pore size of the composite material. This invention achieves precise control over the material's pore size, is environmentally friendly in the synthesis process, improves the material's mechanical strength and moldability, and provides stable adsorption of thymol, showing broad application prospects in areas such as fruit and vegetable preservation.

The utility model relates to the technical field of filter material production, and discloses a high-temperature-resistant filter material pore diameter testing device which comprises a base, a detection device body is arranged at the top of the base, a Y-shaped guide pipe penetrates through the top of the detection device body, a liquid inlet box penetrates through the top of the Y-shaped guide pipe, and two liquid inlets are formed in the top of the liquid inlet box. A driving mechanism is arranged at the bottom of the centrifugal mechanism and penetrates through one side of the base, a circular groove is formed in the inner side wall of the lower layer of the detection device body, a clamping mechanism is clamped in the circular groove, a liquid outlet is formed in the bottom of the detection device body, and a heating plate is arranged on one side of the liquid inlet box; the top of the lower layer of the detection device body is provided with an arc-shaped clamping block. The bottom of the upper layer of the detection device body is provided with a clamping groove. And when the spiral guide vane rotates, liquid centrifugally moves, then flows to the double-layer centrifugal disc and is centrifuged again, so that the liquid uniformly flows to the filter material, and detection data is more accurate.

This invention discloses a broadband silencer and pressurization system for pressurized buildings. The broadband silencer for pressurized buildings includes a functional pipe section and connecting pipe sections on both sides of the functional pipe section. The side of the functional pipe section closer to the pressurization equipment is its inlet direction, and the side farther from the pressurization equipment is its outlet direction. The functional pipe section is completely filled with multiple silencing sections along its length. Each silencing section is composed of a porous material, and the length of the silencing section gradually decreases from the inlet to the outlet direction, as does the pore size of the porous material. This broadband silencer for pressurized buildings, by completely filling the functional pipe section with porous material and employing the material's sound absorption principle, ensures a good silencing effect. Since this silencer is used in conjunction with pressurization equipment, the pressure loss caused by the porous material is negligible. Therefore, this silencer can ensure a good silencing effect in a small volume and achieve highly efficient silencing.