75results about How to "Adjust aperture" patented technology

The invention discloses a beta-FeOOH nanocrystal-loaded photocatalytic composite nanofiltration membrane and a preparation method thereof. The photocatalytic composite nanofiltration membrane is prepared by performing codeposition on dopamine and polyethyleneimine on a porous supporting membrane to form a crosslinking nanofiltration membrane with a separating surface layer first and then loading beta-FeOOH nanocrystals on the separating surface layer. The loaded beta-FeOOH nanocrystals can promote photocatalytic oxidation reaction in the presence of hydrogen peroxide to degrade organic pollutants in wastewater or attached to the surface of the composite membrane, so that not only is achievement of the completely-innocent treatment of pollutant-containing wastewater facilitated, but also the pollution of the membrane surface can be reduced to achieve self cleaning of the membrane surface, and thus the separating efficiency of the composite nanofiltration membrane is improved and the service life of the composite nanofiltration membrane is prolonged.

The invention relates to a surface modification method for a polytetrafluoroethylene separation membrane. The method comprises the following steps of: activating the surface of the PTFE (polytetrafluoroethylene) membrane by virtue of a plasma technology, and then continuously depositing thin oxide layers on the surfaces of pore channels of the separation membrane by virtue of an atomic layer deposition technology to realize precise adjustment and control on pore diameter and surface properties of the separation membrane. According to the method, the plasma technology is used for pretreating, and then the atomic layer deposition is carried out, so that the growth mechanism of a deposition layer on the surface of the PTFE membrane is changed, the island type growthof the deposition layer is changed to conformal growth, the deposition layer is uniform and smooth, and the hydrophily, the pure water flux, the separating property and the anti-pollution capacity of the separation membrane are all obviously improved.

A method for producing ordered anode alumina hole plate using anode oxidation bath, is characterized in that, includes the steps of: 1) taking out a substrate; 2) evaporating metal aluminium film on the substrate; 3) fixing the substrate with etal aluminium film in anode oxidation groove; 4) evaporating the substrate with etal aluminium film to anodize it in the electrolytic solution in anode oxidation groove; 5) placing the oxidated substrate into orthophosphoric acid solution, corroding and enlarging hole, and forming anode alumina hole plate.

The invention relates to a laser beam-expanding dodging device based on a microlens array and belongs to the field of laser beam expansion. The laser beam-expanding dodging device sequentially consists of a first level microlens array, an iris diaphragm and a second level microlens array which are located on a same straight line, and screen edges of the first level microlens array, an iris diaphragm and a second level microlens array are parallel to form a coaxial system, wherein the microlens element parameters of the first and second level microlens arrays are same, the microlens element diameter is p, and the rear focal distance of the microlens arrays is f; the diameter of the first level microlens array is D1, the maximum diameter of the iris diaphragm is D2, the diameter of the second level microlens array is D3, the distance between the two microlens arrays is d, and the distances from the iris diaphragm to the first and second level microlens arrays are respectively f and d-f. According to the dodging device provided by the invention, the microlens array replaces a single lens designed beam-expanding system, so that the aberration quality of a beam-expanding optical system is improved, the system structure is simplified, the beam-expanding ratio is improved and the precision demand on system adjustment is reduced.

The invention relates to an oil-absorbing resin and a preparation method thereof. The oil-absorbing resin comprises an oil phase: 5-15 parts of glycol dimethacrylate, 15-30 parts of isobornyl methacrylate, 20-40 parts of p-diphenyl sulfone methacrylate, 10-15 parts of triethylene glycol methacrylate, 10-20 parts of divinylbenzene, 20-30 parts of styrene, 50-200 parts of porogen, 0.5-2 parts of AIBN; and a water phase: 500-1000 parts of distilled water, 5-15 parts of PVA, and 20-50 parts of NaCl. According to the preparation method provided by the invention, the isobornyl methacrylate and the p-diphenyl sulfone methacrylate are used as main synthesis materials, and meanwhile, the non-polar crosslinking agents divinylbenzene and glycol dimethacrylate are used as crosslinking agents, and the styrene with higher hydrophobicity is used as a comonomer to synthetically prepare the oil-absorbing resin which can effectively absorb oil.

The invention discloses a formation method ofa through hole. The method comprises the following steps: a substrate is provided; photoetching processing is performed to the substrate to form a hole pattern with a first aperture; an additional dielectric layer is deposited; the substrate is etched, and a through hole with a second aperture is formed on the substrate. Through adopting the formation method of the invention, the formed through hole has the advantages that the size is even, the shape is regular, the adjustable range of the aperture is larger than usual, the controllability is higher, and the formation quality is higher.

The invention relates to a preparation method, a product and application of porous fibers with oriented pore structures. The preparation method comprises the following steps: 1) mixing a silk proteinsolution with a chitosan solution to prepare a mixed solution; 2) carrying out solution spinning on the mixed solution, carrying out directional freezing during spinning, and collecting fibers; and 3)freeze-drying the fibers to remove ice crystals to obtain the porous fibers with the oriented pore structures. According to the preparation method, by combining directional freezing and solution spinning, the pore structures of the obtained porous fibers are oriented, so that the porous fibers have excellent heat insulation performance and electric heating performance.

The invention relates to a bisamide chain organosilicon quaternary ammonium salt compound and preparation and application of the bisamide chain organosilicon quaternary ammonium salt compound and. The chemical structural formula (please see the formula in the specification) is provided, wherein X- is C1- or Br- or I-, m is any integer ranging from one to eighteen, and n is any integer ranging from one to five; the preparation comprises the steps of firstly, mixing N, N-double methylamine (3- aminopropyl) and fatty acid; secondly, adding solvent and performing temperature reaction to obtain a tertiary amine intermediate; finally, mixing the tertiary amine intermediate and halogen alkyl trimethoxysilane and performing temperature reaction; thirdly, the double amide chain organosilicon quaternary ammonium salt compound is obtained. The bisamide chain organosilicon quaternary ammonium salt compound can be applied to the preparation of hierarchical zeolite. The hierarchical zeolite prepared by the bisamide chain organosilicon quaternary ammonium salt compound can improve the pore volume and specific surface area of zeolite molecular sieve, effectively regulate the pore diameter and pore volume of hierarchical porous molecular sieve through changing the number of carbon atoms of double amide group chain, and further regulate and control the morphology of the hierarchical zeolite through the molar ratio of silicon dioxide in mother-liquid of quaternary ammonium cation surface active agents and the zeolite molecular sieve.

A method for sintering an anode block of a tantalum capacitor is characterized by including: placing tantalum anode block pressed by tantalum powder mixed with adhesive in a drying furnace filled with degreased solvent, performing airtight low-temperature solvent catalysis wet dewaxing, drying in vacuum and then performing vacuum sintering. The tantalum anode block obtained through the method maintains high specific surface area and high porosity, so that the tantalum anode block is high in specific capacity and low in leakage current, carbon content and oxygen content of the anode block can respectively drop to 0.005%-0.010% and 0.18% to 0.65%.

The invention relates to a preparation method for a silk fibroin three-dimensional porous scaffold and the silk fibroin three-dimensional porous scaffold prepared from the method. The preparation method comprises the following steps of preparing silk fibroin by degumming silk fibers; and dissolving the silk fibroin in a salt-acid binary solution and standing to obtain a silk fibroin solution, adding polysaccharides for dissolution and standing to obtain a silk fibroin and polysaccharide blending solution; preparing a silk fibroin hydrogel by dialysis of the blending solution; and freeze-dryingthe hydrogel to obtain the silk fibroin three-dimensional porous scaffold. The method is simple to operate, a process is short, the pore diameter of the prepared scaffold is adjustable, the scaffoldhas good mechanical properties and hydroscopicity, and a series of alternative materials can be provided for the field of biomedical materials.

A method for preparing nanometer porous pellumina which can regulate aperture and / or pitch of holes, which comprises the following steps: firstly, carrying out annealing and electrochemical polishing to an aluminum sheet, secondly, arranging the treated aluminum sheet in a constant-potential electrolytic cell, adding phosphorus acid solution as electrolyte, adding polyethylene glycol as adjusting agent, carrying out constant-potential anodic oxidation, then obtaining the nano-porous pellumina which can regulate aperture and / or pitch of holes, wherein the average molecular weight of polyethylene glycol is 400-2000, the mass percentage concentration n of the polyethylene glycol in the electrolyte is 0%<n<=50%, the concentration of the phosphorus acid in the electrolyte is 0.2-0.8 mole, and the electrolyzing time is 4-48h. Polyethylene glycol is adopted by the method as adjusting agent, effective adjusting to the aperture and the pitch of holes is realized, range of oxidizing electric potential is expanded through the chemical protection the electrochemical protection of polyethylene glycol, the used addition agent polyethylene glycol has the advantages of safety, environmental protection and low cost, therefore, the method is convenient to spread.

The invention discloses an adjustable plug-in slurry injector, and belongs to a slurry injector in the filed of distorted concrete slurry injection construction. The adjustable plug-in slurry injector comprises a slurry injection pipe, a conical head and a connector, wherein a slurry inlet of the slurry injection pipe is connected with the connector, a slurry outlet of the slurry injection pipe is connected with the conical head, slurry injection holes are formed at the lower portion of the slurry injection pipe and are arranged into a plurality of layers, the slurry injection holes of each layer are distributed evenly, and the layers are arranged in a staggered mode. The adjustable plug-in slurry injector is characterized in that the slurry injection holes are threaded holes, slurry outlet heads of different inner diameters are arranged on the slurry injection holes, or plugs are arranged on the slurry injection holes. The adjustable plug-in slurry injector has the advantages that the slurry injection holes are the threaded holes, the slurry outlet heads of different inner diameters are arranged on the slurry injection holes, and the hole diameters of the slurry injection holes can be adjusted as needed. The plugs are arranged on the slurry injection holes, the height and the quantity of the slurry injection holes can be adjusted as needed, the hole diameters of the slurry injection holes can be adjusted freely, so that distorted concrete slurry is injected conveniently and evenly, and construction quality is guaranteed.

The invention relates to a high-temperature heat insulation fire-resistant fiber, a fabric, a preparation method and an application. The high-temperature heat insulation fire-resistant fiber is a polyimide porous fiber and has an axial orientation hole structure. The preparation method includes the steps: 1) performing solution spinning on polyamide acid saline gel, performing directional freezingduring spinning and collecting frozen fibers; 2) freeze-drying the frozen fibers and removing ice crystals to obtain the porous fiber with the orientation hole structure; 3) performing thermal amidation on the porous fiber to obtain the polyimide porous fiber. The preparation method is simple and suitable for industrial amplification application and can realize continuous large-scale preparation.

The invention relates to the technical field of medical device design, and discloses a porous stent for bone repair. The porous stent comprises a plurality of structural units; the outer contour of each structural unit is in a regular quadrangular prism shape, the bottom side length of the regular quadrangular prism is a, and the height is h; each structural unit comprises supporting beam columns,a central beam column and connecting rods, wherein the supporting beam columns are arranged at the four side edges of the regular quadrangular prism respectively, the central beam column is arrangedat the center of the regular quadrangular prism and is parallel to and flush with the supporting beam columns, the connecting rods are correspondingly arranged between the supporting beam columns andthe central beam column, and the cross-sectional radius of the supporting beam columns and the cross-sectional radius of the central beam column are both R; the structural units are arrayed to form the porous stent. The invention also provides a preparation method of the porous stent for bone repair. The porous stent has the advantages of high porosity, low elasticity modulus, high bearing capacity and the like.

The invention relates to a preparation method, product and application of a radiation-proof porous fiber with an oriented pore structure. The preparation method comprises the steps that a spinning solution is prepared, wherein a radiation-proof filler is added during the preparation; spinning is performed through the spinning solution, wherein directional freezing is performed during spinning, anda frozen fiber is collected; ice crystals of the frozen fiber are removed. According to the method, by combining directional freezing and solution spinning, the porous fiber with the oriented pore structure is obtained; the radiation-proof filler is introduced in the preparation process, so that the fiber has excellent thermal insulation and radiation-proof performance.

Described is a method of preparing foams, wherein a suspension comprising an aqueous liquid, particles and at least one surfactant is provided, wherein the at least one surfactant at least partially hydrophobizes a surface of the particles, and wherein the suspension comprising the particles having the at least partially hydrophobized surface is foamed. The at least one surfactant is selected fromsurfactants having a backbone chain comprising at least nine carbon atoms, the at least one surfactant preferably being an amphiphilic molecule consisting of a tail coupled to a head group, wherein the tail comprises the backbone chain comprising at least nine carbon atoms.

The invention relates to a preparation method of a transparent mesoporous silica-alumina gel monolith, and particularly relates to a fast preparation method of a large-size flawless optical transparent mesoporous silica-alumina gel monolith with the mole ratio of Si / Al components more than or equal to 5, belonging to the technical field of inorganic porous materials. The fast preparation method regulates the mole ratio of Si / Al of a synthetic gel by introducing Al atoms, also strictly controls the range of the mole ratio of Si / H2O of a synthetic system and ensures that a prepared wet silica-alumina gel can complete direct open transformation to a dried gel without generating flaws at higher temperature by being correlated with a system gelation method. The fast preparation method disclosed by the invention has the advantages of short synthesizing period, simple operation step, easiness for control, regular product shape, controllable size, good heat stability and transparence, wide application value in the field of development of novel optical devices, specific area of 340-800 m<2> / g of the mesoporous silica-alumina gel monolith obtained after removing a surface active agent template through roasting, pore volume of 0.3-- / 5 cm<3> / g, pore diameter of 2-4 nanometers, and wide application prospects on the aspects of catalyzation and separation.

The invention relates to a preparation method of foam concrete with adjustable pore characteristics, and belongs to the technical field of concrete. The foam concrete comprises an expansion and shrinkage material, cement and mixing water. The preparation method comprises the following steps: designing a mixing ratio, calculating and weighing the mass of each required material, carrying out pre-water-absorption treatment on the dry expansion and shrinkage material, stirring cement slurry, and uniformly stirring the expansion and shrinkage material subjected to the pre-water-absorption treatmentand the cement slurry to obtain the foam concrete. According to the invention, the problems of defoaming, pore structure, shrinkage cracking and foaming agent in the existing foam concrete preparation method can be effectively solved; during blending ratio design, the dry density, the designed pore diameter and the designed strength are taken as design indexes, the pore characteristics can be adjusted, the defect that the strength grade of the foam concrete cannot be controlled due to the fact that only the dry density is taken as the design index in an existing foam concrete mix proportion design method is overcome, and the produced foam concrete can meet the requirements for the dry density and the strength at the same time.

The invention provides a Pt-supported mesoporous polypyrrole nanoring catalyst and a preparation method therefor. The composition of the catalyst comprises a polypyrrole material and supported Pt nano-particles, wherein the supported mass percentage of Pt is 20%-50%; the polypyrrole support material has a hierarchical porous structure, namely a nanoring structure with an inner diameter of 200-500 nm and a wall thickness of 30-60 nm, and a mesoporous structure with an aperture of 2-10 nm in walls of pores. The process of the catalyst is simple, and the prepared polypyrrole material has a bigger specific surface area than polypyrrole prepared by an electropolymerization method, which can be applied to fields like gas sensing, catalysis and separation.

The invention discloses a three-dimensional porous micro-carrier scaffold and a method for preparing the scaffold by the aid of ionic additives. The method comprises the following steps of: 1) mixinga biological material with a buffer solution, adding an ionic pore-forming additive, and mixing to obtain a completely co-soluble premix solution; 2) mixing an organic solvent with a nonionic surfactant to obtain an organic phase solution, and pre-cooling the organic phase solution; 3) preparing an emulsion: mixing the premixed solution with a curing agent under a refrigeration condition to obtaina water phase solution; adding the water phase solution into the organic phase solution for emulsification to obtain W / O type emulsion droplets, and then carrying out a low-temperature light-shielding emulsification reaction on the W / O type emulsion droplets to obtain an emulsion; 4) sequentially removing liquid components from the emulsion, filtering out an organic phase by using a filter screen, and screening out liquid microspheres with particle sizes within a required particle size range, and 5) wetting the liquid microspheres with water, then freezing, and drying after freezing to obtaina three-dimensional porous micro-carrier. By the preparation method, the pore diameter of the three-dimensional porous micro-carrier can be adjusted.

The invention discloses a membrane element which comprises a filtering membrane and a membrane protective device, the filter membrane is provided with a raw water flow channel and a pure water flow channel which are mutually separated, the outlet of the raw water flow channel is located at at least one side edge of the filter membrane, the membrane protective device sleeves outside the filter membrane, the membrane protective device is provided with at least one opening communicated with the outlet of the raw water flow channel, and a fluid flowed from the outlet of the raw water flow channel is led out of the membrane protective device by the membrane protective device via the opening. The membrane element can reduce the deposition of pollutants at the outlet of the raw water flow channel of the filter membrane, and the service life of the membrane element can be effectively prolonged.

The invention belongs to the technical field of ceramic materials, and in particular relates to a method for preparing a large-aperture three-dimensional network SiC ceramic material. The method comprises the following steps of: mixing SiC powder and B4C powder; adding ammonia hydroxide, sugar, acrylamide, N,N-methylene bisacrylamide and water in a ball milling manner to form a SiC mixed slurry; adding a surfactant, a foaming agent hydrogen peroxide and an adhesive into the SiC mixed slurry, uniformly stirring, and adding an initiator gel for foaming to obtain foaming gel; insulating and sintering the foaming gel for 0.5-1 hour at 1,950-2,040 DEG C in an inert atmosphere to obtain the large-aperture three-dimensional network SiC ceramic material. According to the method, a macropore three-dimensional network silicon carbide can be prepared, the size of apertures can be controlled by controlling the concentration and dosage of polyvinyl alcohol, and the porosity and aperture can be controlled by controlling the dosage of the hydrogen peroxide solution, and the communication performance of macropores can be effectively improved by using the surfactant. The method is simple and reliable, does not need high fixed investment, and has an excellent application prospect.

The invention discloses a method for preparing a lithium-sulfur battery cathode Li2S / NCs composite material by activating and reducing lithium sulfate by using biomass wastes. According to the method of the invention, effective adjustment on specific surface area, overall pore volume, pore diameter, nitrogen content, Li2S particle size and Li2S content of the Li2S / NCs composite material is achieved by adjusting a proportion of Li2SO4 sources, the biomass wastes and nitrogen sources and controlling a heating rate and temperature during a calcining process. The method of the invention is simple and convenient in operation process, low in material price, environmental-friendly, and is a potential method for preparing the high-performance lithium-sulfur battery cathode material.

The invention discloses an alkali-resisting diaphragm material capable of rapidly absorbing liquid and a production method thereof. The method comprises the steps that cellulose triacetate is grafted to modified fiber, vinylon and tencel of a sulfonic acid group and a polyacrylamide wet strength agent, water is added, the mixture is mixed to be uniform, the product is diluted and thicken, molding, squeezing, drying, reeling, press polish management and other steps are carried out on a fourdrinier machine, and a paper functional material is obtained. The product has the advantages of being good in alkali resistance stability, high in liquid absorbing speed, small in shrinkage, long in working time and the like, is mainly applicable to a battery pack matched with a chemical power source and is short in activation time, and the service life of equipment is greatly prolonged.

The invention belongs to the field of preparation of mesoporous nanomaterials and particularly relates to a preparation method of a mesoporous metal composite oxide nanomaterial with adjustable aperture. The preparation method is implemented by the following steps: firstly, respectively weighing metal salt and an auxiliary, grinding, uniformly mixing the two substances and grinding again to obtaina mixture precursor; secondly, putting the mixture precursor in the first step into a high temperature furnace, and carrying out programmed temperature and heating in the atmosphere of air or nitrogen; then carrying out programmed temperature again and continuing heating and naturally cooling to obtain a head product; thirdly, washing and drying the head product in the second step to obtain a target product. The preparation method has the advantages of low cost, simple process, easiness in operation, wide aperture distribution range of the target product and large specific surface area.

The invention discloses novel filtering paper, which is prepared from the following raw materials by weight: 40-50% of coniferous wood fiber, 5-17% of PET fiber / PP fiber, 25-35% of PET fibrid and 8-20% of diatomite or bentonite. The invention further discloses a preparation method of the novel filtering paper. According to the invention, the filtering paper is simple and convenient in process, environment-friendly, low in quantification, small in filtering resistance, high in filtering precision and good in strength.

The invention provides a method for preparing a porous array polyethylene template. The method includes the steps that first, first-stage thermal stretch is carried out on a preformed bar in a drawing device, wherein the pre-formed bar is formed by polyethylene and polystyrene; second, prepared first-stage stretch composite filaments are closely packed and fixed; third, second-stage thermal stretch is carried out; fourth, third-stage thermal stretch is carried out after prepared second-stage stretch composite filaments are closely packed and fixed; fifth, slicing and dissolution treatment are carried out on the composite filaments. The pore diameter of the porous array polyethylene template can be adjusted between dozens of nanometers and dozens of micrometers, and the pore gap of the porous array polyethylene template can be adjusted between hundreds of nanometers and dozens of micrometers. According to the method for preparing the porous array polyethylene template, the structure size of the porous array polyethylene template can be adjusted and controlled, production cost is low, repeatability is good, and continuous production can be realized.

The invention discloses a preparation method of a graded pore activated coke with a needle-shaped mesoporous channel and an application of the graded pore activated coke in flue gas desulfurization. According to the method, needle-shaped nanometer Mg(OH)2 is used as a template agent and thoroughly mixed with a pulverized coal, and after drying, calcination is carried out in the nitrogen and carbondioxide atmosphere and then natural cooling to room temperature is carried out, and then magnesium oxide is removed by using hydrochloric acid to obtain the graded pore activated coke. The method uses the pulverized coal as the raw material and the needle-shaped nanometer Mg(OH)2 as the template agent to obtain the needle-shaped flat mesoporous channel, the graded pore activated coke is applied to flue gas desulfurization technology, an adsorption rate and a sulfur capacity of the activated coke can be improved, and the number of recycling is increased.

The invention provides a composite chromatography filtering membrane material based on nanofibers and polymer microspheres and a preparation method thereof. Mixing the PVA-co-PE nanofibers and the sulfonated polymer microspheres according to a preset mass ratio to prepare a suspension; then preparing the suspension into a fiber membrane material, and distributing the sulfonated polymer microspheres on the fiber surface and among fiber pores of the fiber membrane material to form a multi-level filtering pore structure, so as to synchronously improve the flux, the rejection rate, the filtering stability and the cation adsorption performance of the fiber membrane material. The nanofiber and the sulfonated polymer microspheres with higher content are compounded to prepare the membrane material, and the optimization of the membrane material structure is realized, so that the permeation flux is improved; meanwhile, the sulfonated polymer microspheres have excellent cation adsorbability, swelling property and good toughness, the strength of the membrane material is improved, and the membrane material can be applied to filtration and chromatography under high pressure, so that the filtration-chromatography efficiency and the filtration-chromatography stability are improved.