76results about How to "Good size control" patented technology

The invention relates to the technical field of catalysts for gas purification, in particular to a hierarchical pore metal-based catalytic adsorbent as well as a preparation method and application thereof. The invention discloses an integrated preparation method combining a sol-gel method and a template method, which comprises the following steps of: adding a template agent before forming gel, adding a proper amount of ammonia water in an aging process, accurately controlling other reaction conditions and a raw material ratio, and controlling a spatial confinement effect of the template method and a chemical reaction in a sol-gel process to obtain a sol-gel composite material. The morphology and size of the catalytic adsorbent can be accurately regulated and controlled, the hierarchical pore metal-based catalytic adsorbent with a microporous structure as a main material and mesopores and macropores as coexistence is finally prepared, the hierarchical pore structure provides rich adsorption sites and catalytic activity centers, and the hierarchical pore metal-based catalytic adsorbent has high adsorption capacity, high selectivity, good catalytic activity, good stability and easy regeneration.

The invention discloses a preparation method of a high-entropy phosphide nanotube, which successfully prepares a nanotube phosphide with a high-entropy structure by adopting a hydrogen bond organic framework (HOF)-metal organic framework (MOF) template conversion method. In the preparation process of the material, a core-shell structure (HOF (MOF)) is firstly formed, the core gradually disappears through a diffusion mechanism, and finally, the material is converted into a hollow nanotube structure which is uniform and controllable in size. According to the hollow structure, the specific surface area is remarkably increased, more active sites are provided, the transmission path of reactant molecules is optimized, and the electro-catalytic performance is greatly improved. Besides, the overall tubular morphology of the material is uniform, the size is controllable, and compared with a traditional granular material, the specific surface area is remarkably increased, so that more reaction sites are exposed in the external environment, and the catalytic efficiency and the reaction rate of the material in an electro-catalytic reaction are greatly improved.

The invention provides a power module, which comprises a first side plate, a second side plate and an insulating plate, and is characterized in that the insulating plate comprises a flat plate part, one or more lug bosses and one or more communication bridges; the protruding part and / or the communication bridge protrude / protrudes in the third direction so as to form an insulation cavity. The insulating plate, the first side plate and the second side plate are combined to form a first accommodating space and a second accommodating space along a third direction, a first power device is arranged in the first accommodating space, and a second power device is arranged in the second accommodating space; the transformer comprises a magnetic core and a winding wound on the magnetic core, the winding comprises a first winding and a second winding, and at least part of the magnetic core is arranged in the insulation cavity or the communication bridge; the first winding is electrically connected with the first power device, and the second winding is electrically connected with the second power device. The flat plate part does not penetrate through the magnetic core air gap, so that the size of the magnetic core air gap is convenient to control, and the efficiency of a transformer in the power module is improved.

The invention discloses a three-dimensional woven composite material plate spring type undercarriage prefabricated body profiling forming tool and method. The three-dimensional woven composite material plate spring type undercarriage prefabricated body profiling forming tool comprises a tool frame, a core mold, five clamps and five connecting rollers. The three-dimensional woven composite material plate spring type undercarriage structure prefabricated body comprises nine areas including a first uniform cross-section area, a first variable cross-section area, a second uniform cross-section area, a second variable cross-section area, a third uniform cross-section area, a third variable cross-section area, a fourth uniform cross-section area, a fourth variable cross-section area and a fifth uniform cross-section area, vertical parts are arranged on the two sides of a plate spring, an arc part is arranged in the middle of the plate spring, and the plate spring is of a symmetrical structure. The thicknesses of the fabrics in different areas are different, variable-thickness integrated weaving is adopted in the weaving process, and the fabric areas comprise binding warp yarns and weft yarns. The defects that an existing undercarriage prefabricated body is woven in blocks and cannot be integrally formed can be overcome, better size control and good mechanical performance are achieved, the three-dimensional woven composite material is adopted, and the undercarriage prefabricated body has the advantages of being large in specific stiffness and high in specific strength and further has excellent layering resistance and impact resistance.

According to the preparation method of the high-temperature-ablation-resistant heat-insulation aerogel, a plasticizer polyethylene glycol is introduced into a graphene and silicon dioxide dispersion liquid for composite film laying, then a solvent plasticizing foaming technology is utilized for preparing the composite aerogel, and the prepared aerogel has the ablation-resistant function and the excellent heat insulation function; and meanwhile, the material has the advantages of light weight, good compression resilience and the like, and can be repeatedly used by maintaining the original shape and performance at high temperature. The scheme has the advantages of simple process, controllable process, low reaction conditions, suitability for industrial production and the like.

The invention provides composite silver soldering paste and a preparation method and application thereof.The preparation method comprises the following steps that silver nitrate and PVP are dissolved in an ethylene glycol solution, and stirring is conducted for 20-45 min through a constant-temperature magnetic stirrer at the temperature of 45-75 DEG C; adding a certain amount of HCl into the mixed solution, magnetically stirring for 15-30 minutes, and cooling to room temperature; putting the mixture into a reaction kettle, and performing vacuum constant-temperature heating for 150-200min at 100-190 DEG C; and after washing with deionized water and absolute ethyl alcohol, carrying out ultrasonic treatment to obtain the composite silver soldering paste. According to the multi-scale composite silver soldering paste, an ethylene glycol reduction method is adopted, silver ions in a solution are reduced into silver atoms, submicron or micron particles are secondarily grown on the basis of nano-silver particles, and the multi-scale composite silver soldering paste is prepared and has better electrical and mechanical properties; the multi-scale silver particles are easy to generate, the reaction conditions are easy to control, the preparation method is simple, safe and environmentally friendly, the needed raw material types are few, the number of devices is small, few organic matter is added, and the nano-silver particles controllable in morphology and size are easy to obtain.

The application belongs to the technical field of optical materials, and particularly discloses a synthesis method of core-shell quantum dots based on surface activation, which comprises the following steps: S1, preparing a quantum dot core; S2, degassing reaction is carried out on zinc precursor, octadecene and oleylamine in proportion, then the quantum dot core obtained in S1 is injected, a metal alkyl compound is added, and the temperature is increased to 230-250 DEG C; S3, the shell precursor is injected for 3-4 times, the temperature is increased at the same time, the inner shell is grown, zinc stearate and TOP-S are injected again, the ZnS shell is grown, and the InP core-shell quantum dots with regular morphology are obtained. The synthesis method of core-shell quantum dots based on surface activation is adopted, the quantum dots with controllable morphology and size distribution are obtained, the method is suitable for industrial production, and has wide applicability.

This invention discloses a Pickering emulsion based on silk fibroin self-assembled particles and its preparation method. The preparation method includes the following steps: adjusting the pH of the silk fibroin solution to 4.0-4.5, adding NaCl to a final concentration of 0.05-0.1 mol / L, mixing, and then heating to 40-50 °C and allowing it to stand at a constant temperature. Using the obtained silk fibroin self-assembled particle dispersion as the aqueous phase and vegetable oil as the oil phase, the mixture is mixed with excipients and homogenized by high-speed shearing to obtain a primary emulsion. This primary emulsion is then treated by high-pressure microfluidic jet to obtain the Pickering emulsion based on silk fibroin self-assembled particles. This method requires no chemical modification or exogenous reagents, is green and simple, and does not use organic solvents. It can prepare emulsions with high biosafety and high storage stability without emulsifiers, improving process safety and scalability, and broadening its application in the food, cosmetics, and biopharmaceutical fields.

This invention provides a wireless, passive force-position implantable growth monitoring system and its fabrication method for early-onset scoliosis correction. The system includes: a connected compressible capacitive sensor and a flexible wireless antenna coil; the compressible capacitive sensor is connected to a self-growing early-onset scoliosis correction implant growth rod, and the flexible wireless antenna coil is disposed within the body. The compressible capacitive sensor and the flexible wireless antenna coil together constitute an LCR resonant circuit; the compressible capacitive sensor monitors the pressure changes caused by the elongation of the self-growing early-onset scoliosis correction implant growth rod during tissue or bone growth, thereby causing changes in capacitance and resulting in changes in the resonant frequency of the LCR resonant circuit; the resonant frequency change is detected and read out wirelessly via an external readout device. This system is designed to meet the needs of digital rehabilitation, requires no internal power supply, and has a stable structure, making it suitable for growth monitoring after early-onset scoliosis correction surgery.

The application provides a preparation method and a centering device of a size-controllable ultrathin high-quality echo wall optical crystal microcavity, and the method comprises the following steps: cutting a crystal material into a wafer and grinding and thinning the crystal thickness by using a polishing disc; placing an optical crystal microcavity blank on a microscope stage, adjusting two-dimensional adjustment knobs of the stage, and making the center of the optical crystal microcavity blank coincide with an origin of an objective micrometer scale; making a clamping rod with an adhesive adhered to a bottom end penetrate a top end through hole of a clamping rod fixing frame, and making the clamping rod align with the origin of the objective micrometer scale; adjusting the height of the clamping rod, making the optical crystal microcavity blank be pasted and fixed on the bottom end of the clamping rod by ultraviolet curing glue, and completing centering; taking the clamping rod off the clamping rod fixing frame, chamfering an outer circle of the optical crystal microcavity blank; grinding the outer circle surface of the optical crystal microcavity wafer by using sandpaper; polishing the optical crystal microcavity wafer, and obtaining the optical crystal microcavity based on the polished optical crystal microcavity wafer.

The invention relates to a VOx nanoring for a lithium ion battery negative electrode material, a preparation method of the VOx nanoring, the lithium battery negative electrode material and a lithium battery. The preparation method comprises the following steps: S100, preparing raw materials: preparing sodium orthovanadate and thioacetamide; s200, mixing the raw materials to obtain a mixed solution; s300, carrying out heating reaction to generate turbid liquid with a stable nanometer annular structure; and S400, cooling and separating, namely taking out the turbid liquid in the high-pressure kettle, cooling to room temperature, separating by a centrifugal machine, cleaning and drying to obtain the dry nanoring capable of being used for the lithium battery negative electrode material. The preparation method disclosed by the invention is convenient, simple, good in repeatability, high in yield and capable of realizing large-scale production and industrialization. The prepared nanoring structure can be kept stable for a long time, the size and morphology of the nanoring are controllable, and the morphology can be regulated and controlled through the reaction time, the reaction temperature, the reactant ratio and the like.

The present invention discloses a stop device of an electronic expansion valve and a method for installing a stopper. The stop device of the electronic expansion valve includes a core shaft, a stop ring and a stopper. The stop ring is sleeved on the core shaft and can be spirally rotated along the axial direction of the core shaft; a plurality of grooves are provided on the side wall of one end of the core shaft along the radial direction of the core shaft; the stopper includes an annular block, a plurality of protrusions and a stopper; the annular block is sleeved on one end of the core shaft with the groove; one end of the plurality of protrusions is fixed on the inner side wall of the annular block close to the core shaft, and the other end of the protrusion is inserted into the corresponding groove; the stopper is fixed on the outer wall of the annular block away from the core shaft and has a plane one; the plane one is used to stop the rotation of the stopper ring. In the present invention, since the stopper is used to stop the stopper ring, the top end of the elastic member is not subjected to the stopping force and the stopping force is only borne by the stopper alone. The elastic member will not be deformed, so as not to affect the sliding of the stopper ring.

A manufacturing method of a circuit board comprises the following steps that a first substrate is provided and comprises a first dielectric layer and a first copper layer, and the first copper layer is located on the surface of the first dielectric layer; cutting a part of the first dielectric layer along the direction in which the first dielectric layer and the first copper layer are stacked, so as to reduce the thickness of the first dielectric layer in a part of area, thereby forming a thinned layer; two blind holes are formed in the thinning layer, and the first copper layer is exposed out of the blind holes; forming a resistance layer in the blind holes and on the surface of the first dielectric layer between the two blind holes, wherein the resistance layer is connected with the first copper layer; and providing a bonding layer and a second substrate, arranging the bonding layer between the second substrate and the surface of the first substrate with the resistive layer, and pressing to form the circuit board. The invention further provides a circuit board.

The invention provides a preparation method of a PEM water electrolysis membrane electrode, which relates to the field of PEM water electrolysis hydrogen production. Titanium dioxide nanotubes are used as supporting materials to prepare an anode diffusion layer. Because the tube structure has high gas and liquid conductivity, it is beneficial to the separation of oxygen and water in the water electrolysis process. The titanium dioxide nanotubes are calcined at high temperature to transform into a rutile lattice structure, which has high conductivity and stability. The anode diffusion layer is prepared by stacking multiple thin single-layer supporting layers, and the porosity can be controlled within a suitable range. The anode diffusion layer has higher mechanical strength, plays a supporting role, meets the mechanical strength requirements of the water electrolyzer during operation, has higher porosity, and can effectively improve the transmission of water and gas between layers. The precious metal undergoes a solid phase reaction to be embedded in the surface of the rutile titanium dioxide nanotubes to form a dense catalytic conductive network structure, which is not easy to fall off, and can realize the batch preparation of membrane electrodes.

The invention provides a quantum dot, a preparation method thereof, a composition and a photoelectric device. The quantum dot comprises an inner core and a ZnSe shell layer located on the surface of the inner core; the ZnSe shell layer comprises at least four ZnSe single-layer structures, a ZnS shell layer can be further controllably grown on the surface of the ZnSe single-layer structures, surface ligands of the quantum dots comprise long straight-chain zinc carboxylate ligands, zinc carboxylate ligands containing branched chains and short straight-chain zinc carboxylate ligands, and the quantum dots are spherical quantum dots. The quantum dot provided by the invention is controllable in structure, shape and size and uniform in morphology, crystal face-ligand stress of the ZnSe shell layer is fully released, tensile stress generated by mismatching of core-shell crystal lattices of the quantum dot is obviously relieved, a core generates relatively weak compressive stress, and under the synergistic effect of surface ligands of the quantum dot, the quantum dot has a relatively strong compressive stress on the surface of the ZnSe shell layer. The quantum dot has the fluorescence (PL) quantum yield close to 100%, and the photophysical stability and photochemical stability are improved.

This invention discloses a method for preparing van der Waals metal thin films. The method includes the following steps: S1, coating a polyvinyl alcohol (PVA) film onto the surface of a supporting substrate; S2, depositing a metal film on the surface of the PVA film to obtain an intermediate; S3, placing the intermediate in water at 60-80°C to remove the PVA film, obtaining a floating metal film; transferring the metal film to the surface of a target substrate, and bonding the two together using van der Waals forces to obtain the final product. This invention utilizes the controllable dissolution properties of PVA, achieving the separation and transfer of the metal film from the supporting substrate using deionized water, avoiding the use of toxic chemical solvents and interface damage caused by high-energy bombardment. The method is simple, environmentally friendly, and can be widely applied to the preparation of van der Waals heterostructures such as metal-semiconductor and metal-insulator structures.

This invention discloses a core structure for a highly reliable electronic gear shifter, including a bracket, side plates, a toothed plate, and a shifting assembly. The shifting assembly includes a left shift block, a shift lever, a right shift block, steel balls, a locking plate, a locking spring, a gear position spring, and a sleeve. The shift lever is clamped and fixed by the left and right shift blocks. The cylindrical boss of the left shift block is tightly fitted with the inner hole of the large bearing, and the pin hole of the right shift block is tightly fitted with a pin, which is also tightly fitted with the inner hole of the small bearing. The locking spring and locking plate slide within the inner cavities of the left and right shift blocks, the steel balls and gear position spring move within the inner hole of the sleeve, and the steel balls and locking plates are slidably connected to the toothed plate. The unlocking lever slides within the shift lever. This invention enhances the shifting operation feel, increases the service life of the gear shifter, improves the strength and structural reliability of the gear shifter, and the locking function avoids the risk of misoperation.

The invention provides a preparation method of a porous electrode, the porous electrode and application of the porous electrode. The preparation method comprises the following steps: performing first etching on at least one surface of an electrode current collector to obtain an electrode current collector with holes; filling holes in the electrode current collector with a pore-filling agent, and performing second etching on a region, which does not contain the pore-filling agent, in the filled electrode current collector, so that the electrode current collector has surface pore-filling agent bulges, thereby obtaining a to-be-used electrode current collector; coating the surface of the to-be-used electrode current collector with electrode slurry to obtain a to-be-treated electrode; and removing the pore filling agent from the electrode to be treated to obtain the porous electrode. According to the preparation method provided by the invention, the preparation of the electrode with the low-tortuosity pore structure is really realized, so that the continuous batch preparation of the battery with the low-tortuosity electrode is realized, the operability and the high efficiency are realized, and the problem that the capacity, the rate and the cycle performance of the current thick electrode are relatively poor due to ion transmission limitation is solved.

The invention discloses a method for industrially producing nano-metal particles on a large scale, which comprises the following steps of: growing nano-metal particles on a graphene composite carbon fiber electrode in situ by adopting a direct current electroplating mode, and enabling the nano-metal particles deposited at a vertical graphene edge to fall off and sink by utilizing an ultrasonic vibration mode. The size of the metal nano-particles is controlled, the metal nano-particles fall off the surface of the electrode in time, and therefore continuous and large-batch production is achieved. The method for obtaining the nano-metal particles is carried out in a normal-temperature aqueous solution, the process is simple, energy is saved, consumption is low, and large-scale preparation of the metal nano-particles can be achieved; and no toxic or harmful gas is generated in the production process, so that the method is environment-friendly.

The present application relates to the technical field of medicine and chemical industry, in particular to a kind of alginate / nano lanthanum hydroxide composite microspheres and its preparation method and application.The composite microspheres use sodium alginate as organic matrix material, and nano lanthanum hydroxide as inorganic filling phase, which are prepared by electrospray technology, and can realize the uniform dispersion and wrapping of nano lanthanum hydroxide in alginate microspheres.The size of the composite microspheres can be adjusted as needed between 235.5 μm and 748.4 μm, and the mass ratio of alginate to nano lanthanum hydroxide can be adjusted as needed within 1: (0.5-1.5).The composite microspheres of the present application have a phosphorus binding capacity of 41.0 mg / g-90.0 mg / g in a gastric acid environment with pH=2, and excellent phosphorus binding ability, which can be used as an oral phosphorus binding agent for the treatment of hyperphosphatemia, providing a new technical solution for clinical intervention of hyperphosphatemia.

The invention relates to a 2D fluorescent flaky micelle and a preparation method thereof. The preparation method comprises the following steps: (1) synthesizing a block copolymer PCL-b-PDMA, a homopolymer PCL-SP and a homopolymer PCL-FL; (2) preparation of 1D seed micelles; dissolving the block copolymer PCL-b-PDMA in absolute ethyl alcohol, heating, cooling to room temperature, aging to obtain a polydisperse 1D cylindrical micelle solution, and placing the polydisperse 1D cylindrical micelle solution in an ice-water bath for ultrasonic treatment to obtain a monodisperse 1D cylindrical seed micelle solution; (3) preparing a 2D fluorescent flaky micelle; on the basis of PCL-b-PDMA, PCL-SP and PCL-FL, generating a 2D single-layer fluorescent flaky micelle or a 2D two-layer fluorescent flaky micelle in the seed micelle solution obtained in the step (2). According to the invention, the 2D fluorescent flaky micelle with controllable morphology and uniform size is successfully prepared, and a new scheme is provided for preparing a complex micelle with a fluorescent structure through crystal-driven self-assembly.

The invention relates to a titanium silicalite molecular sieve, a preparation method thereof and a method for preparing epoxypropane, and the method comprises the following steps: S1, mixing titanium silicalite molecular sieve raw powder, a first main binder, water, an optional first binder and an optional first surfactant, and carrying out first molding to obtain titanium silicalite molecular sieve microspheres; s2, mixing the titanium silicalite molecular sieve microspheres, a second binder, water and an optional second surfactant, and carrying out secondary molding to obtain a titanium silicalite molecular sieve precursor; s3, performing steam aging on the titanium silicalite molecular sieve precursor to obtain a titanium silicalite molecular sieve pre-product; and S4, carrying out roasting treatment on the titanium silicalite molecular sieve pre-product. The titanium silicalite molecular sieve prepared by the method disclosed by the invention has a porous structure and high mechanical strength, is used for propylene epoxidation reaction, and can obtain relatively high raw material conversion rate and target product selectivity.

The application discloses a kind of high-performance magnesium-lithium alloy materials, the high-performance magnesium-lithium alloy material is obtained by being compacted by magnesium-lithium alloy powder into mould, then sintering densification is carried out, in addition, the application also provides a kind of preparation method of high-performance magnesium-lithium alloy material, comprising the following steps: one, Mg-8Li-9Al-1Zn alloy powder is weighed and loaded into mould;Two, the powder in the powder loaded mould is compacted;Three, the mould with compacted powder is sintered densification in vacuum, and high-performance magnesium-lithium alloy material is obtained in mould.The high-performance magnesium-lithium alloy material of the application uses Mg-8Li-9Al-1Zn alloy powder as raw material, is compacted by being loaded into mould, then sintering densification is carried out, process flow is short, cost is low, operation is simple, flexible, the obtained high-performance magnesium-lithium alloy material component is uniform, organization is small, and the organization, structure of material can be designed, easily controlled, and the compressive strength is greater than 500MPa.

The invention provides a method for continuously preparing nano-emulsion through a temperature-controllable low-power ultrasonic tandem jacketed glass emulsifier, and belongs to the technical field of nano-emulsions.The method comprises the following steps that 1, a water phase is prepared, specifically, a surfactant is added into deionized water, and the water phase is obtained; (2) preparing a pre-emulsion: adding the oil phase into the water phase to obtain an initial material, and then pre-emulsifying the initial material by adopting a high-speed homogenizer to form an initial emulsion; and (3) continuously preparing the nano-emulsion by using a temperature-controllable low-power ultrasonic tandem jacketed glass emulsifier to obtain the nano-emulsion. According to the method, the temperature is controllable, the transparent or semitransparent nano-emulsion which is small in particle size, has single dispersity and is stable for a long time can be continuously obtained under the conditions of low emulsifier input and mild emulsification, and the performance of the nano-emulsion is obviously better than that of nano-emulsions prepared by other high-energy emulsification methods.

The invention provides an application and method of a molecular sieve as a defoaming additive in hydrogen production by water electrolysis, and the method for hydrogen production by water electrolysis by using the molecular sieve as the defoaming additive comprises the following steps: mixing the silicon dioxide-based molecular sieve with an electrolyte by using the silicon dioxide-based molecular sieve as the defoaming additive, and carrying out hydrogen production by water electrolysis. The silicon dioxide-based molecular sieve is used as an additive for physical defoaming, the non-conductive solid small particles can be uniformly dispersed in the electrolyte, the original water electrolysis reaction system and ion transmission are not changed, and the silicon dioxide-based molecular sieve is only used as a physical means for assisting bubble separation in the bubble evolution process; the separation radius and separation time of bubbles are greatly reduced, mass transfer overpotential of hydrogen production by water electrolysis is reduced, and contact between water in a reaction area and a catalyst is promoted, so that the energy conversion efficiency is improved, the water electrolysis potential is reduced, and the hydrogen production efficiency is improved. Moreover, the silica-based molecular sieve is controllable in size, firm in structure and low in cost, and the cost of hydrogen production by electrolysis of water can be effectively reduced.

This application provides a brush structure and a conductive slip ring. The brush structure includes: N sets of brush components, each set capable of clamping a corresponding rotor; each set of brush components consists of M brush filaments, and each brush filament is configured as a U-shape with an opening; the opening of the brush filament has a preset first dimension, and the track groove has a preset second dimension in the radial direction of the rotor; the first dimension can be configured according to the second dimension to provide a tension force for clamping the rotor when the brush components clamp the rotor; a base and N flow guides, each flow guide having at least a portion embedded in the base, and each brush filament having at least a portion disposed on the base; at least a portion of the flow guides is welded to at least a portion of the brush components; N is a positive integer not less than 1, and M is a positive integer not less than 1. This brush structure has the advantages of simple manufacturing process, convenient dimensional control, and low cost.

The application discloses a kind of assembled friction type holographic energy dissipation damping structures with tenon-mortise structure at component end, including prefabricated frame beam slab column, holographic substructure prefabricated beam column, prefabricated beam column node connector, substructure prefabricated beam column node connector, beam end tenon-mortise connector, beam interconnection and plate beam connection tenon-mortise structure.Prepared frame beam slab column is connected by prefabricated beam column node connector, beam end tenon-mortise connector and plate beam connection tenon-mortise, modularization is conveniently installed, and beam end friction deformation and bending energy dissipation are simultaneously enhanced.Holographic substructure prefabricated beam column is connected by substructure prefabricated beam column node connector, and substructure beam is connected with main body prefabricated beam middle section by beam interconnection, under the action of multi-dimensional excitation of building structure system, substructure is first energy dissipation, and the damage of excitation to main body structure is reduced.The holographic energy dissipation damping structure is prefabricated in factory, quality is controllable, installation is convenient, and construction period and budget are greatly reduced.

The invention relates to hydrogel based on an ice skeleton and a preparation method thereof, in the method, the ice skeleton is used as a template guide, a 30wt% PVA solution is poured and filled into the ice skeleton at the temperature of-4 DEG C to-6 DEG C, the ice skeleton is frozen at the temperature of-18 DEG C to-22 DEG C, then the ice skeleton is dissolved and removed at the temperature of 20 DEG C to 30 DEG C, and the hydrogel with a preset three-dimensional directional microstructure is obtained. According to the preparation method, an ice skeleton is used as a process route of template guiding, PVA solution filling, freezing shaping and ice melting demolding, the obtained hydrogel has a regular three-dimensional directional microstructure, the mechanical strength and the structural stability of the hydrogel are superior to those of random porous hydrogel, the technical problem that in a traditional method, biotoxicity residues exist or demolding is difficult is solved, and the preparation method is suitable for large-scale industrial production. The high biocompatibility, the high integrity and the accurate regulation and control of the orientation and the size of the hydrogel are realized.

The invention belongs to the technical field of preparation of inorganic non-metallic materials, and particularly relates to a preparation method of high-purity opaque quartz glass. The method comprises the following steps: by taking high-purity silica sol with impurity content of less than 1ppm as a raw material, compounding silica sol with various particle sizes in proportion, concentrating under reduced pressure until the content of silicon dioxide is 40-60%, adding an acrylamide gel enhancing system into the compounded sol, controlling the temperature to gelatinize the compounded sol, and preserving heat to improve the gel strength; and drying the wet gel at a low temperature of 60-80 DEG C and a relative humidity of 80-95% until the moisture content is less than 5%, then carrying out normal pressure dehydration, organic matter removal and presintering treatment on the dried gel blank, placing the presintered blank in a graphite container, and melting and preserving heat at 1400-1650 DEG C under the protection of nitrogen for 2-8 hours to obtain the non-quartz glass. And the pore size and density can be controlled by regulating and controlling the melting temperature and the heat preservation time. The total impurity content of the quartz glass prepared by the method is less than 5ppm, the structure is uniform, the density can be adjusted in a range of 1.8-2.1 g / cm < 3 >, and the quartz glass has good shading and heat-insulating properties.

The invention discloses a cellulose and zirconium phosphate composite gel material for a dialysis system and a preparation method of the cellulose and zirconium phosphate composite gel material, and belongs to the technical field of biomedical materials.The method comprises the steps that an ionic liquid solution of cellulose is prepared, then a zirconium phosphate material is added and stirred, and a uniformly-dispersed mixed solution is obtained; under the action of a precipitant, the mixed solution forms hydrogel or organogel; the hydrogel, the aerogel formed after the hydrogel is dried or the aerogel formed after the organogel is dried is used as the cellulose and zirconium phosphate composite gel material to be used in a dialysis system. The cellulose zirconium phosphate composite gel material is controllable in size and good in biocompatibility, can be conveniently loaded in hemodialyzers with different sizes, is used for dialysate regeneration type hemodialysis, can release captured ions under the action of a high-concentration salt solution or an acid solution, and is good in reusability.