191 results about "Nanoporous" patented technology

The invention discloses a cellulose paper-based diaphragm for a zinc-iodine battery as well as a preparation method and application of the cellulose paper-based diaphragm. The diaphragm is of a three-layer composite structure and comprises a matrix layer formed by paper pulp fibers such as softwood pulp, hardwood pulp, bamboo pulp or straw pulp through a wet papermaking technology, and compact functional layers which cover the two sides of the matrix layer and are formed by oxidized nanocellulose (TOCN). The preparation method mainly comprises the following steps: preparing the paper-based diaphragm matrix through wet papermaking, coating the two sides of the paper-based diaphragm matrix with TOCN aqueous dispersion, and finally carrying out hot-pressing drying treatment to enable the three layers to be tightly combined. According to the invention, the nano aperture and the surface negative electricity functional group of the TOCN layer are utilized, so that physical blocking and electrostatic repulsion of polyiodide ions can be realized at the same time, and the shuttle effect is effectively inhibited; and the uniform pore channels can guide zinc ions to uniformly deposit and inhibit dendritic crystal growth. The diaphragm is green in raw material, simple in process and low in cost, and the cycle life and coulombic efficiency of the battery can be remarkably improved when the diaphragm is applied to the zinc-iodine battery.

The invention relates to a high-pressure hydrogen nano-pore permeability testing device and method based on double-chamber pressure balance, and belongs to the technical field of unconventional oil gas. The device comprises a high-pressure gas source, a pressurization module, a double-layer nested core reaction kettle module and a high-frequency data acquisition and safety monitoring module; by constructing a double-layer nested structure that inner cavity hydrogen is actively wrapped by outer cavity nitrogen and cooperating with an all-metal knife edge hard sealing device and a different flow pattern permeability calculation method, accurate measurement of the Ndarcy grade permeability of the compact cover rock is successfully achieved, the industrial pain point that a traditional device is inaccurate in measurement, unstable in measurement and unsafe is thoroughly solved, and the method is suitable for large-scale popularization and application. And key experimental technology guarantee and scientific data support are provided for closure evaluation of underground hydrogen storage engineering and exploration and development of natural hydrogen resources.

The invention provides a nano plugging agent for a high-temperature-resistant shale oil gas water-based drilling fluid and a preparation method of the nano plugging agent, and relates to the technical field of drilling plugging agents. The nano blocking agent for the high-temperature-resistant shale oil-gas-water-based drilling fluid is a nano composite precursor aqueous dispersion which is stable at normal temperature, and can be triggered under the underground high-temperature condition and generate in-situ reaction in shale pores and on the surface to form an organic-inorganic hybrid blocking film. According to the technology, a conventional chemical raw material is converted into a high-performance plugging material in a low-viscosity precursor underground in-situ film forming mode, the industrial problem of efficient plugging of shale nano apertures is solved, and the core advantage is that the problem of a traditional physical accumulation mode is solved; a compact and tough organic-inorganic hybrid plugging film is formed in pores through temperature triggering, and plugging is changed into repairing.

The invention relates to the technical field of environmental and biological analysis and detection, in particular to a method for extracting perfluorinated / polyfluorinated compounds based on confinement fluid. The method comprises the following steps: providing a multi-dimensional reticular nanopore material; growing mutually staggered carbon nanofibers on the surface of a substrate through a chemical vapor deposition method; loading a confinement fluid in a pore channel of the multi-dimensional reticular nano-pore channel material; contacting the material with a to-be-detected sample, and extracting; desorbing the extracted material by using a desorption solvent to obtain a desorption solution; and detecting the perfluorinated / polyfluorinated compounds in the desorption solution. A multi-dimensional net-shaped nano pore channel formed by mutual staggering of the carbon nanofibers provides a stable multi-dimensional micro-nano confinement space for confinement fluid. According to the structure, mass transfer and distribution of a target analyte from a complex matrix to a confinement fluid are greatly promoted, so that efficient enrichment of various perfluoro / polyfluoro compounds is realized, and the recovery rate and the detection sensitivity of the method are improved.

The invention belongs to the field of aerogel composite materials, and discloses a heat insulation and wave absorption integrated aerogel composite material which at least has a three-stage pore network structure, the secondary structure is a continuous carbon network and is loaded in pores of the primary structure; the tertiary structure is silicon oxide aerogel with nano pores, and is polymerized on the surface of the secondary structure and in the pores in situ. The aerogel composite material is low in heat conductivity coefficient, good in heat insulation performance, excellent in wave absorbing performance and high in mechanical strength. The invention further discloses a preparation method of the material, the carbon-silicon dioxide composite material prepared through sol-gel and supercritical fluid drying is low in aerogel density and small in pore diameter and has a good barrier effect on solid heat transfer and gas heat transfer, and the prepared composite material has low heat conductivity and good heat conductivity. The continuous carbon network endows the material with excellent wave-absorbing performance.

The application provides a preparation system and application of a nano-bubble liquid; the system comprises a first gas supply assembly, a second gas supply assembly, a first liquid device, a second liquid device, a bubble generator, a buffer and a booster pump; the first gas supply assembly provides mixed gas with a carbon dioxide to air volume ratio of 8:2 to a first spiral pipe, the second gas supply assembly provides air to a second spiral pipe, nano-pores are uniformly distributed on the surfaces of the two pipes, and a nano-level filter membrane is arranged at the inlet and outlet of the generator; the first liquid device injects a base liquid into a closed cavity of the generator, the generated solution passes through the second liquid device filled with a stable solution, and then is sent out through the buffer and the booster pump; the system can accurately control the proportion of bubbles, solves the problems of easy dissolution and agglomeration and dispersion of single carbon dioxide bubbles, and finally obtains a stable nano-bubble liquid.

This application provides a copolymer membrane, its preparation method, and its application. The copolymer membrane is a hydrophilic-hydrophobic or hydrophilic-hydrophobic-hydrophilic bilayer structure, wherein the hydrophobic ends are cross-linked by unsaturated bonds. This application uses thermal cross-linking to cross-link the hydrophobic ends of the bilayer structure through unsaturated bonds. This method improves membrane stability; it also immobilizes nanoporins within the membrane, increasing the bonding strength between the pores and the membrane and reducing the risk of nanoporin detachment; furthermore, it significantly reduces the need for light-transmitting materials for UV cross-linking, lowering costs; and it avoids the adverse effects of free radicals generated by chemical cross-linking on the porous proteins.

The application provides a preparation method of a two-dimensional layered silicate mineral film treated by a reducing modifier, which comprises the following steps: firstly, organic modification of a two-dimensional layered silicate mineral by a reducing ionic liquid; then, loading of the reducing modifier into the interlayer of the two-dimensional layered silicate mineral; and finally, construction of a two-dimensional channel by vacuum filtration to prepare a film with a thickness of 5-20 microns. The two-dimensional layered silicate mineral film obtained by the method has a large surface area and can effectively treat heavy metal Cr(VI). The construction of the two-dimensional channel provides a limited space for the reducing modifier to prevent oxidation and provides abundant sites for the oxidation-reduction reaction in the nanopore channel, and solves the problems of desorption difficulty and secondary pollution caused by the traditional adsorption method for treating heavy metals.

Described herein are a method (100) and a system (200) for the generation of a high concentration of nanobubbles by hydrostatic cavitation within a pressurised liquid. The method (100) includes: - applying a substantially transverse pressure (102) to a nanoporous conduit containing a liquid to compress the conduit and pressurise the liquid; wherein the compression is configured to force the liquid (104) within the nanoporous conduit into a plurality of connected nanopores within the inner surface of the nanoporous conduit; and - releasing (106) the substantially transverse pressure from the nanoporous conduit and depressurising the liquid to generate nanobubbles via hydrostatic cavitation within the liquid. The system (200) includes a reservoir (202) configured to store a liquid, a conduit (204) and a constriction device (206), preferably a peristaltic pump, configured to exert a substantially transverse pressure to the conduit (204) in order to pressurise the liquid within the conduit (204).

The application relates to a nanofiber membrane and a preparation method and application thereof, and the preparation method comprises the following steps: (1) mixing polyurethane, nano lanthanum oxide, a waterproof agent and a solvent to obtain a spinning solution; (2) preparing an electrostatic spinning membrane through electrostatic spinning of the spinning solution; (3) spraying a finishing liquid on the electrostatic spinning membrane, and then performing heating treatment to obtain the nanofiber membrane. The polyurethane is stretched into superfine fibers through the electrostatic spinning technology, and a superhigh porous membrane similar to a spider web is prepared, the porous membrane has billions of nanoholes per square centimeter of the membrane, the nanofiber membrane has high air permeability and waterproof and moisture permeability, and the fibers are bound through a fiber bonding point technology, so that the fabric has excellent washing resistance. The nano lanthanum oxide heating functional particles are added to endow the nanofiber membrane with heating and heat storage functions, and further improve the washing resistance of the fabric.

The invention discloses a micro-nano composite bi-pass aluminum oxide film with heterogeneous wettability as well as a preparation method and application of the micro-nano composite bi-pass aluminum oxide film. The preparation method comprises the following steps: carrying out single-side protection on a super-amphiphilic micro-nano composite aluminum oxide film, and then removing the aluminum oxide film on the unprotected side; etching to remove the unreacted aluminum substrate and aluminum oxide barrier layer to obtain a bi-pass aluminum oxide film; then hydroxylation modification is carried out to obtain a hydroxylated alumina membrane, and finally interface wettability adjustment is carried out to prepare the heterogeneous wettability micro-nano composite bi-pass alumina membrane. The prepared micro-nano composite bi-pass aluminum oxide film has a self-assembled micron hole in one side, a three-dimensional interpenetrating nano hole in a bulk phase and a nano hole structure in the other side, and the intrinsic wettability of the micro-nano composite bi-pass aluminum oxide film is a super-amphiphilic interface. And finally, accurate wettability regulation and control and heterogeneous wettability construction are realized through chemical and physical wettability modification strategies, the super-amphiphilic through-hole aluminum oxide can be changed into a Janus aluminum oxide film, and the film has an asymmetric conical structure gradient.

In alternative embodiments, provided are combined magnetic tweezer-nanopore devices for combined magnetic tweezer-nanopore sequencing of polymers, and to prepare polymers for combined magnetic tweezer-nanopore sequencing. In alternative embodiments, provided are nanopore polymer sequencing systems comprising: a chip comprising a substrate, a layer disposed on the substrate, a sensor site disposed in the layer, an electrode disposed at the sensor site, an amplifier in connection with the electrode; a membrane disposed over the layer at the sensor site, and a nanopore disposed in the membrane, a magnet disposed in a cis position relative to the nanopore; and, a circuit comprising the electrode and a reference electrode, an amplifier in connection with the electrode and the reference electrode, a data acquisition (DAQ) system in connection with the amplifier, a bias module in connection with the amplifier, and a control module in connection with the bias module and the DAQ system.

The invention belongs to the technical field of 3D printing concrete materials, and particularly relates to 3D printing waste glass recycled lightweight aggregate concrete and a preparation method thereof. The concrete is prepared from the following raw materials: cement, silica fume, fine aggregate, waste glass recycled lightweight aggregate, a viscosity modifier, nano silicon dioxide, nano cellulose fibers, a water reducing agent, fly ash, a defoaming agent and water. The lightweight 3D printing concrete with different densities is prepared by replacing sand with the lightweight aggregate prepared by recycling the waste glass, the tackifier, the thixotropic agent, the nano-crystalline cellulose fiber, the water reducer and the fly ash are used for competitive synergistic effect to improve the water-retaining property and the rheological property, a nano-micron multi-scale synergistic system is constructed, multi-stage particle accumulation is effectively realized, and the 3D printing concrete with different densities is prepared. The problems that the constructability is difficult to improve while the density of conventional 3D printing lightweight aggregate concrete is reduced and the lightweight aggregate of low-density 3D printing concrete floats upwards are solved, the printable window time is prolonged, and the interface performance of an aggregate matrix is enhanced.

The application provides a kind of bicomponent super-hydrophilic fiber of skin-core structure and its preparation method, belongs to the field of composite fiber preparation, non-water-soluble PET is used as core layer material, nano SiO2 is uniformly mixed with water-soluble PET as skin layer material, and SiO2 / PET fiber of skin-core structure is prepared by melt spinning;Then, SiO2 / PET fiber is soaked in 80-95 DEG C hot water, is treated for 4-6 h by using three-stage gradient temperature control process, to dissolve water-soluble PET in skin layer, obtain bicomponent super-hydrophilic fiber.The bicomponent super-hydrophilic fiber provided in the application adopts skin-core structure, the skin layer is hydrophilic phase, the surface has a plurality of nanopores with pore size of 80-250 nm, bosses with height of 10-50 nm, pore depth is 1-3 um, and the overall open porosity is 30-65%, which ensures the exposure of hydrophilic nanoparticles (SiO2), the static water contact angle is ≤5° (completely wet within 2 s), has excellent super-hydrophilic and rapid moisture conducting performance, and maintains good mechanical strength and washing resistance.

Despite the existence and deployment of a range of antimicrobial / disinfectant / sterilization technologies and products, transmission of infectious diseases remains a significant problem worldwide, continuing to cause hundreds of millions of infections and millions of deaths every year of both human beings and animals. State-of-the-art technologies suffer from several disadvantages including being discrete in space and time, being overly dependent on human skill and discipline, and in some cases having harmful side-effects to human health. This invention proposes a series of industrial grade antimicrobial product designs, and materials and methods to make them highly effective products that offer continuous antimicrobial action, with minimum dependence on human discipline and skill once deployed, and with no harmful side-effects. Methods may include either or both first and second materials be formed by vapor or solution-based coating schemes and many may be antimicrobial in nature. Nanopores and / or nanotubes produce an ultra-high anti-microbially active surface area.

The present application relates to the field of molecular sieve preparation, and discloses a modification method of titanium silicalite molecular sieve, which comprises the following steps: 1) mixing titanium silicalite molecular sieve, a modifier and water to obtain a mixture; 2) performing hydrothermal modification treatment on the mixture to obtain a hydrothermal modification treatment product; 3) performing solid-liquid separation on the hydrothermal modification treatment product to obtain a solid phase and a liquid phase; 4) performing washing, drying and first calcination on the solid phase to obtain modified titanium silicalite molecular sieve; and 5) contacting the liquid phase and / or washing liquid obtained by washing with nanopore material, wherein the specific surface area and pore size of the nanopore material are larger than those of the modified titanium silicalite molecular sieve. The method provided by the present application can greatly reduce the COD value of waste liquid generated in the modification process of titanium silicalite molecular sieve, and the modified titanium silicalite molecular sieve obtained by the method has excellent catalytic performance.

The invention discloses a flexible silicon-modified zirconia fiber aerogel material for long-term efficient thermal protection and a preparation method thereof, and belongs to the technical field of structural ceramics and thermal insulation materials. The method comprises the following steps: synthesizing yttrium-stabilized zirconia precursor powder by taking zirconium chloride and yttrium chloride as raw materials and acetylacetone as a chelating agent; blending the powder with a silane coupling agent (the molar ratio of silicon to zirconium is (0.05-0.2): 1) and a spinning aid in a specific proportion to prepare a spinning solution; precursor fiber aerogel is obtained through electrostatic spinning, and a final product is obtained through segmented heat treatment. The prepared ceramic fiber has a unique core-shell structure, dispersed nanopores are uniformly distributed in the fiber core part, the outer layer is a compact shell layer, and the silicon element is mainly enriched in the grain boundary. According to the structure, the material has excellent flexibility (such as complete resilience under 98% compressive strain) and extremely low high-temperature thermal conductivity (about 0.083 W / m.K at the temperature of 1000 DEG C), and meanwhile, silicon doping effectively inhibits high-temperature grain growth. The material provided by the invention has wide application prospects in extreme environment fields such as high-temperature heat insulation, aerospace thermal protection and the like.

The invention relates to a wave absorbing-heat preventing and insulating composite material based on an impedance gradient structure and a preparation method and application of the wave absorbing-heat preventing and insulating composite material and relates to the technical field of electromagnetic wave absorbing materials.The composite material comprises a fiber reinforcement and a resin matrix, and the fiber reinforcement is sequentially provided with a heat insulating area and a wave absorbing area in the incident direction of electromagnetic waves; and the wave-absorbing area comprises a hybrid fiber layer formed by hybrid weaving of conductive fibers and wave-transparent fibers. By constructing an impedance gradient structure and preferably selecting the nanopore organic silicon resin as a matrix, the technical problems that an existing wave-absorbing material is narrow in absorption band, single in function and poor in high-temperature environment adaptability as well as complex in process, insufficient in long-acting stability and the like caused by dependence on an additional wave-absorbing agent are solved. The composite material realizes integration of multiple functions of wave absorption, heat prevention and heat insulation, has a broadband efficient wave absorption characteristic in a frequency band of 2-18GHz, can still keep excellent wave absorption performance after high-temperature ablation and thermo-oxidative aging, and is wide in application scene.

The present application relates to the technical field of high polymer compound composition, and discloses a kind of fluorine-containing rubber's rat bite prevention termite cable sheath material composition, comprising vinylidene fluoride base fluorine-containing rubber matrix and modified mesoporous calcium fluoride powder, by filling repellent component to mesoporous calcium fluoride carrier nanopore, and in orifice enrichment accelerator and on surface grafting functional group preparation, accelerator induces local crosslinking of matrix in carrier orifice when composition vulcanization, form dense crosslinking layer, the present application utilizes dense crosslinking layer to physically lock repellent component at room temperature, and with temperature increase adjustment network gap realizes controlled permeation, solve fluorine-containing rubber matrix small molecule additive blooming problem, maintain long-term biological repellent efficiency, and synergistically enhance the fatigue resistance of sheath material.

The invention relates to the technical field of automobile air conditioner filter elements, in particular to a production process of a multi-layer gradient composite automobile air conditioner filter element, a gradient structure of the multi-layer gradient composite automobile air conditioner filter element realizes active regulation and control on an airflow field and a pollutant capturing path: a loose outer surface serves as a pre-filtering layer to effectively intercept large particles and uniformize airflow; the fiber compactness and the nanopore / adsorption site density which are gradually enhanced inwards are sequentially responsible for fine filtration and efficient adsorption of VOC molecules, so that all functions of a traditional multi-layer structure are realized in a single material system.

The application discloses a kind of sodium ion battery biomass derived hard carbon negative electrode material and its preparation method and application based on crosslinking pore making, it is related to sodium ion battery technical field.Prepared by air oxidation and ammonium chloride catalytic dehydration crosslinking pore making process.The method is: first, air oxidation pretreatment is carried out to biomass, then mixed with ammonium chloride and dried, then low-temperature carbonization is carried out to make ammonium chloride decompose to form open nanopore, high-temperature carbonization is carried out to make open nanopore into closed pore structure, finally, after washing and drying, the final sodium ion battery biomass derived hard carbon negative electrode material is obtained.The method can improve the porosity of hard carbon material, optimize its pore structure, improve the efficiency of sodium ion transmission and storage, so that the material has the advantages of high specific capacity, high first coulomb efficiency, high rate performance and high energy density, and the process is simple, low in cost and environmentally friendly, solve the problems of low porosity of traditional hard carbon material in existing sodium ion battery negative electrode material, insufficient electrochemical performance and the like.

This invention discloses a preparation method and application of a composite adsorbent based on iron and steel smelting dust, belonging to the field of environmental functional materials and heavy metal wastewater treatment technology. This invention proposes a synergistic modification strategy of "hierarchical enrichment – ​​low-temperature plasma activation – iron-lanthanum gradient doping – lattice vacancy hierarchical regulation – molding and solidification": firstly, the active components in the dust are concentrated and enriched through sieving, gravity classification, and magnetic selection; then, nanopores are etched and functional groups are introduced through low-temperature plasma activation to provide iron-lanthanum ion loading sites; a Fe-La stepwise equal-volume impregnation process is used to construct Fe-La-Mn ternary active centers in combination with Mn in the iron and steel smelting dust, and calcination is performed to form a multi-element heterojunction, La... 3+ With Ca in dust 2+ Lattice coordination lowers the formation energy barrier of oxygen vacancies; gradient oxidation-reduction treatment generates shallow and deep oxygen vacancies in stages, driving in-situ oxidation of As(III) and electron replenishment, respectively; finally, molding and solidification yields spherical adsorbents with a mechanical strength ≥16 N / particle. This invention enables the high-value utilization of iron and steel smelting dust, and the adsorbent is easy to recover and produces no secondary pollution, making it suitable for the deep treatment of arsenic-containing heavy metal wastewater.

This invention discloses a high-strength passive daytime radiation cooling film and its preparation method, belonging to the field of functional polymer materials and thermal management technology. The film has a bilayer composite structure, including an upper reflective layer and a lower emitting layer. This invention employs an integrated process of melt blending-lamination-biaxial stretching-induced phase separation-extraction pore-fixing. Through a process design of stretching followed by extraction and a hierarchical biaxial stretching strategy, it achieves highly oriented molecular chains to enhance mechanical properties while precisely constructing a multi-level structure with both nanopores and micropores. The resulting film exhibits an average reflectivity >93% in the solar radiation band (0.25–2.5 μm), an average emissivity >95% in the atmospheric window (8–14 μm), a thermal conductivity <0.1 W / (m·K), and a tensile strength >30 MPa. This invention solves the technical bottleneck of achieving high reflectivity, high emissivity, low thermal conductivity, and high strength simultaneously in radiation cooling materials, and can be widely applied in building energy conservation, outdoor equipment thermal management, and electronic device heat dissipation.

The invention provides a bi-component super-hydrophilic fiber with a skin-core structure and a preparation method of the bi-component super-hydrophilic fiber, and belongs to the field of composite fiber preparation, water-insoluble PET serves as a core layer material, nano SiO2 and water-soluble PET are evenly mixed to serve as a skin layer material, and SiO2 / PET fiber with the skin-core structure is prepared through melt spinning; then, soaking the SiO2 / PET fiber in hot water of 80-95 DEG C, and treating for 4-6 hours by adopting a three-stage gradient temperature control process to dissolve water-soluble PET in a skin layer, so as to obtain the double-component super-hydrophilic fiber. The bi-component super-hydrophilic fiber provided by the invention adopts a skin-core structure, the skin layer is a hydrophilic phase, the surface is provided with a plurality of nano-pores with the pore diameter of 80-250 nm and bosses with the height of 10-50 nm, the depth of the pores is 1-3 microns, the overall open porosity is 30-65%, the exposure of hydrophilic nanoparticles (SiO2) is ensured, the static water contact angle is less than or equal to 5 degrees (complete wetting within 2 s), and the super-hydrophilic fiber has the advantages of high hydrophilicity, high water resistance, high water resistance and the like. The super-hydrophilic wet-permeable fabric has excellent super-hydrophilic and rapid wet-permeable performance, and keeps good mechanical strength and washing fastness.

This invention provides a high-wear-resistant and anti-reflective coating material for optical devices and its preparation method. The method involves preparing a cage-like polysilsesquioxane hybrid silica composite sol; mixing this sol with resin and other materials to obtain a coating; applying it as a single layer to a substrate; and then subjecting it to UV pre-curing and programmed temperature heat treatment. Utilizing the low surface energy of the cage-like polysilsesquioxane, it spontaneously migrates and accumulates on the coating surface, forming a dense, wear-resistant layer. Simultaneously, the migrating cage-like polysilsesquioxane leaves nanopores in the original silica region, forming a porous structure, thereby reducing the bulk refractive index of the coating and achieving anti-reflection. This invention, through a one-step coating and simple post-processing, simultaneously constructs an integrated gradient structure with a high-hardness, wear-resistant surface and efficient internal anti-reflection within a single coating, suitable for temperature- and process-sensitive optical devices such as resin lenses and displays.

The application provides a functionalized nanopore graphene membrane applied to mixed ion separation and a preparation method thereof, and belongs to the technical field of ion separation membranes; in the process of CVD growth of graphene, the preparation of functionalized nanopore graphene doped with heteroatoms is realized in one step; or graphene on a metal substrate is used as raw material and is transferred to a nonmetal substrate; vacancy defects are introduced into the graphene on the nonmetal substrate, the vacancy defects are selectively enlarged into nanopores of a specified size, and specific functional groups are non-covalently modified or covalently grafted onto the nanopores, so that the functionalized nanopores realize physical confinement and chemical restraint on specific ions. The application adopts a functionalization method, has high efficiency, controllable types of functional groups, wide reaction selection range, can avoid damage to the nanopore graphene by accurately controlling reaction conditions, realizes directional introduction of specific functional groups on the nanopore graphene, and the prepared nanopore graphene separation membrane has high separation efficiency on mixed ions.

The application discloses a method for improving the flux and hydrophobicity of a uniform pore membrane by selective fluorination, comprising the following steps: immersing a uniform pore membrane with a pore size of 5-100 nm and containing carboxyl functional groups into a reaction solution, wherein the reaction solution comprises a silver salt catalyst with a mass concentration in the range of 0.1-3.5 wt%, a fluorination reagent with a mass concentration in the range of 0.15-5.5 wt%, an oxidizing agent with a mass concentration in the range of 0.05-7.5 wt%, a co-catalyst with a mass concentration in the range of 0.15-5.5 wt%, water and an organic solvent with a mass concentration in the range of 5-65 wt%; reacting at 4-60 DEG C for 15 min-72 h, taking out the membrane, and then sequentially cleaning the membrane with ethanol and deionized water to obtain a uniform pore membrane with good membrane flux and hydrophobicity. The application improves the permeability and separation selectivity of the uniform pore membrane by selective fluorination, and the uniform pore membrane is not damaged, and the method has universality.

The application discloses a biomass-based hard carbon negative material and a preparation method and application thereof, and belongs to the technical field of carbon materials. The preparation method comprises the following steps: adding at least one first metal ion and at least one second metal ion into ammonia water, sufficiently dissolving to form a metal-ammonia complex solution; dissolving a biomass material in the metal-ammonia complex solution to obtain a uniform solution; washing and drying the uniform solution, and pyrolyzing and carbonizing to obtain a target material; the first metal ion is formed by an easily volatile metal with a boiling point not higher than temperature T, and the second metal ion is formed by a difficultly volatile sodium-philic metal with a boiling point higher than temperature T, and the temperature T is a pyrolysis carbonization temperature. The method dissolves cellulose by using a metal-ammonia complex solution, utilizes two types of metals with different boiling points, realizes sodium-philic metal single-atom uniform doping and nano-pore construction in cooperation in one step, and has the advantages of simple process, low cost, and excellent electrical performance of the obtained biomass-based hard carbon.

The invention belongs to the technical field of lithium ion battery material preparation, and particularly discloses a preparation method of a petroleum coke-resin-based hard carbon composite negative electrode material, a sodium ion battery and application of the sodium ion battery. The preparation method comprises the following steps: adding petroleum coke into a resin-based solution, carrying out pre-carbonization, mixing the obtained material with an organic sodium compound, a pore-forming agent, a cross-linking agent and an asphalt binder, carrying out curing, introducing a carbon source mixed gas through a vapor deposition method, coating the surface with amorphous carbon, and carrying out drying, so as to obtain the petroleum coke modified asphalt. The hard carbon composite material is obtained. The obtained material utilizes good anisotropy of the petroleum coke matrix to improve the electronic conductivity, the material obtained after carbonization of the resin has high specific capacity, the specific capacity and the dynamic performance of the material are improved by virtue of a nano-pore structure and a pore-forming structure formed by the cross-linking agent and the asphalt, and the synergistic effect of all the materials is exerted; the specific capacity and the rate capability of the hard carbon composite material are improved; the expansion is reduced; and the cycle performance is improved.

The application discloses a kind of hierarchical porous metal materials and preparation method, it belongs to 3D printing and orthopedic medical material field, the preparation method of hierarchical porous metal material includes steps: dispersing agent, binder, metal powder and organic solvent are ball milled, and organic metal ink is obtained;According to the structure of the sample to be printed and design model, the design model is converted into printing driver file and imported into 3D printing device;Organic metal ink is placed in 3D printing device, and printing is carried out based on printing driver file and layer by layer stacking, and organic metal green body is obtained;Organic metal green body is sealed and heat treated;Organic metal green body after heat treatment is treated to remove organic matter, and hierarchical porous metal green body is obtained;Hierarchical porous metal green body is defatted and sintered, and hierarchical porous metal material is obtained.The hierarchical porous metal material prepared by the application has macropores, micropores and nanopores, and is flexible and adjustable, and can be used for the treatment of bone defects.