230 results about "Composite nanofibers" patented technology

The invention discloses a preparation method of a cellulose acetate / thermoplastic polyurethane / polypyrrole composite conductive nanofiber aerogel composite pressure sensing material. The preparation method comprises the following steps: (1) preparing a cellulose acetate and thermoplastic polyurethane spinning solution; (2) preparing a cellulose acetate / thermoplastic polyurethane composite nanofiber membrane; (3) preparing cellulose acetate / thermoplastic polyurethane short nano dispersion liquid; (4) preparing a cellulose acetate / thermoplastic polyurethane / polypyrrole polymerization solution; and (5) preparing the cellulose acetate / thermoplastic polyurethane / polypyrrole composite conductive nanofiber aerogel. According to the preparation method, a high-temperature thermal annealing process is not needed, and the prepared nanofiber composite aerogel has high conductivity, ultralow volume density, high compression deformation performance and high pressure resistance sensing sensitivity.

The invention discloses a preparation method and application of a composite PVDF-HFP and polylysine nanofiber diaphragm, and belongs to the technical field of lithium batteries. The composite material is prepared by blending polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) and polylysine and then carrying out an electrostatic spinning process. The PVDF-HFP is utilized to provide excellent mechanical strength and chemical stability, rich polar amino functional groups in a polylysine molecular chain are utilized to improve the lyophilic property of the membrane, and anions in an electrolyte are fixed through an intermolecular acting force, so that the transference number of lithium ions is increased, and the lithium ions are induced to be uniformly deposited. The nanofiber membrane combines the characteristics of PVDF-HFP and polylysine, has high porosity, good thermal stability and excellent interface compatibility, can effectively inhibit the growth of lithium dendrites and prevent the diaphragm from being punctured, and can significantly prolong the cycle life and improve the safety performance of the lithium metal battery when being applied to the lithium metal battery.

The application discloses a preparation method of a sandwich structure bio-based composite nanofiber aerogel material, and comprises the following steps: step 1), heating and stirring to dissolve low acyl gum; step 2), mixing the product obtained in step 1) with a hot aqueous solution of MXene; step 3), freeze-drying treatment of the aqueous solution of MXene to obtain a compressed layer of MXene; step 4), pasting and covering the product obtained in step 3) on an outer layer obtained in step 2), pouring the gum solution obtained in step 1) into the outer layer to obtain a sandwich structure composite hydrogel; step 5), soaking the product obtained in step 4) in a metal salt solution to harden; step 6), soaking the product obtained in step 5) in an organic solvent solution; and step 7), drying the product obtained in step 6) by using a supercritical liquid carbon dioxide drying method to obtain the sandwich structure bio-based composite nanofiber aerogel. The material has low thermal conductivity.

The invention relates to the technical field of catalyst preparation, and discloses a preparation method and application of a ruthenium / cerium oxide composite nanofiber catalyst, and the preparation method comprises the following steps: (1) adding cerium salt and P123 into a mixed solution of DMF (Dimethyl Formamide) and an alcohol solvent according to a molar ratio of 1: (0.1-0.4), stirring and mixing, and carrying out hydrothermal reaction at 160-180 DEG C for 4-12 hours to obtain a spinning solution; (2) performing electrostatic spinning on the spinning solution to obtain a cerium fiber precursor; (3) pre-oxidizing the cerium fiber precursor, and then carrying out aerobic roasting to obtain a cerium oxide nanofiber carrier; and (4) dipping the cerium oxide nanofiber carrier in a ruthenium salt solution, drying, and performing hydrogen reduction to obtain the catalyst. According to the invention, the ruthenium / cerium oxide composite nanofiber catalyst with a unique cavity-containing nanofiber form is prepared by adopting an electrostatic spinning technology, and the ruthenium / cerium oxide composite nanofiber catalyst has good catalytic selectivity and stability in an ammonia decomposition reaction.

The present invention belongs to the technical field of microwave-absorbing materials, and specifically relates to a method for preparing a cobalt / attapulgite / carbon nanocomposite fiber with microwave-absorbing properties. The preparation method comprises the following steps: mixing a magnetic metal salt, a polymer, a solvent, and nano-attapulgite in a specific proportion, reacting under heating conditions and at room temperature to obtain a mixed spinning solution; electrospinning the mixed spinning solution to obtain composite nanofibers; and carbonizing the obtained composite nanofibers to obtain a cobalt / attapulgite / carbon nanocomposite fiber with microwave-absorbing properties. The present invention has the beneficial effect that, due to the adoption of the above-mentioned technical solution, the carbon nanocomposite fiber of the present invention combines excellent properties such as light weight, strong absorption, a wide effective absorption bandwidth, and a low filling ratio. The carbon nanofibers have excellent dielectric properties, electrical conductivity, thermal stability, and low density. Carbon nanofibers are expected to be used to produce ideal microwave-absorbing materials.

The invention discloses a gradient thermal response composite nanofiber diaphragm and a preparation method thereof. The composite nanofiber diaphragm is composed of three functional layers: a) a surface layer: a low-density polyimide nanofiber layer (porosity is 60%-80%), and doped nano zirconium dioxide (5-10 wt%) improves the wettability of an electrolyte; b) a middle layer: polyimide / boron nitride nanosheet composite fibers (the content of boron nitride is 15-20wt%) form a three-dimensional heat conduction network; c) a bottom layer: a thermally induced phase change layer (polyimide and phase change microcapsule co-spinning) which triggers a hole closing effect at 160 DEG C; an in-situ electrostatic spinning composite process: adopting a coaxial nozzle for synchronous spinning; injecting a polyimide spinning solution containing boron nitride into an inner layer, and injecting a phase change microcapsule suspension into an outer layer; and an electric field gradient control technology (the voltage is gradually reduced from 25kV to 18kV) is introduced, so that the gradient distribution of the fiber diameter from 80nm to 200nm is realized. Through the innovative structural design and the advanced preparation process, the safety, the performance and the reliability of the lithium ion battery under the high-temperature working condition are remarkably improved, and important technical support is provided for the development of the high-performance lithium ion battery. The 180 DEG C thermal shrinkage rate of the product is less than 2% (reduced by more than 40% compared with the prior art); and the bottom layer closed hole response time during thermal runaway is less than 8 seconds (the traditional diaphragm is more than 15 seconds).

The invention discloses a flexible full-biodegradable Janus nanofiber membrane for oil-water separation, which is characterized in that two degradable polymer spinning solutions are spun into a composite nanofiber membrane with a Janus structure through a side-by-side electrostatic spinning method, and then hydrophilic modification is performed to obtain a hydrophilic nanofiber membrane used as an oil-water separation membrane. The product is the flexible full-biodegradable Janus nanofiber membrane for oil-water separation. The obtained hydrophilic nanofiber membrane has good mechanical flexibility, full biodegradability and excellent oil-water selective permeability, the oil-water separation effect and application stability are remarkably improved, the service life is remarkably prolonged, and the hydrophilic nanofiber membrane will become an oil-water separation membrane material with practical value.

The invention relates to the technical field of lithium-ion solid-state batteries, in particular to a three-dimensional polymer modified intermediate layer for a lithium-ion solid-state battery and a preparation method of the three-dimensional polymer modified intermediate layer, and the preparation method comprises the following steps: adding polyacrylonitrile into N, N-dimethylformamide, and stirring until the polyacrylonitrile is completely dissolved; and then adding the modified polyamide acid-phosphonate copolymer, continuously stirring to obtain an electrostatic spinning precursor solution, and carrying out electrostatic spinning on the electrostatic spinning precursor solution to obtain the composite nanofiber membrane. According to the invention, the indium-containing heterocyclic modified diamine is used as a core monomer of the polyamide acid-phosphonate copolymer, the lithium deposition nucleation overpotential can be reduced by the excellent lithium-loving activity of the indium-containing heterocyclic modified diamine, the lithium is enabled to be compact and free of dendritic crystal deposition, and the indium-containing heterocyclic group is uniformly dispersed in a three-dimensional framework through a cross-linked network of the modified polyamide acid-phosphonate copolymer, so that the performance of the polymer is improved. The contact interface of the intermediate layer and the lithium metal forms a global uniform lithium-loving site, and concentrated deposition of lithium atoms caused by local lithium-loving activity difference is avoided.

The invention provides a platinum-based catalyst and a preparation method and application thereof, and belongs to the technical field of fuel cells. The preparation method comprises the following steps: mixing a polymer solution, a conductive agent and a zeolite imidazate framework material to obtain an electrostatic spinning solution; carrying out electrostatic spinning on the electrostatic spinning solution, and then carrying out heat treatment to obtain composite nanofibers containing metal nanoparticles or metal oxide nanoparticles; and mixing the composite nanofiber, a platinum source and an organic solvent, and carrying out a reduction reaction to obtain the platinum-based catalyst. According to the preparation method, the polymer solution, the conductive agent and the zeolite imidazate framework material are mixed, and uniform distribution of all the components on the nanoscale can be ensured by virtue of an electrostatic spinning technology, so that a stable and efficient three-phase interface can be formed; the metal nanoparticles or metal oxide nanoparticles obtained by conversion are compounded with platinum particles, so that the catalyst exposes more active sites, and the efficient proceeding of the catalytic reaction is facilitated.

The application belongs to the field of medical biological materials, and relates to a preparation method of a hierarchical nanofiber composite film for nerve repair and application thereof. The method comprises the following steps: preparing multilayer nanofibers with different internal stresses through continuous multiple electrostatic spinning units, stacking the multilayer nanofibers with different internal stresses to form a composite nanofiber film with an internal stress gradient; chemically crosslinking the composite nanofiber film; performing adhesion molecule adhesion treatment on the upper surface of the composite nanofiber film; and preparing the hierarchical nanofiber composite film with an internal stress gradient and capable of self-deforming under the action of liquid to wrap nerves. The film provided by the application has excellent flexibility, biocompatibility and degradation performance, can efficiently and quickly adhere to the surface of damaged nerves, provides a good support microenvironment for nerve cell growth, promotes nerve regeneration and repair, and has a wide application prospect in the field of peripheral nerve injury repair.

The invention relates to the technical field of nano composite materials, in particular to a composite aerogel material as well as a preparation method and application thereof. The preparation method comprises the following steps: providing an MXene solution and a polypropylene nanofiber colloidal solution; mixing the MXene solution and the polypropylene nanofiber colloidal solution to obtain a first mixed solution; performing freeze thawing treatment on the first mixed solution for multiple times to obtain composite nanofiber colloid hydrogel; the composite nanofiber colloid hydrogel is subjected to freeze drying, and composite nanofiber colloid aerogel is obtained; and immersing the composite nanofiber colloid aerogel into a solution containing polysiloxane, and then sequentially carrying out curing and ceramic treatment to obtain the composite aerogel material. The prepared composite aerogel material has heat insulation and compressibility, and is expected to be applied to the fields of flexible wearable electronics, energy and environment.

The present application relates to a kind of Nb2O5 / W 18 O 49 Heterojunction nanofiber photocatalyst and its preparation method and application belong to photocatalytic material technical field. Its preparation method is first prepared Nb2O5 electrostatic spinning precursor solution, and Nb2O5 precursor web felt is obtained by electrostatic spinning technology;Then high-temperature calcination is obtained in air Nb2O5 nanofiber photocatalyst. Again, W 18 O 49 Precursor solution is prepared by hot solvent method, and W 18 O 49 It is successfully prepared Nb2O5 / W 18 O 49 Heterojunction nanofiber photocatalyst. The catalyst shows enhanced CO2 reduction activity and CO selectivity under the irradiation of ultraviolet visible light. The composite nanofiber photocatalyst provided by the application is simple, green and environmentally friendly, has high photocatalytic activity, good stability and repeatability, and has wide application market prospect.

The invention discloses multicolor optical anti-counterfeiting alumite and a production process thereof. The alumite sequentially comprises a magnetic-sensitive enhanced substrate layer, a dynamic separation layer, a temperature-magnetic composite nanofiber multicolor layer, a polyelectrolyte alternate deposition barrier layer and a gradient magnetic-sensitive aluminized layer from bottom to top, wherein the magnetic-sensitive enhanced substrate layer, the dynamic separation layer, the temperature-magnetic composite nanofiber multicolor layer, the polyelectrolyte alternate deposition barrier layer and the gradient magnetic-sensitive aluminized layer are arranged on the alumite; wherein the magnetic-sensitive enhanced substrate layer comprises a graphene modified PET supporting layer and a three-dimensional net-shaped micro-channel embedded with Fe3O4 particles, the dynamic separation layer is temperature-sensitive phase change fluororesin, the temperature-magnetic composite nanofiber colorful layer is electrostatic spinning nanofibers of a core-sheath structure, and the blocking layer is of a polyelectrolyte alternate deposition structure and is embedded with infrared invisible identification particles. According to the invention, four anti-counterfeiting functions of multicolor optical response, magnetic response activation and infrared invisible two-dimensional codes are integrated, the advantages of high multicolor optical contrast, fast response, multiple reuse times, excellent barrier performance, stable transfer printing and the like are achieved, the method is suitable for scenes of high-end tobacco and wine, luxury packaging, high-added-value labels and the like, and the anti-counterfeiting grade and the practicability are obviously improved.

The invention provides a preparation method of a keratin-based temperature-sensitive composite nanofiber membrane. The preparation method comprises the following steps: polymerizing keratin and an N-isopropylacrylamide monomer (NIPAm) to obtain temperature-sensitive keratin; keratin, temperature-sensitive keratin and PEO are blended in proportion to obtain a keratin-based temperature-sensitive spinning solution, then a keratin-based temperature-sensitive composite nanofiber membrane is prepared through an electrostatic spinning technology, finally, the nanofiber membrane is soaked in an EDC-NHS solution for crosslinking, and the water-insoluble composite nanofiber membrane is obtained. The keratin-based temperature-sensitive composite nanofiber membrane not only has good biocompatibility and biological activity, but also has a temperature response function, and shows a wide application prospect in the fields of biomedicine and environment.

The invention relates to the technical field of composite fibers, in particular to a composite nanofiber with a skin-core structure and a preparation method and application of the composite nanofiber. In the composite nanofiber structure of the skin-core structure, a skin layer comprises modified boron nitride and a high-molecular polymer, and the modified boron nitride is modified boron nitride of which the surface is modified with polydopamine; and the core layer is a pyrazine compound solution. The nanofiber material prepared by the method disclosed by the invention shows excellent and stable heat conduction performance and hydrophobic performance. The material has a remarkable industrial application prospect in the fields of controlled release of tobacco essence, moisture-proof packaging and the like.

The invention discloses a preparation method of porous carbon nanofibers for carbon dioxide capture performance research. The preparation method comprises the following steps: step 1, taking polyacrylonitrile as a base material and polyvinylpyrrolidone as a pore-forming agent, and carrying out electrostatic spinning to obtain composite nanofibers; step 2, soaking the composite nanofibers prepared in the step 1 in sodium hypochlorite to obtain porous nanofibers; 3, performing high-temperature carbonization treatment on the porous nanofibers prepared in the step 2 to prepare porous carbon nanofibers; and step 4, carrying out drying treatment on the porous carbon nanofiber prepared in the step 3. The problems of high technical energy consumption and high cost in the prior art are solved.

A composite nanofiber aerogel (CNA) is formed from aramid nanofibers (ANFs) combined with polyvinyl alcohol (PVA). These nanoscale constituents of the aerogel form 3D networks with high nodal connectivity and strongly welded connectivity joints between fibrils so that the structure has high stiffness and strength compared to other polymeric aerogels and successive breakage of crosslinks at the connectivity nodes affords energy dissipation while maintaining the overall structural integrity. A specific class of CNA with a specific solid content may be used to form a thin firm with a composite nanofiber framework (CNFF) that is useful in the manufacture of kirigami wearable electronics.

The application provides a device for preparing a composite nanofiber porous membrane, and relates to the technical field of nanofiber membranes. The device for preparing a composite nanofiber porous membrane comprises a stirring mechanism, a membrane preparation mechanism, a filtering mechanism and a plurality of quantitative mechanisms, and each mechanism cooperates to complete an integrated operation of material conveying, mixing, membrane preparation and waste gas treatment. The stirring mechanism is a sealed cavity structure, an internal stirring module for stirring and mixing materials is arranged in the stirring mechanism, one side of the stirring mechanism is fixedly connected with the membrane preparation mechanism through a conveying pipeline, the uniformly stirred materials can be stably pumped into the membrane preparation mechanism, and a waste gas pipe is communicated with the stirring mechanism through an air pump close to the upper end position in the stirring mechanism. The device has the advantages of precise quantitative conveying of raw materials, efficient mixing of materials, recycling of waste gas after purification, high automation degree of membrane preparation and discharging, integrated and cooperative operation of each module, and improved production efficiency and product qualification rate.

This invention belongs to the field of nanoenergy technology, and particularly relates to a method for preparing a multifunctional composite nanofiber membrane, a single-electrode triboelectric sensor, and its applications. The method includes the following steps: combining degummed and impurity-removed silk fibroin with a mixed solvent composed of anhydrous calcium chloride and formic acid, and stirring at room temperature to form a silk fibroin solution; adding TiO2 to the silk fibroin solution, and then adding phase change materials (PCMs) after stirring, followed by stirring and ultrasonic treatment to prepare a PCMs / TiO2 / silk fibroin spinning solution; and using solution jet spinning technology to convert the spinning solution into a silk fibroin-based composite nanofiber membrane. This composite nanofiber membrane has an adaptive temperature regulation function of daytime cooling and nighttime heat preservation, especially when applied to model cars, achieving daytime cooling up to 22°C. Simultaneously, the composite membrane also possesses excellent triboelectric properties and can be used to prepare a single-electrode triboelectric sensor with a maximum output power of approximately 272 μW / m. 2 It can realize sensing and monitoring functions in outdoor applications.

The application relates to a composite nanofiber membrane and a preparation method and application thereof, and belongs to the technical field of wearable electromagnetic shielding materials. The preparation method comprises the following steps: dissolving polyacrylonitrile in a solvent, spinning, and obtaining a polyacrylonitrile nanofiber membrane; then immersing the polyacrylonitrile nanofiber membrane in a tris-hydroxymethyl aminomethane hydrochloride solution containing dopamine; then immersing the dopamine-coated fiber membrane in a mixed solution containing a copper salt or a silver salt, and then immersing the dopamine-coated fiber membrane in a reaction solution, so as to obtain a modified nanofiber membrane; then spraying a dispersion liquid containing a conductive filler on the modified nanofiber membrane, so as to obtain a conductive filler modified nanofiber membrane; and finally dissolving polyurethane in a solvent, spinning the conductive filler modified nanofiber membrane as a receiver, and obtaining a composite nanofiber membrane. The composite nanofiber membrane has excellent electromagnetic shielding performance, directional sweat-removal capability, air permeability, light-heat conversion capability, antibacterial property, mechanical strength and flexibility.

This invention relates to the field of gas sensor technology, specifically to a flexible room-temperature ammonia sensor and its fabrication method. It solves the problems of ammonia sensors struggling to balance room-temperature operation with good flexibility, polymer-based sensors having limited sensitivity and poor electron transport, and complex fabrication processes. The sensor comprises a flexible, self-supporting composite nanofiber membrane and interdigitated metal electrodes situated thereon. This invention utilizes organic disulfonic acid as a dopant to introduce sulfonate groups in situ in a one-step process, resulting in sulfonate (-SO3) groups on the surface of the SPANI sensor. ‑ The Zr-TiO2 nanofiber network can interact strongly with ammonia molecules, significantly enhancing its sensitivity to ammonia at room temperature. Meanwhile, the Zr-TiO2 nanofiber network, as a flexible framework and electron transport channel, forms a heterojunction with SPANI, effectively improving the poor electron transport capability of pure polymer materials. The sensor prepared by this invention has the advantages of high sensitivity and good flexibility to ammonia at room temperature.

The invention discloses a preparation method of a Cu-doped SiO2 / C hollow composite nanofiber lithium ion battery negative electrode material. The material is SiO2 / C coated Cu nanofiber. The Cu-doped SiO2 / C composite nanofiber is prepared by utilizing an electrostatic spinning technology and a high-temperature calcination process. The Cu element is doped into SiO2 / C in the form of Cu elementary substance particles, so that the electronic conductivity and the electrode electrochemical performance of the SiO2-based material are successfully improved. Under the current density of 100mA g <-1 >, the residual specific capacity after 100 cycles can reach 515.4 mAh g <-1 >.

The present application relates to a kind of high uniformity transformer insulating paperboard dynamic forming process and integrated preparation system, belong to transformer insulating material processing technical field, the system includes multiple-source modification module, ultrasonic fluidization module, dynamic reconfiguration module and gradient compaction module.Processing steps cover: slurry is carried out electromagnetic polarization and is compounded nanofiber to break flocculation;In the sizing stage, microflow beam treatment is carried out by applying ultrasonic field;In the forming net part, Z-axis interpenetration interweaving is generated by pulse vacuum induction fiber;Finally, temperature gradient formed by multistage temperature control press roller guides moisture migration and completes compaction.The present application introduces electric physical intervention and fluctuation pressure field, realizes the accurate control of fiber from micro-dispersion to three-dimensional reconstruction, effectively solves the problem of insufficient interlaminar bonding force and tightness of insulating paperboard, improves the electrical strength and mechanical robustness of transformer insulating component.

This invention provides a method for preparing a composite nanofiber electron transport layer and a perovskite solar cell, belonging to the field of perovskite solar cell technology. It solves the problem of numerous defects existing on the surface and inside the electron transport layer of current perovskite solar cells. The method includes the following steps: dissolving PAN and SnCl2 2H2O in DMF to obtain a mixture, stirring the mixture in air for a period of time to form a precursor solution; placing the precursor solution into the syringe of an electrospinning apparatus, resulting in hemispherical droplets appearing at the tip of the syringe; using an electrospinning apparatus to obtain a SnCl2 2H2O:PAN composite fiber film with a diameter of nanometers on a prepared conductive substrate; calcining the prepared SnCl2 2H2O:PAN composite fiber film in air at 200°C to obtain pure SnO2:PAN composite nanofibers; and spin-coating a layer of SnO2 thin film onto both the upper and lower interfaces of the prepared SnO2:PAN composite nanofibers. This invention is applicable to perovskite solar cells.

The application relates to the technical field of nanomaterials, and particularly relates to aramid-boehmite composite nanofibers, a synthesis method and application thereof, which comprise the following steps: step one, preparing an Al(OH)3 dispersion solution; step two, preparing an Al(OH)3 precursor; step three, performing solvent exchange; step four, transferring aramid nanofiber gel subjected to solvent exchange into a Teflon container, heating in a closed environment, and obtaining a crude product; and step five, washing the crude product with deionized water and sufficiently drying to obtain aramid-boehmite composite nanofibers. The aramid-boehmite composite nanofibers with aramid nanofibers as cores and boehmite as sheath layers are synthesized by using a hydrothermal method, the aramid-boehmite composite nanofibers are used for coating modification of lithium ion battery separators, the heat resistance and porosity of the lithium ion battery separators are improved, and the Gurley number of the separators is reduced.

The invention discloses a ZrO2 / Ti4O7-Al2O3 / C composite nanofiber material and a preparation method and application thereof. The preparation method comprises the following steps: preparing alumina nanorods and modifying them with sodium hydroxide; introducing lithiophilic Ti and Zr elements onto the surfaces of the surface-modified alumina nanorods by electrospinning to form a stable ZrO2 / Ti4O7-Al2O3 composite nanofiber fabric; covering the fabric with graphite foil and subjecting the fabric to high-temperature carbonization to obtain the ZrO2 / Ti4O7-Al2O3 / C composite nanofiber material, which is used as a negative electrode material for a lithium metal battery, effectively inhibits dendrite growth and volume expansion of the lithium metal negative electrode, and improves the cycle life and rate performance of the battery; and assembling a half-cell using the ZrO2 / Ti4O7-Al2O3 / C composite nanofiber negative electrode of the invention, effectively inhibiting dendrite growth of the lithium metal negative electrode, and improving the cycle life and rate performance of the battery.

This invention discloses a composite nanofiber membrane for immobilizing microorganisms to remediate diesel-contaminated water and its preparation method. Specifically, the composite nanofiber membrane is a thermoplastic polyurethane / nanohydroxyapatite composite nanofiber membrane, which not only possesses excellent biocompatibility and mechanical strength but is also non-toxic and harmless, offering considerable cost-effectiveness. Upon introduction into diesel-contaminated water, the composite nanofiber membrane first rapidly adsorbs diesel at the water / oil interface, preventing further diffusion and toxic effects on the aquatic environment. Subsequently, due to the additional adsorption sites provided by the nanoparticles on the membrane, a large number of free bacteria are adsorbed onto the membrane, enhancing the metabolic activity of bacterial cells and their resistance to the toxicity of stubborn compounds, while also strengthening the affinity between hydrophobic compounds and cells, thereby increasing the degradation rate of diesel hydrocarbons by microbial cells. This invention improves the remediation effect of diesel wastewater while expanding the application of composite nanofiber membranes in the field of water pollution treatment.

The invention relates to the technical field of nanofiber filter material preparation, and particularly discloses a composite nanofiber filter material preparation device which comprises a tank body, the tank body is internally provided with a mixing cavity, the top of the tank body is provided with a feeding port communicated with the mixing cavity, and the bottom of the tank body is provided with a discharging port; the rotating shaft extends into the mixing cavity from the top of the tank body and is rotationally connected with the tank body; the stirring mechanism comprises a stirring rod driven by the rotating shaft and a main stirring head located at the lower end of the stirring rod, the stirring rod is obliquely arranged, and the main stirring head extends into the bottom of the tank body. The production efficiency of the composite nanofiber filter material can be efficiently improved, and the device is simple in structure and suitable for popularization.

The invention discloses a composite nanofiber diaphragm and a preparation method thereof, and relates to the technical field of lithium ion battery materials. Functional groups are introduced into the polyamide acid nanofiber membrane firstly, then silver ions are loaded on the nanofiber membrane, the composite nanofiber membrane is obtained through reduction and thermal imidization, and the prepared composite nanofiber membrane has excellent dendritic crystal inhibition performance and can keep high porosity and excellent ionic conductivity; and the thermal safety is good, so that the battery has excellent electrochemical performance and safety.

The application discloses a kind of β-CD / waste polyester electrostatic spinning composite nanofiber membrane and its preparation method and application, CWP spinning solution and β-CD solution are respectively placed in electrostatic spinning machine receiving drum two ends and are prepared with the " honeycomb structure " β-CD / CWP nanofiber composite membrane, its porosity is high, and β-CD is " bowl shape " structure, these special structures are conducive to reduce filtration resistance, improve the removal of particulate matter PM in oil smoke and volatile organic gas COFs, so as to obtain excellent comprehensive filtration performance.Oil smoke detection system is used to test the real oil smoke purification performance of composite membrane (>90%), which is much higher than that of commercially available oil smoke purification materials;After 120 min cycle purification, the purification efficiency is flat with the initial efficiency (>90%), and can be widely used in high-end air filtration, oil-gas separation and other fields.