361 results about "Composite nanofibers" patented technology

The invention provides a composite nanofiber membrane applied to detection of a C4F7N gas decomposition component C3F6, a preparation method of the composite nanofiber membrane and a sensing device. The composite nanofiber membrane comprises a polymer nanofiber substrate and a metal organic framework dispersed in the polymer nanofiber substrate, the metal organic framework is MIL-101 (M), and M represents a metal element and comprises at least one of Cr, Cu and lanthanide series metal elements; the surface of the interdigital electrode is coated with the composite nanofiber membrane, and the composite nanofiber membrane serves as a sensing device and is used for detecting C3F6 gas. The sensor disclosed by the embodiment of the invention can generate response within 25s, still has certain sensitivity (which is 3% or above) to 10ppm of C3F6 gas, and meets the requirements on high sensitivity and quick response in detection of a C4F7N gas decomposition product C3F6.

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 belongs to the technical field of fuel cell non-noble metal catalyst material preparation, and particularly relates to a composite carbon nanofiber catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, combining metal ions with an organic ligand in an organic solvent at room temperature to successfully prepare a zeolite imidazate framework material (ZIFs); the preparation method comprises the following steps: carrying out primary carbonization on a prepared ZIFs material in an inert atmosphere high-temperature furnace to obtain a metal nitrogen carbon material, then uniformly mixing the metal nitrogen carbon material with a spinning solution, carrying out electrostatic spinning to obtain composite nanofibers, and then carrying out secondary carbonization in an inert atmosphere to finally successfully prepare the composite carbon nanofiber catalyst (MN-CNF). The catalyst has excellent electrocatalytic activity, can effectively improve the efficiency of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), and also has excellent catalytic stability.

The invention discloses an electrostatic spinning preparation method of a multifunctional composite nanofiber membrane, which comprises the following steps: step 1, sequentially adding PVDF (Polyvinylidene Fluoride) and PLA (Polylactic Acid) into a first mixed solvent, and adding TiO2 while stirring to obtain a shell solution; melting n-octadecane to obtain a core layer solution; step 2, adding PVDF into a second mixed solvent to obtain a PVDF electrospinning solution; 3, the shell layer solution and the core layer solution are subjected to coaxial electrostatic spinning to form core-shell fibers, the PVDF electrospinning solution is subjected to single-shaft electrostatic spinning to form PVDF beads, high voltage is provided, and PVDFamp formed by compounding the core-shell fibers and the PVDF beads is formed on the aluminum foil; the invention relates to a PVDF / PLA / TiO2 (at) Oct composite nanofiber membrane. The material has good anti-ultraviolet, waterproof, breathable, self-cleaning and thermal regulation functions, and has excellent mechanical properties and degradability.

The invention discloses a preparation method and application of a dry self-adhesion flexible capacitive pressure sensor, and the method comprises the steps: dissolving a polymer through an organic solvent, and obtaining an electrostatic spinning precursor solution; performing same-pressure conjugate electrostatic spinning through the electrostatic spinning precursor solution to obtain a self-adhesion composite nanofiber membrane; a nanofiber membrane is obtained through electrostatic spinning; the obtained self-adhesion composite nanofiber membrane is used as a packaging layer, and the nanofiber membrane is used for preparing a flexible electrode in a mode of vacuum filtration of a carbon nanotube; and assembling the obtained packaging layer and the flexible electrode according to a capacitive structure, leading out a wire, positioning the assembled structure by using a hollow mask plate, and completing packaging through a hollow hot pressing technology. Through specific polymer selection and an electrostatic spinning technology, the prepared self-adhesion composite nanofiber membrane can be directly adhered to the skin or other complex surfaces, an additional adhesive is not needed, and the comfort level and the use convenience of a user are improved.

The invention provides a method for increasing the content and distribution uniformity of filler in paper sheets and increasing the strength of the paper sheets, and belongs to the technical field of papermaking. The method for improving the content and distribution uniformity of the filler in the paper sheet and increasing the strength of the paper sheet comprises the following steps: preparing a modified composite nanofiber dispersion liquid, preparing a positive electric buffer solution, preparing a positive electric composite slow release solution, preparing a filler particle suspension liquid, and mixing and manufacturing paper with pulp. According to the method for improving the content and the distribution uniformity of the filler in the paper sheet and improving the strength of the paper sheet, the flocculation speed of the filler can be mildly and effectively controlled, the size of floccules can be controllably adjusted, the distribution uniformity of the filler in the paper sheet can be improved while the content of the filler in the paper sheet is improved, and the paper sheet strength is improved. The adverse effect on the mechanical property of the paper sheet caused by filler dosage increase is effectively avoided, and the paper sheet strength is further improved.

The invention discloses a body surface sweat in-situ detection sensor based on composite nanofibers and a preparation method, and relates to the technical field of flexible sensing, the body surface sweat in-situ detection sensor comprises a flexible substrate and a detection electrode; the flexible substrate includes: a hydrophobic layer; the liquid guide layer is arranged on the hydrophobic layer and is provided with a sweat non-wetting area and a first sweat wetting area, and the contact angle of the first sweat wetting area is gradually reduced and is smaller than that of the hydrophobic layer; the liquid collection layer is arranged on the liquid guide layer and is provided with a sweat non-wetting area and a second sweat wetting area, and the contact angle of the second sweat wetting area is smaller than that of the first sweat wetting area; the volatilization layer is arranged on the liquid collection layer and provided with a third sweat wetting area, and the contact angle of the third sweat wetting area is larger than that of the second sweat wetting area and smaller than that of the first sweat wetting area; the detection electrode is arranged in the liquid collection layer and is in contact with the second sweat wetting area. The method has the advantages that the multi-scale structure of the electrospun nanofiber is fully utilized, one-way self-permeation of sweat is achieved, cross contamination of new sweat and old sweat is prevented, and sweat detection accuracy is improved.

The invention relates to a slow-release composite nanofiber mask with one-way moisturizing and oxidation resistance and a preparation method thereof.The one-way moisturizing nanofiber mask base cloth with asymmetric wettability is obtained through the preparation method, a hydrophilic layer adsorbs a nutrient solution and is dissolved when meeting water, a hydrophobic layer is kept dry, and the effect of delaying liquid volatilization is achieved; the effective time of the mask is prolonged. In addition, the nanofiber mask base cloth obtained through electrostatic spinning has good air permeability.

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 invention provides an optical transparency-optical confinement composite nanofiber membrane as well as a preparation method and application thereof. The optical transparency-optical confinement composite nanofiber membrane comprises a PDMS (Polydimethylsiloxane) / PS (Polystyrene) / TPU (Thermoplastic Polyurethane) nanofiber membrane and a photothermal conversion material layer loaded on the PDMS / PS / TPU nanofiber membrane, the PDMS / PS / TPU nanofiber membrane is prepared by taking PDMS, PS and TPU as raw materials and adopting an electrostatic spinning technology; the photothermal conversion material layer comprises honeycomb porous carbon nanofibers and PDA (Personal Digital Assistant). The optical transparency-optical confinement composite nanofiber membrane and the PDMS / PS / TPU nanofiber membrane have excellent light transmittance and hydrophobicity, the photo-thermal conversion material layer has excellent light absorptivity and high photo-thermal conversion capacity, and the optical transparency-optical confinement composite nanofiber membrane has high membrane flux when being used for photo-thermal membrane distillation desalination. And the photo-thermal film is excellent in distillation performance stability.

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 lithium batteries, in particular to a lithium-loving PCOF-PMIA composite nanofiber membrane and a preparation method and application thereof.According to the preparation method, the lithium-loving PCOF-PMIA composite nanofiber membrane is obtained by means of an electrostatic spinning technology and a room-temperature in-situ growth technology, and the mechanical strength of the fiber membrane is greatly improved; the COF nanoparticles are prepared by a room-temperature stirring synthesis process, and the method has the advantages of mild reaction conditions, simplicity in operation, short time consumption and the like; the lithium-loving PCOF-PMIA composite nanofiber membrane has a uniform net-shaped nanofiber structure, and COF particles on the surface and in the fiber can be effectively connected at the same time, so that the maximum utilization of the COF can be achieved. The PMIA and the PCOF are simultaneously introduced into the composite nanofiber membrane provided by the invention, so that the ionic conductivity and the lithium ion transference number of the solid electrolyte are favorably improved, and the composite nanofiber membrane is expected to be applied to preparation of the solid composite electrolyte.

The invention relates to the field of packaging materials, and particularly discloses a degradable environment-friendly electric insulation plastic packaging bag and a preparation method thereof. The degradable environment-friendly electric insulation plastic packaging bag is prepared from the following raw materials in parts by weight: 100 parts of polylactic acid, 1-4 parts of organic zirconium phosphate, 2-5 parts of hydrophobic modified cellulose nanocrystals, 4-10 parts of polyimide / aluminum fluoride composite nanofibers, 1-3 parts of a dispersing agent, 1-4 parts of an antioxidant, 3-5 parts of inorganic filler, 1-3 parts of a slipping agent, 1-3 parts of an antistatic agent and 3-5 parts of a flame retardant. The packaging bag can be used for objects with high requirements for electrical insulation, has high electrical insulation capacity at high temperature, and is high in transparency and mechanical property.

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 invention discloses an MXene composite nanocellulose liquid crystal intelligent color-changing material as well as a preparation method and application thereof. The main components of the intelligent color-changing material comprise nanocellulose liquid crystal with a self-assembly structure and an MXene two-dimensional nanosheet. By compounding the MXene two-dimensional nanosheet with the nanocellulose liquid crystal phase, the MXene two-dimensional nanosheet can be used as a broadband absorbent and a black substrate to remarkably improve the color saturation of the nanocellulose liquid crystal; meanwhile, due to the two-dimensional nanosheet morphology, high photo-thermal conversion efficiency and high conductivity of MXene, the MXene composite nanocellulose liquid crystal intelligent color-changing material is flexible and adjustable in initial color, color-changing response speed, color-changing response sensitivity and color changing range. Based on the excellent characteristics of the nanocellulose liquid crystal and the MXene two-dimensional nanosheet, the MXene composite nanocellulose liquid crystal intelligent color-changing material has color change response to various stimulation factors such as environment temperature change, electric field change, magnetic field change, illumination and external applied stress.

The invention discloses a radiation refrigeration nanofiber membrane composite garment fabric and a preparation method thereof.Polyvinylidene fluoride-co-hexafluoropropylene is adopted as a matrix, nano silicon dioxide particles are added, and a P (VDF-HFP / SiO2 composite nanofiber membrane is prepared. Vinyl acetate copolymer EVA hot melt adhesive non-woven fabric is adopted as a middle layer, and a nanofiber membrane and a common fabric are compounded through a hot pressing process, so that the prepared composite material not only shows excellent radiation refrigeration capacity, but also enhances moisture absorption and sweat releasing functions by means of unique structural attributes of the nanofiber membrane, and has good radiation refrigeration performance. According to the radiation refrigeration nanofiber membrane and garment fabric composite material, excellent air permeability is maintained, and meanwhile, a more effective cooling effect is achieved, so that the radiation refrigeration nanofiber membrane and garment fabric composite material is particularly suitable for producing high-performance garments, and is particularly suitable for outdoor thermal management and sun protection garments.

The invention 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, and spinning to obtain a polyacrylonitrile nanofiber membrane; then, the polyacrylonitrile nanofiber membrane is soaked in a trihydroxymethyl aminomethane hydrochloride solution containing dopamine; soaking the dopamine-coated fiber membrane in a mixed solution containing a copper salt or a silver salt, and then soaking the dopamine-coated fiber membrane in a reaction solution to obtain a modified nanofiber membrane; then spraying a dispersion liquid containing a conductive filler onto the modified nanofiber membrane to obtain a conductive filler modified nanofiber membrane; and finally, dissolving polyurethane into a solvent, and spinning by taking the conductive filler modified nanofiber membrane as a receiver to obtain the composite nanofiber membrane. The composite nanofiber membrane has excellent electromagnetic shielding performance, directional perspiration ability, air permeability, photothermal conversion ability, antibacterial property, mechanical strength and flexibility.

The invention relates to the technical field of functional materials, in particular to a flexible Cu2O-Cu-C composite nanofiber membrane and a preparation method and application thereof.The preparation method includes the following steps that firstly, copper acetate and PAN are dissolved in a solvent to obtain an electrostatic spinning solution, the mass fraction of the PAN in the spinning solution is 7-9%, and the mass ratio of the copper acetate to the PAN is (1.9-2.5): 7; 2, obtaining a PAN / Cu < 2 + > nanofiber membrane by adopting the electrostatic spinning solution in the step 1 through an electrostatic spinning process; 3, carrying out heat treatment on the PAN / Cu < 2 + > nanofiber membrane; step 4, pre-oxidizing and carbonizing the PAN / Cu < 2 + > nanofiber membrane subjected to heat treatment to prepare a Cu2O-Cu-C nanofiber membrane; and step 5, carrying out hydrophilic treatment on the Cu2O-Cu-coated C nanofiber membrane, so as to obtain the hydrophilic flexible Cu2O-Cu-coated C nanofiber membrane. The preparation method disclosed by the invention is simple, low in energy consumption in the preparation process, low in equipment requirement, low in toxicity and free of potential safety hazards, is sufficient in moisture supplement in the aspect of light-heat water evaporation, can be recycled and has a very good practical application prospect.

The invention relates to the technical field of electrostatic spinning, in particular to a preparation method, a product and application of a composite nanofiber membrane. The preparation method comprises the following steps: depositing a liquid metal nanoparticle suspension and a polymer solution on a collection plate in electrostatic spraying and electrostatic spinning modes to prepare a base material; and carrying out ultrasonic impregnation on the matrix material to obtain the uniformly dispersed liquid metal nanoparticle composite nanofiber membrane. According to the preparation method combining electrostatic spinning with electrostatic spraying, liquid metal nanoparticles are anchored to the fibers, the particles and the fibers can intersect in the air under the action of a conjugate electric field, and therefore the particles can be loaded in the fibers more evenly. The ultrasonic impregnation method improves the loading capacity of the liquid metal nanoparticles on the surface of the liquid metal nanoparticle composite nanofiber, and the two processes supplement each other to promote uniform dispersion of the liquid metal nanoparticles in the fiber.

The invention provides a flexible ceramic nanofiber membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: adding polyvinyl alcohol into water, and heating and stirring in a water bath kettle until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution; stirring the precursor material, an acid catalyst and water until hydrolysis to obtain oxide substrate sol; mixing a polyvinyl alcohol solution with the oxide substrate sol, adding a pore forming agent, uniformly mixing, and performing electrostatic spinning to obtain a precursor composite nanofiber membrane; and calcining the precursor composite nanofiber membrane at high temperature to obtain the flexible ceramic nanofiber membrane. According to the prepared flexible ceramic nanofiber membrane, fibers are in a shape similar to sugarcoated haws on sticks, the porosity is high, based on the charge property of the flexible ceramic nanofiber membrane, in the water-induced power generation process, counter ions are generated on the solid-liquid contact surface in an electrolyte aqueous solution and a ceramic fiber channel, and the water-induced power generation efficiency is improved. Good flexibility and stability are shown through flowing potential driving, continuous power generation can be achieved, and high output voltage is obtained.

The invention discloses a minimally invasive flexible piezoelectric-triboelectric hybrid nanometer nerve stimulation device and application thereof.The middle layer of the nerve stimulation device is a PVDF / TMCM-MnCl3 composite nanofiber membrane, Au electrodes are evaporated on the two faces of the PVDF / TMCM-MnCl3 composite nanofiber membrane, two gold wire or copper wire electrodes are connected with the Au electrodes respectively, and the two gold wire or copper wire electrodes are connected with the Au electrodes respectively. The surface of the Au electrode is subjected to primary packaging by adopting a PU waterproof film, and the surface of the PU waterproof film is subjected to secondary packaging by adopting PDMS. The nerve stimulation device is used for conventional treatment of SIRS. The vagus nerve stimulator can generate an adjustable current up to 0.85 mA under programmable ultrasonic driving, and can be directly used for VNS. The PTNG is ultrasonically driven in vitro to assist the VNS in treating lipopolysaccharide-induced SIRS rats, release of inflammatory factors such as TNF-alpha, IFN-gamma and IL-1beta can be effectively reduced, cytokine storm is relieved, and multi-organ tissue damage and dysfunction are relieved, so that the survival hope is improved.

The invention belongs to the field of air purification, and particularly discloses a single-layer nanofiber membrane with a directional liquid transmission function and a preparation method thereof.The preparation method comprises the steps that polyacrylonitrile is added into N, N-dimethylformamide to obtain a spinning solution A1, and titanium dioxide nanoparticles are added into N, N-dimethylformamide to obtain dispersion liquid A2 of the titanium dioxide nanoparticles; a2 is added into A1, and a spinning solution B1 is obtained; b1, preparing a hydrophilic composite nanofiber membrane through an electrostatic spinning method, and adding a perfluoro reagent into cyclohexane to obtain a perfluoro modified solution; the preparation method comprises the following steps: immersing a hydrophilic composite nanofiber membrane into a modified solution, sealing and dipping in a dark place, taking out and drying to obtain a hydrophobic composite nanofiber membrane, placing the hydrophobic composite nanofiber membrane in a dark closed space, and irradiating under an ultraviolet lamp to obtain a single-layer nanofiber membrane with a directional liquid transmission function; the obtained nanofiber membrane has the characteristics of excellent one-way moisture conduction capability, good air permeability, high filtering efficiency and the like.

The invention provides a ternary composite nanofiber capable of being used for marine metal corrosion prevention and electromagnetic wave absorption and a preparation method and application of the ternary composite nanofiber. The preparation method of the ternary composite nanofiber comprises the following steps: (1) preparation of a precursor solution: dispersing a copper salt and a cobalt compound in a first solvent, stirring until the copper salt and the cobalt compound are fully dissolved, adding a polymer, and uniformly mixing to obtain the precursor solution; (2) preparation of a nanofiber membrane: performing electrostatic spinning on the precursor solution to obtain the nanofiber membrane loaded with copper and cobalt metal ions; and (3) carbonization: drying the nanofiber membrane, and performing high-temperature treatment after drying to obtain the ternary composite nanofiber capable of being used for marine metal corrosion prevention and electromagnetic wave absorption. The preparation method of the ternary composite nanofiber is simple and low in cost, and the prepared ternary composite nanofiber has a huge application prospect when being used for electromagnetic wave shielding in corrosion environments such as ocean.

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 belongs to the technical field of electromagnetic wave absorption, and particularly relates to a heterogeneous electromagnetic wave absorption composite nanofiber and a preparation method thereof, and the composite nanofiber comprises a matrix formed by carbon nanofibers and CoS2 nanoparticles dispersed on the surface or inside the carbon nanofibers in an embedded form. The composite nanofiber disclosed by the invention shows excellent electromagnetic wave absorption performance in a relatively wide frequency range, the minimum reflection loss reaches-59.84 dB, the effective absorption bandwidth is 4.9 GHz, and particularly, the composite nanofiber shows excellent wave absorption performance in an X wave band (8-12 GHz). Therefore, the material is suitable for electromagnetic wave interference suppression and information security protection of electronic equipment. In addition, the material is prepared through electrostatic spinning and a high-temperature treatment process, the process is simple and extensible, large-scale production is easy to achieve, and the material has high industrial application potential.

The invention discloses a CA (cellulose acetate) / MWCNTs (multi-walled carbon nanotubes) / PANI (polyaniline) electromagnetic shielding film and a preparation method thereof. The electromagnetic shielding film is formed by taking cellulose acetate and MWCNTs (multi-walled carbon nanotubes) as electrostatic spinning precursors and combining polyaniline grown by in-situ polymerization; the composite nanofiber membrane comprises CA composite nanofibers with MWCNTs as an internal filler, and PANI nanoparticles generated by oxidative polymerization of aniline are coated and stacked on the surface of a CA / MWCNTs fiber network to form a three-dimensional conductive network. The method comprises the following steps: preparing a CA / MWCNTs fiber template in a high-voltage electric field through an electrostatic spinning method; carrying out self-assembly on the CA composite fiber membrane loaded with the MWCNTs and a mixed solution containing an aniline monomer through a solution impregnation method; a micro-nano network structure with PANI nanoparticles coated on CA / MWCNTs fibers in situ is formed by adopting chemical in-situ oxidative polymerization. The CA / MWCNTs / PANI thin film shields electromagnetic waves, a formed conductive network is beneficial to conduction loss of the electromagnetic waves, a formed heterogeneous interface between the PANI nano particles and CA / MWCNTs fibers is beneficial to polarization loss of the electromagnetic waves, and the MWCNTs filler and polymerized PANI improve the mechanical performance of the thin film.

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 provides a method for preparing an modacrylic-LLZTO composite solid electrolyte membrane from a waste modacrylic material and application of the modacrylic-LLZTO composite solid electrolyte membrane. The method comprises the following steps: firstly, washing and drying pre-recovered waste modacrylic; the preparation method comprises the following steps: firstly, preparing an N, N-dimethylformamide solvent, then uniformly dispersing modacrylic, LLZTO and LiTFSI in the N, N-dimethylformamide solvent to prepare a spinning precursor solution, and then preparing an organic-inorganic composite nanofiber membrane (modacrylic-LLZTO NFS) through an electrostatic spinning technology; finally, an organic-inorganic system (PEO / SN) mixed solution is poured on the modacrylic-LLZTO NFS through a solution pouring method to obtain the modacrylic-LLZTO composite solid-state electrolyte membrane with the double-lithium-salt system, the material has good tensile flexibility and can be bent and folded, and when the material serves as a solid-state electrolyte of an all-solid-state lithium metal battery, the excellent ion transmission performance is shown, and the service life of the all-solid-state lithium metal battery is prolonged. And the requirement of long-period use is met.

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.