294 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 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 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 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 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 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 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 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 a preparation method of a continuous self-supporting electrostatic spinning nanofiber membrane, which is characterized by comprising the following steps: S1, preparing a polymer and the like into a to-be-spun solution, and putting the to-be-spun solution into a liquid pushing system; s2, the base material is arranged on a conveying device, and nanofibers are received; s3, adjusting the voltage and the rotating speed of the transmission device to a proper interval; s4, the drying unit starts to dry and remove the solvent of the base material and the nanofiber membrane; and S5, after passing through the stripping unit, the fiber membranes are collected by the winding unit. According to the method, the function of processing the composite nanofiber membrane material is realized by utilizing a set of technological process, and synchronous stripping of the nanofiber membrane and the base material is completed; and meanwhile, the recycled base material can be repeatedly used, so that the production cost is reduced.

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 invention discloses a polyimide composite nanofiber membrane for a lithium ion battery diaphragm and a preparation method of the polyimide composite nanofiber membrane, polyimide is modified by selecting ionic liquid, orthosilicate is added for hydrolysis to form a cross-linked structure, and the polyimide composite nanofiber membrane is prepared by adopting a high-voltage electrostatic spinning method. The obtained polyimide composite nanofiber membrane has high porosity and liquid absorption rate and excellent heat resistance, and the ionic conductivity is not lower than 1.2 * 10 <-3 > S / cm.

The invention discloses a preparation method of polyimide / titanium dioxide composite hollow nanofiber aerogel, which comprises the following steps: by taking a polyamide acid solution as a shell layer spinning solution and a pore-foaming agent solution as a core layer spinning solution, preparing a polyamide acid composite nanofiber solution through a coaxial electrostatic spinning process; further drying to remove the solvent to obtain polyamide acid composite nanofibers; stirring and dispersing the polyamide acid composite nanofibers in a titanium compound aqueous solution to obtain a nano short fiber mixed dispersion liquid; the nano short fiber mixed dispersion liquid is hydrolyzed in deionized water, freeze drying and high-temperature treatment are carried out after hydrolysis, and the finished product is obtained.The specific surface area of the polyimide aerogel is increased through the pore-foaming agent, meanwhile, the density of the polyimide aerogel is reduced, the loading capacity of the titanium dioxide antibacterial agent is increased, and the better and longer antibacterial effect is achieved.

The invention belongs to the field of air purification, and particularly discloses a nanofiber membrane with a gradient wettability pore channel structure and a preparation method of the nanofiber membrane, hydrophobic titanium dioxide (F-TiO2) nanoparticles are doped in a polyacrylonitrile (PAN) spinning solution, and a hydrophobic composite nanofiber membrane is prepared by adopting an electrostatic spinning technology. The F-TiO2 nano-particles can respond under ultraviolet light to generate active free radicals to catalyze and decompose surface grafted perfluoro chain segments, so that the wettability gradually changes in the film thickness direction, and the nanofiber film with a gradient wettability pore channel structure is constructed.

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 provides a preparation method of a conductive temperature-regulating nanofiber core-spun yarn. The preparation method comprises the following steps: (1) preparing a composite nanofiber yarn with a skin-core structure; (2) preparing the phase change fasciated yarn; (3) preparing a chemical plating solution; (4) preparing conductive cotton yarns; and (5) preparing the conductive temperature-adjusting nanofiber core-spun yarn. The core spun yarn prepared by the invention has excellent conductivity and temperature regulation performance, and has wide application prospects in the fields of wearable electronic equipment, intelligent textiles, medical care and environmental protection.

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.