32 results about "Composite nanofibers" patented technology

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 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.

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.

This invention relates to a platinum-based high-entropy alloy core-shell catalyst supported on hollow carbon fibers and its preparation method, belonging to the fields of new energy nanomaterials and catalysis technology. The invention aims to solve the problems of low platinum atom utilization, insufficient exposure of active sites, and difficulty in balancing catalytic activity and stability in existing high-entropy alloy catalysts. The main approach involves constructing composite nanofibers from Pt, Cu, Ni, Co, and Zn metal precursors with polyacrylonitrile (PAN) and N,N-dimethylformamide using electrospinning technology. These nanofibers are then coated with a silica layer, followed by high-temperature pyrolysis under an Ar / H2 atmosphere and selective acid etching to enrich Pt on the surface. The resulting high-entropy alloy catalyst undergoes a secondary carbonization treatment to form a platinum shell layer in situ on its surface, thus preparing a platinum-based high-entropy alloy core-shell catalyst supported on hollow carbon fibers.

The application discloses a kind of composite nanofiber face masks and preparation method thereof, belong to skin care product technical field, composite nanofiber face mask includes fiber matrix and plant source active ingredient, plant source active ingredient includes one or more of rice bran extract, aloe extract and green tea polyphenol, fiber matrix includes polyvinyl alcohol and silk fibroin, the mass ratio of plant source active ingredient and fiber matrix is 10-18:100.The application uses the above-mentioned one kind of composite nanofiber face mask and preparation method thereof, and plant source active ingredient containing natural antibacterial component is physically embedded and dispersed in fiber interior or fiber network, relies on dry state storage and physical stabilization process, it is helpful to improve the dry state storage stability of product, and reduces the dependence on traditional preservative system.

This invention relates to the field of sensing technology, providing a method for preparing and applying a conductive nanofiber membrane. The preparation method includes: preparing a polycaprolactone / β-cyclodextrin / graphene composite nanofiber membrane by electrospinning; after amination treatment, sequentially constructing a conductive catalytic interface on its surface through gold seed adsorption and in-situ growth of gold nanowires; integrating the resulting functionalized membrane into the working electrode region of a three-electrode chip, and further bonding it with PDMS microfluidic channels to construct a biomimetic chamber. This invention combines a cell culture interface with an electrochemical sensing interface, enabling in-situ, real-time, and dynamic electrochemical monitoring of nitric oxide released by vascular endothelial cells in a microfluidic system simulating a physiological environment, providing an innovative technical means for real-time assessment of vascular endothelial function and related pathological research.

This invention discloses a method for preparing a blood purification dialysis membrane and its application, relating to the field of materials preparation technology. The method includes the following steps: S1, dissolving polyacrylonitrile powder in N-N-dimethylformamide solvent to obtain a PAN spinning solution; S2, spinning the PAN spinning solution using electrospinning to obtain a PAN nanofiber membrane; S3, depositing a multi-walled carbon nanotube solution into the interfiber gaps of the PAN nanofiber membrane to obtain a composite PAN nanofiber membrane; S4, subjecting the composite PAN nanofiber membrane to hot-pressing treatment to obtain the blood purification dialysis membrane. By combining electrospinning with multi-walled carbon nanotube deposition and hot-pressing processes, a composite membrane with a gradient pore size structure is constructed. This effectively removes small and medium-sized toxins while selectively retaining large-molecule proteins, solving the technical challenges of wide pore size distribution and difficulty in balancing toxin removal and protein retention in traditional dialysis membranes. It offers the advantages of precise membrane structure control and improved blood purification efficiency.

The application relates to the technical field of electrocatalysis, in particular to a nitrogen and sulfur doped carbon-based electrocatalytic material and a preparation method and application thereof. The application comprises the following steps: S1, obtaining silk fibroin, uniformly mixing the silk fibroin with a sulfur source, a spinning aid and an acidic solvent to form a spinning solution; S2, preparing the spinning solution into a composite nanofiber by adopting an electrostatic spinning method; S3, sequentially performing pre-oxidation treatment, carbonization treatment, pure water treatment and drying treatment on the composite nanofiber to obtain the nitrogen and sulfur doped carbon-based electrocatalytic material. The prepared nitrogen and sulfur doped carbon-based electrocatalytic material has the nanofiber structure characteristic and a large specific surface area, can significantly improve the catalytic activity, and makes the nitrogen and sulfur doped carbon-based electrocatalytic material have a wide application prospect in the fields of water electrolysis hydrogen production, oxygen production and the like.

The application relates to a preparation process of a high-comfort waterproof and moisture-permeable magnetic health-care fabric. The preparation process of the high-comfort waterproof and moisture-permeable magnetic health-care fabric comprises the following steps: preparation of a silane functionalized graphene dispersion liquid, preparation of magnetic nano Fe3O4 particles, preparation of silane functionalized graphene@Fe3O4 composite nanofibers, and fabric spinning. The spinning mainly comprises the following process steps: roughening, carding, drawing, combing, roving, spinning, warping, harnessing, weaving and the like. The silane functionalized graphene@Fe3O4 composite nanofibers are prepared by using the electrospinning technology, the smaller pore diameter and the interconnected porous characteristics in the micro-pore structure of the nanofibers enable the prepared health-care fabric to prevent liquid water penetration and diffuse a large amount of water vapor or sweat gas emitted by the human body, and the magnetic nano particles contained in the nanofibers enable the high-comfort waterproof and moisture-permeable magnetic health-care fabric prepared by using the method to have excellent magnetic health-care effect, waterproof and moisture-permeable performance and thermal comfort and the like.

This invention discloses a lanthanum-doped PCN / MXene composite nanofiber, using La as the dopant element. The composite nanofiber is composed of zero-dimensional TiO₂ nanoparticles derived from MXene nanosheets, La-based species, and one-dimensional porous nitrogen-doped carbon (PCN) nanofibers. The TiO₂ nanoparticles contain anatase and rutile phases, forming a biphase TiO₂ heterostructure. The composite nanofiber exhibits a reflection loss value below -10 dB. The preparation method includes the following steps: 1. Preparation of MXene nanosheets; 2. Preparation of lanthanum-doped PCN / MXene composite nanofibers. The mass ratio of lanthanum nitrate hexahydrate to MXene nanosheets is 1:1; the mass ratio of polyacrylonitrile to MXene nanosheets is 4:1. The resulting composite nanofiber, with a matching thickness of 1.95 mm, exhibits a reflection loss value of -61.55 dB and an effective absorption bandwidth of 5.7 GHz (12.3–18.0 GHz).

This invention discloses a high-strength, high-insulation aramid insulating paper for electrical equipment, its preparation method, and its application, comprising the following steps: Step 1: Aramid fibers are modified by plasma treatment to obtain modified aramid fibers, which are then impregnated in ZnO quantum dot seed solution and annealed to obtain aramid fiber A with ZnO nanowires on its surface; Step 2: Aramid nanofiber spinning solution and polyvinyl alcohol solution are mixed and electrospun to obtain composite nanofiber B; Step 3: A fiber pulp suspension solution of aramid fiber A and a fiber pulp suspension solution of composite nanofiber B are mixed, dehydrated, and then cured at high temperature to obtain the desired insulating paper; The insulating paper obtained by this invention has high interfacial bonding strength, stable structure, and significantly improved mechanical properties and insulation.

This invention discloses a porous graphene nanofiber, its preparation method, and its application, relating to the field of graphene technology. The nanofiber is composed of a three-dimensional network fibrous skeleton formed by reduced graphene oxide. The fiber has a continuous porous network structure, and graphene is uniformly dispersed within the fiber to form a conductive network. The porous network structure is formed by a metal-organic framework material as a pore-forming agent, which is removed after carbonization and acid washing. A spinning solution containing graphene oxide, a polymer, and a zeolite imidazole ester framework material pore-forming agent is prepared. The spinning solution is electrospinned to obtain composite nanofibers. The composite nanofibers are then subjected to pre-oxidation and carbonization treatments to obtain carbonized fibers. The carbonized fibers are acid-washed to form a porous structure, and after washing and drying, porous reduced graphene oxide nanofibers are obtained. This not only improves the energy density and power density of electrochemical energy storage devices but also effectively mitigates volume changes during ion insertion and extraction.

This invention relates to a bamboo-like silica / polyimide core-shell nanofiber aerogel and its preparation method. The aerogel uses bamboo-like silica as the core and polyimide as the shell. Core-shell nanofibers are obtained through coaxial electrospinning, followed by gelation, freeze-drying, and thermal imidization to form a three-dimensional porous network structure with interwoven support and cross-linking. The bamboo-like silica acts as a supporting and reinforcing skeleton within the fibers, improving the aerogel's compression resilience and structural stability, while also enhancing its flame-retardant and thermal insulation properties. The preparation method includes the preparation of a polyamic acid precursor solution, acidic hydrolysis of the silica precursor solution, coaxial electrospinning to form core-shell fibers, pre-imidization, and subsequent thermal imidization steps. The resulting aerogel exhibits low density, high porosity, low thermal conductivity, and excellent thermal stability, making it suitable for applications in thermal insulation, flame retardant protection, and lightweight structural materials.

The application relates to the technical field of lithium ion batteries, in particular to a NiCoC composite nanofiber material for a lithium ion battery and a preparation method thereof, which comprises the following steps: dispersing graphene oxide and carbon nanotubes in a functional modification solvent in advance, adding a precursor solution into the composite solution after ultrasonic treatment, preparing a nanofiber membrane through electrospinning under a high-voltage electric field, immersing the nanofiber membrane containing a nickel precursor into a cobalt nitrate methanol solution, and heat-treating the composite nanofiber membrane to obtain the NiCoC composite nanofiber material. Through a three-layer nested modification process, the functional modification solvent is rich in polar functional groups and coordination sites on the surface, can efficiently disperse graphene oxide and carbon nanotubes, solves the industry problems that carbon nanomaterials are prone to agglomeration and have poor interface compatibility, makes graphene oxide and carbon nanotubes uniformly distributed and mutually overlapped in the nanofiber, and forms a continuous three-dimensional conductive network.

The application relates to the technical field of lithium ion batteries, in particular to a NiCoC composite nanofiber material for a lithium ion battery and a preparation method thereof, which comprises the following steps: dispersing graphene oxide and carbon nanotubes in a functional modification solvent in advance, adding a precursor solution into the composite solution after ultrasonic treatment, preparing a nanofiber membrane through electrospinning under a high-voltage electric field, immersing the nanofiber membrane containing a nickel precursor into a cobalt nitrate methanol solution, and heat-treating the composite nanofiber membrane to obtain the NiCoC composite nanofiber material. Through a three-layer nested modification process, the functional modification solvent is rich in polar functional groups and coordination sites on the surface, can efficiently disperse graphene oxide and carbon nanotubes, solves the industry problems that carbon nanomaterials are prone to agglomeration and have poor interface compatibility, makes graphene oxide and carbon nanotubes uniformly distributed and mutually overlapped in the nanofiber, and forms a continuous three-dimensional conductive network.

This invention provides a continuous preparation apparatus and method for binary conductive polymer composite nanofibers. A dopant-containing aniline monomer solution and initiator solution, and a dopant-containing thiophene monomer solution and initiator solution are respectively injected into corresponding containers. Under gravity, the aniline monomer solution and its initiator solution flow into the main pipe through branch pipes, where they mix and polymerize to form polyaniline nanofibers. Subsequently, they continue to flow in the main pipe and mix with the thiophene solution and its initiator solution. Thiophene undergoes in-situ chemical oxidative polymerization on the surface of the polyaniline nanofibers, generating polyaniline / polythiophene composite nanofibers. After washing and drying, the polyaniline / polythiophene composite nanofibers are obtained. The entire flow and mixing process of this invention is achieved by gravity, eliminating the need for mixing and stirring devices and pumps; this avoids clogging of the solution during polymerization and greatly improves production efficiency.

This invention relates to the field of ferrite magnetic materials technology, specifically to a modified manganese tetroxide and its application in soft magnets. The invention provides a modified manganese tetroxide and its application in soft magnets, which utilizes electrospinning technology with polyvinylpyrrolidone as a fiber template to form a composite nanofiber material with zinc ferrite as the inner layer and manganese tetroxide and cobalt tetraoxide ferrite as the outer layer, i.e., a modified manganese tetroxide fiber material. Using this as the fiber skeleton, modified polysiloxane and silicone resin are used as encapsulating materials to construct a three-dimensional anisotropic soft magnetic composite material. This solves the contradictory problems of high eddy current loss and difficulty in simultaneously achieving saturation magnetic induction intensity and high-frequency permeability in traditional soft magnetic materials at high frequencies.

The application belongs to the technical field of urea oxidation catalysts, and specifically discloses a composite nanofiber web structure material, a preparation method and application thereof. 0.2 Mo 0.8 N, Ni3Mo3N; the metal is an iron group metal, and the iron group metal is nickel. The composite nanofiber web structure material and the preparation method and application thereof have high conductivity and high specific surface area, and are a urea oxidation catalyst with application prospects.

This application discloses a radiation-cooling nanofiber membrane composite clothing fabric and its preparation method. Using polyvinylidene fluoride-hexafluoropropylene as a matrix and adding nano-silica particles, a P(VDF-HFP / SiO2) composite nanofiber membrane is prepared. The nanofiber membrane of this application achieves enhanced synergistic cooling effect through radiation cooling mechanism and its composite application with clothing fabric. Using vinyl acetate copolymer EVA hot melt adhesive nonwoven fabric as an intermediate layer, the nanofiber membrane and ordinary fabric are composited through a hot-pressing process. The resulting composite material not only exhibits excellent radiation cooling capacity but also enhances moisture absorption and perspiration wicking function by utilizing the unique structural properties of the nanofiber membrane. This ensures that while maintaining excellent breathability, a more effective cooling effect is achieved. Therefore, the radiation-cooling nanofiber membrane and clothing fabric composite material is particularly suitable for producing high-performance clothing, especially for outdoor thermal management and sun protection clothing.

This invention relates to the field of functional polymer materials and discloses a method for preparing an antibacterial composite nanofiber material with cascade activity. The method includes: dissolving a gold precursor in a solvent; adding a polymer to obtain a polymer solution; reacting with a sodium borohydride solution; electrospinning to obtain an Au composite nanofiber membrane; dissolving TCPP in a mixed solvent of N-N-dimethylformamide / ethanol; adding Cu₂O, polyvinylpyrrolidone, and trifluoroacetic acid; reacting to obtain Cu-TCPP; adding the Cu-TCPP dispersion to the surface of the Au composite nanofiber membrane under vacuum filtration; and drying. In the antibacterial composite nanofiber material of this invention, Cu-TCPP is stably anchored on the surface of the nanofiber membrane, preventing excessive encapsulation of Cu-TCPP and thus reducing the therapeutic effect. In a weakly alkaline environment conducive to infection, this antibacterial composite nanofiber material can utilize Au nanozymes as initial enzymes to continuously catalyze the production of gluconic acid and H₂O₂ from glucose, thereby activating the POD-Like activity of Cu-TCPP to catalyze the generation of hydroxyl radicals to kill bacteria.

The application discloses a continuous preparation method of electrospinning aerogel sheets, and belongs to the technical field of aerogel materials. The method comprises the following steps: S1, preparing a spinning solution containing a fiber-forming polymer, an aerogel precursor and a solvent; S2, spraying the spinning solution onto a continuously conveyed receiving substrate by electrospinning to form a composite nanofiber membrane; S3, in-situ gelation treatment is performed on the composite nanofiber membrane in an acidic or alkaline atmosphere environment, so that the aerogel precursor on the fiber surface and between the fibers is converted into an aerogel phase, and a wet-state sheet material composed of a fiber skeleton and an aerogel phase is obtained; and S4, after drying, continuous winding is performed to obtain an electrospinning aerogel sheet. The application realizes the continuous production of the electrospinning aerogel sheet, has low process energy consumption, does not need high-temperature treatment, and the obtained product has an elastic network structure composed of a fiber skeleton and an aerogel phase, and has the advantages of ultralightness and mechanical flexibility, and can be used in the fields of heat insulation and protection, buffering and shock absorption and the like.

This invention provides a bilayer composite nanofiber membrane with photothermal conversion function and its preparation method, which is composed of a self-floating polymer fiber layer and a composite nanofiber layer. The composite nanofiber layer includes a three-dimensional porous thermoplastic polymer nanofiber membrane formed by cross-linking thermoplastic polymer nanofibers, and photothermal nanoparticles completely encapsulated within the thermoplastic polymer nanofibers. This bilayer composite nanofiber membrane possesses good self-floating properties, excellent mechanical properties, a fast water transport rate, and excellent photothermal conversion performance. This invention prepares an integrated photothermal composite nanofiber, effectively solving the problem of easy detachment of particulate coating materials. Furthermore, the bilayer membrane structure is simple, and using nanofibers as the raw material for the photothermal conversion layer reduces heat loss.

This invention provides a bismuth-containing composite fiber, its preparation method, and its applications. Specifically, this invention provides a bismuth-containing composite fiber, which is a polymer electrospun fiber with bismuth-bismuth oxide particles doped on its surface and / or internally. The polymer comprises a first polymer and a second polymer. The blending of the two polymers not only imparts excellent mechanical strength to the composite fiber but also ensures its biodegradability and biocompatibility. The introduction of bismuth-bismuth oxide particles endows the nanofiber with functional properties, enabling it to generate reactive oxygen species under ultrasound, achieving highly efficient antibacterial effects and thus meeting the customized functional requirements for antibacterial treatment on wound surfaces. The bismuth-containing composite fiber prepared by this invention has advantages such as good biocompatibility, excellent antibacterial effect, high mechanical strength, and low bioirritation, showing promising application prospects in biomedical fields such as wound dressings.

This invention discloses a wound healing dressing containing a probiotic and high-quality protein composite system and its preparation method, belonging to the field of biomedical materials technology. The dressing of this invention consists of a three-layer structure: an active functional layer, a nanofiber support layer, and an isolation and protective layer. The active functional layer contains probiotics self-assembled and microencapsulated in a sodium alginate-chitosan-hyaluronic acid layer and a mixed protein hydrogel composed of recombinant human type I collagen, whey protein hydrolysate, and silk fibroin, cross-linked with transglutaminase. The nanofiber support layer is a polycaprolactone / gelatin composite nanofiber membrane modified by oxygen plasma hydrophilicity. The isolation and protective layer is a medical polyurethane membrane. This invention achieves efficient loading and long-lasting sustained release of probiotics at the wound site through a multi-layer structure. The protein hydrogel possesses excellent mechanical properties and suitable swelling characteristics. The dressing exhibits good antibacterial activity and cell compatibility, effectively promoting the healing of chronic, difficult-to-heal wounds.

The application discloses a kind of cross electrospinning composite nanofiber membrane and its preparation method and application.The membrane is with food-grade polymer ethyl cellulose and pullulan as base material, is prepared using cross electrospinning technology, and can load Nisin, oregano oil or probiotic bacteria.Ethyl cellulose provides hydrophobic support, and pullulan strengthens mechanical properties.The membrane has significant antibacterial activity on staphylococcus aureus after loading Nisin, and can be applied to strawberry preservation and preservation;On this basis, the introduction of oregano oil and Nisin compatibility can synergistically enhance the antibacterial and antioxidant properties of cross electrospinning membrane, which can effectively prolong the shelf life of chicken.In addition, when the membrane is used to load probiotic bacteria, it can improve the survival rate of bacterial cells in storage and simulated gastrointestinal fluid, achieve colon-targeted delivery, and affect intestinal flora metabolism.The application has antibacterial, preservation and probiotic protection functions, and has application prospect in the field of active food packaging and functional carrier.

The application discloses a lithium battery diaphragm prepared by coaxial parallel electrospinning, a method and application. The method comprises the following steps: S1, dissolving a fiber skeleton polymer and a fiber functional polymer in organic solutions respectively to form uniform core layer parallel solutions A and B; S2, dissolving a metal salt in a water solution containing a hydrophilic polymer to form a uniform shell layer spinning solution; S3, coaxial parallel electrospinning the core layer parallel solutions A and B and the shell layer spinning solution, and preparing a composite nanofiber membrane with metal salt nano-aggregates by means of interface effect; and S4, immersing the prepared composite nanofiber membrane in an alkali salt solution to cause an anion exchange reaction, then drying into a film, and then immersing the film in an acetonitrile solution containing TAPB and DHTP to react at room temperature. The prepared lithium battery diaphragm can eliminate resource waste and safety problems caused by thermal runaway of lithium batteries, and has important significance for development and application of lithium battery diaphragms.

A method for preparing and applying nano-iron polyacrylonitrile composite nanofiber mat is disclosed, relating to the field of dyeing and printing wastewater treatment. The preparation method includes the following steps: adding polyacrylonitrile to N,N-dimethylformamide and stirring to dissolve it to obtain a polyacrylonitrile solution; adding FeCl3 to the polyacrylonitrile solution and ultrasonically dispersing it uniformly to obtain a mixed solution; stirring the mixed solution at room temperature until it is fully mixed to obtain an electrospinning precursor solution; electrospinning the electrospinning precursor solution to obtain a polyacrylonitrile composite nanofiber mat loaded with ferric iron; and in-situ reducing the ferric iron-loaded polyacrylonitrile composite nanofiber mat to obtain nano-iron polyacrylonitrile composite nanofiber mat. This composite material is applied to the catalytic degradation of dyeing and printing wastewater, and can efficiently purify complex dye wastewater. Its composite catalyst has high reactivity, is easy to recover and reuse, and has broad development prospects.

This invention discloses a core-shell composite piezoelectric fiber material and its preparation method. The invention first prepares a core-shell composite nanofiber with PVDF-TrFE as the shell and PC as the core using a coaxial spinning process. Using PC as the core increases the elastic modulus of the composite piezoelectric fiber, resulting in a larger piezoelectric potential than pure PVDF-TrFE fibers under the same strain. Simultaneously, PC forms hydrogen bonds at the interface with PVDF-TrFE, increasing the crystallinity of the PVDF-TrFE shell and thus improving the piezoelectric properties. The core-shell composite piezoelectric fiber has a d... 33 The piezoelectric coefficient can reach 49.1 pC N. ‑1 It is 110% higher than that of pure PVDF-TrFE.

This invention relates to the field of fiber membrane technology, and more particularly to an elastic piezoelectric SBS-PAN nanofiber membrane and its preparation method. The method uses SBS as the elastic matrix and PAN with polar cyano groups as the functional component, and prepares an SBS-PAN composite nanofiber membrane through electrospinning. This fiber membrane fully combines the flexibility of SBS and the polar response characteristics of PAN within the fiber network, thereby achieving a synergistic effect of the two materials' properties. Subsequent heat treatment can fully volatilize residual solvents inside the fiber membrane and release internal stress, effectively improving the orientation regularity of polar groups and the stability of the interfacial structure, thus inducing a significantly enhanced piezoelectric-dielectric coupling effect. Results show that the SBS elastic matrix combined with the PAN piezoelectric phase and subsequent heat treatment enable the SBS-PAN fiber membrane to exhibit excellent comprehensive electrical and acoustic-electric conversion properties.