1004 results about "Electrospinning" patented technology

The invention discloses an injectable material for promoting bone regeneration through piezoelectric and conductive integrated nanofiber hydrogel with ultrasonic response and a preparation method of the injectable material. The injectable material is composed of piezoelectric and conductive nanofibers and hydrogel. Wherein the piezoelectric conductive nanofiber is prepared from an inorganic piezoelectric material and a piezoelectric polymer through electrostatic spinning, or is prepared from an inorganic / organic composite piezoelectric material and a biological material with conductive performance through electrostatic spinning.

The invention discloses a novel textile material with eiderdown wrapped by rainbow yarn nanofibers and a preparation method. The novel textile material comprises skeleton fibers located at the axis, an eiderdown component with a heat preservation effect and a rainbow yarn nanofiber reinforcing layer wrapping the outer surface of the eiderdown component. The wrapping reinforcing layer is of a three-dimensional network structure formed by continuous or quasi-continuous nanofibers in a winding, interweaving and lap joint mode, so that stable compounding and structural shaping of down feather components and skeleton fibers are achieved under the condition that the down feather components and the skeleton fibers do not depend on adhesive fixation. The preparation method comprises the following steps: cleaning, drying and opening down for pretreatment; performing melt differential electrostatic spinning on the polymer melt under a high-voltage electrostatic field to form rainbow yarn nanofibers; the down flocs are introduced into the coating area through the framework fibers, so that the rainbow yarn nanofibers are deposited and wound to form a coating reinforcing layer; after being gathered and shaped and twisted into yarns, the yarns can be continuously dragged and wound. The novel textile material has spinnability, structural stability and long-acting thermal insulation performance, and is suitable for spinning, weaving and knitting processing.

The invention belongs to the field of composite materials, and particularly relates to a nanofiber radiation refrigeration heat insulation film with a bionic multilayer structure. The device sequentially comprises a bionic anti-reflection layer, a solar spectrum reflection layer, a nanofiber porous heat insulation layer and an atmospheric window radiation layer from outside to inside, the bionic anti-reflection layer is a sub-wavelength nano bulge array simulating a moth eye structure and is formed on the outer surface of the solar spectrum reflecting layer; the solar spectrum reflecting layer is a polymer film doped with high-reflectivity nanoparticles; the nanofiber porous heat insulation layer is a porous membrane formed by interweaving polymer nanofibers prepared by an electrostatic spinning technology; the atmospheric window radiation layer is a functional layer formed by coating or blending high-emissivity inorganic nanoparticles on the inner surface of the nanofiber porous heat insulation layer; the film integrates bionic antireflection, high sunlight reflection, efficient heat radiation and physical heat insulation, and efficient, stable and flexible daytime radiation refrigeration is achieved.

The invention discloses a method for preparing micro-nano fibers through needle-free electrostatic spinning equipment assisted by an ion blower gun, and belongs to the technical field of spinning. The method specifically comprises the following steps: S1, dissolving a high-molecular polymer in a proper solvent to prepare a spinning precursor solution; and S2, preparing the micro-nano fiber from the spinning solution on a suitable collection surface by using an ion blower gun assisted needleless electrostatic spinning device. Through the synergistic effect of directional airflow generated by the ion blower gun and a controllable electric field, fiber surface charges are effectively neutralized, the jet instability is inhibited, and the controllability of a fiber flight path is improved. Meanwhile, the ionic wind assists in enhancing interface attachment between the fiber and the collector, uniform deposition is promoted, and the compactness and adhesive force of the fiber membrane are remarkably improved. According to the method, chemical modification does not need to be carried out on a material system, the intrinsic performance of the fiber is kept, universality and expandability are achieved, and a new path is provided for continuous preparation of the high-performance micro-nano fiber.

The invention belongs to the technical field of waterproof and moisture permeable membrane materials, and particularly relates to a bio-based microporous membrane based on a template and a preparation method and application thereof, and the preparation method comprises the following steps: dispersing one of polybenzimidazole, aminated PI and carboxylated PBO and modified CNF into a DMF / water system; performing electrostatic spinning on the high-viscosity spinning solution; carrying out low-temperature vacuum drying treatment on the modified nanofiber self-supporting framework; coating and filling the bio-based polyurethane resin into the bio-based microporous membrane template, and carrying out negative pressure adsorption until the filling is uniform; and carrying out gradient drying on the bio-based wet membrane to obtain the bio-based microporous membrane. Compared with the prior art, the problems that in the prior art, the mechanical property or stability of bio-based polyurethane is insufficient, and a nanofiber reinforcing technology is difficult to combine with the bio-based polyurethane are solved. A nanofiber self-supporting framework with a stable structure is prepared through an electrostatic spinning technology, and then the nanofiber self-supporting framework is compounded with bio-based polyurethane to form a microporous membrane layer with waterproof and moisture permeable functions.

The invention discloses a flexible lanthanum zirconate-alumina fiber membrane as well as a preparation method and application thereof, and belongs to the technical field of inorganic nonmetal ceramic fiber materials. The preparation method comprises the following steps: dissolving zirconium oxychloride octahydrate, lanthanum chloride heptahydrate and aluminum chloride hexahydrate into absolute methanol, sequentially adding acetylacetone and triethylamine, stirring, and drying under reduced pressure to obtain a zirconium-lanthanum-aluminum polymer precursor containing triethylamine hydrochloride; soaking the zirconium-lanthanum-aluminum polymer precursor containing triethylamine hydrochloride in acetone, standing, filtering, concentrating under reduced pressure, and drying to obtain a zirconium-lanthanum-aluminum acetylacetone polymer precursor; the preparation method comprises the following steps: preparing a spinning solution from a zirconium-lanthanum-aluminum acetylacetone polymer precursor, absolute methanol serving as a solvent and polyoxyethylene serving as a spinning aid, and carrying out electrostatic spinning on the spinning solution to obtain a lanthanum zirconate-aluminum oxide precursor fiber membrane; and performing heat treatment on the lanthanum zirconate-aluminum oxide precursor fiber membrane to obtain the flexible lanthanum zirconate-aluminum oxide fiber membrane. According to the preparation method, acetylacetone is added into zirconium oxychloride, lanthanum chloride and aluminum chloride for coordination to form a linear zirconium-lanthanum-aluminum acetylacetone polymer, so that the technical problem that lanthanum zirconate long fibers with high strength and good flexibility are difficult to obtain is solved.

The invention discloses an anisotropic electrostatic spinning patch with ultrasonic response and a preparation method thereof, a fiber membrane with a controllable anisotropic structure is constructed by a biodegradable polymer, antibacterial nanoparticles and a photoinitiator system through a step-by-step directional electrostatic spinning process, so that the mechanical matching property of the fiber membrane is improved; cell growth can be directionally guided and tissue regeneration can be accelerated by combining the piezoelectric material characteristics of the introduced biodegradable polymer with piezoelectric characteristics and electric field stimulation induced by the fiber topological structure; meanwhile, a zwitterionic coating is generated on the surface of the fiber membrane in situ by utilizing a single-sided photocuring technology, and an anti-adhesion function is realized on the single side of the fiber membrane. Furthermore, the soft tissue repair patch which has multiple functions of adjustable mechanical property, infection resistance, adhesion resistance and the like and has better structural mechanical suitability, function integration and tissue regeneration guiding capability is prepared by adopting the anisotropic electrostatic spinning patch with ultrasonic response.

The invention discloses a preparation method and application of samarium-doped lanthanum ferrite nanofibers, and the preparation method is a design thought based on synergistic interaction of'defect engineering 'and'morphology control': samarium (Sm) ions with a specific proportion are creatively introduced to the A site of LaFeO3, and lattice distortion is induced by utilizing radius mismatch between the samarium (Sm) ions and lanthanum (La) ions; therefore, high-concentration gas-sensitive active sites (oxygen vacancies) are generated in the intrinsic structure of the material; and the material is constructed into a one-dimensional nanofiber network with a high specific surface area through an electrostatic spinning technology, so that the exposure efficiency of active sites is maximized.

The embodiment of the invention discloses a preparation method of a solid electrolyte membrane and the solid electrolyte membrane. The preparation method of the solid electrolyte membrane comprises the following steps: providing a composite fiber solution, a thermoplastic elastomer solution, a solid electrolyte matrix and a positive electrode material; performing coaxial electrostatic spinning treatment on the composite fiber solution and the thermoplastic elastomer solution to obtain a fiber adhesive; carrying out ball milling treatment on the fiber adhesive, the solid electrolyte matrix and the positive electrode material to obtain a fibration mixture; and carrying out hot rolling treatment on the fiberized mixture to obtain the solid electrolyte membrane. According to the preparation method provided by the invention, the fiber adhesive prepared from the composite fiber and the thermoplastic elastomer, the solid electrolyte matrix and the positive electrode material are subjected to ball milling and hot rolling treatment, so that the interface contact between the cathode and the electrolyte is optimized, the interface impedance is reduced, the cyclic stress is relieved, and the generation of interface cracks is inhibited; the prepared solid electrolyte membrane is high in ionic conductivity and stable in structure.

The invention discloses a biodegradable flexible conductive high-hydrophobicity sensor substrate and a preparation method and application thereof.The preparation method comprises the steps that a polylactic acid electrostatic spinning solution and a chitosan / polyethylene oxide mixed electrostatic spinning solution are prepared on the basis of a safe and non-toxic food-grade material; the preparation method comprises the following steps: sequentially spinning by adopting an electrostatic spinning technology to form a sandwich structure flexible substrate, transferring a carbon nano tube conductive film, and tightly attaching the carbon nano tube conductive film to the surface of a polylactic acid layer of the sandwich structure substrate, thereby finally obtaining the flexible conductive high-hydrophobicity composite substrate. According to the invention, a hydrophobic-hydrophilic-hydrophobic sandwich structure is constructed through multi-layer electrostatic spinning, and a surface carbon nanotube conductive layer is cooperated, so that the substrate has high hydrophobicity, excellent conductivity and flexible tensile property. The preparation method has the characteristics of controllable process, low cost and environmental friendliness, and the obtained substrate is expected to have wide application prospects in the fields of food packaging, sensor substrates, intelligent wearing, health monitoring and the like.

The invention belongs to the field of biological medicine and material science, and particularly relates to an intelligent response type piezoelectric nanofiber dressing and a preparation method and application thereof. According to the preparation method, polyvinylidene fluoride-trifluoroethylene, a high polymer material and inorganic nanoparticles are blended and spun through an electrostatic spinning technology, and then a photo-thermal component coating is subjected to surface in-situ oxidation and self-polymerization, so that the composite fiber membrane is prepared. Under the stimulation of ultrasound (US) and near-infrared laser (Laser), the fiber membrane can cooperatively activate the piezoelectric effect and the photothermal effect, generate a dynamic electric field and local high temperature, realize multi-mode cooperative killing of bacteria (the antibacterial rate exceeds 99%), and simulate an endogenous electric field to promote cell migration and wound healing. The dressing has good mechanical properties (the Young modulus is 15-20 MPa), hydrophilicity (the contact angle is about 30 degrees), biocompatibility and stability, is suitable for treatment of chronic infected wounds such as diabetes mellitus and the like, and has the advantages of on-demand activation and intelligent response.

The invention discloses PU fiber toughened ultrathin hydrogel and a preparation method thereof.The preparation method includes the steps that S1, TPU particles are dissolved in a THF and DMF mixed solution and stirred overnight, a 10-20 wt% TPU electrostatic spinning solution is obtained, electrostatic spinning is conducted on the TPU electrostatic spinning solution, the TPU electrostatic spinning solution is collected on a customized metal plate, and a metal plate spun with PU fibers is obtained; s2, preparing a hydrogel precursor solution; and S3, absorbing the metal plate spun with the PU fibers on a spin coater or a blade coater, taking out the hydrogel precursor solution from the water bath kettle, rapidly dripping the hydrogel precursor solution on the PU fibers, and standing to obtain the PU fiber and hydrogel fused ultrathin hydrogel. The hydrogel prepared by the invention has super-strong stretchability in a large strain range of 0-600%, and realizes skin fitting adhesion and stable acquisition of multi-scale signals in human motion.

The invention provides a preparation method of a graphene carbon nanofiber film for oil-water separation, and relates to the field of oil-water separation membranes, and the preparation method comprises the following steps: mixing polyacrylonitrile powder and an N, N-dimethylformamide solution to obtain an electrostatic spinning solution; spinning through an electrostatic spinning machine to obtain a polyacrylonitrile fiber membrane; coating the polyacrylonitrile fiber film with the prefabricated graphene oxide dispersion liquid to obtain a graphene oxide / polyacrylonitrile composite film; carrying out pre-oxidation, activation and carbonization treatment on the composite film to obtain a graphene carbon nanofiber film; according to the method, the waste isostatic pressing graphite which is low in price and easy to obtain is adopted as the raw material, the ammonia activation means is combined, improvement is carried out on the basis of a Hummers method, graphene oxide is prepared, resource recycling is achieved, the isostatic pressing graphite waste generated in the production process is recycled and processed into a product with a high additional value, and therefore the purposes of reducing the production cost and saving resources are achieved.

The invention relates to the technical field of food fresh-keeping materials, and discloses a preparation method of an intelligent response degradable fruit and vegetable fresh-keeping film based on a Janus structure, the intelligent response degradable fruit and vegetable fresh-keeping film comprises a hydrophobic layer and a hydrophilic layer, the hydrophobic layer is an electrostatic spinning film formed by compounding eugenol-loaded ZIF-8 nano-particles and polylactic acid, and the hydrophilic layer is an electrostatic spinning film formed by compounding eugenol-loaded ZIF-8 nano-particles and polylactic acid. The hydrophilic layer is an electrostatic spinning membrane formed by compounding chitosan and gelatin, the surface of the hydrophobic layer is covered with the hydrophilic layer through an electrostatic spinning technology, the ZIF-8 nanoparticles are synthesized through a room-temperature stirring method, and synthesis raw materials are a 2-methylimidazole methanol solution and a zinc nitrate methanol solution. By means of the pH response characteristic of the ZIF-8 nano-particles, pH value change signals generated in the early stage of fruit and vegetable putrefaction can be sensitively captured, loaded antibacterial components are accurately released through ZIF-8 framework dissociation, targeted inhibition on putrefying bacteria is achieved, passive protection is converted into active intervention, the fruit and vegetable putrefaction process is effectively delayed, the fresh-keeping effect is improved, and the fresh-keeping time is prolonged.

The invention provides a directional moisture absorption and sweat releasing functional fabric and a preparation method thereof.The fabric comprises a sweat releasing and drying layer, a capillary moisture guiding layer and a hydrophilic moisture absorption layer from outside to inside, the hydrophilic moisture absorption layer is a cellulose acetate electrostatic spinning super-hydrophilic modified layer, the capillary moisture guiding layer is formed by weaving porous polyester yarn, and the hydrophilic moisture absorption layer is a super-hydrophilic modified cellulose acetate electrostatic spinning super-hydrophilic modified cellulose acetate electrostatic spinning super-hydrophilic modified cellulose acetate electrostatic spinning super-hydrophilic modified cellulose acetate electrostatic spinning super-hydrophilic modified fiber. The perspiration drying layer is a silane super-hydrophobic modified layer. Porous cross-section polyester fibers are prepared by adopting a washable template method, the moisture conductivity is improved, an electrostatic spinning cellulose acetate nanofiber membrane is subjected to super-hydrophilic modification, the sweat absorption rate is increased, the skin-friendly performance is improved, a sweat-releasing and drying layer is subjected to silane hydrolysis spraying and then heat treatment to form a super-hydrophobic siloxane coating, the surface dryness is enhanced, and the moisture absorption rate is increased. Unidirectional migration and rapid evaporation of sweat from inside to outside are achieved.

The invention discloses a super-hydrophobic heat insulation / radiation refrigeration integrated fabric and a preparation method thereof.The method comprises the steps that firstly, a heat insulation layer is constructed on a base fabric through electrostatic spraying, specifically, PU and SCA are dissolved in DMF, SiO2 aerogel is added to form spraying liquid, a three-dimensional network structure is formed between aerogel and fibers through the synergistic cross-linking effect of SCA and PU, the aerogel is firmly anchored, and the heat insulation layer is formed; the adhesive force and the washability of the coating are improved. PVDF-HFP and ZrO2 nano-particles are blended and spun to form a composite structure with nano-fibers wrapping ceramic particles, particle aggregation is avoided, and the radiation refrigeration and heat insulation performance of PVDF-HFP and ZrO2 nano-particles are synergistically exerted. Finally, a substrate-heat insulation-refrigeration three-dimensional composite structure is formed through hot pressing treatment, chemical bonding of all the layers is achieved through SCA, the fabric has the characteristics of high strength, abrasion resistance, hydrophobicity, heat insulation and radiation refrigeration, and the problem that durability and comfort of a traditional material are difficult to achieve at the same time is solved.

The invention relates to the technical field of biomedical materials, in particular to a degradable zinc-based composite GBR film with the surface loaded with a nanometer electrostatic spinning fiber coating and preparation and application of the degradable zinc-based composite GBR film. According to the degradable zinc-based composite GBR membrane with the surface loaded with the nano electrostatic spinning fiber coating, the nano fiber coating is implanted into the surface of a zinc-based material such as zinc alloy by adopting an electrostatic spinning technology, and the degradable zinc-based composite GBR membrane with the surface loaded with the nano electrostatic spinning fiber coating can inhibit excessive release of zinc ions, improve biocompatibility of the zinc alloy and the like, promote osteoblast differentiation and promote angiogenesis. The electrostatic spinning coating on the surface of the zinc-based composite GBR membrane serves as a physical barrier to block invasion of epithelial cells and fibrocytes, and angiogenesis is promoted along with degradation of fibers and slow release of drugs; the porous zinc alloy and the like in the middle layer not only provide mechanical support, but also release zinc ions in the degradation process to achieve multiple functions of resisting bacteria and promoting osteogenesis.

A preparation method for a food nanofiber film having sustained-release antibacterial activity, and a use thereof, belonging to the technical field of food packaging films. A metal-organic framework material MIL-101(Fe) is used to encapsulate natural plant essential oils, while polylactic acid and polycaprolactone are used as film-forming substrates, to prepare a food nanofiber film capable of exerting a long-term and efficient antibacterial effect; by means of encapsulating highly volatile natural plant essential oils with MIL-101(Fe), the residence time of antibacterial substances in the top space of the packaging film can be extended, increasing the utilization of the essential oils and achieving long-lasting antibacterial effects. Moreover, MIL-101(Fe) has a specific surface area of 2865 m2 / g, which can greatly improve the encapsulation rate and sustained-release effect of the plant essential oils. At the same time, the film, prepared by electrospinning, has a high specific surface area, which is conducive to increasing the encapsulation rate of the plant essential oils. This preparation method is safe, environmentally friendly, simple to operate, and easy to promote and apply.

The invention relates to the field of film engineering, in particular to a conductive film and a preparation method thereof. The preparation method comprises the following steps: dissolving a water-soluble high-molecular polymer in a solvent to obtain a polymer solution, dissolving a polyanion electrolyte in the polymer solution, and swelling to obtain a matrix; and obtaining a conductive solution containing the water-soluble conductive polymer, adding the conductive solution into the matrix, and stirring until the conductive solution is homogenized to obtain the spinning solution. And the content of each component in the spinning solution is moderate. And performing electrostatic spinning by using the spinning solution to form the conductive film on the receiver. The conductive thin film is prepared in an electrostatic spinning mode, and manufacturing of the large-area flexible conductive thin film with the micro-nano-scale thickness is achieved. The polyanion electrolyte is added into the spinning solution, so that the binding force between the electroactive component and the carrier polymer is greatly improved, a mechanical phase and an electrical phase form a bicontinuous phase separation state, a gel spinning precursor is formed and drafted into filaments from a needle tip, and a uniform gel-like conductive film is formed on the surface of the receiver.

The utility model relates to a receiving device for an electrostatic spinning machine, which belongs to the field of electrostatic spinning equipment, and comprises a cylindrical receiving roller, the circumferential surface of the receiving roller forms a receiving surface, the top end of the receiving surface is provided with a slot, a fixed plate is embedded in the slot, and the fixed plate comprises a first plate and a second plate which are attached front and back. The lower end of the first plate is bent backwards to form an abutting end, the upper surface of the abutting end is attached to the lower end of the second plate, and the rear end of the abutting end abuts against the inner side wall of the inserting groove. A flexible rubber layer is arranged on the front side of the first plate, a flexible rubber layer is arranged on the rear side of the second plate, and the flexible rubber layers on the first plate and the second plate are attached to the inner side wall of the inserting groove. According to the receiving device, the fixing process of a base material is completed through the slot structure on the inner side of the receiving roller, the surface of the receiving roller cannot be affected, the stability of the quality of an electrostatic spinning finished product can be effectively ensured, and the receiving device has the long service life.

The invention discloses a filter non-woven fabric. The filter non-woven fabric comprises a surface layer, a middle layer and a bottom layer which are sequentially stacked, wherein the surface layer is a fine filtering layer and is prepared by electrostatic spinning of nanofibers; the middle layer is arranged as a main filter layer and is prepared from high-efficiency electret melt-blown polypropylene; the bottom layer is a supporting layer and is made of spun-bonded polyester; the surface density is set to be 0.3-0.8 g / m, and the thickness is set to be 5-15 microns, so that a superfine limiting network is formed; the surface density of the middle layer is set to be 15-30 g / m, the thickness of the middle layer is set to be 0.3-0.6 mm, and an electret adopts fluoridation treatment and a corona electret; the surface density of the bottom layer is 20-40g / m, and the thickness of the bottom layer is 0.15-0.3 mm. According to the non-woven fabric for the filter, the nanofibers are directly deposited on the melt-blown layer through one-step online compounding, then the spun-bonded bottom layer is compounded through hot pressing, production steps are reduced, the interlayer binding force is enhanced, meanwhile, the nanofibers are only compounded on the surface layer of the filter material, and the cost can be greatly reduced.

The invention discloses a water treatment filtering material and a preparation method thereof, and relates to the technical field of water treatment. When the water treatment filtering material is prepared, alkaline lignin, epichlorohydrin and triethylenetetramine are subjected to a reaction through a reverse suspension cross-linking technology, and lignin porous microspheres are prepared; carrying out reaction on the lignin porous microspheres and picolinamide ligands to obtain modified lignin porous microspheres; 3-mercaptopropyltriethoxysilane and titanium dioxide are subjected to a reaction, and modified titanium dioxide is prepared; the preparation method comprises the following steps: reacting pyromellitic dianhydride, 1, 4-diaminobutylene and 4 ', 4-diaminodiphenyl ether to prepare functionalized polyamide; the functional polyamide, the modified lignin porous microspheres and the modified titanium dioxide are prepared into a spinning solution, and a polyamide membrane is prepared through electrostatic spinning; and carrying out liquid reaction on bromohexane on the polyamide membrane to obtain the water treatment filtering material. The prepared water treatment filtering material has excellent antibacterial property, heavy metal adsorption property, dye removal property and mechanical property.

The invention discloses lithium-free high-heat-resistance ceramic pug and a preparation method thereof, and relates to the technical field of ceramic materials. When the lithium-free high-heat-resistance ceramic pug is prepared, aluminum oxide reacts with 3-(2, 3-epoxypropoxy) propyltrimethoxysilane to prepare pre-modified aluminum oxide; reacting the pre-modified aluminum oxide with starch to obtain modified aluminum oxide; mixing ethyl acetoacetate, isopropanol, zirconium oxychloride, aluminum sec-butoxide, polyvinylpyrrolidone and N-N dimethylformamide to prepare a spinning solution, performing electrostatic spinning, and then immersing the spinning solution into the yttrium oxide sol to prepare aluminum oxide-zirconium oxide-yttrium oxide composite fibers; stirring and mixing the modified aluminum oxide, talc, aluminum oxide-zirconium oxide-yttrium oxide fibers, hydroxypropyl methyl cellulose, glycerol, oleic acid, polyethylene glycol and water, and performing vacuum pugging to obtain the lithium-free high-heat-resistance ceramic pug. The lithium-free high-heat-resistance ceramic pug prepared by the invention has good thermal shock resistance and bending strength after being sintered.

The application discloses a preparation method of superfine nanofiber antibacterial and mosquito-repellent high-efficiency low-resistance air filtration membrane, which comprises the following steps: dissolving cellulose acetate, cinnamyl aldehyde and polyhexamethylene biguanide hydrochloride in a solvent, fully stirring to form a spinning solution, wherein the solvent is a mixed solution of acetone, N, N-dimethylacetamide and water; and performing electrostatic spinning on the spinning solution to obtain the superfine nanofiber antibacterial and mosquito-repellent high-efficiency low-resistance air filtration membrane. The manufacturing steps of the application are simple and not complicated; cellulose acetate has excellent mechanical properties, hydrophobicity and thermal stability, and is an ideal material for air filtration membrane; the liquid property of cinnamyl aldehyde can effectively dilute cellulose acetate, so that the overall binding energy of the mixed solution system is reduced, the diameter of the prepared fiber is reduced, and meanwhile, the mild binding force of cinnamyl aldehyde minimally affects the interaction between cellulose acetate molecules.

This invention relates to the field of biomedical technology, specifically to a biomimetic piezoelectric scaffold for promoting bone repair, its preparation method, and its applications. The biomimetic piezoelectric scaffold provided by this invention is produced by electrospinning PLLA into oriented nanofibers, and then modifying the fiber surface with nano-hydroxyapatite. To enhance the adhesion of hydroxyapatite to the fiber surface, a polydopamine layer is modified between the two as a connecting layer, ultimately resulting in a biomimetic piezoelectric scaffold with high porosity, good osteointegration, and osteogenic promoting effects. This scaffold exhibits good bone regeneration promoting effects in in vitro MSC recruitment, osteogenic differentiation experiments, and repair of skull bone defects in rats.

This invention belongs to the field of gas sensor technology and discloses a method for preparing europium ferrite nanosensors and their applications. This method utilizes electrospinning technology combined with a specific low-temperature confined-domain calcination process (550℃~700℃) to prepare EuFeO3 nanotubes with a hollow structure and rough surface by taking advantage of the thermal decomposition kinetics differences of poly(p-v) magnets (PVP). This process effectively suppresses excessive repair of lattice oxygen while forming a unique tubular morphology, effectively "freezing" oxygen vacancies (O2) accounting for up to 34.44% on the material surface in situ. v This invention addresses the shortcomings of traditional solid fiber materials by constructing a sensor using a grinding, dispersion, and coating process. Utilizing the dual reactive surfaces of hollow nanotubes and high-concentration oxygen vacancy active sites, it achieves highly sensitive and selective detection of low-concentration ethylene gas released during fruit ripening. This invention solves the problems of small specific surface area and insufficient active sites in traditional solid fiber materials.

The application discloses a nanofiber diaphragm and a preparation method and application thereof. The diaphragm has a thickness of 80-200 mu m, comprises a diaphragm and an inorganic ceramic material coated on the surface of the diaphragm, and the diaphragm contains a porous organic cage. The good solution processability and compatibility of the porous organic cage with the polymer provide a strong condition for the dispersion of the porous organic cage in the polymer, promote the hybridization of the porous organic cage and the polymer at a molecular level, and obtain a porous organic cage hybrid nanofiber diaphragm. The electrospinning porous organic cage hybrid nanofiber diaphragm has high porosity, electrolyte absorption rate and hydrophilicity, can combine a large number of water molecules, is favorable for reducing corrosion of a zinc negative electrode in contact with an aqueous electrolyte, has extremely high mechanical strength, can induce uniform deposition of zinc ions, and inhibits growth of zinc dendrites; the inorganic ceramic coating prevents the diaphragm from being punctured, improves the electrochemical performance and cycle life of an aqueous zinc ion battery, and has great application potential in the field of diaphragms for aqueous zinc ion batteries.

The invention relates to the technical field of adsorption materials, in particular to a high-performance seaweed carbon fiber material based on microsphere phase change and a preparation method of the high-performance seaweed carbon fiber material. The method comprises the following steps: carrying out component separation on a seaweed raw material to construct a core-shell structure microsphere phase change unit which takes calcium alginate microspheres as a shell and seaweed active polysaccharide as a phase change medium, introducing sulfonic cellulose nanocrystals and polyacrylonitrile to be blended to prepare a composite spinning solution, dispersing the microsphere phase change unit into the composite spinning solution, and preparing the composite spinning solution. After electrostatic spinning, catalytic carbonization and water vapor activation, the seaweed carbon fiber material is finally prepared, a sulfonic acid group effectively catalyzes a polyacrylonitrile cyclization reaction in the carbonization process, the compactness of a carbon skeleton is remarkably enhanced, and the sulfonic acid group and a microsphere phase change unit generate a multi-stage synergistic enhancement effect, so that the material has ultrahigh strength and high adsorbability at the same time; the technical problem that the mechanical property and the adsorption property of the biomass carbon fiber are difficult to consider at the same time is solved.

The application discloses an asymmetric diaphragm, a preparation method and application thereof in lithium batteries, and belongs to the field of high polymer materials and electrochemistry. The asymmetric diaphragm comprises a positive electrode side material layer, a base film and a negative electrode side material layer in sequence; the base film comprises a polypropylene diaphragm or a polyethylene diaphragm; the positive electrode side material layer is composed of a positive electrode side material layer polymer and an inorganic lithium ion conductive active ceramic material; and the negative electrode side material layer is composed of a negative electrode side material layer polymer and an inorganic ceramic material. The asymmetric diaphragm prepared by the method of electrostatic spinning and electrostatic spraying can enhance the interface stability with lithium battery positive and negative electrodes, has good wettability to electrolyte, can enhance Li + transport kinetics and inhibit uncontrollable growth of lithium dendrites, thereby improving the rate performance and long cycle stability of the battery.

This invention relates to the field of carbon fiber composite materials technology, and discloses a carbon fiber bundle composite filament coated with nanofiber yarn, comprising carbon fiber bundles and nanofiber yarn, wherein the nanofiber yarn coats the outer surface of the carbon fiber bundles; the carbon fiber bundles are high-modulus carbon fiber bundles, and the nanofiber yarn is prepared from polymer materials by conjugated electrospinning. This invention utilizes conjugated electrospinning technology to introduce a dense and uniformly distributed layer of nanofiber yarn onto the surface of high-modulus carbon fiber bundles, obtaining a carbon fiber bundle composite filament coated with nanofiber yarn. This composite filament exhibits good wear resistance and toughness, and its processability is significantly improved.