445results about "Electro-spinning" patented technology

The invention relates to a device and a method for preparing nanofiber core-spun yarn through batch coaxial electrostatic spinning. The device comprises a needleless dish-shaped spray head, an air blowing auxiliary device, a liquid supply device, an annular twisting device, a high-pressure generator, a negative-pressure air suction device, a winding device and an unwinding device. The core yarn penetrates through the axis of the needleless dish-shaped nozzle, the nanofiber generated by the needleless dish-shaped nozzle coaxially wraps the surface of the core yarn through the whole spinning device, and batch preparation can be achieved. The device is further provided with an air blowing auxiliary device and a negative pressure air suction device, under the air blowing effect of an air blowing nozzle and the adsorption effect of a negative pressure air suction shell, airflow force can be generated to promote jet flow to be further stretched in a straightened mode, under the common influence of electric field force and the airflow force, the jet flow is fully stretched, bending is reduced, and the service life of the jet flow is prolonged. Therefore, the nanofiber bundles can continuously cover the surface of the core yarn in a high-orientation state under the traction of the annular twisting device, and the continuous nanofiber core-spun yarn is formed.

The invention belongs to the technical field of thermal protection materials, and provides a temperature sensing array based on fabric type flexibility, a preparation method and a spinning solvent. The preparation method comprises the following steps: S1, forming a polymer precursor through a spinning forming process to obtain an initial fiber; s2, performing twisting forming on the initial fibers to form twisted fibers; s3, the twisted fibers are subjected to curing treatment and pyrolysis treatment, and sensing yarn is obtained; s4, the sensing yarn is integrated on the flexible ceramic fiber cloth, and the flexible ceramic fiber cloth with the sensing array ceramic temperature-sensitive yarn is obtained; s5, performing laser local heating on the wire connection position of the sensing array to prepare a conductive electrode; and S6, selecting a wiring mode according to the conductivity and the target test temperature, and identifying a real-time temperature field according to the temperature resistance characteristic. Array integration of the woven thermal protection material can be realized through a weaving process.

The invention discloses a preparation method and equipment of three-chamber eccentric parallel structure nanofibers. The preparation method comprises the following steps: simultaneously carrying out high-voltage electrostatic spinning on three spinning solutions; the two spinning solutions are respectively divided into microfluids to be led out through an array formed by two sets of series metal capillary tubes; the other spinning solution is divided into microfluids to be led out through a plurality of bottom through holes of the insulating container; the first series of metal capillary tubes are inserted into the second series of metal capillary tubes to form a series of metal capillary eccentric sleeves; the series of metal capillary eccentric sleeves penetrate through the insulating container and extend out of one side of the interior of the bottom through hole to form a combined eccentric outlet of three strands of spinning solutions; three spinning solutions are guided into a high-voltage electrostatic field in an eccentric parallel mode through the combined eccentric outlet, and the three-chamber eccentric parallel structure nanofiber is formed through single-step direct stretching. According to the method, the capability of preparing the three-chamber eccentric parallel structure characteristic nanofiber with a complete structure in a single-step, batch and large-scale manner is endowed.

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.

An enhanced flash evaporation / electrospinning composite spinning equipment includes a flash spinning equipment, an electrospinning equipment, and a grounded receiving conveyor belt; the flash spinning equipment includes a flash spinning spinneret unit, the flash spinning spinneret unit includes a first spinneret, and the first spinneret is grounded; the electrospinning equipment includes a high-voltage power supply and an electrospinning spinneret unit, the electrospinning spinneret unit includes a second spinneret, and the second spinneret is connected to the high-voltage power supply; the first spinneret and the second spinneret are both located above the receiving conveyor belt at opposite positions with a distance of D, and the value range of D is 15-40 cm. The enhanced flash evaporation / electrospinning composite spinning equipment has a simple structure, and can prepare products that are not easy to delaminate, and excellent in waterproof performance and air permeability.

The application relates to a preparation method of a hollow fiber membrane composite thermal insulation material, which comprises the following steps: adding 18-22% of polyurethane, 4-8% of polyethylene glycol 2000 and 72-76% of N,N-dimethylacetamide into a spinning reaction kettle to mix, stir and defoam to prepare homogeneous casting solution; based on a non-solvent induced phase separation method, the homogeneous casting solution is coated on the surface of a polyester braided tube through a spinneret by adopting a concentric circle composite spinning technology, is gathered on a spinning wheel after a coagulation bath to form a reinforced polyurethane hollow fiber membrane assembly which is arranged in parallel and obliquely crosses and is mutually bonded, and the fiber membrane assembly is hot-pressed to prepare the hollow fiber membrane composite thermal insulation material under the conditions of a temperature of 60-150 DEG C and a pressure of 120-470 MPa. Since the coating layer and the braided tube are both through porous structures, the prepared composite material has good air permeability.

The invention discloses a degradable nanocellulose sustained-release drug-loaded film and a preparation method thereof, and belongs to the technical field of drug functional materials. The preparation method comprises the following steps: mixing and stirring microcrystalline cellulose and 64wt% sulfuric acid solution, centrifuging, dialyzing to be neutral, and freeze-drying to obtain CNCs; cNCs, NaIO4 and water are mixed and then subjected to a light-shielding reaction, ethanol precipitation is added, dialysis purification is conducted, freeze drying is conducted, and formylation modified CNCs are obtained; mixing and stirring the aldehyde modified CNCs, sericin, polyvinyl alcohol, water and a target drug to obtain a core layer solution; dissolving a polylactic acid-glycolic acid copolymer into a mixed solution of chloroform and DMF (Dimethyl Formamide) to obtain a shell solution; the core layer solution and the shell layer solution are subjected to coaxial electrostatic spinning forming to obtain the drug-loaded fiber, then the drug-loaded fiber is subjected to biomimetic mineralization surface modification to obtain the degradable nanocellulose sustained-release drug-loaded film, the drug loading rate is increased, the mechanical property of the drug-loaded film is improved, and the sustained-release and release-controllable effects are achieved.

This invention provides an in-situ polymerized yarn and its preparation method, relating to the field of yarn textile technology. The preparation method of this in-situ polymerized yarn includes the following steps: S1. Mixing a polymer, solvent colorant, and complexing agent in a specific ratio to obtain a spinning solution; S2. Simultaneously performing electrospinning, carding, and embedding to obtain a colored nanofiber / cotton composite sliver; S3. Drawing and spinning the sliver to produce yarn. By using colored nanofibers composited with a cotton web, the finishing process is eliminated to reduce contamination. The selection of polydimethyldiallyl ammonium chloride as a complexing agent in the spinning solution increases the volume occupied by the cross-linked structure formed by the complexing agent and dye, enhancing the cohesion with the polymer and improving its color fastness.

The invention discloses a TPU film for robot electronic skin and a preparation method of the TPU film, and relates to the technical field of flexible electronic materials, the film takes TPU introduced with Diels-Alder dynamic reversible bonds as a matrix, a conductive filler is formed by dopamine-modified silver nanowires and MXene, the concentration of the conductive filler is in continuous or quasi-continuous gradient decrease, and the conductive filler is a conductive filler formed by silver nanowires and MXene. An integrated network with self-repairing and environmental stability is formed and is used as an electrode; phase change microcapsules and triboelectric nanofibers are compounded in a low-conductivity contact area to form an intelligent response layer which is self-adaptive in sensing threshold and capable of generating power by friction. Through one-step multi-nozzle electrostatic spinning forming, the problem that self-repairing, signal stability, environmental adaptability and energy independence in electronic skin are difficult to consider at the same time is solved.

The invention provides a multi-stage synergistic wound repair nanofiber membrane and a preparation method thereof. The composite fiber membrane sequentially comprises an electrostatic spinning pullulan / tannic acid / tranexamic acid nanofiber membrane for promoting the formation of blood clots, a polydopamine / calcium chloride modified electrostatic spinning cellulose acetate membrane with coagulating, antibacterial and repairing effects, and a chitosan composite cellulose non-woven fabric, and the electrostatic spinning pullulan / tannic acid / tranexamic acid nanofiber membrane is a wound surface contact layer. The nanofiber membrane has the functions of a physical hemostasis barrier and continuously releasing regeneration promoting biological signals, and a dynamic hemostasis healing process is formed.

The invention relates to the technical field of biological scaffolds, in particular to a silk fibroin-based biological 3D intelligent response scaffold and a preparation method and application thereof.The silk fibroin-based biological 3D intelligent response scaffold adopts a three-layer bionic gradient structure of an oriented fiber membrane, a porous sponge layer and an interface layer, simulates natural tissues, and has the advantages that the bionic gradient structure is improved; mechanical guidance, cell inhabitation and biological activity interfaces are provided respectively, and high-quality regeneration of blood vessels, nerves and skin is promoted synergistically. According to the present invention, the pH / enzyme / temperature triple response unit is provided, such that the lesion microenvironment can be perceived, the targeted release can be triggered, the problem of high burst release rate of the traditional physical drug loading can be solved, and the on-demand accurate drug delivery can be achieved. The SF / HPMC gel is adopted for 3D printing, the printing precision is high, and the porosity difference is 1t; the product performance is stable, and the pore structure can be precisely designed and customized according to the regeneration requirements of different tissues (such as blood vessels, nerves and skin).

The invention discloses a single-layer Janus fiber membrane with pore and wettability double gradients and a one-step electrospinning preparation method of the single-layer Janus fiber membrane, and belongs to the technical field of electrostatic spinning functional fiber materials. According to the method disclosed by the invention, polyacrylonitrile (PAN) has weak hydrophilicity, and hydrophobic modification and hydrophilic modification of the PAN fiber membrane can be realized by respectively adding fluorinated titanium dioxide (F-TiO2) particles and tannic acid (TA); gradient regulation and control of pores are realized by regulating and controlling the concentration of the PAN spinning solution. The method comprises the following steps: S1, mixing F-TiO2 particles with PAN to obtain a spinning solution A; s2, mixing TA and PAN to obtain a spinning solution B; s3, the spinning solution A and the spinning solution B are sequentially sucked into the same injector, and a pre-spinning solution C is obtained; and S4, preparing the single-layer fiber membrane through electrostatic spinning. The fiber membrane has a pore / wettability double-gradient structure, shows excellent one-way moisture conduction performance, and has wide application prospects in the fields of personal protection masks, outdoor sportswear and the like.

Nanofibrous materials and their fabrication by electrospinning are disclosed for passive temperature control on earth and in outer space. The materials combine high solar reflectivity with high thermal emittance in the infrared region, including in the long wavelength atmospheric window region between 8 μm and 13 μm. The materials include nanofibrous PTFE / PEO and silica materials. The physical properties of the materials are suitable for extraterrestrial as well as terrestrial applications.

The application discloses a preparation method of a biomass-based air purification membrane and belongs to the technical field of air purification membrane preparation. The method comprises the following steps: step one, a spinnable polymer material is placed in a solvent and heated and stirred until the polymer material is dissolved, and then a solution of biomass material is added after cooling, and the solution is uniformly mixed to obtain a spinning precursor solution; step two, a drum is used as a receiving device, and electrostatic air-jet spinning is performed on the spinning precursor solution to obtain an electrostatic air-jet spun fiber membrane; and step three, an array template method is used to patternize and press the electrostatic air-jet spun fiber membrane by using a flat vulcanizing machine, so that the electrostatic air-jet spun fiber membrane has a periodic micro-pattern structure, and the air purification membrane is obtained. The application prepares an air purification membrane with a blocking effect on ultraviolet rays, and the air purification membrane has high filtration efficiency and small pressure drop, and has a good application prospect in the field of air purification.

The application provides an absorbable vascular stent covering facilitating endothelialization and a preparation method thereof, and belongs to the technical fields of biomedical materials and vascular stent covering preparation. The absorbable vascular stent covering facilitating endothelialization is prepared based on modified silk fibroin and domestic silkworm silk. The inner surface of the absorbable vascular stent covering facilitating endothelialization has a nano topological structure and a matrix-like component simulating a vascular basement membrane, and the outer surface has a micro topological structure. The absorbable vascular stent covering facilitating endothelialization has good mechanical properties and excellent endothelial cell activity, and can be used for producing a vascular stent capable of rapidly forming a new endothelial layer, maintaining stable blood flow, and inhibiting thrombosis and inflammation.

Mechanically and piezoelectrically anisotropic polymer fibers may be formed by spinning a polymer solution or gel that includes a high molecular weight crystallizable polymer and a liquid solvent. The solvent may be configured to interact with the polymer to facilitate chain alignment and, in some examples, create a higher crystalline content within the spun fibers. The polymer solution may also include a low molecular weight additive. The high and low molecular weight polymers may each be characterized by a bimodal molecular weight distribution where the molecular weight of the additive is less than the molecular weight of the crystallizable polymer. The polymer(s) and the additive(s) may be independently selected from vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, hexafluoropropene, vinyl fluoride, etc. The spun fibers may be oriented, annealed, poled, and woven or laminated to form a polymer thin film having a high elastic modulus and a high electromechanical coupling factor.

An optimized process for the preparation of a spinning solution for the production of acrylic fiber precursors (PAN) of carbon fibers and an optimized process for the production of carbon fibers from said acrylic precursor (PAN), are described.

The present application relates to a kind of carbon fiber composite material nondestructive testing methods based on piezoresistive nanofiber sensor, it includes the following steps: 1), preparation spinning solution;2), build electrospinning platform;3), preparation high frequency response piezoresistive nanofiber sensor;4), high frequency response piezoresistive nanofiber sensor is embedded in carbon fiber composite material board;5), to the carbon fiber composite material board vibration response test and ultrasonic guided wave test, to detect the damage condition of carbon fiber composite material board.The present application can guarantee that fiber sensor is embedded in carbon fiber composite material board, can guarantee that the nondestructive testing of carbon fiber composite material is realized under the premise of not affecting the mechanical properties of carbon fiber reinforced composite and not occupying carbon fiber composite material surface space.

This invention discloses a photothermal responsive multifunctional composite coating, its preparation method, and its application, relating to the field of antibacterial nanomaterials technology. The composite coating comprises an electrophoretic deposition onto a substrate using an electrophoretic solution formulated with chitosan and electrospun short fibers. The electrospun short fibers are prepared by electrospinning a spinning solution formulated with polylactic acid and a core-shell composite material, followed by plasma treatment and fluffing. The core-shell composite material is a composite material with a silver nanorod core and a mesoporous silica shell; wherein the silver nanorods encapsulate gold bipyramidal seeds. The core-shell structured silver nanoparticle antibacterial agent provided by this invention significantly alleviates the problems of cytotoxicity of silver nanoparticles and limited functionality as a surface modification material for bone implants.

One embodiment of the present invention relates to a functional fiber including functional particles and a method for manufacturing same, wherein the functional fiber includes a porous polymer fiber and functional particles distributed at least in the porous polymer fiber, the functional particles are contained in an amount of 0.05 wt% to 5 wt% on the basis of the total weight of the functional fiber, and the functional particles are exposed to the outside from the surface of the porous polymer fiber. The functional fiber has pores formed on the surface thereof so as to position antibacterial and antiviral materials present inside the fiber toward the surface of the fiber, resulting in improved antibacterial and antiviral efficiency, and the method for manufacturing the functional fiber can easily adjust porosity on the surface of the functional fiber through humidity control.

The application discloses a SiON micro-nano fiber membrane with electromagnetic wave transmission and high-temperature heat insulation, and a preparation method and application thereof, and relates to the technical field of ceramic fibers.The fiber membrane is formed by overlapping SiON micro-nano fibers; the arrangement mode of the SiON micro-nano fibers in the fiber membrane is disordered or directional; the diameter of the SiON micro-nano fibers is 100 nm to 1.3 mu m; the content of Si element in the SiON micro-nano fibers is greater than 35 at.%, the content of O element is greater than 30 at.%, the content of N element is greater than 12 at.%, and the content of C element is less than 7 at.%. The SiON fiber membrane prepared by the application has the component / structure characteristics of micro-nano fiber diameter (100-1200 nm), low carbon and amorphous, and exhibits the characteristics of light weight, porosity, wave transmission, heat insulation, high-temperature stability and the like, and is a novel wave transmission and heat insulation integrated fiber material with wide application prospect.

A method for forming an ultra-high temperature (UHT) composite structure includes dispensing a first polymeric precursor (20) with a spinneret (12); forming a first plurality of nanofibers (26) from the first polymeric precursor (20); depositing the first plurality of nanofibers (26) with a collector (16); and applying a fluid (40), with a nozzle (36), onto the first plurality of nanofibers (26) disposed on the collector (16). The fluid includes a second polymeric precursor (42).

The invention discloses borate rare earth-based high-entropy ceramic nanofibers and a preparation method thereof, and relates to the technical field of high-entropy ceramics, and the preparation method comprises the following steps: sequentially adding a spinning aid, rare earth salt and boric acid into a solvent, and uniformly stirring to obtain a spinning solution; performing electrostatic spinning and pre-oxidation on the spinning solution to obtain a pre-oxidized precursor fiber; and placing the pre-oxidized precursor fiber in inert gas, calcining at high temperature, and cooling to obtain the borate rare earth-based high-entropy ceramic nanofiber.

This invention belongs to the field of cooling fiber membrane technology, and particularly relates to a coaxial electrospun radiation phase change cooling fiber membrane and its preparation method. The shell spinning solution is prepared by adding poly(vinylidene fluoride-co-hexafluoropropylene) to a mixed solvent of N,N-dimethylformamide and acetone, heating and stirring at 45-60°C for 6 hours to obtain a homogeneous solution, and then allowing the homogeneous solution to stand at room temperature for 6 hours to eliminate bubbles. The core spinning solution is prepared by adding n-octadecane to chloroform, stirring for 30 minutes, and then storing at 35°C. Electrospinning is performed using an electrospinning device and a 22G / 17G coaxial needle. The shell and core spinning solutions are transferred to syringes and connected to the corresponding parts of the coaxial needle. Electrospinning parameters are adjusted to perform electrospinning, resulting in a coaxial electrospun radiation phase change cooling fiber membrane with a wrinkled structure. The weight-average molecular weight (Mw) of the poly(vinylidene fluoride-co-hexafluoropropylene) is 455,000, and the number-average molecular weight (Mn) is 110,000.

The invention relates to the technical field of biomedical engineering, in particular to an implantable neural electrode capable of performing dual-mode detection of electrode electrophysiology and electrochemical signals, carbon fibers are used as a skeleton, and the surfaces of the carbon fibers are modified with an insulating layer and a modified gel layer with biocompatibility. According to the invention, the carbon fiber is used as a skeleton, and the surface of the carbon fiber is modified with the insulating layer and the modified gel layer with biocompatibility, so that the excellent mechanical properties and electrochemical properties of the carbon fiber are retained, and meanwhile, the direct contact between a rigid material and tissues is avoided; the modified gel layer has good biocompatibility and conductivity, the biocompatibility of the contact surface of the electrode and the tissue can be effectively improved, the inflammatory reaction caused by electrode implantation and the mechanical mismatch between the electrode and the tissue are reduced, and the long-term stable effect is achieved.

The application provides a preparation method of a high-sensitivity nanofiber composite bamboo-joint core-spun yarn strain sensor and belongs to the field of wearable flexible sensors. The method comprises the following steps: S1, polyurethane is dissolved in a solvent to prepare a spinning solution, nanofiber / drawing filament composite yarn is prepared through an electric auxiliary core spinning technology, and a stretching device is used to impart deformation to the drawing filament; S2, the composite yarn in the above deformation state is placed in a conductive nanoparticle / polymer dilute solution for immersion; S3, the immersed composite yarn is immersed in water, and a nanoparticle / polymer conductive layer is constructed on the surface of the composite yarn through non-solvent induced phase separation; and S4, the stretching device is removed, and the composite yarn is subjected to heat treatment to obtain a nanofiber composite bamboo-joint core-spun yarn sensor. The sensor has a radial core-shell structure and an axial concave-convex structure, is high in sensitivity, has a stress detection limit as low as 0.01 N, and simultaneously has excellent mechanical properties.

The invention discloses a combined spinning head combining side-by-side capillary tubes with a confined liquid level, electrostatic spinning equipment and a batch preparation method of three-chamber embedded parallel structure nanofibers. The side-by-side capillary tube combined confinement liquid level spinning head comprises a plurality of groups of metal capillary tube combinations and a metal hollow wedge, wherein every two metal capillary tube combinations are closely adjacent and side-by-side; any group of metal capillary tube combination comprises two sets of metal capillary tubes; all the metal capillary tubes penetrate through the metal hollow wedge in a pairwise parallel manner, are separated upwards at the upper part of the wedge body and then are converged into two sets of metal capillary tube combinations again to guide two different fluids; a liquid inlet is formed in the upper wide part of the metal hollow wedge, and an opening is formed in the lower narrow part; and the outlet end of the metal capillary tube combination is close to one wedge edge and extends out of the bottom surface of the lower narrow part of the metal hollow wedge by 0.8-1.2 mm. According to the method, outlets of a plurality of complex combined nozzles are used as macroscopic templates, and under the high-voltage electrostatic field, batch preparation of the three-chamber embedded parallel structure nanofibers is achieved through interaction of the high-voltage electrostatic field and fluid.

The invention discloses an electrostatic spinning coated protective diaphragm, which comprises a polytetrafluoroethylene base membrane and a bactericidal electrostatic spinning layer, the bactericidal electrostatic spinning layer is composed of polybenzimidazole, polyacrylic acid and a metal salt, and is obtained by electrostatic spinning and cross-linking agent treatment, the molar ratio of polybenzimidazole to polyacrylic acid is 1: 1, and the molar ratio of polybenzimidazole to polyacrylic acid is 1: 1. The aperture is gradually increased from the side, attached to the polytetrafluoroethylene base membrane, of the sterilization electrostatic spinning layer to the other side of the sterilization electrostatic spinning layer. The invention further discloses a preparation method of the electrostatic spinning coating protective diaphragm, the polyion liquid and the electrostatic spinning method are combined, and the preparation method is simple and easy to implement. The prepared electrostatic spinning fiber is used as an inner layer of a protective garment, can resist bacteria, inhibit bacterial organisms and prevent external foreign matters and bacteria from invading a human body, and has good killing and inhibiting effects on the bacteria and the bacterial organisms, and the diaphragm has a porous structure and aperture gradient and has good air permeability.

The invention relates to a preparation method of an antistatic array spinning composite yarn, which comprises the following steps of: performing array ionization on a spinning solution, and performing subsequent spinning by taking a web as a receiving matrix to obtain the composite yarn. The prepared yarn has good and efficient antistatic performance, the preparation mode is simple, and large-scale preparation of the antistatic wool yarn can be achieved.

A method of producing a linear fibrous structure in an alternating electric field by spinning of a polymer solution or polymer melt on a spinning electrode, in which nanofibers are formed from the polymer solution or melt in a spinning area created on the spinning electrode and are carried away from it by the action of the electric wind. In the spinning area, a narrow flat linear structure of polymer solution is formed with a finite length. The spinning area is open in the spinning direction and in the central part thereof. The nanofibers are formed and move away from the spinning area in a flat structure in which they gradually lose their kinetic energy. In a place with zero kinetic energy, nanofibers form a linear virtual collector in which nanofibers are formed into a ribbon of nanofibers.