109 results about "Electro spinning" patented technology

The invention discloses a three-fluid three-dimensional flow guide spinning head, electrostatic spinning equipment and a batch preparation method of three-chamber embedded parallel structure nanofibers, three different fluids are synchronously guided into a high-voltage electrostatic field by simultaneously arranging a plurality of nozzle outlets with combined structures, and a plurality of complex combined nozzle outlets are used as macroscopic templates, so that the three-chamber embedded parallel structure nanofibers are prepared under the high-voltage electrostatic field. Through interaction of a high-voltage electrostatic field and fluids, batch preparation of the three-chamber embedded and column-structured nanofibers by multi-fluid common electrospinning is realized. The three spinning solutions are guided to a common outlet through the first series of metal capillary tubes, the second series of metal capillary tubes and the spinning solution insulating container respectively; the first series of metal capillary tubes and the second series of metal capillary tubes are respectively dispersed from respective capillary tube gathering inlets, penetrate through the interior of the spinning solution insulating container to the bottom of the spinning solution insulating container and vertically penetrate out to form a plurality of outlets which are parallel in pairs; a through hole outlet is formed in any parallel outlet at the bottom of the spinning solution insulating container to form a common outlet of the three spinning solutions, and the three-chamber embedded and arrayed nano structure is directly prepared in batches in a single step.

This invention discloses a multifunctional composite flexible fabric with multiple functions including radiative cooling, energy harvesting, hydrophobicity, and antibacterial properties. The composite flexible fabric consists of several electrospun fiber layers, each formed sequentially by electrospinning in a top-to-bottom order. It includes at least two polymer electrospun fiber layers and at least one nanofunctional electrospun fiber layer, wherein the nanofunctional electrospun fiber layer serves as an intermediate sandwich layer, forming a sandwich structure with the polymer electrospun fiber layers located on the upper and lower surfaces. This invention also discloses a method for preparing this flexible fabric, using electrospinning to prepare it by electrospinning a PVDF or related polymer solution and a polymer solution modified with functional nanoparticles. This preparation method can effectively control the morphology of the nanofibers and the functions of the nanoparticles, enabling a synergistic effect between the functional nano-scattering particles and the nanofibers, resulting in an integrated functional fabric with thermal management, energy harvesting, and antibacterial properties.

The invention discloses a preparation method and application of an electrospun nanofiber membrane-based flexible SERS (Surface Enhanced Raman Scattering) substrate, and belongs to the field of preparation of SERS substrates. The preparation method comprises the following steps: firstly, preparing a polymer nanofiber membrane by adopting an electrostatic spinning method, and then depositing noble metal nanoparticles on the surface of the electrospinning polymer nanofiber membrane by adopting a magnetron sputtering technology, so as to obtain the noble metal nanoparticle and polymer nanofiber membrane flexible SERS (Surface Enhanced Raman Scattering) substrate. According to the present invention, the problems that the SERS substrate cannot be accurately controlled and cannot be continuously produced are solved, the preparation method has advantages of simpleness, high efficiency, no pollution, low cost and large-scale manufacturing compared with the existing preparation method, the substrate has characteristics of large specific surface area, high density hot spot distribution, good stability and adjustable size structure, and the trace detection of the pesticide residue on the irregular surface can be achieved.

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.

The invention provides a laser-electric coupling Taylor cone bionic electrospinning process method, a folded conductive metamaterial and application, the preparation method comprises the following steps: dissolving a carbon nanotube in N, N-dimethylformamide, stirring and carrying out ultrasonic treatment, then adding polymer powder, and continuously stirring to obtain a precursor solution; in the first stage, electrostatic spinning is carried out, meanwhile, a laser beam with the wavelength of 589-650 nm is focused on a rotating Taylor cone for electrostatic spinning, the treated spinning film is heated in air, heat preservation is carried out, then the temperature is reduced to the room temperature, and in the first stage, heating is carried out firstly, and then heat preservation is carried out; then raising the temperature in the second stage, keeping the temperature, and finally cooling to room temperature; in the coupled field spinning process, the synergistic effect of arrangement of the carbon nanotubes and the carbon nanofibers induced by photo-thermal response, local fluidity enhancement and an electric field jointly promotes axial dispersion and slidable in the fibers and formation of a self-adaptive network; and the folded conductive metamaterial capable of being folded for 10 million times is successfully prepared.

The present invention relates to a non-woven filter media (100, 200) comprising: - a first melt-blown layer (102, 202) comprising fibers made from a polymer material, wherein the polymer material comprises a thermoplastic resin and at least one of a charge adjuvant and a nucleating agent; - a second layer (104, 204); and - a third layer (106, 206) arranged between the first layer and the second layer, the third layer being made of electrospun nanofibers. The present invention also relates to a filter element comprising this filter media and to a bag filter for a heating, ventilation and air conditioning system, where the bag filter comprises the filter media or the filter element.

Thermally stable absorbable fiber populations, i.e. fiber populations that do not undergo thermally induced crystallization, can be intermixed to yield a stabilizing effect without altering morphological properties of a first fiber system. By addition of a stabilizing fiber population one may minimize thermally induced shrinkage and maintain physical properties of electrospun materials in the as-formed state. In one particular abstract, medical barrier materials may be formed from the electrospun materials to provide improved medical barriers for treatments.

The application belongs to the field of functional material preparation, and particularly relates to a preparation method of a super-light high-nucleic-acid-absorption electrospun fiber sponge material and application thereof. The SiO2 electrospun fiber is used as a framework, a three-dimensional monolithic structure assembled by fragmented electrospun nanofiber membranes is used, the interconnected nanofiber cell structures of which endow the three-dimensional monolithic structure with high porosity and excellent structural flexibility and stability. Meanwhile, the amino-rich polyethylene imine and chitosan are chemically crosslinked by using epichlorohydrin as a crosslinking agent, and finally during freeze-drying, the ice crystals are partially sublimated, leaving a pore structure, and a porous sponge material is obtained. The material has a high nucleic acid adsorption capacity, and makes nucleic acid extraction more simple, rapid and sensitive.

A fibrous composite material comprising a first electrospun polymer fibre population; and a second electrospun polymer fibre population dispersed within at least part of the first electrospun polymer

The pneumatic liquid supply system comprises a gas supply unit, the gas supply unit comprises a gas storage tank and a compressed gas generator connected to one end of the gas storage tank, and the gas supply unit is used for providing a stable gas source; the liquid storage unit comprises at least one liquid storage tank, and a pressure release valve is arranged at the top of the liquid storage tank; the liquid supply unit comprises a pneumatic control liquid supply switch valve and a flow control valve, and one end of the pneumatic control liquid supply switch valve and one end of the flow control valve are connected to a liquid outlet in the top of the liquid storage tank; the pneumatic control unit comprises a filtering pressure reducing valve and a plurality of control hand valves, one end of the filtering pressure reducing valve is connected with the gas storage tank, the other end of the filtering pressure reducing valve is connected with the control hand valves, and the control hand valves respectively control generation of positive pressure and negative pressure and start and stop of liquid supply; the spinning unit comprises a spinning needle plate with array needles, and the spinning needle plate is connected to the liquid supply unit; the positive pressure state and the negative pressure state in pneumatic liquid supply are accurately controlled through the pneumatic control unit, the stability and safety of the system are ensured, the liquid supply rate in the spinning process is accurately regulated and controlled through the flow control valve, and the spinning quality is improved.

The invention belongs to the technical field of materials and electrochemistry, and particularly relates to a preparation method based on a nonmetal monatomic catalyst, which comprises the following steps: S1, preparing an electrostatic spinning precursor solution by adopting a solvent method; and S2, preparing a conductive carbon nanofiber skeleton by adopting an electrostatic spinning process: carrying out electrostatic spinning on the electrospinning precursor solution in the step S1 at normal temperature, and carrying out pre-oxidation and high-temperature carbonization to obtain the carbon nanofiber loaded non-metal iodine monatomic. The carbon nanofibers in the material have excellent conductivity and a continuous three-dimensional network structure, and an efficient channel is provided for uniform loading of sulfur and rapid conduction of electrons. And meanwhile, the rich pore structure can effectively accommodate molten and infiltrated sulfur, and the diffusion of polysulfide in the electrolyte is inhibited by utilizing a physical confinement effect, so that the shuttle effect is relieved fundamentally, and the integrity in long-cycle operation is ensured. The iodine monatomic active sites enhance the chemical adsorption capacity to polysulfide, so that the capacity fading caused by migration of the iodine monatomic active sites is avoided.

The application relates to a device for promoting deep embedding of nanofibers and a use method thereof, which comprises an electrospinning device, a negative pressure air suction device, a fiber web transmission device, a fiber web charge management device and a fiber web lofting control device. The embedding channel of the electrospinning nanofibers in the fiber web is regulated through the fiber web lofting control device, and the residual charge on the screen is neutralized through the fiber web charge management device. The combined use of the devices can induce deep embedding of the electrospinning nanofibers in the thickness direction of the fiber web and effective combination between the fibers in the cross-scale, the function durability and stability of the obtained blended yarn are significantly improved, the industrial production of the cross-scale blended yarn is promoted, and the comprehensive performance of the functional textile is more effectively improved.

An electrospinning system, method, and apparatus comprises a dual polarity high voltage power supply with much less power out for safe operation, a solution dispensing assembly held at high positive potential by the dual polarity power supply, a Corona discharge assembly held at high negative potential by the dual polarity power supply, and a drum collector held at ground potential wherein a solution is drawn from the solution dispensing assembly to the drum collector thereby forming a fiber mat.

This invention provides a medical repair membrane with an orthogonal crack-limiting structure and its preparation method. This invention relates to the field of biomedical materials technology. The medical repair membrane of this invention comprises at least two electrospun fiber layers, which intersect to form an orthogonal fiber structure. Layer B, facing tissue integration, adopts a coaxial core-shell structure. The shell layer contains biodegradable polymers and bioactive components, while the core layer is a biodegradable polymer. The structure of this invention effectively inhibits crack propagation and improves the structural stability of the material. Simultaneously, the core-shell structure enables controlled release of active components and tissue-selective induction, balancing mechanical properties and biocompatibility. The medical repair membrane is suitable for soft tissue defect repair, such as dura mater repair, fascia repair, pericardial repair, and hernia repair.

According to the high-waterproofness fiber membrane and the preparation method thereof, the hydrophobic component is uniformly dispersed in the hydrophobic polymer solution, then the fiber membrane is prepared in an electrostatic spinning mode, and the hydrophobic component can be attached to the surface of the fiber, so that the fiber has super-hydrophobicity. By adopting the preparation method, the in-situ efficient electrospun fiber membrane can be obtained, the hydrophobic polymer and the hydrophobic component are dual-hydrophobic, the waterproofness is greatly improved, the fiber membrane has the function of a physical barrier due to high porosity and high air permeability, the fiber membrane is antifouling and waterproof, and the super-hydrophobic fiber membrane is soft and ultrathin and can be used as a super-hydrophobic membrane. And a certain bacterium isolation capability is achieved. The preparation method can be customized as required, and is high in safety, convenient and fast.

This invention relates to a triboelectric nanogenerator and its preparation method, belonging to the technical field of triboelectric nanogenerators. The preparation method includes the following steps: S1, dispersing styrene-ethylene-butene-styrene block copolymer, polyvinylidene fluoride, and MXene nanomaterials in a mixed solvent to obtain a negative friction layer spinning solution; S2, using dynamic pattern-induced multi-material nanofiber electrospinning technology, forming a negative friction layer from the negative friction layer spinning solution; S3, dispersing thermoplastic starch, sodium carboxymethyl cellulose, plasticizer, bis(2-hydroxyethyl) disulfide, and dithiothreitol in water to obtain a positive friction layer film-forming solution; S4, forming a positive friction layer from the positive friction layer film-forming solution; S5, bonding the micro-nano structures of the positive and negative friction layers face-to-face to obtain the triboelectric nanogenerator. This generator combines high output, long lifespan, and flexibility, and can be adapted to diverse scenarios such as wearable electronics, industrial high-temperature sensing, and environmental mechanical energy harvesting.

The present invention refers to an electrospun article comprising or consisting of fibers which comprise at least one collagen-like protein, at least one carrier and at least one crosslinker. In addition, the present invention refers to a method for obtaining an electrospun article, preferably according to the invention, comprising or consisting of the following steps a) providing at least one collagen-like protein in at least one solvent to obtain a solution of the at least one collagen-like protein, b) adding at least one carrier to the solution of the at least one collagen-like protein to obtain a solution of the at least one collagen-like protein and the at least one carrier, c) providing at least one crosslinker in at least one solvent to obtain a solution of the at least one crosslinker, d) pumping the solution of the at least one collagen-like protein and the at least one carrier in the inner needle of a coaxial nozzle, e) pumping the solution of the at least one crosslinker in the outer needle of a coaxial nozzle, f) electrospinning the solution of the at least one collagen-like protein and the at least one carrier and the solution of the at least one crosslinker to obtain the electrospun article, g) optionally drying the electrospun article obtained in step f). Furthermore, the present invention refers to an article obtainable by the method of the present invention, wherein the article is a medical device. Additionally, the present invention refers to the use of the article according to the present invention for wound healing and cell culture applications.

The invention discloses an ibuprofen transdermal patch based on core-shell structure viscous electrostatic spinning fibers and a preparation method of the ibuprofen transdermal patch, and belongs to the technical field of external transdermal patches. A viscous fiber membrane constructed based on core-shell structure electrospun fibers is used as a functional layer; a shell layer of the fibers is formed by curing a spinning solution formed by dissolving a thermoplastic elastomer and natural resin in an organic solvent B, and provides stable viscosity; the core layer is formed by curing a spinning solution formed by dissolving ibuprofen, a hydrophobic polymer and a penetration enhancer in an organic solvent A, and efficient loading and controllable release of drugs are achieved. By optimizing the shell-core flow rate ratio, spinning voltage and other key process parameters, the patch has the characteristics of strong adhesion in the initial stage and easy stripping in the later stage, and meanwhile, it is ensured that the transdermal permeation amount and release rate of the medicine meet the treatment requirements. The patch has the characteristics of high porosity and biphasic drug release which takes effect quickly in the initial stage and is maintained slowly in the subsequent stage, effectively avoids the first-pass effect and the skin irritation risk, and is particularly suitable for local treatment of inflammatory diseases such as acute gouty arthritis and the like.

The application belongs to the technical field of hydraulic pressure filtration, and provides a fiber composite hydraulic pressure defoaming filter element and a preparation method thereof.The application adopts a three-layer gradient precision filtration membrane design, and comprises an L1 bubble trapping layer of polyvinylidene fluoride nanofiber and metal fiber co-structure, an L2 synergistic coalescence layer of glass fiber framework and PA66 microfiber composite, and a L3 stable flow particle trapping layer of melt-blown polypropylene, combines a grid-shaped bubble breaking cover and an annular gap structure to form a gas discharge channel, prepares the composite fiber through electrospinning, orientation, annealing process regulation of beta phase content and in-situ polymerization technology, realizes a bubble removal rate of more than 91%, a pressure drop of less than 0.2 MPa, and a service life of more than 5000 hours, solves the technical problems of low defoaming efficiency and large flow resistance of the traditional filter element, and has wide industrial application value.

The application discloses an antibacterial hemostatic composite material and a preparation method thereof. The application adopts polylactic acid glycolic acid which is degradable and has good compatibility, and grafts hydrophilic N-vinyl-2-pyrrolidone, simultaneously utilizes radiation polymerization to form polypyrrolidone, and reacts with iodine to form high polyiodine with strong antibacterial property, and uses the same as an electrospinning base material and combines with notoginseng element, so that the positively charged amino groups on the notoginseng element and the negatively charged high polyiodine ions form a stable structure, the electrospinning solvent phase separation of the base material is regulated, a porous rapid hemostatic fiber material with uniform notoginseng element distribution and high loading capacity is formed, and the material is endowed with antibacterial property, good biocompatibility and notoginseng element stable release performance.

This invention discloses a UV-crosslinked regenerated silk fibroin hydrogel fiber, its preparation method, and its applications. Using silk fibroin as the main raw material, the silk fibroin is first regenerated to obtain regenerated silk fibroin. Then, the regenerated silk fibroin fibers are collected using electrospinning and a rotating collection roller. These fibers are then soaked in a solution containing a photoinitiator and placed under UV light for crosslinking to form regenerated silk fibroin hydrogel fibers. Finally, the fibers are washed and soaked to obtain the regenerated silk fibroin hydrogel fiber. The advantages are: good mechanical strength and softness, suitable for use as wound dressings or tissue scaffolds; high water content and good swelling properties, capable of absorbing wound exudate; the hydrogel fiber membrane has good drug release performance, can be loaded with drugs for antibacterial or wound repair promotion; it has excellent biocompatibility and mechanical properties, and has broad application prospects as a drug carrier and tissue repair material in tissue engineering and drug release fields.

The instant disclosure is directed to implantable electrospun structures for the delivery of active agents. An electrospun structure may comprise a first sheet and a second sheet. The first sheet and the second sheet may each comprise two supporting layers and an inner layer positioned between the two supporting layers, wherein a perimeter of one supporting layer is affixed to a perimeter of the other supporting layer, encasing the inner layer. The supporting layers may comprise a co-electrospun polymer fiber composition, and each inner layer may comprise an active agent blend-electrospun with a polymer fiber composition. All but one edge of the first sheet may be affixed to all but one edge of the second sheet, forming the electrospun structure, which may be a pouch. A method of using the pouch may comprise implanting it in a surgical site and, optionally, placing a medical device in the pouch.

A fiber having a polymer sheath and a core. The core has a liquid crystal and a compound capable of photoisomerization, such as that shown below. A method of: providing a first solution of a polymer, providing a second solution of a liquid crystal and compound capable of photoisomerization, and electrospinning the first solution and the second solution to form the fiber.

The invention relates to a thermally-induced anisotropic conductive film and a preparation technology thereof, and belongs to the technical field of new material preparation. The method comprises the following four steps: (1) preparing VO2 (M) by combining hydrothermal and high-temperature roasting; (2) synthesizing polymethyl methacrylate (PMMA) by a bulk polymerization method; (3) preparing a spinning solution; and (4) preparing the [PMMA] / / [VO2 / PMMA] Janus micro-ribbon array thermally-induced anisotropic conductive film by adopting a two-axis parallel electrospinning technology. When heating is carried out (80 DEG C), the prepared thermally-induced anisotropic conductive film has strong thermally-induced anisotropic conductivity, that is, high thermally-induced anisotropic conductivity is realized through heating. The preparation method is simple and easy to implement, batch production can be achieved, and the novel anisotropic conductive film material has wide application prospects.

The invention discloses a reprocessable dendritic nanofiber high-efficiency low-resistance air filtering membrane and a preparation method thereof, and particularly relates to a method for preparing the reprocessable dendritic nanofiber high-efficiency low-resistance air filtering membrane by dissolving a polymer material in a solvent, stirring to form a uniform and stable single polymer spinning solution, and then performing electrostatic spinning to obtain the reprocessable dendritic nanofiber high-efficiency low-resistance air filtering membrane. The manufacturing steps are simple and convenient, based on an innovative interface multi-fluctuation-point formation-multi-fluctuation-point anisotropic stretching-tearing electrospinning jet flow splitting behavior induction technical route, by means of a material matching strategy of reducing the surface tension of the solution and enhancing the dipolar force of the solution, high spinning voltage and low liquid supply rate are matched at the same time, and the spinning efficiency is improved. The electrospinning jet splitting behavior is synergistically induced, so that the dendritic nanofiber membrane is endowed with no less than five times of reprocessability, and the dendritic nanofiber membrane has a good application prospect.

The present disclosure relates to electrospun nanosorbent fibers, tailored for lithium extraction having enhanced physicochemical properties. The present disclosure further relates to methods of making the disclosed electrospun nanosorbent fibers and methods of using the disclosed electrospun nanosorbent fibers.

The application discloses a preparation method of an anti-adhesion, repair-promoting and antibacterial composite patch. L-lactide and glycolide are used as monomers to synthesize four-arm polylactic acid-glycolic acid 4arm-PLGA through ring-opening polymerization; then, L-lysine and 1,2-propylene glycol are used to prepare hydrophilic BLPD through esterification reaction, and the 4arm-PLGA is copolymerized with the 4arm-PLGA to obtain a block copolymer 4arm-PLGA-BLPD; subsequently, the proportion of PCL, the 4arm-PLGA-BLPD, the 4arm-PLGA and an antibacterial drug is regulated, and the composite patch is prepared through continuous electrospinning technology. The composite patch has good biosafety, antibacterial property, anti-adhesion between the patch and human organs and repair-promoting property, and has a wide application prospect in surgical operations, especially in hernia repair.

The invention discloses a shape self-maintaining radiation refrigeration phase change heat dissipation film and a preparation method and application thereof. The preparation method comprises the following steps: mixing and stirring hydroxylated boron nitride, lithium bromide, polyvinyl alcohol and water to obtain turbid liquid; immersing a non-woven fabric into the turbid liquid, and then carrying out heat treatment to obtain the phase change heat dissipation film; adding the polyvinylidene fluoride-hexafluoropropylene polymer particles into an organic solvent, uniformly dissolving to obtain an electrospinning precursor solution, and carrying out electrostatic spinning to obtain a radiation refrigeration film; the radiation refrigeration film is arranged on the upper layer, the phase change heat dissipation film is arranged on the lower layer, and the radiation phase change film is formed through bonding. Dual modes of moisture absorption heat dissipation and radiation refrigeration are adopted to strengthen passive heat dissipation, the efficient heat absorption and release characteristics of the phase change material are utilized, the temperature of equipment can be effectively adjusted, and the heat stability and safety of the equipment are improved; the radiation refrigeration technology has the advantages of high efficiency, energy conservation, no noise, environmental protection, good stability, simple structure and the like, and is suitable for refrigeration requirements in various scenes.

This invention provides a temperature and humidity responsive actuator and its preparation method. The actuator is a double-layer electrospun film actuator, composed of a sequentially electrospun polyacrylonitrile (PAN) fiber layer and a poly(N-isopropylacrylamide) (PNIPAM) fiber layer. This invention introduces electrospinning technology into the preparation of the actuator, selecting temperature-inert polyacrylonitrile (PAN) and temperature-sensitive poly(N-isopropylacrylamide) (PNIPAM) as the polymers for sequential electrospinning. Through a simple preparation process, an actuator with good temperature and humidity responsiveness can be efficiently prepared, and the prepared actuator exhibits high sensitivity, fast temperature and humidity response speed, and stable performance.

Core-shell microstructures made of a polymeric outer shell and a porous inner core that comprises a chemically-crosslinked polyamine, methods of preparing same and uses thereof are provided. The microstructures can be obtained, for example, by wet spinning, for example, wet mechanical spinning or by wet electrospinning using a solution comprising a polymeric material that forms an outer shell and a solution comprising a polyamine, and a hydrogel matrix that comprises a crosslinker for forming the chemically-crosslinked polyamine in the inner core.