61 results about "Electro spinning" patented technology

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 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.

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.

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 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 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.

The invention relates to the field of fuel cells and technologies, in particular to an electrospun composite proton exchange membrane based on polysulfonated dopamine modification and a preparation method thereof. The composite proton exchange membrane comprises a porous electrospinning fiber substrate which is coated and modified by self-polymerization of a sulfonated dopamine monomer, wherein the sulfonated dopamine monomer is any one of aromatic ring sulfonated dopamine, terminal sulfonated dopamine and amino sulfonylated dopamine; the porous electrospinning fiber substrate is filled with the trivalent cerium salt and the sulfonated polymer. By introducing the poly-sulfonated dopamine coating, the wettability and binding force of the sulfonated polymer can be remarkably improved, and uniform dispersion and fixation of Ce < 3 + > are promoted, so that the proton conductivity and chemical stability of the membrane are improved. The preparation method of the composite proton exchange membrane is simple and convenient, the composite proton exchange membrane has good interface compatibility, free radical degradation resistance and long-term operation stability, and the composite proton exchange membrane has good application prospects in proton exchange membrane fuel cells and water electrolysis devices.

The invention belongs to the technical field of cooling fiber membranes, and particularly relates to a coaxial electrospinning radiation phase change cooling fiber membrane and a preparation method thereof.The preparation method comprises the steps that a shell layer spinning solution is prepared, specifically, poly (vinylidene fluoride-co-hexafluoropropylene) is added into a mixed solvent of N, N-dimethylformamide and acetone, the mixture is heated and stirred for 6 h at the temperature of 45-60 DEG C, and a uniform solution is obtained; standing the uniform solution at room temperature for 6 hours to eliminate bubbles; preparing a core layer spinning solution, namely adding n-octadecane into trichloromethane, stirring for 30 minutes, and storing at 35 DEG C; spinning by adopting electrostatic spinning equipment and a 22G / 17G coaxial needle head, respectively transferring the shell layer spinning solution and the core layer spinning solution into an injector, connecting corresponding parts of the coaxial needle head, and adjusting electrostatic spinning parameters to carry out electrostatic spinning, so as to obtain a coaxial electrospinning radiation phase change cooling fiber membrane with a wrinkle structure; the weight-average molecular weight Mw of the poly (vinylidene fluoride-co-hexafluoropropylene) is 455000, and the number-average molecular weight Mn of the poly (vinylidene fluoride-co-hexafluoropropylene) is 110000.

The application discloses a gelatin / gallic acid antibacterial wound composite dressing based on silk fibroin and a preparation method thereof, and adopts a coaxial electrospinning process to prepare the dressing as follows: 1) preparing an outer layer solution: taking silk fibroin, using formic acid as a solvent, and adding gelatin to obtain electrospinning solution A as the outer layer solution, wherein the concentrations of the silk fibroin and the gelatin are 18-22% g / ml and 0.1-0.5% g / ml respectively; 2) preparing an inner layer solution: taking silk fibroin, using formic acid as a solvent, and adding gallic acid to obtain electrospinning solution B as the inner layer solution, wherein the concentrations of the silk fibroin and the gallic acid are 18-22% g / ml and 0.1-0.5% g / ml respectively; and 3) coaxial electrospinning to prepare the composite dressing. The composite dressing prepared from the silk fibroin, the gelatin and the gallic acid as raw materials has strong mechanical properties for the human body, is non-toxic and harmless, and has anti-inflammatory and antibacterial properties, and can promote wound healing.

A method for detecting aflatoxin (AFB1) by using an electro-spun nano-fibre membrane loaded with NH2-MIL-53(Al) comprises; dropwise adding a sample solution to be detected to the loaded membrane; incu

This invention presents two processes: the preparation of magnetite nanofibers (MNFs) composites and their application in secondary wastewater treatment under an intense magnetic field. The MNFs composites are synthesized using an electrospinning technique with a working distance of 15 cm and an applied voltage of 5-8 kV. The wastewater treatment process employs optimal conditions, including a contact time of 30-45 minutes, an MNF concentration of 0.8- 1 g / L, a pH range of 6-8, and a stirring rate of 150-200 rpm. Under these conditions, coupling with a magnetic field of 0.5-1 T achieves significant reductions of 92% in Chemical Oxygen Demand (COD) and 93% in Biological Oxygen Demand (BOD). In contrast, treatment without a magnetic field results in lower reductions of 74% for COD and 75% for BOD. The fibrous structure of the magnetite nanoparticles enhances the treatment efficiency by providing a larger surface area for pollutant removal.

The invention provides a nanofiber fluorine membrane composite fabric and a preparation process thereof, and belongs to the technical field of composite fabrics, and the preparation process comprises the following steps: S1, forming a one-way sweat guide layer on the outer layer of cotton cloth through electrospinning; s2, preparing a hollow fiber / nanofiber fluorine membrane composite layer; s3, laying the PA hot-melt net film layer on the one-way sweat guiding layer, then laying the hollow fiber / nanofiber fluorine film composite layer on the PA hot-melt net film layer, heating, laminating, fitting and cooling to obtain the nanofiber fluorine film composite fabric. The one-way sweat-guiding moisture-permeable fabric can achieve waterproof performance and has one-way sweat-guiding moisture-permeable performance.

An article comprising a multilayer matrix is provided, the matrix comprising a viscoelastic polymer film sandwiched between two or more layers of an elastic polymeric material; wherein each of the two or more layers of the elastic polymeric material is in the form of a fibrous mat; the fibrous mat (i) comprising a plurality of electrospun fibers characterized by an average cross-sectional dimension of between about 1 and about 5 microns, and (ii) characterized by an average pore size of between about 5 and about 50 microns; the viscoelastic polymer film characterized by a thickness of between about 10 and about 60 um; the viscoelastic polymer film characterized by a melting peak temperature of between 30 and about 45 °C; and the two or more layers of the elastic polymeric material comprising PLCL characterized by a Mw of between 78 and about 100 kDa. Methods of making the article are also provided.

The application provides an asymmetric anti-adhesion composite film and a preparation method and application thereof. The composite film comprises a bioactive layer and an electrospun fiber layer, and the electrospun fiber layer comprises a first fiber layer and a second fiber layer. The first fiber layer comprises fibers with a first diameter. The second fiber layer comprises fibers with the first diameter and fibers with a second diameter, and the first diameter is larger than the second diameter. The composite film has strong mechanical and degradation resistance properties, and is suitable for anti-adhesion applications of various moving organoids or tissues, so that the composite film still has structural integrity and functional integrity for a long time in these environments. One side of the composite film has adhesive fibers, and has stronger adhesion in a wet state, so that the composite film cannot be easily displaced when applied to moving organoids or tissues.

A non-woven filter media is provided that comprises a first layer including a blend of acrylic fibers and polypropylene, PP, fibers, a second layer, and a third layer arranged between the first layer and the second layer. The third layer comprises electrospun nanofibers.

The application belongs to the field of textiles, and discloses a fabric for adjuvant therapy of breast cancer and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing a fluorouracil FU and collagen tripeptide CTP compound FU-CTP, incorporating the compound into a core layer spinning solution, preparing a core-shell nanofiber membrane through electrospinning, and finally obtaining the fabric for adjuvant therapy of breast cancer. The fabric can release the compound FU-CTP in the form of micelles, CTP can carry FU, promote the transdermal penetration ability of FU, and enrich FU in the local breast to reach a therapeutic concentration, so that most side effects such as gastrointestinal side effects and bone marrow suppression caused by oral and intravenous administration of FU can be reduced.

The application belongs to the technical field of functional materials, and relates to a preparation method of Janus cellulose membrane based on waste plastic, which comprises the following steps: soaking waste qualitative filter paper in 1-10wt% dilute hydrochloric acid for 12-36 hours, cleaning the qualitative filter paper multiple times with ethanol and ionized water, and vacuum drying the qualitative filter paper at 50 DEG C for 4 hours to obtain a cellulose membrane CM; suspending and immersing the cellulose membrane CM in a 0.5-5g / L DA-HCl solution with a pH of 8.5, and soaking the cellulose membrane CM at 25 DEG C for 2-48 hours to obtain a super-hydrophilic dopamine modified membrane PDA / CM, which is vacuum dried at 50 DEG C for 12 hours; then electrospinning hydrophobic PET on the surface of the super-hydrophilic dopamine modified membrane PDA / CM, and vacuum drying the super-hydrophilic dopamine modified membrane PDA / CM at 50 DEG C, so that the Janus cellulose membrane based on waste plastic is obtained. The prepared functional membrane is applied to emulsion separation. The application has the characteristics of sustainability and cyclic regeneration.

The invention provides an air-permeable and moisture-permeable nanofiber fabric and a preparation method thereof, and belongs to the technical field of fabrics, the preparation method comprises the following steps: S1, preparing an electrospinning stock solution; s2, preparing a polytetrafluoroethylene porous nanofiber membrane; s3, preparing a modified polytetrafluoroethylene porous nanofiber membrane; and S4, sequentially laying nylon 66, TPU hot melt adhesive mesh wires, the modified polytetrafluoroethylene porous nanofiber membrane, TPU hot melt adhesive mesh wires and polyester from top to bottom, feeding the nylon 66, the TPU hot melt adhesive mesh wires, the modified polytetrafluoroethylene porous nanofiber membrane, the TPU hot melt adhesive mesh wires and the polyester into lamination equipment for lamination, and after lamination is completed, tiling, cooling and shaping to obtain the air-permeable and moisture-permeable nanofiber fabric. According to the invention, the durability of the nanofiber fabric can be improved while high air and moisture permeability of the nanofiber fabric is maintained.