106 results about "Electrospun fiber" patented technology

The invention discloses a bimetal MOFs-loaded electrostatic spinning fiber membrane for oil-water separation and a preparation method thereof, and belongs to the technical field of membrane separation, and the preparation method comprises the following steps: (1) preparing a hydroxyl-modified metal organic framework material MIL-53 (Al)-OH through a solvothermal reaction; (2) preparing an MIL-53 (Fe) precursor solution by using ferric salt, terephthalic acid, polyvinylpyrrolidone and an organic solvent, ultrasonically dispersing MIL-53 (Al)-OH in the MIL-53 (Fe) precursor solution, uniformly mixing, and soaking the electrostatic spinning fiber membrane in the MIL-53 (Fe) precursor solution for 1-3 hours; and (3) transferring the system in the step (2) into a reaction kettle, reacting at 130-150 DEG C for 10-15 hours to enable the bimetallic MOFs to grow on the surface of the electrostatic spinning fiber membrane, washing, and drying to obtain the bimetallic MOFs-loaded electrostatic spinning fiber membrane for oil-water separation. The bimetal MOFs-loaded electrostatic spinning fiber membrane has the advantages of good oil-water separation performance, strong antifouling ability and strong dye degradation ability.

A dry drug delivery system comprising a middle layer encased in two outer layers, the middle layer and the two outer layers each comprising a mixture of electrospun fibers. Also disclosed is a water-dissolvable dry device containing a physical mixture of a first fiber and a second fiber in which the first fiber and the second fiber are configured to react with each other and with a biological tissue upon hydration, and the device transforms into a hydrogel upon contact with the biological tissue. Further provided is a method for delivering a bioactive substance to a soft tissue using the system or device.

The invention discloses a solid electrolyte using an electrostatic spinning fiber membrane as a matrix and a preparation method and application thereof, and the preparation method of the solid electrolyte specifically comprises the following steps: (1) sequentially dissolving PVDF powder and commercial tetragonal phase BaTiO3 (BTO) powder in a mixed solvent of DMF and THF, and uniformly stirring with a magnetic stirrer to obtain a PVDF / BTO solution; and (2) carrying out electrostatic spinning on the PVDF / BTO solution to prepare a fiber membrane, drying, and carrying out a solution pouring method to prepare the composite solid electrolyte film. Compared with the prior art, the prepared solid electrolyte has excellent cycle performance, the ion transference number of the solid electrolyte is greatly increased, and the solid electrolyte has good lithium metal negative electrode compatibility.

The invention provides a pH response type self-repairing electrostatic spinning fiber material and a synthesis method and application thereof.According to the method, pH response type micro / nano containers are evenly distributed in a polymer matrix through the electrostatic spinning technology, so that the self-repairing function of a coating is achieved, and the method is particularly suitable for the field of anticorrosive coatings.

The invention relates to a eugenol liposome / chitosan / polyoxyethylene hydrophobic electrospun fibrous membrane and a preparation method thereof, and the method comprises the following steps: based on soybean lecithin and cholesterol, adding eugenol and Tween 80, preparing a lipid solution, injecting the lipid solution into water or a phosphate buffer solution, and preparing an eugenol liposome suspension with the eugenol embedding rate greater than 88%; preparing a cross-linked chitosan acetic acid solution based on chitosan and a cross-linking agent; preparing a polyoxyethylene acetic acid solution, and mixing the cross-linked chitosan acetic acid solution with the polyoxyethylene acetic acid solution to obtain a base material spinning solution; mixing the eugenol liposome suspension with a base material spinning solution to prepare a final spinning solution, and preparing the eugenol liposome / chitosan / polyoxyethylene hydrophobic electrospinning fiber membrane by adopting an electrostatic spinning method. The embedding rate of eugenol is high, the water contact angle of the fiber membrane can reach 90 degrees or above, the slow release effect on eugenol is good, and the antibacterial and fresh-keeping effects are improved.

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 multifunctional wound patch combined with electrical stimulation therapy and a preparation method and application thereof, and relates to the technical field of medical materials, and the multifunctional wound patch comprises a double-layer electrostatic spinning fiber membrane, a conductive ink layer and a conductive hydrogel layer. S-shaped concentric circle conductive electrode pairs written by conductive ink are integrated on the surface (directly in contact with the wound) of the hydrophobic fiber layer, and square conductive ports with corresponding sizes can be drawn at the tail ends of the two electrodes as required. And the surface of the conductive electrode pair is packaged by conductive hydrogel with an antibacterial function. An external electric signal can be transmitted to the electrode pair of the patch through the conductive port of the electrode pair, and then acts on a wound through the conductive hydrogel layer, so that on-demand electrical stimulation treatment on the wound is realized. According to the multifunctional wound patch combined with the electrical stimulation therapy, discharge of redundant seepage can be achieved, and it is guaranteed that the wound environment is good; the curcumin-loaded medicine has the effects of resisting bacteria, resisting oxidation and promoting healing on wounds.

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 flexible barrier laminate comprising a cellulose fiber-based substrate layer (1), a barrier layer (2) comprising an electrospun fiber web, deposited on one side of the substrate layer.

The invention relates to the technical field of composite membranes, in particular to a PLLA / DFSCs composite membrane and a preparation method thereof.DFSCs are cultured after being separated, then the DFSCs are inoculated to a PLLA electrostatic spinning fiber membrane to be cultured, and the final PLLA / DFSCs composite cell membrane is obtained. The method comprises the following steps: inoculating DFSCs to a PLLA bracket, and carrying out flat culture for 3 days to construct a P-CS composite cell sheet; compared with a traditional membrane (the culture period is 14-28 days), the P-CS composite membrane only needs to be cultured for 3 days, so that the culture time of the cell membrane is greatly shortened; compared with a traditional diaphragm (CS), the P-CS composite diaphragm has excellent mechanical strength and plasticity and is suitable for different defect surface plasticity.

This application discloses a photodynamic antibacterial fiber membrane and its preparation method and application, which relates to the field of functional materials, including: dissolving aggregation-induced luminescence photosensitive molecules in a first solvent to obtain a photosensitive molecule solution; dissolving the purified polymer in a second solvent and adding the photosensitive molecule solution to obtain a spinning precursor; regulating the orientation of the spinning precursor by electrospinning to obtain a fiber membrane; and regulating the crystallinity of the fiber membrane to obtain a photodynamic antibacterial fiber membrane. The preparation method provided in this application combines the polymer condensed state structure with aggregation-induced luminescence photosensitive molecules, using the polymer crystallization and orientation structure to provide a rigid confined domain for the photosensitive molecules; at the same time, the nanoscale of the electrospun fiber membrane is used to increase the contact area between the material and oxygen, synergistically improving the material's active oxygen yield.

The application provides a preparation method of a down-like heat storage and preservation material, and comprises the following steps: dissolving polylactic acid in a mixed solution of chloroform / acetone to obtain a polylactic acid solution; dissolving composite hollow spheres in a mixed solution of chloroform / acetone to obtain a composite hollow sphere solution; using the polylactic acid solution as a shell layer solution and the composite hollow sphere solution as a core layer solution, adopting a coaxial conjugate electrospinning instrument to prepare a fiber bundle, the spinning voltage is 12-14 kV, the distance between composite spinnerets is 25-30 cm, the flow rate of the shell layer solution is 0.5-3 mL / h, and the flow rate of the core layer solution is 0.5-3 mL / h, to obtain an electrospun fiber bundle; using the electrospun fiber bundle as a covering yarn and polylactic acid filaments as core yarns, the down-like heat storage and preservation material is obtained by covering. The application adopts the electrospinning method to prepare the fiber bundle, and adds the composite hollow spheres in the core layer of the fiber bundle, uses the electrospun fiber bundle as the covering layer and the ordinary filaments as the core layer, so that a heat storage and preservation effect of the down-like heat storage and preservation material is better than that of ordinary air long down material.

A barrier laminate comprising a substrate layer (1), a connection layer (2) comprising an electrospun fiber network, and a non-fiber-based sealing layer (3), adjacent to the connection layer (2) and facing the outside of the laminate.

A porous membrane can include a first plurality of near-field electrospun fibers that are substantially parallel one to another. A second plurality of near-field electrospun fibers can be deposited over the first plurality of fibers. The second plurality of fibers can also be substantially parallel one to another. The second plurality of fibers can be transverse to the first plurality of fibers, such that the second plurality of fibers cross the first plurality of fibers to form pores between adjacent fibers of the first plurality of fibers and adjacent fibers of the second plurality of fibers.

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.

The invention discloses a special adsorption dressing used after a laparoscopic surgery, and belongs to the technical field of medical dressings. The dressing is of a layered composite structure and sequentially comprises a hydrophilic guide layer, an absorption foam layer and a hydrophobic protective layer from inside to outside, the hydrophilic guide layer is an electrospun fibrous membrane formed by micro / nano fibers oriented along a specific direction; the absorption foam layer is made of a foam material with high aperture ratio; the hydrophobic protective layer is a breathable hydrophobic film; the preparation method mainly comprises the steps of preparation of each functional layer and composite molding through a low-temperature hot pressing process. According to the dressing, through the synergistic effect of the three layers of materials, directional and rapid absorption and storage of percolation of a postoperative puncture hole are achieved, tissue regeneration guidance is provided, the skin around a wound is effectively prevented from being hardened, and the dressing is antibacterial, anti-inflammatory, good in fitting performance and beneficial to wound healing.

The invention belongs to the field of filter materials, and relates to a composite microfiber filter material as well as a preparation method and application thereof. The material comprises a polylactic acid electrostatic spinning fiber layer and a polylactic acid melt-blown fiber layer which are compounded together, the polylactic acid electrostatic spinning fiber layer is prepared from an electret polylactic acid composition through electrostatic spinning, and the polylactic acid melt-blown fiber layer is prepared from the electret polylactic acid composition through melt-blown molding; the electret polylactic acid composition is prepared from the following components in parts by weight: 100 parts of polylactic acid, 0.2 to 4 parts of a composite electret, 0.2 to 2.5 parts of a plasticizer, 0.05 to 0.5 part of a dispersing agent and 0.01 to 0.5 part of an antioxidant. The composite microfiber filtering material comprises the melt-blown layer and the electrostatic spinning superfine fiber layer, the melt-blown layer is used for coarse filtration, the electrostatic spinning superfine fiber layer is used for fine filtration, the problems that the filtering performance of a single melt-blown layer is insufficient and the filtering resistance of a single electrostatic spinning layer is too large can be solved, and the effects of high efficiency and low resistance are achieved.

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.

The invention discloses a double-bionic wound dressing with seepage management and self-power generation functions as well as a preparation method and application of the double-bionic wound dressing. The double-bionic wound dressing comprises a first electrode layer, a blocking layer, a moisture absorption power generation layer, a diffusion antibacterial layer, an evaporation power generation layer and a second electrode layer which are sequentially stacked from bottom to top. The electrostatic spinning fiber membrane with high biocompatibility is adopted, a liquid transport mechanism of plant transpiration and an ion active transport principle of electric ray power generation cells are combined through bionic design, the triple functions of wound surface antibiosis, efficient seepage management and stable power generation are achieved, the wound surface microenvironment is regulated and controlled, and the wound surface antibacterial effect is achieved. Excessive inflammation caused by seepage accumulation is effectively avoided, fibroblast migration, angiogenesis and skin appendage regeneration are remarkably promoted, wound healing is accelerated, skin function recovery is facilitated, and a new treatment mode is provided for burn wound repair.

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 invention discloses a polybenzoxazine-based mesoporous active carbon nanofiber as well as a preparation method and application thereof, and belongs to the technical field of carbon nanofiber material preparation. Silica particles are taken as a template, polybenzoxazine is taken as a carbon source, polyvinyl butyral is taken as a spinning polymer, and an electrostatic spinning fiber membrane is prepared by proportioning metal salt and anhydrous stannous chloride; carrying out carbonization treatment to obtain a PBZ-based carbon nanofiber membrane; the preparation method comprises the following steps: putting a carbon nanofiber membrane into a hydrofluoric acid solution, carrying out chemical activation on the carbon membrane, melting a SiO2 template, washing the membrane to be neutral by using deionized water, and putting a polybenzoxazine-based active carbon nanofiber membrane into a blast drying oven to remove moisture, so as to prepare the active carbon nanofiber with high mesoporous rate, which has the advantages of a carbon material and a nano material. The polybenzoxazine-based carbon nanofiber membrane prepared by a template method can effectively increase the mesoporous rate, the high porosity can provide a channel for molecular transport, and potential application prospects are provided for active carbon nanofibers.

The invention belongs to the technical field of biomedical materials, and particularly relates to ultrasonic-excited piezoelectric delivery exosome electrostatic spinning and a preparation method thereof.The piezoelectric delivery exosome electrostatic spinning comprises piezoelectric electrostatic spinning prepared by embedding barium titanate nanoparticles into polylactic acid, the surface of the piezoelectric electrostatic spinning is modified by chitosan and then loaded with exosome, and the surface of the piezoelectric electrostatic spinning is loaded with the exosome. The preparation method comprises the following steps: preparation of piezoelectric electrostatic spinning: dissolving polylactic acid in hexafluoroisopropanol, adding barium titanate nanoparticles, and carrying out ultrasonic dispersion to form a uniform precursor solution; piezoelectric electrostatic spinning containing barium titanate is prepared through high-voltage electrostatic spinning; piezoelectric electrostatic spinning surface modification: immersing the piezoelectric electrostatic spinning into a chitosan solution for incubation, and modifying the piezoelectric electrostatic spinning to form piezoelectric electrostatic spinning with positive electricity on the surface; the modified piezoelectric electrostatic spinning is soaked in an exosome suspension to be incubated, and piezoelectric exosome delivery electrostatic spinning is prepared and has the self-energy-supply function, the space-time response function and the biological delivery function, the defects of traditional biological medicine materials are hopefully overcome, and the piezoelectric exosome delivery electrostatic spinning can be applied to the field of biological medicine materials. The clinical transformation application of the intelligent biological material in the chronic wound repair of diabetes mellitus is promoted.

The present invention provides a fibrous mat comprising a plurality of electrospun fibers wherein each electrospun fiber comprises a shell and a core comprising a water-soluble polymer and a plurality of cells, e.g., dormant cells. The invention further provides methods of activating dormant cells and methods of use thereof, such as for supplementing cosmeceutical ingredients to the skin of a subject.

The invention relates to lithium-based battery systems and, more particularly, to electro-spinable solution compositions, electro-spun sulfur-polymer fibers, e.g., wires and yarns, and their use in preparing high performance sulfur mattes, e.g., electrodes, for lithium-sulfur batteries with potential applications in small-scale mobile devices. The sulfur-polymer fibers have nanoscale dimensions and yarn-like morphology. The sulfur-polymer fibers can be prepared by co-dissolving sulfur and polymer in a solvent for forming the electro-spinable solution, and electrospinning the solution. The electrospun fibers can be used to form a composite that includes alternating layers of the electrospun fibers and polymer on a current collector.

A dry drug delivery system comprising a middle layer encased in two outer layers, the middle layer and the two outer layers each comprising a mixture of electrospun fibers. Also disclosed is a water-dissolvable dry device containing a physical mixture of a first fiber and a second fiber in which the first fiber and the second fiber are configured to react with each other and with a biological tissue upon hydration, and the device transforms into a hydrogel upon contact with the biological tissue. Further provided is a method for delivering a bioactive substance to a soft tissue using the system or device.

The invention discloses a synthesis method for preparing an MOF electrostatic spinning fiber material based on cell crushing combined with electric spraying, and belongs to the technical field of functional nano composite materials. The invention provides a preparation method of an MOF electrostatic spinning fiber composite material, which comprises the following steps: preparing an MOF material (UiO-66-NH2) in a green synthesis manner, performing ultrasonic cell crushing treatment to form a uniform and stable dispersion liquid, and uniformly loading MOF particles on the surface of a PAN / PVDF nanofiber by combining an electrostatic spinning technology and an electric spraying method to obtain the MOF electrostatic spinning fiber composite material. The problems of MOF agglomeration and uneven distribution are effectively solved, and the prepared MOF composite nanofiber material has good application prospects in the fields of gas separation, filtration, flexible devices and the like.

The invention discloses a heat-resistant high-molecular-weight polypropylene filter material and a preparation method thereof, and particularly relates to the technical field of high-molecular-weight materials, and relates to a heat-resistant high-molecular-weight polypropylene filter material and a preparation method thereof. The heat-resistant high-molecular-weight polypropylene filter material is prepared from an inorganic filler, a polypropylene resin, 4-methyl-1-pentene, an antioxidant, calcium stearate, dicumyl peroxide, and 4-vinyl benzoic acid glycidyl ester. The components and weight proportions of the raw materials for preparation are as follows: 0.8-1.5 parts of the inorganic filler, 65-85 parts of the polypropylene resin, 6-10 parts of 4-methyl-1-pentene, 0.1-0.3 parts of the antioxidant, 0.1-0.3 parts of the calcium stearate, 0.2-0.6 parts of dicumyl peroxide, and 1-5 parts of 4-vinyl benzoic acid glycidyl ester. The invention is constructed by a preparation process of mixing melt-blown fibers and electrospun fibers, thereby providing sufficient mechanical strength and stability for the entire filter material, efficiently intercepting tiny particles, improving filtration accuracy, and achieving a smooth transition between fibers of different sizes.

The invention relates to a magnetic induction curing fiber reinforced composite material as well as a preparation method and application thereof, and belongs to the technical field of fiber reinforced composite materials. In order to solve the problem of weak interlayer performance of the existing fiber reinforced resin-based composite material, the invention provides a method for magnetically inducing and curing the fiber reinforced composite material, which comprises the following steps of: preparing an electrostatic spinning fiber membrane containing nano magnetic powder as an interlayer, and paving the electrostatic spinning fiber membrane between prepreg or other fiber reinforced body layers to form a composite material blank; in the resin gel stage in the composite material curing process, a strong magnetic field is applied in the thickness direction, so that the magnetic particles in the interlayer film are oriented and arranged along the magnetic field direction to form a reinforced chain. The interlayer magnetic powder is induced to be directionally arranged through a magnetic field, an effective reinforcing structure is formed in the thickness direction of the composite material, and the interlayer shear strength and the layering resistance of the composite material are remarkably improved. The method is simple in process, remarkable in effect and suitable for manufacturing high-performance composite materials in the fields of aerospace, transportation and the like.

The present disclosure provides a PI-in-situ functionalized bimetallic MOF / phosphoric acid proton exchange membrane and a preparation method and an aqueous organic flow battery. The preparation method comprises: sequentially adding diamine monomers and dianhydride monomers in a polar solvent and stirring to form a viscous polyamide acid spinning solution; electrospinning the spinning solution to obtain a PAA fiber membrane; gradient temperature imidization of the PAA fiber membrane to obtain a PI electrospun fiber membrane; plasma pretreatment of the PI electrospun fiber membrane to obtain a surface-activated PI electrospun fiber membrane; placing a sulfonated modified bimetallic MOF reaction solution and the PI electrospun fiber membrane in a reaction kettle by a solvothermal in-situ growth method to obtain a PI@ sulfonated modified bimetallic MOF composite fiber membrane; soaking the PI@ sulfonated modified bimetallic MOF composite fiber membrane in a phosphoric acid solution containing a silane coupling agent for soaking treatment, and then performing heat pressing densification and drying treatment to obtain a PI-in-situ functionalized bimetallic MOF / phosphoric acid composite proton exchange membrane.

The application belongs to the technical field of new materials of multilayer structure, and discloses a kind of high-temperature and high-humidity resistant oil-resistant food preservation composite nanometer membrane and preparation method thereof.The method comprises the following steps: (1) polylactic acid solution is electrospun to form electrospun fiber membrane; (2) on one side of the obtained electrospun membrane, antimicrobial A-containing konjac gum solution is electrostatically sprayed; (3) on the side where electrostatic spraying is completed, polylactic acid solution is electrospun again; (4) the outer side of the obtained product of step (3) is electrostatically sprayed with modified konjac gum and chitosan composite solution containing antimicrobial B.The food preservation composite nanometer membrane obtained by the application has excellent high-temperature and high-humidity resistance, and the tensile strength loss rate is less than 7% and the elongation at break loss rate is less than 11% under the conditions of 45 DEG C temperature and 95% humidity for 24 hours; meanwhile, it also has excellent antibacterial rate, and the antibacterial rate on escherichia coli can reach 99.9%.