16 results about "Electro spinning" patented technology

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.

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.

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.

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.

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.

This invention belongs to the field of nanomaterials, and particularly relates to an electrospun nanofiber membrane, its preparation method, and its applications. The electrospun nanofiber membrane provided by this invention is prepared by electrospinning a spinning solution containing polyurethane, polyvinylpyrrolidone, and Tb(BA)3phen. By optimizing the composition of the electrospinning solution, especially by doping with the functional material Tb(BA)3phen, this invention enables the membrane material to acquire a large number of triboelectric charge trapping sites, reducing charge dissipation and increasing the accumulation of triboelectric charge; simultaneously, it endows the membrane material with good flexibility, stretchability, and hydrophobicity. The electrospun nanofiber membrane provided by this invention combines excellent flexibility and high triboelectric output performance, showing promising application prospects in the field of triboelectric nanogenerators.

This invention discloses a method for preparing a composite nanofiltration membrane by electrospinning with a mixed solvent. The method includes dissolving polyacrylonitrile (PAN) in a mixed solvent of N,N-dimethylformamide (DMF) and dimethyl sulfoxide (DMSO), stirring the solution until it is completely transparent under water bath heating, and allowing it to stand to remove bubbles to obtain a PAN electrospinning solution; electrospinning the PAN solution to form a membrane, and then hot-pressing and drying it to obtain a PAN nanofiber membrane; impregnating the PAN nanofiber membrane with a piperazine (PIP) aqueous solution, tumbling it with a rubber roller, and adding a trimesoyl chloride (TMC) n-hexane solution to synthesize polyamide (PA) as the top layer to obtain a PA / PAN composite nanofiltration membrane. This composite membrane has high flux and rejection rate for both salts and dyes.

An electrochemical device component comprises at least one electro-spun fibre (1) comprising a core (2) and a sheath (3) surrounding the core. The core (2) comprises particles of an electrode active material (4) held together by a first polymeric material (6), and is electrically conductive along its length. The sheath (3) is formed from a second polymeric material, the second polymeric material being electrically insulating. The core (2) of the at least one electro-spun fibre (1) is arranged to provide a first electrode of an electrochemical device. The sheath (3) of the at least one electro- spun fibre (1) may be arranged to provide a separator between the first electrode and a counter electrode of the electrochemical device.

The present application provides a Enteromorpha polysaccharide composite sunscreen film and a preparation method and application thereof. The method comprises the following steps: S1: preparing a nano-spray solution containing Enteromorpha polysaccharide and a spinning solution containing nano-titanium dioxide particles and PVB, respectively; S2: spraying the nano-spray solution to the skin surface in need of sunscreen care through a nano-spray device; S3: electrospinning a titanium dioxide / PVB composite micro-nanofiber film in situ on the skin surface sprayed with the nano-spray solution through an in-situ electrospinning device, the titanium dioxide / PVB composite micro-nanofiber film is compounded with the Enteromorpha polysaccharide on the skin surface, thereby forming the Enteromorpha polysaccharide composite sunscreen film. The obtained sunscreen film has water resistance, dust resistance and biocompatibility, and also has high air permeability and skin adaptability, can effectively avoid the damage of free radicals generated by sunscreen agent titanium dioxide to the skin, can firmly adhere to the skin surface, has long-lasting sun protection, and is easy to remove from the skin, and after removal, there is no residue and the skin is not damaged.

The application discloses a kind of cross electrospinning composite nanofiber membrane and its preparation method and application.The membrane is with food-grade polymer ethyl cellulose and pullulan as base material, is prepared using cross electrospinning technology, and can load Nisin, oregano oil or probiotic bacteria.Ethyl cellulose provides hydrophobic support, and pullulan strengthens mechanical properties.The membrane has significant antibacterial activity on staphylococcus aureus after loading Nisin, and can be applied to strawberry preservation and preservation;On this basis, the introduction of oregano oil and Nisin compatibility can synergistically enhance the antibacterial and antioxidant properties of cross electrospinning membrane, which can effectively prolong the shelf life of chicken.In addition, when the membrane is used to load probiotic bacteria, it can improve the survival rate of bacterial cells in storage and simulated gastrointestinal fluid, achieve colon-targeted delivery, and affect intestinal flora metabolism.The application has antibacterial, preservation and probiotic protection functions, and has application prospect in the field of active food packaging and functional carrier.

The application discloses a lithium battery diaphragm prepared by coaxial parallel electrospinning, a method and application. The method comprises the following steps: S1, dissolving a fiber skeleton polymer and a fiber functional polymer in organic solutions respectively to form uniform core layer parallel solutions A and B; S2, dissolving a metal salt in a water solution containing a hydrophilic polymer to form a uniform shell layer spinning solution; S3, coaxial parallel electrospinning the core layer parallel solutions A and B and the shell layer spinning solution, and preparing a composite nanofiber membrane with metal salt nano-aggregates by means of interface effect; and S4, immersing the prepared composite nanofiber membrane in an alkali salt solution to cause an anion exchange reaction, then drying into a film, and then immersing the film in an acetonitrile solution containing TAPB and DHTP to react at room temperature. The prepared lithium battery diaphragm can eliminate resource waste and safety problems caused by thermal runaway of lithium batteries, and has important significance for development and application of lithium battery diaphragms.

The present application belongs to the technical field of microbial carrier preparation, and discloses a method for preparing a porous electrospun nanofiber biological carrier by an organic vapor swelling method. The method prepares nanofibers by an electrospinning technology, and then performs swelling treatment by using organic vapor to form a porous structure, thereby increasing the specific surface area and adsorption capacity of the fibers. By controlling the swelling conditions, the porous structure and pore size can be accurately regulated to meet different application requirements. The porous electrospun nanofiber biological carrier has good biocompatibility and biological activity, and is suitable for fields such as biological culture, pollution control, drug delivery and biosensing. The method is simple to operate and can be prepared on a large scale, and has a broad application prospect. The implementation of the present application not only provides a new method for preparing porous electrospun nanofibers, but also provides a new idea for the development of the field of biological materials.

The application discloses a silk fibroin-based piezoelectric sensing film induced by BTO conformation transition and a preparation method thereof. The sensing film is composed of regenerated silk fibroin (SF) and tetragonal barium titanate (BaTiO3) nanoparticles by electrospinning technology. The core of the application is that the polar surface charge of BaTiO3 nanoparticles is used to in-situ induce the silk fibroin molecular chain to transform from random coil to beta sheet crystal phase with piezoelectric activity under the synergistic effect of high-voltage electric field in electrospinning, and a double piezoelectric synergistic system of organic crystal phase and inorganic ceramic phase is constructed. Experiments prove that the sensing film has excellent flexibility, biocompatibility and extremely high low-frequency sensitivity (0.25Hz-1Hz), and is stable under 10000 times of cyclic loading. The application has important application value in the fields of flexible self-powered physiological sensing such as heart sound monitoring and pulse recognition.