144 results about "Electrospun nanofibers" patented technology

The present invention is directed to the production of nanostructures, e.g., single wall carbon nanotubes (“SWNT”) and/or multi-wall carbon nanotubes (“MWNT”), from solutions containing a polymer, such as polyacrylonitrile (PAN). In particular, the invention is directed to the production of nanostructures, for example, SWNT and/or MWNT, from mixtures, e.g., solutions, containing polyacrylonitrile, polyaniline emeraldine base (PANi) or a salt thereof, an iron salt, e.g., iron chloride, and a solvent. In one embodiment, a mixture containing polyacrylonitrile, polyaniline emeraldine base or a salt thereof, an iron salt, e.g., iron chloride, and a solvent is formed and the mixture is electrospun to form nanofibers. In another embodiment, the electrospun nanofibers are then oxidized, e.g., heated in air, and subsequently pyrolyzed to form carbon nanostructures.

The invention provides a nanofiber load titanium dioxide photocatalyst and a preparation method thereof, which belong to the technical field of preparation of novel nanometer photocatalyst functional materials. The method comprises the following steps: preparing a homogeneous spinning solution with titanium precursor, a hydrolysis inhibitor, a polymer and an organic solvent; carrying out spinning according to a proper electrostatic spinning process to obtain a nanofiber felt/film; introducing hydroxyl groups into electrospun nanofiber, and immersing the electrospun nanofiber in an aqueous solution containing an ammoniation agent, so that hydrolysis and ammoniation reaction of titanium precursor occurs and produces titanium-ammino complex; and carrying out post treatment processes such as baking and the like to obtain the nanofiber load titanium dioxide photocatalyst. The catalyst has excellent photo-catalytic activity in response to ultraviolet light or visible light, and can effectively improve the bonding reliability of titanium dioxide with nanofiber with the help of the action of nitrogen bond.

An indicator device for determining the efficacy of an antimicrobial treatment process. The indicator device includes an active agent encapsulated in an encapsulation component. The encapsulation components preferably takes the form of an electrospun nanofiber including a polymer.

The invention relates to an efficient and low-resistance electrospun nanofiber air filter material and a batch preparation method. The filter material is of a sandwich structure formed by alternately arraying spun-bonded nonwovens and nanofibers; by the adoption of a pinfree type electrostatic spinning nozzle and by an electrostatic spinning and electrostatic spraying synchronous combination technology, a nanofiber/microsphere composite film is prepared; a revolving rotary drum is used as a receiving device, and the spun-bonded nonwoven is used as a receiving matrix, so that a nanofiber/nonwoven composite material is obtained; a layer of spun-bonded nonwoven covers the surface of the nanofiber/nonwoven composite material to form the sandwich structure with the spun-bonded nonwovens and the nanofibers which are alternately arrayed; the sandwich structure is bonded to obtain the efficient and low-resistance electrospun nanofiber air filter material. The preparation process is simple, and high in controllability and repetitiveness, and the prepared air filter material has the characteristics of high efficiency and low resistance, and is uniform in thickness and stable in filter performance; batch production of the nanofiber filter material can be realized; the efficient and low-resistance electrospun nanofiber air filter material has very good application prospect in the field of air filtering.

The invention relates to a multiple response type filtration-controllable electrospun nanofiber membrane and a preparation method thereof. Nanofibers are composed of electrostatic spinning thermosensitive and pH responsive polymers and solvents, and the multiple response type filtration-controllable electrospun nanofiber membrane is formed by putting a prepared mixed solution in an injector and then spinning of an electrostatic spinning apparatus. The multiple response type filtration-controllable electrospun nanofiber membrane and the preparation method thereof have the advantages that since smart response of the thermosensitive and pH responsive polymers in the spinning solution is combined with the advantages of large specific area, high porosity and loose and porous performance of the nanofibers, controllable filtration of air is achieved; the preparation method is simple and easy to implement, low in production cost, high in interception efficiency, low in resistance, rapid in filtration reaction, high in treatment efficiency, reusable and capable of achieving smart separability of the nanofiber membrane and can be applied to the fields such as filtration and adsorption, drug delivery, chemical separation, sensing drive and tissue engineering.

The invention discloses a preparation method of a force-sensitive stretchable electro-spinning patterning conductive nanofiber membrane. The preparation method comprises the following steps that (1) a high-molecular polymer and a conductive polymer are fully mixed and dissolved in an organic solvent, and therefore a spinning precursor solution is formed; (2) a patterning collection template is used for electrostatic spinning to collect electrospunpolymer nanofibers, a patterning conductive nanofiber membrane in a non-woven mode is formed on the collection template, and is taken from the collection template, and therefore the force-sensitive stretchable electro-spinning patterning conductive nanofiber membrane can be obtained, wherein the collection template is a metal template, a semiconductor template or an insulating plastic template, and a hollow or protruding pattern structure is arranged on the collection template. The nanofiber membrane prepared through the preparation method can achieve the purposes of high conductivity, good force-sensitive performance and good stability, and can bear large-scale two-dimensional stretching strain. The preparation method is simple and low in cost, and has the good application prospect.

The invention relates to a method for rapidly preparing electrospun nanofiber reinforced silica aerogel blocks with excellent mechanical properties by atmospheric pressure drying. Used nanofibers areprepared by electrospinning; the prepared nanofiber reinforced silica aerogel not only maintains the advantages of low density and high porosity, but also overcomes the disadvantages of poor integrityand large brittleness. Silica sol formed by hydrolysis of alkoxysilane is used as a receiving body of electrospinning, and the nanofibers are evenly dispersed in the silica sol; the silica sol is allowed to form gel with ammonia water as a catalyst, then the gel is aged and modified, and the electrospun nanofiber reinforced silica aerogel is obtained. The method has the prominent characteristicsthat the method does not need dangerous or expensive supercritical drying, the operation is simple, the process is controllable, the cycle is short, the cost is low, and the product can be produced continuously; the obtained product has excellent physical properties and excellent mechanical properties.

According to the invention, an electrospun nanofiber membrane is selected as a base membrane; meanwhile, through a simple doped cross-linking method, polyethyleneimine is introduced into a transitionlayer; and amine functional groups exposed in fiber exert great effects in the process of interfacial polymerization. Thus, the overall separation performance of a membrane is improved; meanwhile, a prepared membrane has good stability and good rejection effect on a dye; when a test pressure is 2 bar, the rejection rate of the membrane is 90% or above; and the prepared membrane has good pure waterflux which is in a range of 34.5 to 42.5 L m<-2>h<-1>bar<-1>. When the range of a pressure is in a range of 1 and 5 bar, the rejection performance of a composite membrane is basically unchanged, andthe flux and pressure are basically in a linear relationship, so a low-pressure nanofiltration membrane is prepared. In a stability test of 48 h, the composite membrane has good stability.

A membrane assembly adapted for use in capturing an analyte of interest, the membrane assembly comprising in one embodiment (a) an electrospun nanofibrous membrane, the electrospun nanofibrous membrane comprising a random mat of electrospun nanofibers, at least some of the electrospun nanofibers including one or more types of functional groups; and (b) at least one molecular recognition element immobilized on the random mat via a functional group, the molecular recognition element being adapted to selectively bind the analyte of interest. The membrane assembly may be incorporated into a sensor.

A plant wound dressing composed of a blend of polymers and methods for their manufacture and use are described.

The invention relates to a method and a device for preparing oriented electrospun nanofiber yarns based on a self-magnetic field. The method includes stably producing nanofibers; driving the nanofibers to move directionally by spiral air flow; forming conical nanofiber bundles in spiral movement; bundling and performing fine drawing to obtain the oriented electrospun nanofiber yarns. The device comprises a spinning nozzle, a liquid supply device, an insulating cover, a round metal ring and a winding device, wherein the spinning nozzle is communicated with the liquid supply device through a guide tube and is disposed below the insulating cover and under the round metal ring, the insulating cover is in the shape of a cone with two ends open, the round metal ring is fixed to the lower half portion of an inner cavity of the insulating cover through metal rods, a plurality of air nozzles are evenly circumferentially distributed on the inner sidewall of the insulating cover and above the round metal ring, and the winding device is arranged above the insulating cover. The method and the device have the advantages that the nanofiber yarns can be produced continuously and stably, the nanofibers are orderly in height orientation arrangement in the yarns, and the oriented electrospun nanofiber yarns are obtained finally.

The present invention is directed to a novel method and apparatus for facilitating and improving efficient application of nanofibers to the surface of poorly conductive three-dimensional objects using electrospinning. The apparatus and associated methods of the present invention provide a much more direct connection between the object and the grounded plate collector while allowing the object to be supported above the collector in a manner which promotes nanofiber deposition over the top, bottom and side surfaces of the object, closely covering all of its surfaces with nanofibers. Moreover, the deposition of electrospun nanofibers according to various embodiments of the present invention expands electrospinning technology to greater numbers of applications in which three-dimensional coatings of a wide nature are advantageous.

The invention relates to carbon-coated MoSe2/graphene nanofibers prepared by electrospining and a preparation method thereof. The nanofibers are composed of coated carbon, MoSe2 and graphene. The preparation method comprises the following steps: dissolving water soluble molybdenum salt and a high polymer in a mixed solution of deionized water and ethylene glycol, heating the mixed solution till a stable transparent sol is formed, adding the graphene into the molybdenum salt solution to form an electrospining solution; electrospining the electrospining solution to obtain hybridized fibers; and then vacuum sintering the hybridized fibers obtained in the step 2 and zero valent selenium powder in a tubular furnace to obtain a carbon-coated MoSe2/graphene nanofiber material. The fibers are uniform in shape and length, and MoSe2 crystals are uniformly distributed in the fibers and are coated by amorphous carbon; and the graphene as a conductive network is uniformly distributed in the fibers. According to the carbon-coated MoSe2/graphene nanofibers provided by the invention, the raw materials are easily available, the preparation process is simple and controllable reaction conditions are mild, and the obtained product has a relatively high specific surface area, excellent conductivity and structural stability and can be used as an ideal lithium/sodium ion battery cathode material and a high performance electrocatalytic material.

The invention provides a preparation method of nanofiber composite carbon aerogel and belongs to the field of nanofiber carbon aerogel. The method comprises the steps of obtaining a composite dispersion liquid of nanofibers and a support body by means of electrospinning and receiving of a support body dispersion liquid; obtaining the fluffy carbon aerogel through freeze-drying, pre-oxidation and carbonization treatment. According to the method for directly receiving the electrospun nanofibers through the support body dispersion liquid, the support body can be simultaneously diffused into fibernetworks in the spinning process, so that the step of mechanically dispersing and re-crosslinking fiber membranes in most preparation methods is omitted, and the problem of nonuniform dispersion of additives is also solved. The interior of the composite carbon aerogel prepared by means of the method is of an open pore structure formed by assembling the nanofibers and the support body, and the material has excellent mechanical performance and compression resilience. The carbon aerogel can be applied to environmental governance and has a good application prospect in the field of supercapacitorelectrode materials.

A nerve guidance conduit includes one or more guidance channels formed as porous polymeric structures. The guidance channels are within an outer tubular structure that includes randomly-oriented nanofibers. The guidance channels may have electrospun nanofibers on their inner and outer surfaces in a parallel alignment with the guidance channels. Such aligned nanofibers may also be present on the inner surface of the outer tubular structure. The outer surfaces of the guidance channels and the inner surface of the tubular structure define additional guidance channels. Such a nerve guidance conduit provides augmented surface areas for providing directional guidance and enhancing peripheral nerve regeneration. The structure also has the mechanical and nutrient transport requirements required over long regeneration periods.

The invention provides a drug-loaded nanofiber with drug gradient distribution characteristics. The nanofiber comprises an inner core layer, the periphery of the inner core layer is provided with an interlayer, the periphery of the interlayer is provided with an outer surface layer, the inner score layer, the interlayer and the outer surface layer extend coaxially, the inner core layer, the interlayer and the outer surface layer all contain drugs, and drug concentration increases in sequence from outside to inside in gradient distribution. The invention further provides a preparation method of the nanofiber with the drug gradient distribution characteristics and provides a device for achieving the method. According to the preparation method of the nanofiber with the drug gradient distribution characteristics, the preparation process is simple, and effective with single step, the prepared nanofiber inner core layer, interlayer and outer layer are clear in structure, and the nano is small in diameter, good in linearity, even in diameter distribution and smooth in fiber surface. The drug gradient distribution method is capable of providing an effective implementation method for the design and preparation of a great number of drug slow and controlled materials.

The invention discloses a polypyrrole supercapacitor composite electrode material on the basis of electrostatic spinning nano-fiber yarn forming technologies and a method for preparing the polypyrrolesupercapacitor composite electrode material. Electrodes are of core-spun yarn structures, skin layers are nano-fibers, polypyrrole which is a conductive polymer is attached to the surfaces of the nano-fibers, and core layers are conductive cotton yarns. The method includes carrying out alkali boiling, acid leaching and sensitization and activation on cotton yarns, and then treating the cotton yarns in chemical nickel plating mixed liquid at the temperature of 30-70 DEG C for 2-6 h to obtain the conductive cotton yarns; preparing core-spun yarns by the aid of the electrostatic spinning nano-fiber yarn forming technologies; polymerizing pyrrole monomers at the temperatures ranging from -2 DEG C to 10 DEG C to obtain supercapacitor polypyrrole electrodes. A molar ratio of the pyrrole monomers to anhydrous ferric trichloride is 1:1-3. The polypyrrole supercapacitor composite electrode material and the method have the advantages that the polypyrrole supercapacitor composite electrode material which is a polypyrrole electrode material prepared by the aid of the method has small diameters and large specific surface areas and is excellent in conductivity and energy storage stability; processes for manufacturing the polypyrrole supercapacitor composite electrode material are simple, the polypyrrole supercapacitor composite electrode material and the method are low in cost, are environmentally friendly and have broad application prospects, and the polypyrrole supercapacitor composite electrode material can be used as a supercapacitor electrode material.