546 results about "Nanofiber composites" patented technology

The present invention discloses a capacitive flexible pressure sensor and a preparation method thereof. The capacitive flexible pressure sensor comprises: a first flexible nanofiber thin layer; a second flexible nanofiber thin layer which is oppositely arranged with the first flexible nanofiber thin layer; a first electrode layer attached to the internal side of the first flexible nanofiber thin layer; a second electrode layer attached to the internal side of the second flexible nanofiber thin layer; and a nanofiber composite film dielectric layer arranged between the first electrode layer and the second electrode layer. The nanofiber thin is utilized to each module of the capacitive flexible pressure sensor to allow the whole sensor to have good permeability and high sensitivity, and the addition of the functional nanofiber materials allow the sensor measuring range to be widened so as to facilitate human body long-time wearing to perform real-time monitoring of human body weak vital sign signals.

The invention discloses a preparation method of a multilayer sandwich type electrostatic-spinning polymer nanofiber composite membrane. The preparation method comprises the steps of firstly, spinning a polymer spinning liquid into a fiber membrane in an electrostatic manner, then spraying a spraying liquid containing inorganic nano-particles to the surface of the electrostatic-spinning fiber membrane by virtue of a jetting technique, continuously spinning the fiber membrane, and repeatedly carrying out the steps according to specific conditions so as to prepare the multilayer sandwich type composite membrane. As the inorganic nano-particles are adhered to the surface of the fiber membrane, not only can the ultrahigh specific area and the specific structural advantage of a nanofiber be brought into full play, but also the selectable ranges of the spraying liquid and the polymer spinning liquid are flexible, so that spraying liquids containing different inorganic nano-particles can be sprayed to electrostatic-spinning fiber membranes made from different raw materials according to actual demands so as to prepare sandwich type composite membranes with different functions, stable structures and good properties, and the application range of the electrostatic-spinning polymer nanofiber composite membranes is expanded.

The invention relates to a high performance super-amphiphobic conductive multi-functional corrosion-resistant coating, which is characterized by comprising a bottom layer component and a surface layer component, wherein the bottom layer component is epoxy resins, epoxy curing agents, organic fluorines, polyaniline/carbon nanofibers composite materials, the surface layer component is organic fluorines, low surface energy modified nanofillers and fluorine silane coupling agents. The high performance super-amphiphobic conductive multi-functional corrosion-resistant coating can have the advantages of superamphiphobic, drag reduction, abrasion resistance and pit corrosion resistance, and is low in cost. The invention further provides a method for preparing the high performance super-amphiphobic conductive multi-functional corrosion-resistant coating.

The invention provides a nanofiber membrane. The nanofiber membrane is made of mixture by spinning. The mixture includes polymers and nanofiber materials in the mass ratio of 1:(0.01-0.2). The nanofiber materials are composed of photocatalyst and adsorbent. The adsorbent and the photocatalyst are used in the nanofiber membrane, the adsorbent can adsorb harmful gas in an adsorption chamber, the photocatalyst is capable of degrading and adsorbing harmful organics in holes of the adsorbent into carbon dioxide and water under the condition of indoor light rays and irradiation of a daylight lamp, and activates and regenerates the adsorbent in situ when decomposing the harmful organics on the adsorbent in the meantime, so that the adsorbent and the photocatalyst are reusable, and the nanofiber membrane has excellent air purification capacity. The invention further provides a preparation method of the nanofiber membrane and a nanofiber composite and a preparation method thereof.

The invention belongs to the field of nanometer materials and food packaging materials, and discloses a nanofiber composite membrane containing plant source antibacterial agents, a preparation method and application of the nanofiber composite membrane. The preparation method of the nanofiber composite membrane includes a first step of preparing 6%-10%, by mass, of polyving akohol solution, a second step of cooling the obtained polyving akohol solution down to 30-50 DEG C, adding 1%-3% of beta-cyclodextrin, carrying out magnetic stirring for 0.5-1 hour, and then cooling the mixtures down to indoor temperatures, a third step of adding 2%-8% of cinnamon essential oil to the solution of the second step, carrying out magnetic stirring for 1-2 hours at 25-40 DEG C, and obtaining spinning solution, and a fourth step of carrying out electrostatic spinning on the obtained spinning solution, carrying out vacuum drying, and obtaining the nanofiber composite membrane containing the plant source antibacterial agents. The sterilizing rate of the nanofiber composite membrane for staphylococcus aureus and escherichia coli is larger than or equal to 90%, and the nanofiber composite membrane has good tenacity, biocompatibility and degradability, and has wide application prospect in the field of the food packaging materials.

The invention provides a preparation method of a nanofiber composite membrane. The method includes the steps that a spinning solution and melt of a high-melting-point polymer are provided, a spinning solution and melt of a low-melting-point polymer are provided, and the melting point difference of the high-melting-point polymer and the low-melting-point polymer is not smaller than 10 DEG C; the spinning solution of the high-melting-point polymer and the spinning solution of the low-melting-point polymer are subjected to electrostatic spinning, and accordingly an electrostatic spinning high-melting-point polymer fiber membrane and an electrostatic spinning low-melting-point polymer fiber membrane are obtained; the low-melting-point polymer melt and the high-melting-point polymer melt are subjected to melt-blowing spinning, so that a melt-blowing spinning low-melting-point polymer fiber membrane and a melt-blowing spinning high-melting-point polymer fiber membrane are obtained; the melt-blowing spinning high-melting-point polymer fiber membrane and the electrostatic spinning low-melting-point polymer fiber membrane undergo composite hot pressing, or the melt-blowing spinning low-melting-point polymer fiber membrane and the electrostatic spinning high-melting-point polymer fiber membrane undergo composite hot pressing, and thus the nanofiber composite membrane is obtained. The nanofiber composite membrane has high tensile strength which reaches up to 22 MPa-32 MPa.

The invention relates to a molybdenum disulfide/nitrogen-doped carbon nanofiber composite material and a preparation method and an application thereof. The composite material is of a pipe sleeving structure, a molybdenum disulfide fiber core is arranged in the composite material and a nitrogen-doped carbon nanofiber shell is arranged outside the composite material; and a gap is arranged between the molybdenum disulfide fiber core and the nitrogen-doped carbon nanofiber shell. The preparation method comprises the steps of dissolving ammonium thiomolybdate and polymethyl methacrylate into a solvent and carrying out electrostatic spinning to obtain a polymethyl methacrylate/ammonium thiomolybdate nanofiber; carrying out drying and surface treatment, immersing the nanofiber into a pyrrole/hydrochloric acid solution, dropwise adding a ferric chloride/hydrochloric acid solution and carrying out in-situ polymerization to obtain the fiber coated with polypyrrole on the surface; and washing and drying the fiber, carrying out high-temperature reduction under the condition of taking an argon/hydrogen mixed gas as a protective atmosphere and then carrying out high-temperature carbonization under an argon condition. The composite material has high specific capacity and good cycle stability, and can be used as an efficient and safe novel negative electrode material of a lithium-ion battery.

A preparation method for super-hydrophobic and super-hydrophilic electrostatic spinning nanofiber composite membranes belongs to the field of the nanofiber composite membranes. For the method, the raw materials are easy to obtain, the process is simple, and the operation is convenient and quick. In the method, the electrostatic spinning technology is mainly adopted to prepare the polymer nanofiber composite membranes, different solvents and different treatment methods are adopted, the nanofiber composite membranes are super-hydrophobic or super-hydrophilic, and the mechanical property is improved. The preparation method is simple, the spinning process is stable, the fiber is small in diameter and light in weight, no pollution is caused, and the preparation method is widely applied to the fields of filter materials, construction paint, mineral floatation and the like.

The invention discloses a method for preparing a bioactive poly (lactic-co-glycolic acid)/collagen/hydroxyapatite composite fiber membrane for bone repair. The method comprises the following steps of: treating a poly (lactic-co-glycolic acid) electrospun nanofiber membrane by using plasma, coating collagen, and immersing the poly (lactic-co-glycolic acid) electrospun nanofiber membrane into a simulated human physiologic body fluid to mineralize to obtain the poly (lactic-co-glycolic acid)/collagen/hydroxyapatite composite fiber membrane. The preparation method of the invention has the advantages of simpleness, high speed and wide material sources. By adopting the method of plasma treatment and coating, the highly-bionic nanofiber composite membrane is prepared by the steps of introducing collagen with osteocyte epimatrix into the poly (lactic-co-glycolic acid) electrospun nanofiber membrane and depositing active hydroxyapatite onto the fiber membrane, thereby obtaining. The composite fiber membrane has the advantages of favorable combination properties and convenient operation, can effectively promote the capabilities of adherence, growth and calcification osteogenesis of osteoblasts and stem cells, and is hopeful to become an ideal active bracket for bone repair.

The invention discloses a preparation process of carbon nano-tube modification polyaniline nano fiber conductivity composite material. The characteristics of the invention are that conducting acid treatment for carbon nano-tube with concentrated mixed acid, adding carbon nano-tube which is treated with acid and aniline monomer into perchloric acid water solution according to the weight ratio of 1:6-1-32, and evenly dispersing through ultrasonic processing, using ammonium persulphate as oxidation agent, controlling the molar ratio of ammonium persulphate and aniline monomer within 1:2-1:8, and reacting under the ambient temperature to obtain polyaniline nano fiber/ conductivity composite material of polyaniline coating carbon nano-tube coexisting structure. The process has simple art, and is easy to be controlled. The composite material which is prepared has the characteristics of high electricity conductivity ratio and small influence by system pH valve, large specific surface and excellent electrochemistry property and the like, which is expected to be used on electrode material such as second lithium ion cell and super capacitor and the like.

Iodine doped bismuthyl carbonate nanosheet and molybdenum disulfide modified carbon nanofiber composites, preparation method and its application in wastewater treatment are disclosed. Bismuth citrate and sodium carbonate as precursors, sodium carbonate as a precipitating agent, dispersed in a mixed solution of water and ethylene glycol, sodium iodide as a iodine source, nano carbon fiber membrane act as the carrier, to synthesis carbon fiber membrane that modified by iodine-doped Bi₂O₂CO₃ nanosheets; then sodium molybdate and thioacetamide as precursors, dispersed in water to react to obtain iodine doped bismuthyl carbonate nanosheet and molybdenum disulfide modified carbon nanofiber composites. The composite material synthesized through a series of steps exhibit excellent photocatalytic activity for the degradation of Rhodamine B and can be recycled for many times. And this invention has the advantages of simple preparation process, easy recovery and multiple use, etc., and has industrial application prospect in water pollution treatment.

A coalescing media includes a compressed composite filter media comprising substrate layers and hydrophilic fine fiber layers for separating free water emulsified in fuels.

The invention relates to a high-wear-resistant anti-stripping electrostatic spinning nanofiber composite filter material and a spinning method thereof. The preparation method comprises the following step: in the electrostatic spinning process, performing one-step forming by controlling and regulating the solvent concentration/pressure difference/melting points of two different polymers/an electrostatic spray solvent, so as to obtain dense three-dimensional arc-hole structural composite filter material fully adhered to fiber lapping points, wherein the gram weight of a fiber layer is 0.01 to 30 g/m<2>, the wear resistance of the composite filter material is 600 to 3,000 circles, the anti-stripping intensity is 5 to 100 MPa, the filter efficiency to 0.008-2-mircon particles reaches more than 99.99%, the resistance pressure drop is below 25 Pa, and the clogging capacity is 100 to 3,000 g/m<2>. The spinning method has the advantages of simple preparation process and low cost, and the prepared composite filter material has wide application prospects in the fields of engine filtration, air compressor filtration, gas turbine filtration, indoor air purification and filtration, high-efficiency filtration and the like.

The invention relates to a method for reinforcing toughening a resin matrix composite material by nano-fiber, which belongs to the composite material field. The invention is characterized in that polymers of different molecular weight with the designed solubility parameter ratio ranging from 0.8 to 1.2 and the molecular weight above 2:1 are selected as core and shell structure high polymers; by using traditional electrostatic spinning, namely the uniaxial method, shell-core structure nano-fiber is prepared; then the shell-core structure nano-fiber is composited and cured with the resin matrix by the layer paving or mixing process so as to prepare a composite material; the polymers of the shell structure part can be dissolved or mutually reacted with the molecular part of the resin matrix; and finally the three-dimensional network chain of the cured composite material can be mutually entangled or reacted with the molecular chain of the shell structure polymer, thereby greatly improving the interfacial property of the composite material. Compared with traditional nano-fiber composite materials, the interfacial bonding of the nano-fiber and the resin matrix is good; and mechanical property of the resin matrix composite material can be significantly enhanced under smaller content of nano-fiber.

The invention provides a preparation method of a transition metal phosphide/core-shell nitrogen-doped carbon nanofiber composite material. The preparation method includes preparing a carbon nanofiberaccording to an electrospinning technique by taking a carbon-containing high-molecular polymer as a carbon source, coating the carbon nanofiber with an electroconductive polymer through surface polymerization, loading an MOF material onto the surface of the carbon nanofiber coated with the electroconductive polymer according to an in-situ growth method to obtain a precursor, and subjecting the precursor to high-temperature carbonizing and phosphating to obtain the transition metal phosphide/core-shell nitrogen-doped carbon nanofiber composite material. Activity test results show that the transition metal phosphide/core-shell nitrogen-doped carbon nanofiber composite material prepared by the preparation method has high electrocatalytic activity for total decomposition reaction of HER, OER and water and has high stability in acid-base media, thereby being a dual-functional catalyst that can replace precious metal and having a good development prospect in water electrolysis reaction.

The invention relates to a device and a method for batch preparation of blended yarn with an electrostatic spinning nanofiber composite short fiber network. The device is that a conveyor belt (17) isarranged on one side of a carding machine (1), an electrostatic spinning device (4) is arranged on the conveying belt (17), a bell mouth fixing device (6) is arranged on the other side of the conveying belt (17), a bell mouth (18) is arranged on the bell fixing device (6), a cylinder (7) is arranged on the other side of the bell fixing device (6). The method comprises preparation of functional spinning solution, preparation of functional nanofibers, preparation of a composite layer of nanofiber / short fiber network and preparation of electrostatic spinning nanofiber/short fiber blended yarn.The device is simple in processing, the operation is feasible, the prepared nanofibers / short fiber blended yarn has better functionality and nanofiber distribution uniformity, the grades and added value of traditional textiles are significantly improved, and the device and the method have a good application prospect of industrialization.

The invention belongs to the technical field of preparation of polymer materials and particularly relates to a preparation method of a MOFs-chitosan nanofiber composite membrane. The preparation method comprises: preparing chitosan nanofibers through an electrospinning method, and blending a synthesized MOFs material and the chitosan nanofibers so that the MOFs material and chitosan nanofibers arecompounded under the action of a cross-linking agent to form the MOFs-chitosan nanofiber composite membrane. The MOFs-chitosan nanofiber composite membrane effectively solves the problem of low strength, poor stability and poor dispersibility of the MOFs material in the chitosan fibers. The MOFs-chitosan nanofiber composite membrane has the advantages of high MOFs retention rate, high strength, excellent water resistance and excellent solvent resistance. The preparation method is simple and easy, the preparation conditions are mild, the preparation method is suitable for large-scale production, and the MOFs-chitosan nanofiber composite membrane can be used in the fields of dye adsorption, metal ion adsorption, gas adsorption and storage.

The invention discloses a copper-cobalt double-metal organic framework/nano-fiber composite material (CuCo-MOF@NF). A preparation method of the composite material includes the steps: firstly, preparing a copper-cobalt double-metal organic framework by a solvothermal method; secondly, mixing the copper-cobalt double-metal organic framework and a high-molecular polymer to prepare the copper-cobalt double-metal organic framework/nano-fiber composite material by an electrostatic spinning method. The composite material has excellent catalytic effects on azo-dyes such as rhodamine B (cationic dyes)and acid red 1 (anionic dyes) at normal pressure and temperature. The preparation method of the composite material is simple, a catalyst is convenient to operate and recycle, high in catalytic efficiency, good in stability and less in dosage, mass production of the composite material is easily achieved, and the composite material has an excellent application prospect in respects of catalytic degradation of azo-dyes in industrial wastewater and control of other pollutants.

The invention belongs to the technical field of transition metal sulfide-carbon materials, and particularly relates to a molybdenum sulfide/graphene/carbon nano fiber composite material and a preparation method thereof. The preparation method includes the steps that polyacrylonitrile nano fibers are prepared through electrostatic spinning, oxidized graphene/polyacrylonitrile nano fiber aerogel is prepared through mechanical stirring and freezing drying, then graphene/carbon nano fiber aerogel is prepared through high-temperature carbonization, and finally, molybdenum sulfide nanosheets grow in situ on the graphene/carbon nano fiber aerogel through the one-step hydrothermal method. The molybdenum sulfide/graphene/carbon nano fiber composite material prepared through the method has the advantages that the material has a three-dimensional porous space structure, conductivity is good and chemical properties are stable, and can serve as an ideal high-performance electro-catalysis material and electrode materials of new energy devices such as lithium ion batteries and solar batteries.

The present invention relates to a method for preparing a carbon nanofiber composite, and a carbon nanofiber composite prepared thereby. The method for preparing a carbon nanofiber composite provided by the present invention has reduced costs and is economical and efficient compared with a convention method for preparing a carbon nanofiber composite. In addition, the carbon nanofiber composite of the present invention can provide remarkable decomposition performance of organic pollutants, and a carbon nanofiber composite prepared by the preparation method of the present invention can be used in an electrode for an electric double-layer supercapacitor, a fuel cell electrode, a filter, a hydrogen storage material, and the like.

The invention relates to a preparation technology of a composite function membrane, in particular to preparation of a melt-blown polyphenylene sulfidenon-woven fabric a aramid fiber nanofiber composite membrane for a lithium ion battery, which belongs to the technical field of new energy materials. Aiming at the problems of poor imbibition capacity and insufficient temperature resistance commonly existed in an existing polyolefin composite membrane for the lithium ion battery, para-aramid nanofiber is prepared to be suspension dispersion liquid, the suspension dispersion liquid is coated on the upper surface of the melt-blown polyphenylene sulfide non-woven fabric, and the melt-blown polyphenylene sulfide non-woven fabric/aramid fiber nanofiber composite membrane is prepared. Compared with the existing polyolefin/aramid fiber nanofiber composite membrane, the electrolyte wettability, the heat stability, the mechanics and the chemical property of the melt-blown polyphenylene sulfide non-woven fabric/aramid fiber nanofiber composite membrane can be obviously improved. The preparation provided by the invention is simple in process step, easy to operate and low in cost, and has favorable industrial application future.