109results about "Conjugated artificial filaments" patented technology

The invention relates to the technical field of water electrolysis hydrogen production, in particular to a self-supporting hollow carbon membrane electrode and a preparation method and application thereof.The preparation method comprises the following steps that a self-supporting hollow carbon nanofiber membrane with metal M and metal M compound heterojunction is prepared through a coaxial electrostatic spinning technology; the self-supporting electrode with a high specific surface area and a rapid mass transfer channel is formed by regulating and controlling the flow rate of the spinning solution of the outer layer and the inner layer and a high-temperature carbonization process, the metal M is selected from one of iron, cobalt, nickel, manganese and molybdenum, and the metal M compound is one of oxide, hydroxide, carbide, nitride, phosphide and chalcogenide. Compared with the prior art, the self-supporting hollow carbon membrane electrode disclosed by the invention has good mechanical stability, good hydrophilic and hydrophobic properties and excellent HER and OER bifunctional catalytic activity, and can be used for efficiently and completely decomposing water.

The invention discloses an MXene / rGO (at) SA coaxial composite fiber based on a core-shell structure and a preparation method and application thereof, and belongs to the technical field of nano composite materials and flexible electronics. The invention solves the problems of many interface defects, unstable performance and the like of the existing coaxial fiber. The MXene / rGO-SA coaxial composite fiber is prepared by adopting a coaxial wet spinning method, a high-performance SA fiber with excellent mechanical properties is used as a tough shell layer, a multi-element nano material MXene / rGO composite fiber is used as a core layer, a calcium chloride-ethanol mixed solution in a certain proportion is used as a coagulating bath, and the coaxial composite fiber is prepared by utilizing a coaxial needle head; the interface bonding force and the conductive network of the MXene / rGO (at) SA coaxial composite fiber are optimized by accurately controlling the core-shell ratio, and the mechanical strength, the conductivity and the stability are synergistically improved.

The invention discloses a flexible light heat-insulation streamline oxide nanofiber aerogel and a preparation method and application thereof.The fiber aerogel is prepared through preparation of a spinning precursor solution, an air flow spinning technology and a heat treatment process, the spinning solution is stretched into fibers through the air flow spinning technology, and under the influence of a flow field, the flexible light heat-insulation streamline oxide nanofiber aerogel is obtained. The fibers present streamlines with different curvatures, high-quality dry fibers are obtained through a heating field, and the high-quality dry fibers are stacked in a receiver to form a three-dimensional structure; and finally, the three-dimensional streamline oxide nanofiber aerogel with ultralow thermal conductivity and low density is obtained by combining thermal treatment with a folding process, has excellent thermal protection performance and can be widely applied as a light high-temperature-resistant thermal insulation material.

The present invention belongs to the field of biomedical engineering technology, and specifically relates to a hydrogel microfiber carrying pancreatic islet α and β cells, a preparation method and an application thereof; the preparation method comprises: dissolving a photoinitiator in a cross-linked water-soluble polymer solution, filtering and sterilizing, adding pancreatic islet α and β cells to obtain a hydrogel cell prepolymer solution, passing the hydrogel cell prepolymer solution into an inner phase tube, passing an ionically cross-linked aqueous phase solution into an outer phase tube, and adjusting the flow rates of the solutions in the inner and outer phase tubes so that the liquids form a mutually immiscible laminar flow state; in a microfluidic device, after the inner phase solution contacts the outer phase solution, the ionically cross-linked components in the inner phase solution undergo ionically cross-linking with the outer phase solution to preliminarily form hydrogel microfibers, which are then secondary cross-linked by 405nm blue light irradiation to ultimately form hydrogel microfibers carrying pancreatic islet α and β cells.

The present invention discloses a novel gas-sensitive material, specifically a method for preparing a core-shell nanofiber gas-sensitive material based on a platinum-doped cobalt oxide / tin oxide heterostructure. The present invention utilizes a cobalt source, a tin source, a platinum source, and a polymer as raw materials, and produces a nanoscale platinum-doped cobalt oxide / tin oxide gas-sensitive material with high sensitivity and rapid response to hydrogen sulfide gas via coaxial electrospinning. This gas-sensitive material exhibits excellent gas-sensing properties for H2S gas at room temperature, with a short response time, enabling rapid detection of low-concentration H2S gas, a short recovery time, and excellent cyclic stability. Therefore, the gas-sensitive material of the present invention possesses excellent sensitivity and stability, and has broad application prospects, including applications in environmental monitoring, industrial safety, and gas sensors.

The present invention discloses a triaxially spun superelastic and high-temperature resistant composite carbon nanofiber aerogel and a preparation method thereof. The aerogel is formed by interweaving curly fibers with a core layer of carbon and a shell layer of oxide ceramic. The present invention utilizes electrostatic spinning technology to prepare composite carbon nanofiber aerogels. First, an inner layer polyacrylonitrile solution is prepared, and the water / alcohol ratio is adjusted to prepare a middle layer ceramic sol with controllable water content, thereby obtaining a spinning solution with compatibility in the initial spinning stage. The temperature and humidity of the airflow of the outer nozzle are then regulated, and the water content of the ceramic sol is further adjusted during the spinning process, so that the spinning solution becomes incompatible. The spinning solution jet is fast and solidified in advance, thereby obtaining a curly interwoven structure nanofiber aerogel precursor. Finally, the final product is obtained by changing the atmosphere and performing rapid and continuous heat treatment. The present invention solves the problems of insufficient mechanical properties and easy oxidation of carbon nanofiber aerogels. The preparation method is simple and easy to implement, and the process is continuous, and can be carried out on existing electrostatic spinning production equipment.

The invention relates to the technical field of composite materials and 3D printing, in particular to a carbon nanotube composite fiber with magnetic nanoparticles attached to the surface, a preparation method and application. The carbon nano tube and the magnetic nano particle composite fiber are mixed and further mixed with the SiC powder, so that the novel composite material with high strength, high conductivity and good thermal stability is formed, and the novel composite material also has the magnetic responsiveness of the magnetic nano particles and the wear-resistant and corrosion-resistant characteristics of the SiC powder. The composite fiber reinforced SiC material is formed through the 3D printing technology, higher strength, elasticity modulus, design flexibility and magnetic responsiveness can be obtained, hollowed-out, complex and special-shaped structures can be prepared, performance is good, and the composite fiber reinforced SiC material is more suitable for special purposes such as aviation, medicine and military affairs.

The invention discloses a nano-zinc oxide modified antibacterial fiber and a preparation method thereof, and relates to the technical field of functional fiber materials. The prepared nano-zinc oxide modified antibacterial fiber is based on natural polysaccharide, natural vegetable gum and a self-prepared nano-zinc oxide compound, an electrostatic spinning process is adopted, the nano-zinc oxide modified antibacterial fiber has good antibacterial performance, anticoagulation performance, biocompatibility and physical performance and has emergency sterilization and long-acting antibacterial functions, most of materials of the nano-zinc oxide modified antibacterial fiber are from natural substances, and the nano-zinc oxide modified antibacterial fiber is environmentally friendly. The invention is green, healthy and non-toxic, and provides a green and safe solution for medical and hygienic products.

The present invention relates to a method for manufacturing a composite filament for a filler comprising collagen and a composition comprising same, wherein the composition exhibits improved dispersibility in a solvent. Specifically, the filler composition of the present invention has enhanced filler retention and excellent storability. When formulated as an injectable preparation, the filler composition exhibits improved dispersibility and allows the amount and site of injection to be easily controlled so that the filler composition does not form lumps or aggregates after filler injection and is easy to control according to the intention of the practitioner.

The invention relates to a biodegradable continuous tubular reactor, the wall of which comprises at least one cylindrical layer based on a polyanionic compound chelated by an at least divalent cation, and the central space of which comprises a cross-linkable fluid free of polyanionic compound.

The filament count of carbon fiber tows is increased by spreading and merging the carbon filaments of a first tow with the carbon filaments of a second tow. The carbon filaments of the first and second tows are spread apart using a gas stream. The spread tows are aligned with each other and contact each other as they pass over the grid in the presence of the same or different gas stream, thereby forming entangled tows. The entangled tows are then formed into a combined tow. The modulus and denier of the carbon filaments in the first and second tows can be the same, or they can be altered to provide a combined tow having a wide range of filament counts and filament combinations.

The invention discloses a germanium telluride thermoelectric fiber coated by interface modified high borosilicate glass and a preparation method of the germanium telluride thermoelectric fiber. The preparation method comprises the following steps: placing columnar antimony trioxide in a cladding glass tube in an inert environment, heating a high borosilicate glass tube to a temperature above the melting point of the antimony trioxide, and carrying out antimony ion thermal diffusion treatment in which the molten antimony trioxide is thermally diffused to the inner wall of the glass tube; after the diffusion is finished, quickly pouring the antimony trioxide melt out of the cladding glass tube, and cooling to room temperature to obtain an interface modified glass tube; and then in an inert environment, placing the columnar germanium telluride in an interface modified glass tube with the inner surface modified, heating to a temperature above a high temperature point of a germanium telluride melting point and a high borosilicate glass softening point, melting, and drawing at 900 + / -50 DEG C to prepare the germanium telluride thermoelectric fiber which has a continuous fiber core and passes through an interface modified high borosilicate glass cladding. The problem that the composite thermoelectric fiber with the continuous fiber core cannot be drawn in the prior art is effectively solved.

The invention relates to an electrostatic spinning multifunctional packaging film with pH double responsiveness and a preparation method and application thereof, and belongs to the technical field of food packaging storage and detection. Oxidized sodium alginate with different oxidation degrees is obtained through periodate induction, the oxidized sodium alginate and carboxymethyl chitosan with amino are subjected to green crosslinking, polyvinyl alcohol is used as a spinning aid, then Nisin and anthocyanin are added into the polyvinyl alcohol, and the multifunctional packaging film with preservation and monitoring functions is prepared in combination with electrostatic spinning equipment. The packaging film obtained by the invention can intuitively reflect the change condition of freshness through rapid color change caused by the change of decay indexes of strawberries in the storage period on the basis of the high pH sensitivity of anthocyanin; under the same pH change condition, the release of Nisin can be intelligently regulated and controlled through the unique pH response characteristic of a Schiff base bond formed between oxidized sodium alginate and carboxymethyl chitosan, so that long-acting bacteriostasis is realized, and the shelf life of strawberries is remarkably prolonged.

The invention discloses a preparation method of alginate fibers and the alginate fibers, the preparation method comprises the following steps: (1) taking seaweed raw materials, crushing, pickling, adjusting the pH value to 5.5-8.5 after pickling, and adjusting the viscosity to obtain a seaweed solution; (2) mixing the seaweed solution with the sodium alginate solution to obtain a spinning solution; and (3) taking the spinning solution for spinning, drafting and post-processing to prepare the alginate fiber. According to the method, the seaweed raw materials are crushed and then subjected to acid treatment, components not suitable for spinning can be efficiently separated out, main spinning components and a plurality of bioactive factors in the components can be reserved, the process for preparing the seaweed fiber is continuous, simple and efficient, and the method has the outstanding characteristics of energy conservation and consumption reduction and the advantage of reducing the production cost; low-cost and large-scale fibrosis application of seaweed resources is facilitated; the alginate fiber prepared by the invention not only has excellent antibacterial and flame-retardant properties, but also is rich in seaweed bioactive factors, and green, safe, environment-friendly and healthy production and life are promoted.

The application provides a bubble-assisted wet spinning device, a wet power fiber material, a preparation method and application, and belongs to the technical field of material preparation and application. The bubble-assisted wet spinning device comprises a spinning needle, a spinning liquid injection part and a gas injection part. The spinning needle comprises an inner channel and an outer channel. The inner channel is used for inserting a metal wire. The spinning liquid injection part and the gas injection part are communicated with the outer channel through the outer wall of the outer channel. The spinning liquid injection part is used for controlling the advancing speed of the spinning liquid. The gas injection part is used for controlling the gas pressure entering the bubble-assisted wet spinning device, so as to obtain fiber materials with different morphological structures. The bubble-assisted wet spinning device provided by the application can obtain fiber materials with various morphological structures by only changing the pressure or flow of the entering gas, so as to meet different use requirements.

A method and apparatus for fabricating a color-changing thread is described. The method includes providing an aqueous slurry including an encapsulated electrophoretic medium and a binder. The electrophoretic medium includes a first and a second type of electrophoretic particles. The first type of electrophoretic particles have a different charge and color than the second type of electrophoretic particles. The method also includes injecting the aqueous slurry into a fluid reservoir holding an aqueous cross-linker, and forming a hydrogel matrix that entraps the encapsulated electrophoretic medium within a cross-linked binder. The apparatus includes a body housing multiple reservoirs for holding materials used to form color-changing microcapsule threads. Solutions of materials are dispensed simultaneously with a cross-linking agent through a multi-chamber needle form the threads by an ionic cross-linking reaction.

A spinneret for melt-spinning polymer fibers is provided that includes a spinneret body having a plurality of spinneret orifices formed across the thickness of the spinneret body. The plurality of spinneret orifices includes (i) a plurality of multicomponent spinneret orifices each having a first multicomponent opening and a separate second multicomponent opening, and (ii) a plurality of single-component spinneret orifices each having a single single-component opening. A nonwoven fabric having regions of single-component and multicomponent fibers is provided along with a method of forming such nonwoven fabrics using a segmented spinneret.

The invention provides silicon dioxide and aluminum oxide composite fiber sponge and a preparation method thereof, and belongs to the technical field of fiber sponge materials. The preparation method comprises the following steps: respectively preparing an aluminum precursor solution and a silicon precursor solution, mixing the two solutions, preparing a precursor fiber sponge by using a centrifugal spinning technology, and carrying out high-temperature heat treatment to obtain the silicon dioxide and aluminum oxide composite fiber sponge. An aluminum precursor solution and a silicon precursor solution are prepared respectively, a chelating agent is added into the aluminum precursor solution, the PH of the aluminum precursor solution and the PH of the silicon precursor solution are adjusted respectively, the hydrolysis rate of the aluminum precursor solution and the hydrolysis rate of the silicon precursor solution are controlled, the solution which is good in stability and has the spinning possibility is obtained, and then by adjusting and controlling the mixing ratio of the aluminum precursor solution and the silicon precursor solution, the spinning effect is improved. Through centrifugal spinning, the composite fiber sponge which is excellent in mechanical property, resistant to extreme high temperature and good in heat insulation performance can be obtained.

The invention discloses a preparation method of a SnO2 / ZnO nanofiber composite material. The preparation method comprises the following steps: S1, preparing nanofiber-shaped SnO2 by an electrostatic spinning method; s2, the nanofiber-shaped SnO2 and the nanofiber-shaped ZnO are compounded through an electrostatic spinning method, and the SnO2 / ZnO nanofiber composite material is obtained. The gas sensitive sensor prepared from the SnO2 / ZnO nanofiber composite material can realize specific detection of H2 at room temperature, the highest responsivity to 100 ppm H2 at room temperature can reach 237.5, which is 20 times of the responsivity of a pure SnO2 material, the detection limit of the sensor is as low as 100 ppb, and high response and high stability can still be maintained after continuous testing for 30 days.

The invention discloses a microstructure fiber and a preparation device and method.The microstructure fiber comprises a first fiber layer, a second fiber layer and a cavity, and the first fiber layer and the second fiber layer are arranged to be of a folded structure; the first fiber layer and the second fiber layer are both of a wrinkle structure periodically distributed in the axial direction of the microstructure fiber. The cavity is located between the first fiber layer and the second fiber layer and continuously extends in the axial direction of the microstructure fiber, so that the effective specific surface area of the microstructure fiber can be increased; compared with an existing solid wrinkled fiber structure, the continuous hollow cavity is formed in the middle, the cavity can keep the penetrability of a core layer runner all the time, and the interior of the microstructure fiber can be freely filled with functional fluid.

The invention relates to the technical field of material synthesis, in particular to carbon-silicon carbide nanofiber aerogel with a 3D core-shell structure and a preparation method of the carbon-silicon carbide nanofiber aerogel. The preparation method provided by the invention comprises the following steps: (1) preparing a silicon carbide precursor spinning solution and a carbon precursor spinning solution, wherein the conductivity of the silicon carbide precursor spinning solution and the conductivity of the carbon precursor spinning solution are respectively and independently 10-100 [mu] S / cm; (2) the carbon precursor spinning is used as a core layer spinning solution, the silicon carbide precursor spinning solution is used as a shell layer spinning solution, coaxial electrostatic spinning is carried out, precursor nanofiber aerogel is obtained, and the environment humidity of coaxial electrostatic spinning is 5-60%; and (3) sequentially carrying out drying, thermocuring and thermal decomposition on the precursor nanofiber aerogel to obtain the carbon-coated silicon carbide nanofiber aerogel with the 3D core-shell structure. According to the method, the 3D core-shell structure carbon-coated silicon carbide nanofiber aerogel is prepared through the electrostatic spinning method, the process is simple, and the method is suitable for industrial application.

The invention relates to a continuous biodegradable tubular reactor whose wall comprises at least one cylindrical layer based on a polyanionic compound chelated by at least one divalent cation and whose central space comprises a crosslinkable fluid free of polyanionic compound.

The present invention belongs to the technical field of ceramic fibers, and discloses a heat-insulating and noise-reducing ceramic composite fiber modified with hollow silica microspheres and a preparation method thereof. The preparation includes: preparing ceramic fibers through an electrospinning process; preparing an impregnation solution of hollow silica microspheres; vacuum-impregnating the prepared ceramic fibers in the prepared impregnation solution of hollow silica microspheres, and then performing freeze-drying to obtain a heat-insulating and noise-reducing ceramic composite fiber with a three-dimensional network structure similar to a grape bunch. The preparation process of the present invention is simple and rapid. In addition, due to the modification of the fiber surface by hollow silica microspheres, the optimization of the pore structure, and the synergistic effect of material vibration, the heat-insulating and noise-reducing ceramic composite fiber has excellent sound absorption performance and medium-high temperature heat insulation performance.

To provide a conjugate fiber which can function as a piezoelectric material and is improved in strength as compared with a conventional PZT fiber.SOLUTION: There is provided a conjugate fiber composed of at least a metal sintered material and a ceramic sintered material, in which the metal sintered material and the ceramic sintered material are adjacent to each other in the conjugate fiber to form a fiber.SELECTED DRAWING: None

The present invention is directed to electrochromic, supercapacitor yarns and the related fabrics. An electrochromic yarn formed by two interwind threads has been invented. The yarn is electrically isolated by a transparent, uncolored polymer. Each thread is the superposition of three concentric layers. The most internal one, the core, has the function of support and / or conductive layer, the second one is the electrochromic layer containing conductive nanoparticles, the third layer is a polymer dielectric blend. The yarns described above allows to generate electrochromic fabrics in which the colorour can be varied by the application of small electric voltages fed by a battery with variable power supply controlled by a microprocessor connected to a smartphone via Bluetooth technology. A specific application on the smartphone allows to change the voltage supply to the fabrics, in order to get the desired chromatic change.

The invention belongs to the technical field of battery materials, and particularly relates to a nanofiber-coated lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The invention provides a preparation method of a coated nanofiber lithium-rich manganese-based positive electrode material, which comprises the following steps: (1) mixing a first high-molecular polymer, a lithium-rich manganese-based precursor, a lithium salt and a first solvent to prepare an inner-layer spinning solution; (2) mixing a second high-molecular polymer, a solid electrolyte and a second solvent to prepare an outer-layer spinning solution; (3) performing coaxial electrostatic spinning and sintering by taking the inner-layer spinning solution as an inner layer and the outer-layer spinning solution as an outer layer; the sintering atmosphere comprises argon and oxygen, and the volume ratio of the argon to the oxygen is (2-5): 1; the first high-molecular polymer is different from the second high-molecular polymer. The battery prepared from the nanofiber-coated lithium-rich manganese-based positive electrode material prepared by the invention has excellent first effect, specific capacity, rate capability and cycle performance.

The invention discloses a three-dimensional porous SERS (Surface Enhanced Raman Scattering) substrate based on MXene / GO non-woven fabric loaded AgNPs and a preparation method, and relates to the technical field of functional materials. The method comprises the following steps: respectively preparing a single-layer GO colloidal solution and an MXene colloidal solution; the preparation method comprises the following steps: uniformly mixing a single-layer GO colloidal solution and an MXene colloidal solution to prepare a spinning solution, sequentially carrying out continuous wet spinning and coagulating bath ion exchange curing on the spinning solution to obtain MXene / GO composite fibers, and sequentially carrying out fiber shearing, vacuum-assisted suction filtration, vacuum heat treatment and freeze drying to obtain the MXene / GO non-woven fabric with a three-dimensional structure, the MXene / GO non-woven fabric is soaked in a silver nitrate solution, and the three-dimensional porous SERS substrate based on the MXene / GO non-woven fabric loaded with the AgNPs is obtained. The three-dimensional SERS substrate with flexibility, high porosity and high detection sensitivity is obtained by constructing the three-dimensional porous composite carrier and carrying AgNPs through in-situ reduction, and the three-dimensional SERS substrate is suitable for detection of trace substances such as biomolecules, organic pollutants and harmful additives.

The disclosed embodiments provide a smart garment on which designs can be altered in color, pattern, text, etc. The smart garment includes: a first material including a first electrode and a second electrode; a second material including a third electrode and a fourth electrode; and a connection module including: a first grounding terminal configured to ground one of the first and second electrodes in response to a signal sent by a user terminal; a first signal terminal applying a voltage to the other of the first and second electrodes; a second grounding terminal configured to ground one of the third and fourth electrodes; and a second signal terminal applying a voltage to the other of the third and fourth electrodes.

The invention provides a preparation method of a structural color polymer dispersion liquid, which comprises the following steps: mixing a colloid emulsion with a polysaccharide or organic polymer solution, adding a black nano material to obtain the structural color polymer dispersion liquid, and cross-linking the dispersion liquid to obtain structural color fibers or hydrogel. In the invention, by taking sodium alginate as an example, a sodium alginate solution and a colloid emulsion are simply mixed and then injected into a calcium chloride coagulating bath, the structural color sodium alginate fiber can be prepared, and the fiber is expected to be applied to spinning. The color of the fiber can be changed in a visible light range by changing the size of colloid particles. The structural color dispersion liquid is used as ink, and two-dimensional and three-dimensional hydrogel models with structural colors can be printed through coaxial printing. In addition, the dispersion liquid can also be used as a coating in a post-crosslinking manner, and can be coated on a plane and a three-dimensional shape. The structural color polymer dispersion liquid has wide development prospects in the fields of structural color fibers, hydrogel, 3D printing and the like.