130 results about "Coaxial electrospinning" patented technology

The invention relates to a device and a method for preparing nanofiber core-spun yarn through batch coaxial electrostatic spinning. The device comprises a needleless dish-shaped spray head, an air blowing auxiliary device, a liquid supply device, an annular twisting device, a high-pressure generator, a negative-pressure air suction device, a winding device and an unwinding device. The core yarn penetrates through the axis of the needleless dish-shaped nozzle, the nanofiber generated by the needleless dish-shaped nozzle coaxially wraps the surface of the core yarn through the whole spinning device, and batch preparation can be achieved. The device is further provided with an air blowing auxiliary device and a negative pressure air suction device, under the air blowing effect of an air blowing nozzle and the adsorption effect of a negative pressure air suction shell, airflow force can be generated to promote jet flow to be further stretched in a straightened mode, under the common influence of electric field force and the airflow force, the jet flow is fully stretched, bending is reduced, and the service life of the jet flow is prolonged. Therefore, the nanofiber bundles can continuously cover the surface of the core yarn in a high-orientation state under the traction of the annular twisting device, and the continuous nanofiber core-spun yarn is formed.

The invention discloses a preparation method and application of a plasma catalyst, and belongs to the field of environmental catalytic materials. Aiming at the problems of insufficient micro discharge quantity, low energy efficiency, easy catalyst deactivation and the like in the existing plasma catalysis technology, the invention provides the hollow fibrous perovskite type titanate composite catalyst. According to the catalyst, a carrier is prepared by combining a coaxial electrostatic spinning technology with a gradient calcination process, and then a transition metal active component is loaded, so that the plasma discharge intensity and the pollutant degradation efficiency are remarkably enhanced.

The invention relates to a halogen-free flame-retardant flexible bending-resistant low-voltage power cable and a manufacturing method thereof. An insulating layer of the cable is made of a core-shell type nano composite phase change material, a core layer is made of a polyethylene glycol / paraffin phase change material, a shell layer is made of polyurethane or modified polyamide nano fibers and nano SiO2 particles, and the cable is prepared by adopting a coaxial electrostatic spinning technology. According to the structure, stress can be effectively dispersed when the cable is bent, crack propagation is reduced, the temperature is adjusted through the phase change material, and local overheating is prevented. The three-dimensional network structure enhances the bending resistance of the cable, the bending life is prolonged by 40%-60%, and the halogen-free flame retardant performance is ensured at the same time. The technology realizes collaborative optimization of temperature adjustment, stress buffering and bending resistance, and is suitable for power cables with high requirements.

According to the invention, a bicontinuous phase conductive core-shell nanofiber membrane is applied to construction of a flexible neural electrode and a neural conduit, firstly, a bicontinuous phase conductive polymer system is constructed, and the system realizes a three-dimensional network in which an electric phase and a mechanical phase are respectively continuous, interpenetrating but independent; and the long-term technical problems of conductive component agglomeration, conductive path interruption and the like are effectively solved. And preparing the conductive nanofiber scaffold with a core-shell structure by taking a high-molecular polymer as a core layer material and a bicontinuous-phase conductive polymer system as a shell layer material through a coaxial electrostatic spinning method. The construction mode effectively establishes a stable, continuous and uniform electron conduction path, can realize effective nerve electrical stimulation and high-fidelity electrophysiological signal recording in vivo, and can be used as a nerve conduit to regulate and repair related bio-electricity signals in a nerve repair process, so as to accelerate regeneration and repair of nerves.

The invention discloses a preparation method of a growth factor gradient bionic scaffold for tendon-bone interface regeneration and repair, and belongs to the technical field of biomedical materials. The composite scaffold is constructed by adopting a coaxial electrospinning and self-assembly technology, and is compounded by a core-shell oriented nanofiber layer and a non-oriented nanofiber layer through a gelatin adhesive to respectively simulate tendon phase and bone phase structures of a tendon-bone interface; a shell layer of the tendon-phase-simulated core-shell oriented nanofiber is a PCL layer containing CTGF, a core layer of the tendon-phase-simulated core-shell oriented nanofiber is a PVA layer containing TGF-beta1, and a bone-phase-simulated non-oriented nanofiber layer is a PCL / Gel co-spun layer containing BMP-2 polylactic acid microspheres and nano-hydroxyapatite. The scaffold can realize secondary controlled release of early-stage release of CTGF, slow release of TGF-beta1 in the middle and later periods and continuous release of BMP-2, and cooperates with a fiber orientation structure to induce graded differentiation of mesenchymal stem cells and promote integrated repair of a tendon-bone interface gradient structure, so that the problems of poor healing of a tendon-bone interface and high repeated fracture rate in a traditional repair method are solved, and the scaffold has good application prospects. The important application value is realized in the field of tendon-bone injury treatment in sports medicine.

The invention relates to the technical field of medical protection materials, and discloses an anti-allergy skin-friendly operating kit and a preparation technology, and the composite material of the operating kit comprises the following components by mass: 40-70 parts of cellulose-based non-woven fabric; 1 to 10 parts of polymethacryloyloxyethyl phosphorylcholine which is covalently grafted to the cellulose-based non-woven fabric; 20 to 50 parts of polylactic acid-quaternary ammonium salt copolymer; 5 to 15 parts of a polyurethane hot melt adhesive; the method comprises the following steps: grafting a PMPC molecular brush on the surface of a cellulose-based non-woven fabric to obtain a skin-friendly layer; carrying out coaxial electrostatic spinning and solvent treatment on the polylactic acid-quaternary ammonium salt copolymer to prepare a hollow nanofiber barrier layer; and finally hot-pressing and compounding the two layers through a polyurethane hot-melt adhesive. According to the invention, allergy is solved through surface grafting; the toxicity is avoided by using an intrinsic antibacterial polymer; the hollow fibers and the net film are compounded, so that the contradiction between water resistance and breathability is overcome, and the biological safety and comfort of the material are improved.

The invention discloses a magnesium oxide coaxial electrospun bone biological material tensile strength and elongation detection device, and belongs to the technical field of material detection.The magnesium oxide coaxial electrospun bone biological material tensile strength and elongation detection device comprises a clamping mechanism, loading mechanisms are connected to the two sides of the clamping mechanism, the device further comprises a detection mechanism for detecting the elongation, and the clamping mechanism comprises a first side plate and a second side plate; the lower side of the first side plate is rotationally connected with a guide rod, a guide sleeve is rotationally arranged on the second side plate, and the guide rod is slidably inserted into the guide sleeve; a first bearing plate and a second bearing plate are arranged on the first side plate and the second side plate, a first sliding way and a second sliding way which are symmetrically arranged are arranged on the first side plate and the second side plate correspondingly, a pressing rod is slidably connected into the first sliding way and the second sliding way, a first pressing block is fixedly connected to the lower side of the pressing rod, and a second pressing block is slidably connected to the pressing rod. And the upper end of the pressing rod is connected with a hydraulic driving rod. The device has the advantages of fast clamping and multi-angle composite loading.

The invention belongs to the field of biosensing and microbiological detection, and relates to a staphylococcus aureus rapid counting method based on fluorescence confinement discretization. According to the method, oat bran is used as a natural carbon source, lysozyme active fragments are used as targeting ligands, targeting carbon quantum dots are synthesized through a one-step hydrothermal method, the targeting carbon quantum dots are modified by fluorescent dye SRB to obtain luminescence enhanced carbon quantum dots, and the luminescence enhanced carbon quantum dots can be specifically combined with cell walls of staphylococcus aureus, so that the staphylococcus aureus has stable fluorescence signals. And then, by taking the marked thalli as a core layer and a high-molecular polymer as a shell layer, preparing a core-shell nanofiber membrane by adopting a coaxial electrostatic spinning technology to realize spatial confinement and monomer discretization of the thalli, so that a group fluorescence signal is converted into a single-thalli distinguishable signal, and rapid and sensitive quantitative detection of the staphylococcus aureus is realized. The method is simple, convenient, high in sensitivity, suitable for rapid visualization and quantitative detection of staphylococcus aureus in foods such as dairy products, meat products and beverages, and wide in application prospect.

The invention relates to the field of preparation of mullite materials, in particular to a method for preparing mullite porous hollow microspheres by an electrostatic spinning technology. The method for preparing the mullite porous hollow microspheres by the electrostatic spinning technology comprises the following steps: mixing an inner-layer polymer with a first solvent to obtain an inner-layer polymer solution; mixing the mullite precursor with a second solvent to obtain an outer layer polymer solution; performing electrostatic spinning on the inner-layer polymer solution and the outer-layer polymer solution by adopting a coaxial electrostatic spinning technology to obtain precursor microspheres; carrying out curing heat treatment on the precursor microspheres to obtain cured and crosslinked precursor microspheres; calcining the cured and crosslinked precursor microspheres, so as to obtain mullite porous hollow microspheres; wherein the humidity of the electrostatic spinning is 30-60%. According to the invention, the porous structure and hollow structure combined mullite microspheres are prepared by adopting an electrostatic spinning technology, and a new method is provided for preparation of the porous hollow mullite microspheres.

The invention belongs to the technical field of anticorrosive and antibacterial coatings, and particularly relates to a self-repairing antibacterial anticorrosive coating and a preparation method thereof. The core-shell structure nanofiber membrane with a high polymer material as a shell and a metal corrosion inhibitor as core liquid is prepared by adopting a coaxial electrostatic spinning technology. An epoxy resin coating is sprayed on an iron sheet in advance, the sprayed epoxy resin is subjected to low-temperature pretreatment to be in a semi-solidified state, and a core-shell structure nanofiber membrane is attached to the pretreated epoxy resin coating; and finally, spraying the epoxy resin containing the antibacterial agent and the antibacterial agent ethanol solution on the surface of the fiber membrane again to prepare the composite coating with a sandwich structure. The prepared composite coating has good antibacterial ability, after the iron sheet coating is damaged, the anti-corrosion coating can rapidly release an anti-corrosion healing agent to rapidly repair the damaged part of the coating, and the composite coating has efficient self-repairing anti-corrosion ability and has good application prospects in the anti-corrosion field.

This invention relates to a filter membrane and its preparation method, particularly to a platelet-rich suspension leukocyte-removing filter membrane and its preparation method. The method uses polyethersulfone (PES) material, which has stable mechanical properties, heat resistance, and chemical properties, as the core material, and polylactic acid (PLA) material, which has good biocompatibility and safety, as the outer material. A coaxial electrospinning process is employed to prepare the PES-PLA filter membrane. Furthermore, a vinylpyrrolidone-acrylamide copolymer is grafted onto the surface of the PES-PLA filter membrane. The resulting platelet-rich suspension leukocyte-removing filter membrane has a narrow pore size distribution, high porosity, and good hydrophilicity, biocompatibility, and antibacterial properties. It can effectively filter out leukocytes from platelet suspensions and reduce the risk of bacterial contamination.

The application belongs to the technical field of composite micro / nano fiber materials, and particularly relates to a polyimide and polymer composite micro / nano fiber nonwoven fabric, a preparation method and application thereof. The nonwoven fabric is a three-dimensional porous network composed of composite micro / nano fibers with a skin-core structure; the skin layer material of the composite micro / nano fiber is polyimide, and the core layer material is a polymer; the polymer is at least one of polyacrylonitrile, polyvinylidene fluoride and polyarylene ether. The preparation method is to prepare polyimide spinning solution and polymer spinning solution respectively, then perform coaxial electrospinning, and then perform post-processing. The polyimide and polymer composite micro / nano fiber nonwoven fabric has excellent chemical corrosion resistance, excellent mechanical properties, excellent thermal stability, low cost, uniform material compounding, high porosity and high efficient cyclic adsorption performance, can efficiently remove heavy metal ions and organic dyes in water, and has a wide application prospect in the field of water treatment.

The application provides a fiber weaving structure dielectric film for a high energy density capacitor and a preparation method, and aims at the fact that the dielectric constant and the breakdown strength of a polymer-based dielectric material are difficult to be simultaneously improved, so that the energy density cannot meet the demand of a high power density energy storage capacitor. A polyetherimide / polyvinylidene fluoride-hexafluoropropylene core-shell structure fiber with a core-shell structure is prepared through a coaxial electrospinning technology, a composite film is formed through laminated hot pressing, the weaving structure is adjusted by adjusting the core-shell fiber composition content, the fiber orientation stacking direction and the stacking layer number, the mechanical strength of the film is enhanced, carriers are captured by deep traps, the breakdown strength is significantly improved, the high dielectric constant is maintained by utilizing interface polarization, and the energy density is comprehensively improved.

The invention discloses a temperature response type antibacterial packaging fresh-keeping film as well as a preparation method and application thereof, and belongs to the technical field of fruit packaging fresh-keeping. The preparation method comprises the following steps: mixing polyvinyl alcohol (PVA) and polyvinyl caprolactam (PNVCL), stirring and dissolving to obtain a shell solution; the preparation method comprises the following steps: mixing polylactic acid (PLA) and hexafluoroisopropanol, stirring and dissolving to obtain a PLA solution, adding cinnamon essential oil (CEO), and uniformly stirring to obtain a core layer solution; degassing and standing; and performing coaxial electrostatic spinning on the shell layer solution and the core layer solution to obtain the fresh-keeping film. The fresh-keeping film has good hydrophilicity, antibacterial property and oxidation resistance, can intelligently respond to environment temperature change to realize CEO slow release, can effectively delay softening, decaying and deterioration of the picked waxberries, and remarkably prolongs the fresh-keeping period.

The present application belongs to the field of heterogeneous catalysis and material synthesis, and relates to a hollow ceramic fibrous iron-based catalyst for preparing biofuel from synthesis gas, a preparation method and application thereof. The catalyst is prepared by a coaxial electrospinning process, with polyborosilazane as a shell layer, polymethyl methacrylate, polyvinylpyrrolidone and acetylacetone iron as a core layer, and through spinning, solidification, gradient temperature pyrolysis and reduction steps, a hollow ceramic fibrous iron-based catalyst is prepared. The shell layer of the catalyst is converted into a high-strength and high-temperature stable SiBCN ceramic carrier, the core layer is pyrolyzed to form a hollow cavity and in-situ load high-dispersion iron active species, and the catalyst has good mechanical strength, high hydrothermal stability and excellent catalytic activity. The application of the catalyst in a continuous flow fixed bed reactor for preparing biofuel from synthesis gas is suitable for the synthesis of sustainable aviation fuel and other biofuels.

The present disclosure provides a preparation method of an efficient and stable catalytic membrane based on a multi-scale hollow molecular sieve fiber, and belongs to the technical field of molecular sieve preparation. The preparation method includes the following steps: mixing a silicon source, an aluminum source, water, and an organic template, and stirring; heating, and adding deionized water; conducting a reaction by hydrothermal synthesis; conducting centrifugation on an obtained suspension, loading by mixing an obtained powder free of a mother liquor with an iron source, and washing and drying; dissolving a treated powder in anhydrous ethanol and conducting an ultrasonic treatment; adding a surfactant to an obtained dispersion, stirring, and conducting the ultrasonic treatment; and conducting coaxial electrospinning and calcination in sequence to obtain the membrane based on a hollow molecular sieve fiber.

The invention relates to the technical field of medical instruments, in particular to an internal and external fiber coated intravascular stent as well as a preparation method and application thereof. An inner fiber covering film and an outer fiber covering film with certain functions are respectively prepared by utilizing a coaxial electrostatic spinning technology, and the fiber covering film with a core-shell structure is prepared. The inner-layer fiber covering film takes a degradable polymer as a shell layer preparation raw material, so that the shell layer can be degraded within a certain time, thrombus and inflammation resistance is realized, and endothelialization is promoted; the anti-thrombus substance loaded on the shell layer is used for resisting acute thrombus, and can be used as a protective layer to ensure the activity of the substance for promoting vascular endothelial growth in the core layer, and the load can realize a slow release function, so that the loss of expected functions due to quick release of the load is avoided. The outer fiber membrane takes a degradable polymer as a shell layer preparation raw material, so that the shell layer can be degraded within a certain time, and tissue integration and infection resistance are promoted; antibacterial substances are loaded on the core layer and are slowly released under the wrapping of the shell layer.

The invention discloses a long-acting insect-repelling fiber membrane with a core-shell structure as well as a preparation method and application of the long-acting insect-repelling fiber membrane, and aims to solve the key technical problems of sudden release, short lasting period and poor stress resistance of repellents in field application, slow degradation of existing carriers and the like. The long-acting insect-repelling fiber membrane is prepared through a coaxial electrospinning technology, and a shell layer of the long-acting insect-repelling fiber membrane takes environment-friendly degradable materials including polylactic acid (PLA) and polycaprolactone (PCL) as main carriers and is added with a proper amount of functional auxiliaries; the core layer takes polyethylene oxide (PEO) as a carrier, and the high-concentration repellent is encapsulated in the core layer. The obtained fiber membrane with the core-shell structure has the advantages of long-acting slow release, stress resistance and biodegradability, and can be combined with a mulching film for use to form a physical and chemical barrier, so that efficient prevention and control of pests are realized.

The invention relates to preparation and application of a malignant tumor targeting gambogic acid preparation. An inner core-middle layer-shell three-layer structure is adopted, wherein the inner core is a gambogic acid-black phosphorus quantum dot compound and has chemical treatment and photo-thermal treatment functions; the middle layer is nano vesicles derived from frozen NK92 MI cells and provides natural immune targeting and killing ability; a shell is a hyaluronic acid chelate, and active targeting and pH / photo-thermal response type drug controlled release are achieved. The core of the preparation method is that a coaxial electrojet technology is adopted, three layers of materials are formed in one step, the process is efficient, and the preparation stability is good. The preparation can realize photo-thermal-chemical-immune triple synergistic treatment, has near-infrared fluorescence and photo-acoustic multimode imaging functions, effectively solves the problems of poor targeting property, large toxic and side effects and lack of real-time monitoring of traditional chemotherapy, and shows significant advantages and application potential in precise treatment and diagnosis of solid tumors.

The invention discloses a high-thermal-conductivity polyester-nylon composite filament and a preparation process thereof, and relates to the technical field of polyester-nylon composite filaments, in particular to the high-thermal-conductivity polyester-nylon composite filament and the preparation process thereof, and the preparation process comprises the following steps: S1, blending treated graphene and PET slices in a twin-screw extruder to generate a melt, and compounding the filament through a spinneret plate; s2, carrying out coaxial electrostatic spinning on the treated boron nitride nanotube on the surface of the core layer fiber to form a fluffy nanofiber net with the thickness of 20 microns; s3, mixing PEG4000 with the silicon carbide nanowires, coating with urea resin, and preparing microcapsules with the diameter of 5 microns through an in-situ polymerization method; and S4, dispersing the microcapsules in a waterborne polyurethane adhesive, and coating the surface of the composite fiber with the waterborne polyurethane adhesive through a gravure roller. According to the preparation process, graphene and PET slices are mixed according to the weight ratio of 3.5: 6.5, an efficient axial heat channel is constructed, and the longitudinal heat conduction capacity is remarkably improved.

The application provides coaxial electrospinning polyurethane / graphene conductive fiber, preparation and application, which is prepared by coaxial electrospinning to obtain porous PU / PDA / rGO coaxial nanofiber with polyurethane (PU) as a skin layer and graphene oxide (GO) as a core layer; the reactivity of dopamine (DA) is used to make DA in-situ polymerize during coaxial electrospinning and vacuum drying, simultaneously generate reduced graphene oxide (rGO) and make it adhere to the PU surface, and then improve the excessive aggregation of rGO in the conventional loading process and the falling off in the use process. In order to improve the polymerization rate of DA in N,N-dimethylformamide (DMF), triethylamine is added to capture H + generated by dopamine polymerization and promote dopamine polymerization. The PU / PDA / rGO coaxial nanofiber prepared in the application has the advantages of good rGO dispersity, strong interface adhesion with the skin layer, simple skin layer thickness and pore regulation, good conductive performance and the like, and can be used for the development of flexible pressure sensors.

The invention relates to the technical field of synthetic fibers, and particularly discloses a squalane-containing functional fiber material and a preparation method thereof.The preparation method comprises the steps that firstly, squalane serves as a core material, stearic acid cellulose phosphate serves as a wall material, a squalane microcapsule is synthesized, the microcapsule is added into a lyocell fiber spinning solution to serve as a core layer spinning solution, and the core layer spinning solution is prepared; the preparation method comprises the following steps: adding a carbon nano tube into a polysulfobetaine solution to serve as a sheath spinning solution, spinning a composite fiber which is formed by tightly combining microcapsules and lyocell fibers and is provided with polysulfobetaine on the outer layer by adopting a coaxial electrostatic spinning technology, and the fiber is good in biocompatibility, and has flame retardance, antibacterial property and antistatic property while replenishing water, preserving moisture and moistening skin.

The invention discloses a film-covered balloon double-cavity stomach tube and a preparation method thereof. The stomach tube comprises a double-cavity stomach tube body, a compliance balloon and a drug-loaded fiber film. The double-cavity stomach tube is provided with a main cavity for gastrointestinal drainage and a side cavity for balloon inflation and deflation; the compliance balloon is fixed to the esophageal section and expands and contracts through inflation and deflation of a side cavity. The outer surface of the balloon is coated with the drug-loaded fiber covering film, the drug-loaded fiber covering film is composed of coaxial drug-loaded nanofibers, a sheath layer of the drug-loaded fiber covering film is made of a blend of polylactic acid caprolactone and collagen, and a core layer of the drug-loaded fiber covering film is made of polylactic acid caprolactone dispersed with anti-inflammatory drugs and local anesthetic drugs. According to the preparation method, a drug-loaded fiber covering film is constructed on the surface of the balloon through a coaxial electrostatic spinning technology, drugs (such as dexamethasone and lidocaine) can be encapsulated in a nanofiber core layer, a sheath polymer material is used as a diffusion barrier, burst release of the drugs is effectively prevented, continuous and controllable release of the drugs at the esophageal diseased region is achieved, and the drug delivery effect is improved. The medicine action time is obviously prolonged; the curative effect is improved.

The invention relates to the technical field of biological detection, and provides an integrated gradient spinning fiber membrane for multi-omics analysis and a preparation method of the integrated gradient spinning fiber membrane. According to the fiber membrane, a coaxial electrostatic spinning technology is adopted, and functional zones are continuously formed on a single membrane by controlling the flow velocity of a shell layer (PLGA / chitosan solution) and a core layer (PEO / GPC3 aptamer solution): a nucleic acid enrichment end adsorbs and captures nucleic acid through positive electricity of chitosan, and a protein capture end recognizes a liver cancer marker GPC3 protein through a fixed GPC3 specific nucleic acid aptamer G625. According to the design, the capture environment of nucleic acid and protein is physically isolated, the problems of mutual interference and cross contamination of functional sites in a traditional method are fundamentally solved, and parallel and in-situ capture and enrichment of genomics, transcriptomics and proteomics information in the same trace biological sample are realized. The method is easy and convenient to operate, GPC3 protein is specifically captured and recognized, the nucleic acid enrichment capacity and the cross contamination resistance capacity are high, and a new strategy is provided for early diagnosis and precise typing of liver cancer.

The invention relates to the field of daily chemicals, and discloses a micro-current dry-state soothing anti-allergy mask and a preparation method thereof.The micro-current dry-state soothing anti-allergy mask comprises a soothing anti-allergy functional layer and a friction power generation layer which are attached to each other; the soothing anti-allergy functional layer comprises a skin-core type nanofiber membrane and a conductive pattern; a skin layer of a single fiber in the skin-core nanofiber membrane is water-soluble silk fibroin loaded with sorbitol and essence components, and a core layer is water-soluble silk fibroin loaded with a soothing and anti-allergy plant extract composition; according to the principle of generating electricity through friction, micro-current massage in the mask applying process can be achieved under the condition that external equipment is not needed; the plant extract composition is loaded on the core layer of the nanofiber membrane by virtue of a coaxial electrostatic spinning technology, so that the influence of long-term contact between active ingredients in the plant extract composition and other ingredients in the essence can be avoided, the activity stability of the essence is improved, and the soothing and anti-allergy effects are improved.

The present invention relates to a method of preparing a photocatalyst composite nanofiber using coaxial electrospinning and a photocatalyst composite nanofiber prepared by the same method, and when the photocatalyst composite nanofiber is prepared by such a method, noble metal particles are located on the fiber surface and rGO surrounds the nanofiber, thereby improving photocatalytic performance and reducing costs, and being capable of being applied in various industrial fields for antibacterial treatment and deodorization.

The application belongs to the field of heterogeneous catalysis and material synthesis, and discloses a lotus-shaped ceramic fiber iron-ruthenium-based catalyst for synthesizing biofuel as well as a preparation method and application thereof. The catalyst is prepared by using a coaxial electrospinning process, taking polysilazane, an iron source and a spinning aid as a shell spinning solution, and taking a mixture containing polysilazane, an iron source, a ruthenium source, a pore-forming agent and a spinning aid as a core spinning solution, to obtain a lotus-shaped ceramic fiber precursor containing iron-ruthenium. After the precursor is subjected to stepwise heating and solidification, inert atmosphere pyrolysis and hydrogen reduction, the lotus-shaped ceramic fiber iron-ruthenium-based catalyst is formed. The catalyst has excellent mechanical strength, high hydrothermal stability and good reaction mass transfer performance, and is suitable for preparing biofuel from syngas in a fixed bed reactor.

The application belongs to the technical field of inorganic nonmetallic materials, and particularly relates to a crack-modified hollow carbon nanowire and a preparation method thereof. The preparation method comprises the following steps: mixing and stirring polyacrylonitrile, acetylacetone, dimethylformamide and aluminum oxide to obtain a shell spinning solution; mixing and stirring polystyrene and dimethylformamide to obtain a core spinning solution; performing coaxial electrospinning on the shell spinning solution and the core spinning solution to collect a fiber membrane; sequentially performing pre-oxidation and carbonization on the fiber membrane to obtain a hollow carbon nanowire; and performing hydrothermal reaction on the hollow carbon nanowire in an alkali solution to obtain the crack-modified hollow carbon nanowire. The inner surface of the prepared crack-modified hollow carbon nanowire is exposed, and the crack-modified hollow carbon nanowire can effectively play the advantages of a large specific surface area and a high loading rate, and has a wide application prospect in the fields of wave absorption, catalysis, electrochemical energy storage and the like. The raw materials are easy to obtain, the cost is low, the production equipment is relatively simple, the operation is convenient, and the industrial large-scale production can be easily realized.

The invention relates to the technical field of medical composite materials, in particular to a high-compatibility bioactive glass composite material and a preparation method thereof. The preparation method comprises the following steps: synthesizing Mg / Sr-doped hydroxyapatite nano-powder and Zn / Li-doped bioactive glass microspheres, blending the Mg / Sr-doped hydroxyapatite nano-powder and the Zn / Li-doped bioactive glass microspheres with polycaprolactone, and preparing a stent primary blank with gradient pores which are dense outside and sparse inside through a low-temperature deposition 3D printing technology; and by taking the primary blank as a receiving device and adopting a coaxial electrostatic spinning technology, constructing a core-shell structure nanofiber functional layer loaded with the BMP-2 growth factor on the surface and in internal pores of the primary blank in situ. By regulating and controlling the composition of the bioactive glass and introducing functional metal ions, local alkaline stimulation caused by rapid release of ions after the material is implanted is reduced, and meanwhile, by combining a multi-gradient composite structure design and controllable loading of growth factors, synergistic improvement of biocompatibility, bioactivity and mechanical support performance of the composite material is realized; the bone regeneration can be effectively promoted, the stress damage is reduced, and the method is suitable for bone defect repair.

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.