298 results about "Nanofiber composites" patented technology

The present invention proposes a nanofiber composite vehicle air filter paper with a gradient structure and a preparation method thereof, which is used to solve the technical problems of poor bonding strength between nanofibers and substrates and low filtration efficiency in nanofiber filter materials. The present invention uses a preparation process combining electrostatic spinning and electrostatic spraying to prepare a nanofiber composite vehicle air filter paper, which includes an ultrafine nanofiber mesh layer, a nanofiber layer and a filter paper layer arranged in sequence. The present invention has a good effect on PM under industrial standard wind speed conditions. 0.3 The initial filtration efficiency of particulate matter can reach 99.9%, reaching the H12 standard for air filtration materials. More importantly, in the self-cleaning backflush test, after 10,000 backflush tests, the PM 0.3 The filtration efficiency can still be maintained above 90%. This provides a new strategy for high-performance nanofiber filtration materials, which is of great significance to the high-tech, high-quality, green and sustainable development of nonwoven materials and filtration materials.

The invention discloses a C5F10O mixed gas decomposition component adsorption material as well as a preparation method and application thereof. The adsorption material is a metal organic framework / nanofiber composite membrane which is prepared by uniformly dispersing a metal organic framework material on a nanofiber membrane obtained by an electrostatic spinning technology through a spraying doping method and is used for adsorbing decomposition components of C5F10O mixed gas. According to the adsorption material provided by the invention, through mutual cooperation of the metal organic framework material and the porous nanofiber membrane base material, a formed composite membrane has a larger specific surface area and more metal active sites, adsorption of gas molecules is promoted, permeation and diffusion of the gas molecules are also facilitated, and the adsorption efficiency is improved. Therefore, the gas sensitivity and the adsorption effect of the adsorption material are remarkably improved.

The invention discloses a preparation method of a cellulose acetate / thermoplastic polyurethane / polypyrrole composite conductive nanofiber aerogel composite pressure sensing material. The preparation method comprises the following steps: (1) preparing a cellulose acetate and thermoplastic polyurethane spinning solution; (2) preparing a cellulose acetate / thermoplastic polyurethane composite nanofiber membrane; (3) preparing cellulose acetate / thermoplastic polyurethane short nano dispersion liquid; (4) preparing a cellulose acetate / thermoplastic polyurethane / polypyrrole polymerization solution; and (5) preparing the cellulose acetate / thermoplastic polyurethane / polypyrrole composite conductive nanofiber aerogel. According to the preparation method, a high-temperature thermal annealing process is not needed, and the prepared nanofiber composite aerogel has high conductivity, ultralow volume density, high compression deformation performance and high pressure resistance sensing sensitivity.

The invention discloses a high-entropy alloy silicon carbide nanofiber composite material and a preparation method and application thereof, a high-entropy alloy is loaded on silicon carbide nanofibers, compared with a carbon fiber material carrier, SiC fibers can form a compact SiO2 protective layer in a high-temperature aerobic environment, further oxidation failure of the internal structure can be prevented, and the high-entropy alloy silicon carbide nanofiber composite material is prepared. And meanwhile, SiC also has relatively high high-temperature stability and weather resistance, so that the high-entropy alloy silicon carbide nanofiber composite material can stably work in an extreme high-temperature oxidation environment (such as a spacecraft thermal protection system and an engine tail gas pipeline) of over 1000 DEG C, and perfectly adapts to a high-temperature wave-absorbing scene.

The invention discloses a preparation method and application of three-dimensional intercalation multidirectional conductive MXene-based aerogel, and relates to the technical field of advanced electrochemical energy storage materials and devices. According to the MXene / conductive polymer and nanofiber composite aerogel developed by the invention, the two-dimensional conductive material, the pseudocapacitance polymer and the high-performance nanofiber are integrated in a three-in-one manner, so that collaborative optimization of conductivity, the number of active sites and structural stability is realized, and inherent defects of a single-component material are fundamentally avoided; and a universal solution is provided for solving the industrial problem of unbalanced performance of the electrode material.

The invention discloses nano ettringite particle reinforced aramid nanofiber aerogel as well as a preparation method and application thereof, and belongs to the technical field of aerogel. The preparation method provided by the invention comprises the following steps: dissolving a calcium source, an aluminum source and sulfate in water, adding a first surfactant, adjusting the pH value to 9-12, stirring for reaction, and after the reaction is finished, washing a solid product to be neutral to obtain nano ettringite particles; uniformly stirring and mixing the nano ettringite particles, para-aramid nanofibers, a second surfactant and a cross-linking agent in water to obtain an ettringite / aramid nanofiber dispersion liquid; the ettringite / aramid nanofiber dispersion liquid is sequentially subjected to concentration, directional freezing and freeze drying, and the ettringite / aramid nanofiber composite material is obtained. The preparation method disclosed by the invention is simple, the raw materials are easy to obtain, and the obtained nano ettringite particle reinforced aramid nanofiber aerogel has relatively high mechanical strength and thermal stability.

The invention belongs to the related technical field of flexible electrodes, and discloses a preparation method, a product and application of a high-temperature-resistant flexible metallized ceramic nanofiber composite electrode. The method comprises the following steps: carrying out electrostatic spinning on electrostatic spinning sol doped with an organic polymer to obtain a precursor of a flexible ceramic nanofiber membrane; carrying out primary high-temperature calcination on the precursor to remove the doped organic polymer so as to obtain a flexible ceramic nanofiber membrane; growing and coating a metal conductive layer on the surface of the flexible ceramic nanofiber membrane to obtain an electrode precursor; and carrying out secondary high-temperature calcination on the electrode precursor to obtain the required composite electrode. The invention also discloses a product obtained by the preparation method and application. According to the invention, the problem that the flexible sensor is not resistant to high temperature is solved.

The invention belongs to the field of battery diaphragms, and particularly provides a preparation method of a solid electrolyte composite material, which comprises the following steps: (S1) mixing a polymer, a plasticizer and a lithium salt, adding into a second solvent, dissolving and stirring to obtain an electrostatic spinning precursor solution; (S2) depositing the electrostatic spinning precursor solution on the surface of a receiver through electrostatic spinning to obtain a fiber membrane, and separating the fiber membrane from the receiver; and (S3) soaking the fiber membrane in a dispersion liquid, and performing dispersion treatment to obtain the nanofiber composite material, specifically, a battery prepared from the solid electrolyte composite material provided by the invention has excellent electrochemical performance, can still maintain a high capacity retention ratio after multiple cycles, has excellent rate capability, and can be applied to the field of lithium ion batteries, such as lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries and lithium ion batteries. And the long-term stability and safety of the operation of the battery can be ensured.

The present invention relates to the technical field of air purification, and particularly provides a nanofiber composite air purification filter material and a preparation method therefor. The nanofiber composite air purification filter material comprises a composite structure consisting of four layers arranged from top to bottom, which are respectively a non-woven fabric, a nanofiber membrane layer, a modified melt-blown non-woven fabric and a spunbond non-woven fabric; the non-woven fabric is PET needle-punched non-woven fabric; in parts by weight, the raw materials for preparing the nanofiber membrane layer comprise: 10-20 parts of polylactic acid, 3-5 parts of a reinforcing agent, 2-4 parts of modified nanoparticles and 100-150 parts of a solvent; and the spunbond non-woven fabric is made of PET or PP. The nanofiber composite air purification filter material provided by the present invention has air-permeability, radiation resistance, and antibacterial properties, can be widely applied in the field of air purification filter materials, and has considerable commercial application value.

The invention provides a preparation method of a carbon / magnetic metal / aramid nanofiber composite aerogel wave-absorbing material, and belongs to the field of wave-absorbing material preparation, and the preparation method comprises the following steps: (1) respectively preparing a polyvinyl alcohol solution, an aramid nanofiber solution, a polyphenol solution and a magnetic metal salt solution; (2) sequentially adding the aramid nanofiber solution, the polyphenol solution and the magnetic metal salt solution into the polyvinyl alcohol solution, and stirring at room temperature to uniformly disperse the mixed solution; and (3) pouring the uniformly dispersed solution into a mold for freezing and freeze-drying. And (4) finally, carbonizing the dried sample in an inert atmosphere to obtain the carbon / magnetic metal / aramid nanofiber composite aerogel. The method is easy to operate and environmentally friendly, and the prepared carbon / magnetic metal / aramid nanofiber composite aerogel has excellent wave absorbing performance and mechanical performance.

The invention belongs to the field of nanofiber composite fabric preparation, and provides a nanofiber high-moisture-permeability waterproof fabric with multi-stage communicated pore canals and a preparation method thereof.The fabric body comprises an outer layer, a middle layer and an inner layer, the outer layer is a pure polyester waterproof fabric subjected to waterproof finishing, the middle layer is a nanofiber membrane with the multi-stage communicated pore canals, and the inner layer is a nano-fiber membrane with the multi-stage communicated pore canals; the inner layer is a pure polyester fabric; the inner side of the outer-layer pure polyester waterproof fabric is attached to the hydrophobic polyvinyl alcohol nanofiber membrane of the nanofiber membrane with the multi-stage communicated pore channels in the middle layer through hot melt adhesive compounding, and the inner-layer pure polyester fabric is attached to the hydrophilic polyurethane nanofiber membrane of the nanofiber membrane with the multi-stage communicated pore channels in the middle layer through hot melt adhesive compounding. The middle layer of the nanofiber membrane is formed by sequentially overlapping multiple stages of nanofiber membrane layers, each stage of nanofiber membrane layer is provided with two layers of nanofiber membranes with different fiber diameters, one layer is a hydrophilic polyurethane nanofiber membrane, and the other layer is a hydrophobic polyvinyl alcohol nanofiber membrane; nanofibers of two membranes among the multistage nanofiber membrane layers and in the membrane layers are in cross lap joint to form a three-dimensional structure with multistage communicated pore channels, and the pore diameter is gradually reduced from the hydrophilic polyurethane nanofiber membrane to the hydrophobic polyvinyl alcohol nanofiber membrane. The moisture permeability is higher than 15000g / (m < 2 >. 24h), and the hydrostatic pressure is higher than 60kPa.

The invention belongs to the technical field of ocean engineering metal corrosion prevention, and particularly relates to a shape memory super-hydrophobic anti-corrosion coating for ocean engineering metal and a preparation method and application of the shape memory super-hydrophobic anti-corrosion coating. The preparation method of the shape memory super-hydrophobic anticorrosive coating for the maritime work metal comprises the following steps: (1) preparing a bisphenol A resin coating; (2) preparing a nanofiber composite coating; and (3) preparing the shape memory super-hydrophobic anticorrosive coating. The preparation method of the shape memory super-hydrophobic anti-corrosion coating for the maritime work metal is simple in process and low in cost, and the prepared shape memory super-hydrophobic anti-corrosion coating for the maritime work metal further has multiple excellent performance such as high impedance, wear resistance, stripping resistance and self-healing performance, is outstanding in durability and has good application prospects. And the method has a huge application prospect in practical application aspects such as marine corrosion protection and the like.

The invention discloses a high-temperature-resistant, heat-insulating and flame-retardant poly (p-phenylene terephthamide) nanofiber composite aerogel as well as a preparation method and application thereof. The composite aerogel is prepared by slowly releasing proton to induce gel through a two-step sol-gel method. Firstly, carboxyl on a PAA molecular chain is introduced to interact with deprotonated amido in an ANF molecular chain, so that a part of a hydrogen bond system is recovered, ANF pre-gel is achieved, then Ti2CCl2 is dispersed into the ANF pre-gel system, the gelation process is further completed through protonic acid, and the ANF / Ti2CCl2 / ANF composite material is obtained. The composite aerogel is obtained through an improved directional freeze-drying technology and a solvent replacement method. The prepared composite aerogel combines the high thermal stability of Ti2CCl2 and the excellent mechanical property of ANF, has excellent flame retardance, high temperature resistance and heat shielding effectiveness, has wide application prospects in the fields of electronic heat dissipation, building energy efficiency, solar energy utilization and the like, and can meet the ever-increasing requirements for efficient thermal regulation and thermal protection.

The invention provides a Kevlar nanofiber composite membrane and a preparation method thereof, and relates to the field of nanofiber composite membrane preparation. The method comprises the following steps: respectively preparing a Kevlar nanofiber dispersion liquid and PVA-co-PE nanofibers, diluting the Kevlar nanofiber dispersion liquid to obtain a Kevlar nanofiber hydrogel, mixing the Kevlar nanofiber hydrogel with the PVA-co-PE nanofibers, adding a mixed solution of water and isopropanol and a cross-linking agent, and carrying out stirring, cross-linking, suction filtration and hot pressing to obtain the Kevlar nanofiber composite membrane. The cross section of the composite film is of a compactly stacked layered embedded structure, so that the composite film has excellent mechanical strength and durability, can effectively resist external stress, and avoids mechanical damage. In addition, due to the layered structure, the composite film has good machinability, processing operations such as cutting, coating and stacking can be conveniently carried out in practical application, and various industrial and engineering application requirements can be met. The preparation method provided by the invention is simple and convenient to operate, economical and efficient, has high reproducibility and is easy to realize industrialization.

The invention relates to a preparation method and application of a high-performance lithium-sulfur battery positive electrode composite electrode material S / CuCo2S4 / CNTs, MWCNTs are uniformly loaded on a nanofiber skeleton through electrostatic spinning, Cu and Co bimetals are doped in combination with a hydrothermal method to prepare the composite electrode material S / CuCo2S4 / CNTs, a one-dimensional carbon material is assembled through electrostatic spinning, heteroatoms are loaded in a hydrothermal mode, the structural stability and electrochemical performance of the MWCNTs are enhanced, and the composite electrode material S / CuCo2S4 / CNTs is prepared. Meanwhile, the ion / electron conductivity is further enhanced by utilizing the effect of sulfur modification, and the method is used for a Li-S battery sulfur-loaded material and improving the electrochemical performance of a battery, and comprises the following steps: 1, preparing a precursor solution; 2, preparing an MWCNTs / PAN (multi-walled carbon nanotubes / polyacrylonitrile) nanofiber solution; 3, carrying out electrostatic spinning on the PAN / MWCNTs nanofiber membrane; 4, preparing an S / CuCo2S4 / CNTs nanofiber composite material; and 5, preparing the composite electrode material S / CuCo2S4 / CNTs. The method is scientific, reasonable and easy to operate, the ternary composite material of the carbon nano tube and the bimetallic sulfide is prepared through mutually enhanced or complementary excellent electrochemical performance, and remarkable economic and social benefits are achieved.

The invention relates to a covalent organic framework modified cellulose nanofiber composite diaphragm which is characterized in that cellulose nanofiber is used as a matrix, an amide type or amine type covalent organic framework layer is grown on the surface in situ, the loading capacity of a covalent organic framework is regulated and controlled, and a hierarchical pore structure with gradient pore diameter is constructed; the preparation method comprises the following steps: synthesizing a covalent organic framework precursor bonded with an imine bond on the surface of cellulose nanofiber in situ by a one-pot method under an acidic mixed solution and a heating condition, and regulating and synchronously reducing to convert into an amine type covalent organic framework; or after the imine bond bonded covalent organic framework is synthesized in two stages, the imine bond bonded covalent organic framework is selectively converted into an amide type covalent organic framework through oxidation modification; the obtained cellulose nanofiber compound coated with the covalent organic framework is subjected to the processes of film forming, solvent replacement, supercritical drying and the like, and the composite diaphragm is obtained; the diaphragm has excellent electrolyte wettability, high liquid absorption rate, good ionic conductivity and thermal stability, and can promote uniform transmission of lithium ions and inhibit growth of lithium dendrites.

The invention discloses a high polymer / nanofiber composite material with high mechanical property and high weather resistance as well as a preparation method and application thereof, and belongs to the technical field of polymer / nanofiber composite materials. According to the invention, polyether polyol participates in a prepolymerization reaction and is used for preparing a high-molecular polymer from modified nanofibers, and in the reaction process of a curing agent and isocyanate, the modified nanofibers and organic silicon are used as reinforcing phases to be added into the high-molecular polymer; the mechanical property, the weather resistance, the hydrophobic ice resistance, the chemical corrosion resistance and the wear resistance of the high-molecular polymer material are improved. The high polymer / nanofiber composite material with high mechanical property and high weather resistance provided by the invention is suitable for rain erosion protection of wind power blades. The preparation process is simple and efficient, the tensile strength, the elongation at break and the impact strength of the prepared high polymer / nanofiber composite material are remarkably enhanced, and the high polymer / nanofiber composite material is environment-friendly.

The invention belongs to the technical field of preparation of composite membranes, and discloses a preparation method of a multipurpose nano-material composite membrane, which comprises the following steps: firstly, carrying out preliminary grafting modification on cellulose nanofibers by using a benzophenone derivative to improve the dispersity, and then introducing a preset functional group to carry out deep modification to obtain a modified cellulose nanofiber composite membrane; the mass ratio of the cellulose nanofiber to the benzophenone derivative is (1: 0.05)-(1: 0.2); according to the invention, the dispersity of the nano material and the grafting efficiency of the functional group are effectively improved by finely regulating and controlling the modification process of the nano material, so that the composite film further enhances the multiple functional characteristics of antibacterial property, antifouling property, ultraviolet shielding property and the like on the basis of keeping the original excellent properties; and meanwhile, the construction of the functional gradient ensures that the composite film can exert the optimal performance in different application scenes, interface defects are not easily generated among the functional layers, and the overall performance is not influenced.

The invention discloses a preparation method and application of a manganese fluoride / carbon nanofiber composite material. The method comprises the following steps: dissolving metal salt and a fluorine-containing high polymer material in an organic solvent to obtain a precursor solution; performing electrostatic spinning on the precursor solution to obtain nanofibers, and drying to remove the solvent; and calcining the nanofiber in an inert atmosphere, and fluorinating and carbonizing at the same time. The method disclosed by the invention is simple in process, the manganese fluoride / carbon nanofiber composite materials with different particle sizes can be prepared by adjusting the concentration of a manganese source and the pyrolysis temperature, and the prepared material has excellent electrochemical performance and is a promising negative electrode material for the potassium ion battery.

The invention relates to the technical field of biomedicine, and provides an endometrial repair stent and a preparation method thereof.The endometrial repair stent is prepared by taking a flaky nanofiber composite membrane as a substrate, combining the flaky nanofiber composite membrane with modified hyaluronic acid, then conducting dynamic crosslinking with carboxymethyl chitosan and then conducting compounding with poly N-isopropylacrylamide; the mass ratio of the modified hyaluronic acid to the carboxymethyl chitosan to the poly (N-isopropylacrylamide) is (1-9): (1-9): (1-90); the thickness of the nanofiber composite membrane is 0.1-0.4 mm, and the nanofiber composite membrane can be applied to treatment of intrauterine adhesion. According to the endometrial repair stent, the nanofiber composite membrane and the temperature-sensitive hydrogel are combined, a uterine cavity is fully paved by utilizing the fluidity of the hydrogel, and the three-dimensional structure of the nanofiber can be used for orderly inducing a wound surface, so that the adhesion and proliferation of cells are facilitated, scar formation is reduced, the repair effect is ensured, and regeneration is promoted. The two parts are combined, so that the plasticity of the whole structure is enhanced, the supporting performance is improved, the indwelling time in the uterine cavity is long, and the double effects of repairing and isolating are fully achieved.

This invention provides an in-situ polymerized yarn and its preparation method, relating to the field of yarn textile technology. The preparation method of this in-situ polymerized yarn includes the following steps: S1. Mixing a polymer, solvent colorant, and complexing agent in a specific ratio to obtain a spinning solution; S2. Simultaneously performing electrospinning, carding, and embedding to obtain a colored nanofiber / cotton composite sliver; S3. Drawing and spinning the sliver to produce yarn. By using colored nanofibers composited with a cotton web, the finishing process is eliminated to reduce contamination. The selection of polydimethyldiallyl ammonium chloride as a complexing agent in the spinning solution increases the volume occupied by the cross-linked structure formed by the complexing agent and dye, enhancing the cohesion with the polymer and improving its color fastness.

The invention discloses a rare-earth-based soil remediation catalyst as well as a preparation method and application thereof. The catalyst takes a composite oxide of micron-sized aluminum oxide and titanium dioxide as a carrier, a nano-fiber composite oxide of cerium oxide and copper oxide as an active component and a nano-particle composite oxide of iron oxide and manganese dioxide as a cocatalyst; on the basis of the mass of the carrier, the mass percentage of the active component is 5-10%, and the mass percentage of the cocatalyst is 3-6%. The catalyst synthesized through the method has the advantages of being good in soil compatibility, high in catalytic efficiency and the like, and the target of low-energy-consumption remediation of organic pollutant soil can be achieved.

The present invention belongs to the field of preparation of nanofiber composite fabrics. The present invention provides a nanofiber high moisture permeability waterproof fabric with multi-level interconnected channels and a preparation method thereof. The fabric body includes an outer layer, an intermediate layer and an inner layer. The outer layer is a pure polyester waterproof fabric that has been waterproofed, the intermediate layer is a nanofiber membrane with multi-level interconnected channels, and the inner layer is a pure polyester fabric; the inner side of the outer layer of pure polyester waterproof fabric is bonded to the hydrophobic polyvinyl alcohol nanofiber membrane of the intermediate layer of nanofiber membrane with multi-level interconnected channels through hot melt adhesive compounding, and the inner layer of pure polyester fabric is bonded to the hydrophilic polyurethane nanofiber membrane of the intermediate layer of nanofiber membrane with multi-level interconnected channels through hot melt adhesive compounding. The nanofiber membrane with multi-level interconnected pores in the middle layer is composed of multiple nanofiber membrane layers stacked in sequence. Each nanofiber membrane layer has two layers of nanofiber membranes with different fiber diameters, one layer is a hydrophilic polyurethane nanofiber membrane, and the other layer is a hydrophobic polyvinyl alcohol nanofiber membrane. The nanofibers of the two membranes between and within the multi-level nanofiber membrane layers are cross-connected to form a three-dimensional structure with multi-level interconnected pores. The pore size gradually decreases from the hydrophilic polyurethane nanofiber membrane to the hydrophobic polyvinyl alcohol nanofiber membrane. The moisture permeability is higher than 15000g / (m 2 24h), the hydrostatic pressure is higher than 60kPa.

The invention discloses a poly (p-phenylene benzobisoxazole) nanofiber composite hydrogel photo-thermal evaporator and a preparation method and application thereof.The photo-thermal evaporator is composed of a photo-thermal conversion assembly and a heat insulation supporting assembly, and the photo-thermal conversion assembly is made of PBO nanofiber composite hydrogel; the bottom of the photo-thermal conversion assembly is embedded in the heat insulation supporting assembly. The interface water evaporation-oriented PBO nanofiber composite hydrogel is prepared by a simple sol-gel method, and the preparation process is simple. The PBO nanofibers and the polyvinyl alcohol are tightly combined to form an ultra-strong structure evaporator, the wettability of the material is improved due to the addition of the PVA, and the abundant three-dimensional network and porous structure provide guarantee for water transmission. The photo-thermal evaporator can serve as a main assembly of a solar interface water evaporation device, can obtain energy from the environment, has excellent interface water evaporation performance and meanwhile has good mechanical performance and tolerance.

The invention provides a preparation method of a high-sensitivity nanofiber composite slub core-spun yarn strain sensor, and belongs to the field of wearable flexible sensors. Comprising the following steps: S1, dissolving polyurethane in a solvent to prepare a spinning solution, preparing a nanofiber / traction filament composite yarn through an electrically-assisted core spinning technology, and endowing traction filaments with deformation by using a stretching device; s2, the composite yarn in the deformation state is placed in a conductive nanoparticle / polymer dilute solution to be soaked; s3, the impregnated composite yarn is impregnated in water, and a nanoparticle / polymer conductive layer is constructed on the surface of the composite yarn through non-solvent induced phase separation; s4, the stretching device is removed, heat treatment is conducted on the composite yarn, and the nanofiber composite slub core-spun yarn sensor is obtained. The sensor has a radial core-shell structure and an axial concave-convex structure, is high in sensitivity, has a stress detection limit as low as 0.01 N, and also has excellent mechanical properties.

The invention provides a zinc sulfide-porous carbon nanofiber composite membrane, a preparation method thereof, an electrode plate and a lithium ion battery, and relates to the technical field of nanostructure materials and batteries. According to the preparation method of the zinc sulfide-porous carbon nanofiber composite membrane, electrostatic spinning and calcination vulcanization processes are combined, and the zinc sulfide-porous carbon nanofiber composite membrane with a special morphology is prepared. The fiber composite membrane has a unique structure that zinc sulfide is uniformly distributed in the lotus-root-like porous carbon nanofibers, and the composite structure provides a good electron transport network and improves the conductivity of the material; due to the coating and confinement effects of the porous carbon nanofibers on the zinc sulfide, the volume expansion effect of the zinc sulfide in the circulation process can be effectively inhibited, the defects of poor conductivity, large volume expansion and the like of the zinc sulfide are overcome, and the circulation stability of the composite membrane is improved. As the fiber composite membrane has mechanical flexibility and self-supporting property, the fiber composite membrane can be directly used as an electrode plate, and the preparation process of the electrode plate is greatly simplified.

The invention provides a LiCl / cellulose nanofiber composite membrane, a preparation method thereof and an ionic conductive humidity sensor, and belongs to the technical field of biomass nanomaterials. According to the method, cellulose pulp is used as a raw material, cellulose is dissolved in an N, N-dimethylacetamide (DMAc) / lithium chloride (LiCl) solvent system, DMAc is volatilized into air in the electrostatic spinning process, and LiCl is reserved in cellulose nanofibers. In this way, LiCl / cellulose nanofiber films with different LiCl contents can be prepared. The prepared humidity sensor has the advantages of higher sensitivity, wider detection range and short response / recovery time, and can be used in the fields of human respiration monitoring, non-contact humidity testing and the like. The invention provides a new thought for constructing a novel cellulose-based humidity sensor.

The invention belongs to the technical field of carbon nanofiber material manufacturing, and particularly relates to a preparation method of acid-modified multilayer graphene doped polyacrylonitrile-based composite active carbon nanofibers. The method comprises the following steps: chemically compounding modified multilayer graphene and polyacrylonitrile; preparing a nanofiber composite film by adopting an electrostatic spinning technology; then carrying out pre-oxidation and carbonization treatment on the carbon nanofiber composite film; and finally, carrying out acid leaching treatment on the carbon nanofibers to obtain the acid-modified multilayer graphene doped polyacrylonitrile-based composite active carbon nanofibers. A modification method is adopted, the modification effect is good, the surface area of the fiber is remarkably increased, more polar adsorption sites are provided, an important role is played in adsorption of isopropanol, meanwhile, the binding force between the materials is higher, and the applicability of the composite activated carbon nanofiber in the market is improved.

The invention discloses a preparation method of a functionalized SiO2 / aluminum silicate nanofiber composite membrane, which comprises the following steps: respectively modifying aluminum silicate nanofibers and SiO2 nanoparticles by using an amino silane coupling agent to respectively obtain aminated aluminum silicate nanofibers and aminated SiO2 nanoparticles; grafting succinyl chloride on the surfaces of the aluminum silicate nanofibers and the SiO2 nanoparticles to obtain acyl chloride aluminum silicate nanofibers and acyl chloride SiO2 nanoparticles; the preparation method comprises the following steps: modifying ethylenediamine tetraacetic acid dianhydride by using 2-amino-1, 3-propylene glycol to obtain an intermediate, carrying out a cross-linking polymerization reaction between acyl chloride aluminum silicate nano-fibers and acyl chloride SiO2 nano-particles by using the intermediate as a cross-linking agent and acyl chloride as a polymerization site, and carrying out suction filtration to form a membrane, so as to obtain the film. The gram weight of the functionalized SiO2 / aluminum silicate nanofiber composite membrane is not greater than 15g / m < 2 >. According to the invention, high-efficiency adsorption of heavy metals is realized, and meanwhile, the problem that a nano-powder material is difficult to recycle is solved.

The invention belongs to the technical field of composite film materials, and particularly relates to a boron nitride nanosheet-aramid nanofiber composite film and a preparation method thereof.The preparation method comprises the steps that calcium chloride is dissolved in a sodium alginate aqueous solution, and a Ca < 2 + > / SA cross-linking solution is obtained; adding hexagonal boron nitride into the Ca < 2 + > / SA cross-linking solution, and magnetically stirring to realize pre-infiltration so as to obtain a pre-infiltrated SA / BNNS solution; carrying out ball milling and washing on the pre-infiltrated SA / BNNS solution to obtain a BNNS / water suspension; mixing the BNNS / water suspension with the ANF / DMSO dispersion liquid to obtain a BNNS / ANF mixed solution; carrying out vacuum filtration, drying and hot pressing treatment on the BNNS / ANF mixed solution to obtain a boron nitride nanosheet-aramid nanofiber composite film; by improving interface phonon scattering between BNNS, the interface density of the material is lower, the contact area of the interface is larger, and therefore the heat conductivity of the composite film is improved.