1385 results about "Nanofibrous membrane" patented technology

The invention relates to the technical field of sewage treatment, in particular to a sewage treatment control process based on dynamic regulation and control of aeration and carbon source addition, which comprises the following steps: acquiring microbial metabolism heat change data in real time; biochemical treatment: monitoring the dielectric constant of a water body and the Reynolds number of sewage flow in real time, and constructing a multi-parameter coupling regulation and control model and dynamically regulating and controlling the aeration rate in combination with microbial metabolism heat change data obtained in the pretreatment step; accurately adding the carbon source according to a calculation result of the carbon source demand prediction model; sewage subjected to biochemical treatment is subjected to ultrafiltration through a nanofiber membrane and then subjected to combined disinfection treatment through ultraviolet rays and ozone, treatment parameters are regulated and controlled in real time according to the membrane flux attenuation trend in the treatment process, and dynamic and accurate control over sewage treatment is achieved. According to the method, the problem of energy consumption waste caused by excessive aeration or low degradation efficiency caused by insufficient aeration in a traditional process is solved, and accurate matching of dissolved oxygen supply and microbial requirements is realized.

The invention belongs to the technical field of biomedical engineering, and particularly relates to a biological rotator cuff patch with a double-gradient structure and a preparation method of the biological rotator cuff patch. The preparation method comprises the following steps: carrying out electrostatic spinning on a spinning solution, controlling the rotating speed of a receiving roller to increase at a constant speed in the electrostatic spinning process, and obtaining a nanofiber membrane after electrostatic spinning; l-polylactic acid and D-polylactic acid are simultaneously dissolved in the spinning solution; the minimum value of the rotating speed of the receiving roller is 100-500 rpm, and the maximum value of the rotating speed of the receiving roller is 3000-4000 rpm. The finally prepared biological rotator cuff patch with the double-gradient structure presents an orientation degree gradient and a piezoelectric effect gradient at the same time on the thickness scale, and has mechanical supporting capacity and biocompatibility, and bionic healing promotion of the patch with the gradient structure is achieved.

The invention relates to the field of physiological status detection, and provides a wearable microfluidic fluorescence sensor based on a Janus membrane for sweat analysis. The sensor comprises a Janus membrane-based micro-fluidic chip and a fluorescent sensing layer which are stacked, the Janus membrane-based micro-fluidic chip comprises a hydrophobic nanofiber membrane, a bottom polydimethylsiloxane layer, a hydrophilic nanofiber membrane and a top polydimethylsiloxane layer which are stacked, and the fluorescent sensing layer comprises three paper chips, the simultaneous fluorescence detection of chloride ions, glucose and pH of sweat is realized. The Janus membrane with the directional water conveying capacity is used as a substrate for preparing a micro-fluidic chip. In one aspect, sweat may be automatically delivered to an analysis zone along a designed path. On the other hand, sweat is transferred from a hydrophobic membrane close to the skin to a hydrophilic membrane, sweat accumulation is effectively avoided, and a comfortable skin microenvironment is promoted. A Janus membrane-based micro-fluidic chip is combined with fluorescence sensing, a micro-fluidic fluorescence sensor based on a Janus membrane is constructed, and simultaneous high-stability and high-accuracy analysis of multiple targets in human sweat is realized.

The invention discloses a phase change energy storage waterborne polyurethane nanofiber membrane and a preparation method thereof. Lignin-based phase change microcapsules are prepared by combining ultraviolet crosslinking with lignin shell packaging, and then the nanofiber membrane containing the phase change microcapsules is prepared through an electrostatic spinning technology. And finally, constructing the waterborne polyurethane phase change fiber membrane with asymmetric wettability through a low-temperature plasma technology. According to the invention, lignin is self-assembled to form nanoparticles, and ultraviolet light induces free radical polymerization to form a polymer film, so that the packaging capability of the phase change material is improved. The phase change microcapsule prepared by the method is high in packaging efficiency and excellent in phase change performance, the preparation process is green and environment-friendly, the technological operation is simple, the temperature of the prepared phase change energy storage waterborne polyurethane nanofiber membrane conforms to the comfortable temperature range of a human body, and the phase change energy storage waterborne polyurethane nanofiber membrane has excellent temperature regulation, waterproof and moisture permeable performance and is suitable for being used in the field of water treatment. Good application prospects are realized in the field of functional textiles with functions of intelligent temperature regulation, water resistance and air permeability and the like.

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 and application of a bimetal organic framework composite fiber membrane, and the preparation method comprises the following steps: 1) adding polyacrylonitrile, an organic ligand and a pore-foaming agent into an organic solvent, uniformly stirring and mixing at room temperature, carrying out electrostatic spinning to obtain primary fibers, and soaking the primary fibers to remove the pore-foaming agent, so as to obtain primary fibers; drying to obtain a polyacrylonitrile nanofiber membrane containing the organic ligand; 2) placing the polyacrylonitrile nanofiber membrane in a mixed solution of bimetallic salt to prepare a fiber membrane containing bimetallic MOF (Co / Zn-MOF) crystal nucleus, and washing the fiber membrane with deionized water for three times; and 3) immersing the fiber membrane into an organic ligand solution, reacting at room temperature, washing with deionized water, and drying to obtain a target product. The antibacterial rate of the bimetallic MOF modified nanofiber membrane prepared by the method in 24 hours can reach 99.5% or above, the removal rate of a common anionic dye solution is 80% or above, and the purpose of efficiently and safely treating industrial wastewater is achieved.

The invention discloses a high-entropy nanoparticle catalytic material with a metal atom shell structure and a preparation method of the high-entropy nanoparticle catalytic material, and belongs to the technical field of preparation of catalytic materials. The preparation method comprises the following steps: dispersing a metal salt and a nanofiber precursor in an organic solvent, and carrying out electrostatic spinning to obtain a nanofiber membrane; and then calcining and pre-oxidizing the nanofiber membrane, and then carbonizing and calcining to obtain the nanofiber membrane. Wherein the selection principle of the metal salt is as follows: (n-1)-(n-2) metals are selected as an alloy substrate, and the sum of the mixing enthalpy of elements of the alloy substrate is not greater than-5kJ mol <-1 >; one or two metal elements serve as a precipitated phase, and the sum of the mixing enthalpy of the metal elements of the precipitated phase and the elements of the alloy substrate is larger than 20 kJ mol <-1 >; the high-entropy nanoparticle catalytic material obtained by the method shows relatively high catalytic activity and stability, and the method has wide universality.

The invention discloses an ionic liquid modified polyimide nanofiber film and an air purification filter screen based on the ionic liquid modified polyimide nanofiber film, and belongs to the technical field of film filtering materials. The preparation method comprises the following steps: firstly, selecting a diamine monomer and a dianhydride monomer to carry out low-temperature polycondensation reaction, and then carrying out solvent replacement and freeze drying to obtain polyamide acid powder; dissolving the powder to obtain a polyamide acid spinning solution, preparing an ionic liquid / polyamide acid spinning solution on the basis, and carrying out electrostatic spinning to obtain an ionic liquid / polyamide acid nanofiber membrane; and finally, carrying out high-temperature thermal imidization treatment to prepare the ionic liquid / polyimide nanofiber membrane. The method is simple and efficient, the problems of low resistance, high pressure drop and the like of a traditional nanofiber film in air filtration are solved, development and application of the nanofiber film in the field of air filtration are further widened, and the nanofiber film has important scientific significance and application value in the fields of high-temperature filtration, gas adsorption and the like.

The invention belongs to the technical field of nano porous materials, discloses a high-strength and low-thermal-conductivity SiC-TiO2 nanofiber aerogel and a preparation method thereof, and aims to solve the problems of insufficient structural stability, shear strength and high-temperature thermal conductivity of traditional ceramic aerogel. TiO2 nanorods are introduced onto a SiC nanofiber membrane by adopting an in-situ growth technology, and the high-strength and low-thermal-conductivity SiC-TiO2 nanofiber aerogel is prepared. And constructing the SiC nano composite fiber membrane into the layered porous ceramic nanofiber aerogel with a multilevel structure by combining a layer-by-layer stacking method with a directional freezing casting technology. TiO2 nanorods growing on the surface of the SiC fiber in situ serve as a secondary structure, so that the overall mechanical performance of the material is enhanced; the TiO2 nanorods have specific high infrared light reflection and scattering capabilities, so that the transmittance of the aerogel material to radiation is reduced, and the thermal radiation conduction in a high-temperature environment is effectively reduced. In addition, a silica sol binder is introduced between layers of the aerogel multilevel structure, stable bonding points are formed between fibers after calcination, and the mechanical stability is improved.

A preparation method of a ceramic nanofiber membrane with a catalytic ozonation function comprises the following steps: S1, mixing ceramic nanofibers with a dispersing agent and a film-forming agent, coating a ceramic membrane support body with the mixture, and drying and sintering to form a ceramic nanofiber membrane with a double-layer asymmetric structure; s2, the ceramic nanofiber membrane with the efficient catalytic ozonation function is prepared through the processes of dipping, drying and firing the ceramic nanofiber membrane in a nano metal oxide precursor solution. The prepared ceramic nanofiber membrane with a double-layer asymmetric structure is taken as a basis, a nano metal oxide precursor solution is taken as a main raw material, and the ceramic nanofiber membrane with a catalytic ozonation function is prepared, so that the removal efficiency of pollutants, especially emerging pollutants such as sulfamethoxazole and tetracycline in a water body can be greatly improved; the problems that an existing catalytic ceramic membrane is low in catalytic efficiency, complex in preparation process, high in cost and the like are effectively solved.

The invention relates to the technical field of preparation of polymer oil-water separation membranes, in particular to a preparation method, a product and application of a hydrophilic PLA oil-water separation membrane. The preparation method of the hydrophilic PLA oil-water separation membrane comprises the following steps: dissolving polylactic acid in an organic solvent to obtain a spinning solution; carrying out electrostatic spinning on the spinning solution to prepare a PLA nanofiber membrane; the PLA nanofiber membrane is soaked in a dopamine hydrochloride solution, then membrane cloth is taken out, washed and dried, and the hydrophilic PLA oil-water separation membrane is obtained. The preparation method is low in cost and simple in preparation process. The PLA (at) PDA nanofiber membrane prepared by the preparation method disclosed by the invention is relatively high in oil-in-water emulsion separation efficiency and relatively high in separation rate, and has a good separation effect on n-hexane, gasoline, petroleum ether, peanut oil and the like, and the separation efficiency can reach 98% or above. The PLA (at) PDA nanofiber membrane disclosed by the invention is simple and convenient to apply and does not cause secondary pollution.

The invention belongs to the technical field of carbon material fibers, and discloses a preparation method of a carbon nanofiber reinforced carbon material fiber fabric, which comprises the following steps: fixing a weakly twisted carbon material fiber tow on an electrostatic spinning nano yarn machine; forming a carbon nanofiber membrane by utilizing electrostatic spinning, uniformly wrapping the carbon nanofiber membrane on a carbon material fiber bundle subjected to weak twisting, then rolling into a shaft, then weaving the rolled fibers into a fabric, and sequentially performing hot pressing and carbonization treatment on the fabric to prepare a carbon nanofiber reinforced carbon material fiber fabric; the weak twisting means that the twisting degree is 5-13 twists per meter. According to the invention, the carbon nanofiber is coated on the carbon material fiber, so that the interface bonding strength between the nanofiber and the carbon material fiber is improved, and then the fabric prepared from the carbon nanofiber is subjected to hot pressing and carbonization treatment, so that the mechanical property, the electrical conductivity and the heat-conducting property of the fabric are further improved; therefore, the composite material has a huge application prospect in the fields of high-performance composite materials, intelligent textiles and the like.

The invention discloses an electrostatic spinning preparation method of a multifunctional composite nanofiber membrane, which comprises the following steps: step 1, sequentially adding PVDF (Polyvinylidene Fluoride) and PLA (Polylactic Acid) into a first mixed solvent, and adding TiO2 while stirring to obtain a shell solution; melting n-octadecane to obtain a core layer solution; step 2, adding PVDF into a second mixed solvent to obtain a PVDF electrospinning solution; 3, the shell layer solution and the core layer solution are subjected to coaxial electrostatic spinning to form core-shell fibers, the PVDF electrospinning solution is subjected to single-shaft electrostatic spinning to form PVDF beads, high voltage is provided, and PVDFamp formed by compounding the core-shell fibers and the PVDF beads is formed on the aluminum foil; the invention relates to a PVDF / PLA / TiO2 (at) Oct composite nanofiber membrane. The material has good anti-ultraviolet, waterproof, breathable, self-cleaning and thermal regulation functions, and has excellent mechanical properties and degradability.

The invention discloses a preparation method and application of a dry self-adhesion flexible capacitive pressure sensor, and the method comprises the steps: dissolving a polymer through an organic solvent, and obtaining an electrostatic spinning precursor solution; performing same-pressure conjugate electrostatic spinning through the electrostatic spinning precursor solution to obtain a self-adhesion composite nanofiber membrane; a nanofiber membrane is obtained through electrostatic spinning; the obtained self-adhesion composite nanofiber membrane is used as a packaging layer, and the nanofiber membrane is used for preparing a flexible electrode in a mode of vacuum filtration of a carbon nanotube; and assembling the obtained packaging layer and the flexible electrode according to a capacitive structure, leading out a wire, positioning the assembled structure by using a hollow mask plate, and completing packaging through a hollow hot pressing technology. Through specific polymer selection and an electrostatic spinning technology, the prepared self-adhesion composite nanofiber membrane can be directly adhered to the skin or other complex surfaces, an additional adhesive is not needed, and the comfort level and the use convenience of a user are improved.

The invention belongs to the field of synthesis and preparation of organic and inorganic hybrid materials, and particularly relates to a gamma-ray shielding nanofiber membrane with a core-shell structure and a preparation method of the gamma-ray shielding nanofiber membrane. The nanofiber membrane is of a double-layer structure comprising a shell and an inner core, the shell is composed of heavy metal micro-nano particles with the medium-high energy segment gamma ray shielding capacity and a high-molecular polymer, and the inner core is composed of heavy metal micro-nano particles with the medium-low energy segment gamma ray shielding capacity and a light high-molecular polymer. The preparation method comprises the following steps: carrying out surface modification on the heavy metal micro-nano particles, preparing a polymer electrostatic spinning precursor solution, and preparing the core-shell structure nanofiber by adopting a coaxial electrostatic spinning technology. The prepared nanofiber membrane has the advantages of light weight, efficient shielding performance and good mechanical performance, is suitable for radioactive protection occasions, can endow other functions through modification or compounding, and has wide application prospects.

The invention relates to the technical field of medical instruments, in particular to an intelligent wound nursing system which comprises a dressing body, and the dressing body comprises a skin-friendly layer, a functional layer and a protective layer. A monitoring module, a control module, a medicine leading-in module, a flexible circuit layer and an alarm module are integrated in the functional layer. According to the method, the infection misdiagnosis rate is reduced through multi-sensor fusion monitoring and a preset infection risk threshold algorithm; according to the design, the micro-fluidic chip and the biological probe are integrated in the percolate component sensor, so that the infection detection rate is increased; a temperature-sensitive hydrogel micro-valve array and nanofiber membrane slow release technology is adopted, so that medicine waste or poor treatment effect is reduced; through a multi-sensor data fusion algorithm, the detection accuracy is improved; the layout of the micro-valve array and the annularly distributed independent medicine storage cavities is adopted, so that the release error is reduced; through the ultrathin flexible framework, the snakelike wiring circuit and flip chip packaging, circuit breakage is avoided, and the clinical failure rate is reduced.

The present invention relates to the technical field of flexible electronics, and relates to a breathable and stretchable circuit capable of being activated by imprinting, and a preparation method therefor and a use thereof. The preparation method for the breathable and stretchable circuit capable of being activated by imprinting in the present invention comprises the following steps: dissolving a thermoplastic polymer in a solvent, adding liquid metal particles, and mixing and dispersing to obtain a mixed solution; carrying out electrospinning on the obtained mixed solution to prepare a nanofiber membrane; and using a stamping model having a circuit pattern to stamp the obtained nanofiber membrane so as to obtain the breathable and stretchable circuit capable of being activated by imprinting. The present invention ensures the breathability and the stretchability by using the nanofiber membrane. The liquid metal particles match fibers in diameter, and therefore, liquid metal in nanofibers can be overflowed by means of imprinting to form a conductive path, achieving high-precision preparation of circuits.

The invention provides a preparation method of a PI / SiO2 modified PET (Polyethylene Terephthalate) high-temperature-resistant composite release film, which comprises the following steps: S1, preparing a polyamide acid fiber film by using a polyamide acid precursor solution as an electrostatic spinning solution and adopting an electrostatic spinning method; s2, applying a drawing force to the polyamide acid fiber membrane at a preset temperature for hot drawing, and then carrying out thermal imidization treatment to obtain a PI nanofiber membrane; s3, adding PET into a mixed solvent of phenol and tetrachloroethane, and stirring until the PET is completely dissolved to obtain a PET solution; s4, adding strawberry-shaped SiO2 gel microspheres into the PET solution, and uniformly stirring to obtain a PET composite solution; and S5, adding the PI nanofiber membrane prepared in the step S2 into a mold, fixedly paving, blade-coating the PI nanofiber membrane with the PET composite solution, and removing the solvent to obtain the high-temperature-resistant release film. According to the invention, the PI electrostatic spinning film is matched with the strawberry-shaped SiO2 gel microspheres, so that the PET release film has better temperature resistance.

A preparation method for a bionic multi-channel nerve conduit, and a bionic multi-channel nerve conduit. A double-layer shape memory nanofiber membrane is used as a receiving substrate, strip-shaped and spaced gel strips are printed on an oriented side, seed cells are planted on the strip-spaced nanofiber membrane, temperature changes are adjusted to cause the fiber membrane at the bottom layer to have a deforming response and curl up, gel strips wrapped by the self-curling fiber membrane self-shape into a conduit, gaps between the gel strips form a multi-channel structure inside the conduit, an inner wall of the multi-channel nerve conduit becomes oriented natural polymer nanofibers which can provide directional guidance for nerve regeneration, and the multi-channel tube structure promotes the formation of a vascular network in the conduit and provides more space for nerve cell growth. The present invention can be applied to long-distance peripheral thick nerve defects, and has good application prospects.

The invention discloses a nanofiber membrane with sustainable cold feeling and a preparation method of the nanofiber membrane. The radiation refrigeration polymer is dissolved in a mixed solvent, and the radiation refrigeration nanofiber membrane is obtained by adopting an electrostatic spinning process; the method comprises the following steps: dispersing a cold-feeling nano-material in a solvent, carrying out ultrasonic treatment to obtain a uniformly dispersed nano-material, and depositing the nano-material on the surface of one side of a radiation refrigeration fiber membrane through a spraying process to obtain the nano-fiber membrane with sustainable cold feeling. According to the nanofiber membrane with the sustainable cold feeling function and the asymmetric heat conduction structures on the two sides, the low-heat-conduction outer side prevents external heat from being conducted to the interior, the high-heat-conduction inner side can enable skin heat to be rapidly transmitted in the surface, instant cold feeling performance is achieved, and dual control over a heat source and a heat conduction path is achieved; meanwhile, internal heat is selectively emitted to the outer space in a heat radiation mode, so that temperature rise of the fiber membrane is slowed down, and the cold feeling is continuously kept. The preparation process is simple, energy is not consumed in the sustainable cold feeling process, and automatic cold feeling is achieved.

The invention discloses a high-air-permeability humidity display film based on optical interference and a preparation process of the high-air-permeability humidity display film. Comprising a substrate layer, a humidity response layer, a middle layer and a hydrophobic layer, wherein the substrate layer is made of a transparent material; a plurality of breathable micropores are formed in the substrate layer; the humidity response layer is a thin film layer which is made of a humidity sensitive material and has the thickness of 50-100 [mu] m, micropores are formed in the humidity response layer, and the pore diameter of the micropores is 0.5-2 [mu] m; the middle layer is a nanofiber membrane, and the fiber diameter of nanofiber is controlled to be 100-300 nm; the density of the middle layers in the length direction is in gradient change so as to control the air permeability of the humidity response layers corresponding to the middle layers with different densities; the hydrophobic layer is made of a transparent and breathable material and provides a good protection effect for the humidity display film. According to the invention, the hydrophilic microporous structure material is adopted, the humidity can be rapidly conducted to the humidity response layer through the multilayer design, instant color change is generated, and the humidity indication effect is more sensitive.

The invention provides a flexible electromagnetic shielding film and a preparation method thereof. The preparation method comprises the following steps: mixing metal gallium and metal indium in a preset proportion to prepare a gallium-indium alloy; the preparation method comprises the following steps: putting a preset mass of gallium-indium alloy into an isopropanol solution, and treating through an ultrasonic cell disruption system to obtain a liquid metal particle suspension; stirring magnetic functional nanoparticles, an electrostatic spinning high-molecular elastomer and a solvent at normal temperature for a preset time to obtain an electrostatic spinning homogeneous solution; treating the electrostatic spinning homogeneous solution by adopting an electrostatic spinning process to obtain a magnetic nanofiber membrane; and spraying the liquid metal particle suspension onto the magnetic nanofiber membrane by adopting an electrostatic spraying process to obtain the flexible electromagnetic shielding film. According to the flexible electromagnetic shielding film and the preparation method thereof, the problem that the stability of an existing shielding material is reduced under the stretching effect can be solved.

The invention provides a preparation method of a bio-based membrane with efficient waterproof and moisture permeable performance, which comprises the following steps: a) mixing polyurethane, a polymer and a mixed solvent to obtain a mixed solution; the polymer is selected from one or more of PVA (Polyvinyl Alcohol), PVA-co-PE (Polyvinyl Alcohol-co-Polyethylene) and chitosan; b) stirring the mixed solution, standing and defoaming; c) performing electrostatic spinning on the obtained spinning solution; d) grafting silicon dioxide particles on the surface of the obtained PU nanofiber membrane by adopting a hydrothermal assisted sol-gel process, carrying out heat treatment, soaking, taking out, and continuously carrying out heat treatment; e) soaking the obtained PU nanofiber membrane grafted with the SiO2 particles on the surface in an ethanol solution containing tetraethoxysilane, taking out and carrying out heat treatment; and f) drying and cooling the obtained waterproof permeable membrane with the multi-layer pore structure to obtain the bio-based membrane with efficient waterproof and moisture-permeable properties. The bio-based membrane prepared by the method has efficient waterproof and moisture permeable properties.

The invention discloses a preparation method of a silk fibroin-based electrostatic spinning composite nanofiber membrane. The preparation method comprises the following steps: S1, obtaining silk fibroin; s2, preparing silk fibroin and a modifier into a spinning solution; the modifier is one or more of carvacrol, chitosan or chitosan quaternary ammonium salt; and S3, preparing the nanofiber membrane by adopting an electrostatic spinning method. The nanofiber membrane has the advantages of high antibacterial rate, high water permeability, good biocompatibility, excellent food preservation performance and excellent biodegradability.

The invention relates to the field of flexible sensing, and discloses a flexible dual-mode sensor with a foot arch and motion detection function, the flexible dual-mode sensor comprises an upper substrate, a lower substrate, an electrode layer, a conductive pin, a PVDF doped BTO-NPs nanofiber film and a PVDF doped ionic salt solution nanofiber film, the upper substrate and the lower substrate are polyimide films (PI), the electrode layer is an immersion gold (Au) pad, and the conductive pin is arranged on the electrode layer. The conductive pin is formed by fixing a copper wire on the electrode plate through silver paste, the nanofiber membrane is obtained by PVDF doped BTO-NPs and PVDF doped ionic salt electrostatic spinning, the gold immersion (Au) bonding pad membrane is designed on the PI substrate to form polar plates and electrodes of the capacitive sensor and the piezoelectric sensor, and the electrode plate is led out through the copper wire to serve as the conductive pin. According to the flexible dual-mode sensor, the flexible PI in a specific shape is prepared to serve as the upper substrate and the lower substrate of the flexible dual-mode sensor, and the gold immersion (Au) bonding pad films are designed on the PI substrates, so that the flexible sensor has flexibility and ductility and is more attached to surfaces with different curvatures.

The invention belongs to the technical field of molecular probes and nano textile materials, and particularly relates to a fluorescent probe for detecting metal palladium, a fluorescent nanofiber membrane and a preparation method and application of the fluorescent nanofiber membrane. The fluorescent probe for detecting metal palladium provided by the invention takes benzopyran as a fluorescent parent nucleus and allyl as a recognition site, is novel in structure, and can realize effective detection of elemental palladium in the environment. Furthermore, according to the fluorescent nanofiber membrane for detecting the metal palladium, the electrostatic spinning technology and the fluorescent probe are effectively combined, and rapid detection of the elemental palladium can be achieved through the fluorescence opening performance after the fluorescent probe reacts with the metal palladium. Besides, the fluorescent nanofiber membrane has the characteristics of simplicity in preparation, low cost and reusability, can provide a powerful tool for rapid, simple and convenient detection of palladium-containing elementary substance pollutants in the environment, and has an extremely wide application prospect in the field of metal palladium detection.

The invention discloses a preparation method and application of a composite PVDF-HFP and polylysine nanofiber diaphragm, and belongs to the technical field of lithium batteries. The composite material is prepared by blending polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) and polylysine and then carrying out an electrostatic spinning process. The PVDF-HFP is utilized to provide excellent mechanical strength and chemical stability, rich polar amino functional groups in a polylysine molecular chain are utilized to improve the lyophilic property of the membrane, and anions in an electrolyte are fixed through an intermolecular acting force, so that the transference number of lithium ions is increased, and the lithium ions are induced to be uniformly deposited. The nanofiber membrane combines the characteristics of PVDF-HFP and polylysine, has high porosity, good thermal stability and excellent interface compatibility, can effectively inhibit the growth of lithium dendrites and prevent the diaphragm from being punctured, and can significantly prolong the cycle life and improve the safety performance of the lithium metal battery when being applied to the lithium metal battery.

The invention provides a superfine-diameter PCL / COL nanofiber membrane as well as a preparation method and application thereof, and relates to the technical field of skin wound repair materials. The PCL / COL nanofiber membrane material is prepared from PCL and I-type collagen as raw materials through electrostatic spinning and vacuum drying. According to the preparation method disclosed by the invention, an electrostatic spinning technology is combined with strict regulation and control on parameters, so that the stable and superfine 40-nanoscale PCL / COL nanofiber membrane material is prepared. The diameter of the superfine PCL / COL nanofiber membrane material reaches the bionic scale of the minimum natural collagen of an extracellular matrix, and meanwhile, the superfine PCL / COL nanofiber membrane material shows more excellent hydrophilicity and lower surface roughness, has good biological safety and mechanical stability, not only realizes high matching with a natural ECM hierarchical structure, but also has good application prospects. By enhancing the cell-material interface interaction, the adhesion, proliferation and migration capacities of fibroblasts are remarkably improved, the wound healing period can be effectively shortened, an excellent repair promoting effect is shown, and a solid foundation is laid for clinical transformation of materials.

The invention relates to the technical field of sewage treatment, in particular to an electrostatic spinning PVDF nanofiber membrane for sewage treatment and a preparation method and application of the electrostatic spinning PVDF nanofiber membrane. The preparation method comprises the following steps: dissolving PVDF (Polyvinylidene Fluoride) particles in a mixed solvent of DMF (Dimethyl Formamide) and acetone, adding nano TiO2 particles subjected to APTES (Aminopropyltriethoxysilane) surface modification, and adding PVP (Polyvinyl Pyrrolidone) into the solution to obtain a uniform spinning solution; spinning by adopting electrostatic spinning equipment to obtain a PVDF / TiO2 / PVP nanofiber membrane; the nanofiber membrane is soaked in a sodium hydroxide solution, then the membrane is soaked in a Tris-HCl buffer solution containing dopamine, and the final electrostatic spinning PVDF nanofiber membrane is obtained. The average diameter of nanofibers of the nanofiber membrane is 200-300nm, the porosity of the membrane is 70-80%, and the water contact angle is less than 60 degrees; when the nanofiber membrane is used for treating sewage containing organic pollutants and heavy metal ions, the removal rate of the nanofiber membrane on methyl orange can reach 95% or above; the rejection rate of copper ions can reach 90% or above; the removal efficiency of organic pollutants and heavy metal ions is obviously improved.

The invention provides an optical transparency-optical confinement composite nanofiber membrane as well as a preparation method and application thereof. The optical transparency-optical confinement composite nanofiber membrane comprises a PDMS (Polydimethylsiloxane) / PS (Polystyrene) / TPU (Thermoplastic Polyurethane) nanofiber membrane and a photothermal conversion material layer loaded on the PDMS / PS / TPU nanofiber membrane, the PDMS / PS / TPU nanofiber membrane is prepared by taking PDMS, PS and TPU as raw materials and adopting an electrostatic spinning technology; the photothermal conversion material layer comprises honeycomb porous carbon nanofibers and PDA (Personal Digital Assistant). The optical transparency-optical confinement composite nanofiber membrane and the PDMS / PS / TPU nanofiber membrane have excellent light transmittance and hydrophobicity, the photo-thermal conversion material layer has excellent light absorptivity and high photo-thermal conversion capacity, and the optical transparency-optical confinement composite nanofiber membrane has high membrane flux when being used for photo-thermal membrane distillation desalination. And the photo-thermal film is excellent in distillation performance stability.