943 results about "Polypyrrole" patented technology

The invention belongs to the technical field of gel materials, and particularly relates to aerogel powder for polyolefin modification and a preparation method and application thereof. The preparation method of the aerogel powder comprises the following steps: (1) preparing aramid nanofiber dispersion liquid; (2) preparing a polypyrrole coated aramid nanofiber dispersion liquid; (3) mixing polyamide acid and the polypyrrole coated aramid nanofiber dispersion liquid, and then carrying out partial imidization and solvent exchange to prepare hydrogel; and (4) carrying out freeze drying, thermal imidization and crushing to obtain the aerogel powder for polyolefin modification. The aerogel powder is a porous solid material formed by forming one-dimensional composite fibers from aramid nanofibers and polypyrrole and combining the one-dimensional composite fibers with polyimide resin. The aerogel powder and polyolefin resin are compounded to obtain the polyolefin resin composite material with high strength and antistatic property, and the polyolefin resin composite material can be widely applied to the fields of pipes, plates, grouting equipment parts, grouting bags and the like.

The invention belongs to the technical field of fiber materials, and particularly relates to a modified aramid nanofiber as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing an aramid nanofiber dispersion liquid; (2) modifying the aramid nanofiber by using POSS; and (3) carrying out in-situ polymerization on polypyrrole on the surface of the aramid nanofiber. POSS (polyhedral oligomeric silsesquioxane) has a relatively large volume exclusion effect, the template effect of long-chain alkyl quaternary ammonium salt can be influenced by scattered adhesion of POSS on the surface of aramid nanofiber, uneven polymerization of pyrrole monomers is caused, and formation of a rough structure on the surface of the fiber is facilitated. According to the invention, the polypyrrole-coated aramid nanofiber with a coarse structure is used as a polyolefin modified material, so that the problem of low interfacial force existing in a common filler is solved, and the polyolefin resin composite material with high strength and antistatic property is obtained and can be widely applied to the fields of pipes, plates, grouting equipment parts, grouting bags and the like.

The invention discloses a preparation method of a degradable transparent conductive polymer film, and belongs to the technical field of film preparation. Preparing dispersion liquid I through graphene oxide quantum dots; preparing a dispersion liquid II from polyaniline nanofibers; dissolving pyrrole and toluenesulfonic acid in N, N-dimethylformamide to prepare a reaction solution, adding the dispersion liquid I and the dispersion liquid II, stirring, and adding ferric chloride hexahydrate to obtain a reaction solution; adjusting the pH value of the reaction solution to 1.5, and heating to obtain a polypyrrole solution; preparing cellulose acetate, polyvinyl alcohol and N, N-dimethylformamide to obtain a cellulose acetate solution; mixing the polypyrrole solution and the cellulose acetate solution, adding glutaraldehyde to obtain a mixed solution, and pouring the mixed solution into a mold to prepare a composite wet film; and putting the composite wet film into a hot-pressing forming machine for hot-pressing to generate the polymer film. The conductive polymer film prepared by the invention can be applied to the fields of supercapacitor electrode materials, electromagnetic shielding materials, flexible sensors and the like, and provides a new high-performance material choice for the development of related fields.

The invention belongs to the technical field of fuel cell electrode material preparation, and particularly relates to a carbon electrode material for a polypyrrole modified bio-based fuel cell and a preparation method of the carbon electrode material. Comprising the following steps: modifying rice hull low-temperature carbonized powder by sequentially adopting POSS (Polyhedral Oligomeric Silsesquioxane) containing unipolar functional groups and POSS containing polypolar functional groups to obtain modified low-temperature carbonized powder; and carrying out in-situ polymerization on a pyrrole monomer on the surface of the modified low-temperature carbonized powder, and carrying out high-temperature carbonization and hydrofluoric acid corrosion to obtain the polypyrrole modified bio-based fuel cell carbon electrode material. The polypolar functional group POSS not only is beneficial to the in-situ polymerization reaction of pyrrole, but also can form a continuous macromolecular chain, and a net structure is formed on the surface of the whole material. The effect of the unipolar functional group POSS is to improve the stability of the low-temperature carbonized powder in the high-temperature carbonization process, and more importantly, the unipolar functional group POSS is to provide a channel for subsequent hydrofluoric acid corrosion, etch away non-conductive substances and improve the conductivity and specific surface area of the carbon electrode material.

The invention discloses a preparation method and application of a pH-responsive controllable oil-water separation material, polyurethane sponge is used as a substrate, polypyrrole is attached to the sponge substrate through an in-situ polymerization method, a pH-responsive polymer is introduced into the sponge substrate through a soaking method, and finally the pH-responsive controllable oil-water separation material is obtained. The controllability of the material in the oil-water separation process is reflected as follows: due to the introduction of the pH responsive polymer, the surface of the material has pH responsiveness, the surface of the material has different wettability by adjusting the pH value, different types of oil-water mixtures can be controllably separated in a targeted manner, and the adsorption and desorption of oil products can be realized. Due to the introduction of polypyrrole, the material has good photo-thermal conversion capacity, the viscosity of crude oil can be effectively reduced, and the absorption rate of the crude oil can be improved. The material with pH responsiveness has wide application prospects in the fields of oil-water separation, oil product adsorption and desorption and crude oil absorption.

The invention relates to the technical field of lithium batteries, in particular to a composite binder aqueous solution, a silicon-based negative pole piece and a preparation method and application of the silicon-based negative pole piece. The preparation method of the composite binder aqueous solution comprises the following steps: dissolving a water-based polymer binder and a micromolecular physical crosslinking agent in water, adding pyrrole, stirring, adding an initiator, and mixing to obtain the composite binder aqueous solution. A small molecule physical cross-linking agent is introduced into the water-based polymer binder, and a large number of hydrogen bond binding sites are increased, so that the mechanical property of the binder is remarkably enhanced, and the machinability of the pole piece is further improved. Meanwhile, polypyrrole can be generated in the binder through in-situ polymerization, and the polypyrrole can be tightly coated on the surfaces of the silicon particles through strong interaction between the binder and the silicon particles to form a stable conductive network, so that the charge transfer capability of the electrode is remarkably improved. In addition, the composite binder is also beneficial to formation of a solid electrolyte layer rich in Li-N and participates in formation of a solid electrolyte interface layer, so that the lithium ion transmission capability of the composite binder is further improved.

The invention discloses a preparation method and application of a conductive polypyrrole compound. The preparation method comprises the following steps: (1) preparing an emulsion system; (2) adding an oxidizing agent; (3) diluting and dropwise adding monomer pyrrole, and reacting for 6-24 hours; and (4) washing the product, and applying the product to preparation of the foamed conductive polyurethane foam. Comprising the following steps: 1, filtering a conductive polypyrrole compound; 2, carrying out synthesis post-treatment on the conductive polypyrrole compound; 3, effectively mixing the polypyrrole compound with a commercial polyurethane foaming component (firstly premixing with an isocyanate-containing component or a polyol-containing component, and then effectively mixing with another polyol-containing component or an isocyanate-containing component); and 4, carrying out one-time forming foaming to obtain the conductive product. The preparation method has the advantages that better dispersion can be realized by synthesizing the conductive polypyrrole compound which is microcosmically in a nano-scale dendritic shape, and the use amount of a conductive material is reduced; the foamed conductive polyurethane foam is simple and convenient to construct, can be foamed instantly, has high foaming rate, retains the original mechanical properties by more than 50%, and has good conductivity.

The invention discloses a polypyrrole / cobalt / nitrogen-doped carbon composite material with a coaxial hollow structure and a preparation method thereof, and belongs to the technical field of advanced functional composite materials. The method comprises the following steps: firstly, synthesizing a hollow polypyrrole nanotube by a soft template method; secondly, cobalt / nitrogen-doped carbon is synthesized by adopting a template guiding method; and finally, secondarily coating the outer surface of the cobalt / nitrogen-doped carbon with a polypyrrole layer by adopting an in-situ oxidative polymerization method to construct the polypyrrole / cobalt / nitrogen-doped carbon composite material with a coaxial hollow heterostructure, and the polypyrrole / cobalt / nitrogen-doped carbon composite material has a coaxial sandwich structure: the inner core is a nitrogen-doped carbon hollow tube, the middle layer is a nitrogen-doped porous carbon matrix embedded with cobalt nanoparticles, and the outer surface of the cobalt / nitrogen-doped carbon composite material is a porous carbon matrix embedded with cobalt nanoparticles. And the outer layer is a conductive polypyrrole coating layer. The preparation method provided by the invention can successfully realize in-situ confinement growth and stable combination of ZIF-67, and has the advantages of high repetition rate, high yield and simple method; by adjusting the proportion of polypyrrole in the composite material, good impedance matching and large dielectric loss can be realized, and excellent electromagnetic wave absorption performance can be obtained.

The invention relates to the technical field of high polymer materials, in particular to a high-entropy alloy modified polyvinyl alcohol / polypyrrole composite hydrogel material as well as a preparation method and application thereof. Firstly, a polypyrrole aqueous solution is prepared through chemical oxidative polymerization, and high-entropy alloy nanoparticles are synthesized through a Joule thermal technology; and then mixing a polypyrrole aqueous solution, the high-entropy alloy nanoparticles and a polyvinyl alcohol aqueous solution, and adding a cross-linking agent and a catalyst to prepare the high-entropy alloy modified polyvinyl alcohol / polypyrrole composite hydrogel material. According to the composite hydrogel, under the synergistic effect of the high-entropy alloy, the light absorption performance is remarkably improved, wide-spectrum efficient absorption of ultraviolet rays, visible light and near-infrared light in a solar spectrum is achieved, and meanwhile the mechanical strength and chemical stability of the material are enhanced. The preparation process is simple, the cost is low, and the prepared composite hydrogel has wide application prospects in the fields of seawater desalination, wastewater treatment and the like as a solar interface evaporator.

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 preparation method of a broadband heat-conducting and wave-absorbing gasket and the broadband heat-conducting and wave-absorbing gasket, and relates to the technical field of wave-absorbing materials. The preparation method of the broadband heat-conducting wave-absorbing gasket comprises the following steps: S300, adding pretreated Fe-Si-Al powder into a reaction system of polypyrrole under the protection of nitrogen, and continuously stirring until polypyrrole forms a coating layer on the surface of the pretreated Fe-Si-Al powder; s400, after the reaction in the step S300 is finished, separating a reaction mixture in the step S300 to obtain polypyrrole coated Fe-Si-Al powder, and washing and drying the polypyrrole coated Fe-Si-Al powder; and S500, mixing the dried polypyrrole coated Fe-Si-Al powder with a polymer matrix material, a heat-conducting filler, a curing agent, a dispersing agent, an inhibitor and a catalyst to obtain a mixture, pressing the mixture into sheets, and curing the sheets to obtain the broadband heat-conducting wave-absorbing gasket. By the adoption of the technical scheme, the advantages of being capable of effectively absorbing electromagnetic waves in a broadband and good in heat conduction performance are achieved.

The invention discloses a preparation method of a double-layer polypyrrole deposition foam nickel sodium alginate hydrogel solar evaporator, and belongs to the field of preparation of solar evaporators. The invention aims to solve the problems that the evaporation rate of the evaporator is reduced and the long-term stability of the evaporator is influenced due to salt accumulation on the evaporation surface of the existing solar interface evaporator. The method comprises the following steps: 1, preparing a foamed nickel light absorption layer of electro-deposition polypyrrole; 2, preparing a sodium alginate hydrogel; and 3, combining the water absorption layer and the light absorption layer to prepare the solar seawater evaporation system. The preparation method is used for preparing the double-layer polypyrrole deposition foam nickel sodium alginate hydrogel solar evaporator.

The invention provides a modified lithium iron manganese phosphate positive electrode material, a preparation method thereof and a lithium ion battery, and relates to the technical field of lithium ion battery materials. The positive electrode material comprises a phosphorus source, an iron source, a manganese source, a lithium source and a magnesium source. Mixing a titanium source solution, carrying out hydrothermal reaction, centrifugally washing and drying to synthesize the lithium manganese iron phosphate, and coating polypyrrole and a glucose carbon layer to improve the electronic conductivity of the lithium manganese iron phosphate. The magnesium-titanium co-doped stable crystal structure is introduced, the lithium ion diffusion path is shortened, the dissolution of the manganese element is inhibited, the structural change in the charging and discharging process is reduced, the side reaction with the electrolyte is inhibited by coating the cobalt boride, and the electrochemical performance of the lithium manganese iron phosphate is improved. The primary nano-particles improve ionic conductivity, and the secondary nano-particles are nano-particles formed by assembling the primary nano-particles and have the advantages of being good in rate capability, high in compaction density and high in tap density.

The invention discloses a PPy / NiCo-LDH / NF composite material and a preparation method and application thereof, and belongs to the technical field of electrocatalyst preparation. The PPy / NiCo-LDH / NF composite material provided by the invention comprises a foamed nickel substrate as well as NiCo layered double hydroxides and polypyrrole which are compounded on the foamed nickel substrate, the polypyrrole is compounded on the surface of the NiCo layered double-metal hydroxide. The surface of NiCo layered double hydroxides is induced and modified by polypyrrole, so that the layered double hydroxides are arranged more regularly and densely, efficient mass transfer of electrons is facilitated, an electron transfer interface can be induced, the composite material exposes more catalytic active sites, the electron interaction is enhanced, and the catalytic activity of the composite material is improved. According to the present invention, with the preparation method, the excellent electrocatalytic activity is provided for the HER and the OER in the alkaline medium, and the excellent cycle stability is provided for the HER and the OER in the alkaline medium after the 1000 times of cycle, such that the wide application prospect in the electrocatalytic reaction is provided.

The invention belongs to the technical field of aerogel, and particularly relates to high-conductivity aerogel powder as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly preparing a graphene / polypyrrole nanosheet composite material with a three-dimensional structure, and then preparing the polyimide / graphene / polypyrrole ternary hybrid conductive aerogel by taking a polyamide acid solution as a precursor through a solution dipping and freeze drying process. Polyimide is used as a framework of high-conductivity aerogel powder, excellent mechanical strength and structural integrity are provided, the common brittleness problem of a pure graphene carbon material or polypyrrole conductive polymer aerogel is solved, and the three-dimensional graphene / polypyrrole nanosheet composite material has excellent elasticity and toughness and can be used for preparing a composite material with high conductivity. The polyimide aerogel prepared by the method can be dispersed in a polyimide matrix as a nano reinforcement, can effectively transfer stress and prevent crack propagation, and endows the aerogel with higher mechanical properties.

The embodiment of the invention relates to the field of energy storage, and provides a secondary battery and a preparation method thereof, an energy storage system and electric equipment. The negative electrode active material comprises a silicon-based material, honeycomb porous graphite and a polypyrrole layer, the surface of the honeycomb porous graphite is coated with the polypyrrole layer, the silicon-based material is embedded in pores of the honeycomb porous graphite, and the silicon-based material comprises silicon particles, a poly N-isopropylacrylamide layer and a disulfide bond-containing polyaniline layer. The poly (N-isopropylacrylamide) layer and the disulfide bond-containing polyaniline layer are coated on the surfaces of the silicon particles, the poly (N-isopropylacrylamide) layer is positioned between the silicon particles and the disulfide bond-containing polyaniline layer, and the honeycomb porous graphite comprises a graphite flake and a carbon layer which is positioned on the surface of the graphite flake and is of a honeycomb pore structure. The secondary battery formed by assembling the negative electrode active material disclosed by the invention has relatively high cycling stability, high temperature resistance, rate capability, gram volume and safety.

The invention discloses a lithium ion battery negative electrode with low expansion and low impedance. The lithium ion battery negative electrode comprises a composite current collector and a negative electrode active material coating coated on at least one surface of the composite current collector, the negative electrode active material coating comprises a negative electrode active material, graphene and lithium polyacrylate; the mass ratio of the negative electrode active material to the graphene to the lithium polyacrylate is (90-99): (0.5-5): (0.5-5), the negative electrode active material comprises a silicon carbon material and a coating material layer arranged on the outer surface of the silicon carbon material, and the coating material layer comprises a polypyrrole layer and single-walled carbon nanotubes uniformly distributed in the polypyrrole layer. Compared with the prior art, the lithium ion battery negative electrode provided by the invention has the advantages of low expansion and low impedance, and can effectively inhibit the expansion of silicon particles, reduce the internal resistance of the battery and maintain the structural stability of the electrode.

The invention belongs to the technical field of negative-electrode-free sodium metal batteries, and particularly discloses a negative-electrode-free sodium battery modified current collector and a preparation method and application thereof.The preparation method includes the steps that on the basis of polypyrrole preparation, transition metal salt is added, and the nitrogen doping type in polypyrrole-derived nitrogen-doped nano carbon particles is regulated and controlled. The negative-electrode-free sodium battery modified current collector prepared by the preparation method disclosed by the invention is high in relative content of N-6 and N-5 type doped nitrogen, so that the sodium affinity of a nitrogen-doped coating is improved, the nucleation over-point location of sodium metal is reduced, the reversibility of a sodium deposition / stripping reaction is improved, and the electrochemical performance of a negative-electrode-free sodium battery is further improved.

The invention discloses a method for preparing flame-retardant and wear-resistant fibers for fireproof clothing by using regenerated polyester fibers, and belongs to the technical field of fiber processing, and the method specifically comprises the following steps: mixing polyester alcoholysate, a siloxane-based modifier, a catalyst and an additive, and carrying out condensation polymerization for 3-5 hours, namely modifying the polyester alcoholysate by using the siloxane-based modifier, and adding the additive into the polyester alcoholysate to obtain the flame-retardant and wear-resistant fibers for fireproof clothing. Regenerated polyester fibers with rigid frameworks and flexible networks are prepared through melt spinning and hot drafting, and then surface enhancement protection is performed through polypyrrole, so that the mechanical strength of the wear-resistant and flame-retardant fibers is effectively improved, and the wear resistance and flame retardance of the wear-resistant and flame-retardant fibers are also improved; and the composite material can be more easily applied to special fields such as fireproof suits.

The invention provides a preparation method and application of polypyrrole graphene oxide hydrogel with an anisotropic structure. The preparation method comprises the following steps: adding sodium hydroxide and urea into water according to a certain proportion, adding microcrystalline cellulose into an alkali urea solution, uniformly stirring, and repeatedly freezing and thawing to obtain a cellulose solution; adding graphene oxide into water for cell disruption and dispersion to obtain a uniform graphene oxide solution; adding the graphene oxide solution into the cellulose solution, then adding an epichlorohydrin cross-linking agent, and carrying out stirring treatment, centrifugation and low-temperature standing to form gel; and pre-stretching the hydrogel to a certain length, immersing the hydrogel into a dilute sulphuric acid solution, taking out the hydrogel, adding pyrrole, carrying out polymerization growth in a closed environment, taking out the hydrogel, soaking the hydrogel in water, and washing the hydrogel to obtain the anisotropic polypyrrole graphene oxide hydrogel. The anisotropic polypyrrole graphene oxide cellulose hydrogel disclosed by the invention has excellent solar photo-thermal water evaporation performance and also has excellent thermal management performance.

The invention discloses a composite positive electrode of an aqueous zinc battery, a preparation method of the composite positive electrode and the aqueous zinc battery, and belongs to the field of secondary batteries. Comprising a current collector and a conductive polymer, the conductive polymer is deposited on the current collector; the conductive polymer is selected from at least one of polypyrrole and derivatives thereof, polythiophene and derivatives thereof, and polyaniline and derivatives thereof. The composite positive electrode of the aqueous zinc battery has high conductivity and excellent stability, and the aqueous zinc battery assembled by the composite positive electrode has high specific capacity and good cycle performance.

The invention is suitable for the technical field of photocatalyst preparation, and provides a modified tubular g-C3N4 loaded Ni-CoP photocatalyst and a preparation method thereof. The preparation method comprises the following steps: calcining a carbon nitride precursor in stages to obtain tubular carbon nitride, stirring the tubular carbon nitride with a cobalt and nickel-containing compound and an alkaline compound, washing and drying to obtain a precipitate, calcining, mixing and grinding with a phosphorus-containing compound, calcining again, and modifying the product with polydopamine and polypyrrole to obtain the composite material. The photocatalyst modified by the polydopamine and the polypyrrole and loaded with the Ni-CoP by taking the tubular g-C3N4 as the carrier is obtained. According to the invention, three-in-one synergistic integration of'carrier-modifier-cocatalyst 'is realized, the prepared photocatalyst still keeps tubular morphology and has a larger specific surface area, the requirements of anode oxygen evolution reaction (OER) on rapid charge separation and transmission can be met, meanwhile, the light absorption range is widened, the solar energy utilization rate is increased, and a foundation is laid for efficient OER reaction.

The invention discloses a preparation method of flame-retardant fire early-warning bacterial cellulose aerogel fibers, and belongs to the technical field of materials. According to the preparation method, bacterial cellulose is taken as a core raw material, then a phytic acid-polypyrrole conductive network is constructed in the fiber through a solvent replacement effect, and a ZnO-MXene sensing material with high flame sensitivity is further covered on the surface, so that the flame-retardant bacterial cellulose aerogel fiber with excellent flame retardance and high flame sensitivity is prepared. The preparation method is simple, convenient and efficient, resource recycling is effectively promoted, and the prepared flame-retardant fire early-warning bacterial cellulose aerogel fiber has wide application prospects in the fields of vehicle interiors, clothes and furniture.

The invention relates to the technical field of functional composite probe material preparation, in particular to a three-core spinning technology-based bio-compatible gel probe and a preparation method thereof, and the three-core spinning technology-based bio-compatible gel probe comprises a composite skin layer and three functional core layers; the composite skin layer is composed of a sodium alginate-polydopamine-chitosan grafted copolymer in a mass ratio of 2: 1: 0.5, and contains # imgabs 0 # chondroitin sulfate and # imgabs 1 # polyoxyethylene; the three core layers are respectively a carbon nanotube-polyaniline # imgabs2 # hybrid material, a graphene-polypyrrole-boron nitride hybrid material and a # imgabs3 # polythiophene-hydroxyapatite hybrid material, and the mass ratio of the carbon material to the conductive polymer to the newly added nano material in each core layer is 1: 2: 0.3; and the diameter ratio of the skin layer to the three core layers is 1: 0.28: 0.22: 0.17. According to the invention, multichannel signal transmission is realized, the impedance is reduced by the hybrid material, and the conductivity is improved; the composite skin layer is matched with soft tissue mechanical properties, and interface bonding is stable; and the biocompatible component reduces inflammation, is suitable for acquiring nerve electrophysiological signals, and is easy for large-scale production.

The invention belongs to the technical field of conductive polymer materials, and particularly relates to a three-dimensional polypyrrole conductive material and a preparation method and application thereof. The preparation method of the three-dimensional polypyrrole conductive material comprises the following steps: (1) preparing a metal copper quantum dot and graphene oxide mixed dispersion liquid; (2) adding an oxidizing agent to obtain a reaction solution; (3) adding a pyrrole monomer, and carrying out a polymerization reaction to obtain a graphene oxide / polypyrrole composite dispersion liquid; and (4) adding a reducing agent to reduce the graphene oxide to obtain the three-dimensional polypyrrole conductive material. After the metal copper quantum dots are loaded on the graphene oxide sheet layer, the graphene oxide sheet layer becomes a structure-oriented core in subsequent polymerization, and finally the stable three-dimensional conductive composite material with graphene as a framework and polypyrrole nanosheets as connection points is formed. Compared with a traditional three-dimensional material formed by overlapping and integrating a two-dimensional graphene sheet layer and a conductive nanowire / nanorod, the three-dimensional material with the structure can form an efficient conductive path more easily under the condition of low filler content.

The invention relates to the technical field of composite materials, in particular to a high-conductivity thermosetting resin-based composite material and a preparation method thereof.The high-conductivity thermosetting resin-based composite material is prepared from, by weight, 50-80 parts of epoxy resin, 10-30 parts of conductive carbon nanotubes, 20-40 parts of nano-silver particles, 10-20 parts of functionalized polyurethane prepolymer, 5-15 parts of polyamine curing agent and 2-8 parts of organosilane coupling agent. 5-15 parts of graphene nanosheets, 5-15 parts of aluminum borate whiskers and 5-15 parts of barium titanate nanoparticles; 2-10 parts of conductive polymer microspheres; 1 to 5 parts of nano zinc oxide; wherein the conductive polymer microsphere comprises a core formed by polyaniline or polypyrrole, and a polyurethane polymer or a polyacrylate polymer wrapping the outer layer of the core; the surface of the core is modified by adopting nano silver particles and gamma-aminopropyltriethoxysilane; the conductive polymer microspheres are used for providing a long-range conductive path, the nano-silver particles are used for providing short-range conductive connection, and the conductive polymer microspheres and the nano-silver particles form a multi-layer conductive network.

The invention provides a mechano-electric coupling hydrogel microsphere with stable mechanical property and low loss transduction as well as a preparation method and application thereof, and belongs to the technical field of tissue engineering bioremediation materials. According to the invention, supramolecular engineering and microfluidic technologies are utilized, and a slip ring structure polyrotaxane and conductive polypyrrole network is introduced to construct stress-electric coupling hydrogel microspheres. The molecular slippage mechanism of the slip ring structure stores and releases mechanical energy to reduce mechanical loss, and the conjugated pi-electron movement in the conductive network improves the electron transfer efficiency in the microsphere, so that the loss in stress-electricity conversion is reduced for the first time. Compared with the traditional piezoelectric hydrogel microspheres, the stress-electric coupling efficiency of the low-dissipation microspheres is improved by 2.3 times, and the energy dissipation rate is reduced to 43%. The mechano-electric coupling hydrogel microspheres can reduce cartilage injury of rats, improve behavior results and promote treatment of osteoarthritis by recovering low-loss transduction between tissues.

The invention discloses a preparation method of an electrochemical biosensor based on neuraminidase, and relates to the field of electrochemical sensors. The method comprises the following steps: preparing N-Gr / MWCNTs, preparing N-Gr / MWCNTs (at) GCE, preparing Ppy / N-Gr / MWCNTs (at) GCE, and preparing NA / Ppy / N-Gr / MWCNTs (at) GCE. According to the electrochemical biosensor based on neuraminidase, MWCNTs and N-Gr are compounded to form an N-Gr / MWCNTs composite material, high-conductivity polypyrrole is polymerized on the N-Gr / MWCNTs composite material through pyrrole, the biosensor without a mediator is prepared, electrons can be directly transmitted between an electrode and a bioactive substance, and the electrochemical biosensor can be used for detecting neuraminidase. The response performance of the sensor is obviously improved; the electrochemical biosensor is based on the NA inhibition principle, is mainly used for rapidly screening antiviral components in traditional Chinese medicines, can realize rapid screening and evaluation of the antiviral components in the traditional Chinese medicines, belongs to a convenient, efficient and low-cost means, and also provides scientific basis and technical support for discovery and evaluation of active components.

The invention belongs to the technical field of solar-driven interface evaporation, and particularly relates to a solar-driven interface evaporation aerogel material based on gradient modification and a preparation method and application thereof. The preparation method specifically comprises the following steps: performing cross-linking reaction on chitosan and a cross-linking agent in an organic acid aqueous solution, and performing freeze drying to obtain a chitosan matrix with a three-dimensional network structure; a pyrrole monomer is uniformly dispersed in a network structure of a chitosan matrix, then the chitosan matrix is immersed in an ammonium persulfate solution, and by controlling the oxidative polymerization degree of ammonium persulfate to the pyrrole monomer, concentration gradient distribution gradually decreasing from the surface to the inside of polypyrrole is formed in the chitosan matrix, so that the polypyrrole / chitosan composite material is obtained. The solar-driven interface evaporation aerogel material based on gradient modification is obtained. The aerogel material provided by the invention combines a photothermal effect with interface evaporation, and achieves the purpose of reasonably and efficiently utilizing solar energy resources to carry out seawater desalination.

The invention provides a flexible electrochemical sensor, a preparation method and application. The flexible electrochemical sensor comprises a flexible substrate, three electrodes, a conductive strip, an external wire and a multi-cavity polypyrrole film, the three electrodes comprise a working electrode, a reference electrode and an auxiliary electrode and are printed on the flexible substrate; the conductive strip is connected with the three electrodes, the conductive strip is packaged through an insulating tape, and only working areas of the three electrodes are exposed; the external wire is pasted on the conductive strip through conductive silver adhesive. The multi-cavity polypyrrole film is modified on the surface of the working electrode. The technical problems that existing equipment is insufficient in portability, cannot meet the requirements of on-site rapid screening and real-time analysis of large-batch samples, and is difficult to realize on-site mobile detection are solved. The invention provides a feasible technical means for portable, mobile and on-site rapid detection of high-harm heavy metal ions such as Hg < 2 + > and Cd < 2 + >, and the method is simple to operate and extremely low in cost.