99 results about "Interfacial polarization" patented technology

The invention relates to the technical field of wave-absorbing materials, in particular to a preparation method of an MXene-NiO-PPy ternary composite wave-absorbing material. The invention provides a preparation method of an MXene-NiO-PPy ternary composite wave-absorbing material, which comprises the following steps of: etching titanium aluminum carbide powder through a LiF / HCl mixture, and performing ultrasonic stripping to prepare a uniform dispersion of MXene nanosheets; the preparation method comprises the following steps: dispersing MXene nanosheets in a solution of water and absolute ethyl alcohol, and adding a pyrrole monomer and a FeCl3. 6H2O aqueous solution for reaction; after the reaction, washing is performed to obtain a PPy-MXene composite material; the preparation method comprises the following steps: by taking NiCl2. 6H2O as a nickel source and sodium oxalate as a precipitator, preparing NiO nanowires by adopting a hydrothermal method combined with a calcining process; the invention discloses a preparation method of an MXene-NiO-PPy ternary composite wave-absorbing material.According to the method, the MXene-NiO-PPy ternary composite wave-absorbing material with rich heterogeneous interfaces and a porous micro-nano structure is constructed, cooperation of dielectric loss, magnetic loss and interface polarization loss is achieved, and finally the light, efficient and broadband wave-absorbing performance is obtained.

The invention discloses an electromagnetic wave absorbing material CoFe2O4 / ZnO-RGO with a ternary heterostructure as well as a preparation method and application of the electromagnetic wave absorbing material CoFe2O4 / ZnO-RGO, and belongs to the technical field of electromagnetic wave absorption. According to the material, a novel heterostructure with a multi-scale interface and a three-dimensional conductive network is constructed by compounding magnetic loss type CoFe2O4, dielectric loss type ZnO nanorods and resistance loss type RGO. Wherein the ZnO nanorod not only serves as a dielectric loss body, but also effectively enhances the structural anisotropy and the interface polarization effect of the material, and cooperates with the magnetic loss of CoFe2O4 and the resistance loss of RGO to jointly optimize impedance matching and improve the electromagnetic attenuation capability, so that the material shows excellent wave-absorbing performance under various thickness and even ultrathin conditions. The material source is wide, the cost is low, the preparation process is green, simple and convenient, the material is suitable for large-scale production, and an effective material solution is provided for electromagnetic wave absorption application in the national defense and civil fields.

The invention relates to the technical field of power system state monitoring, and discloses an insulator defect detection method and device and a storage medium, and the method comprises the steps: collecting the leakage current of an insulator, and constructing a polarity conduction screening model through power frequency phase information, so as to generate a composite current sequence which highlights the polarization attribute of an interface; analyzing the nonlinear degree of the attenuation rate of the sequence drifting along with evolution time in a multi-stage diffusion evolution time domain, and generating an interface electrochemical mass transfer composite index; utilizing the index to invert and construct an interface polarization background reference and stripping the interface polarization background reference from the composite current sequence so as to extract an abnormal discharge pulse residual error; and finally, quantizing the pulse form distortion degree of the residual error, and performing suppression normalization operation on the distortion degree by using the index to output a judgment result. According to the invention, the interference of the interface mass transfer process is effectively eliminated, and the specific detection of the pollution flashover hidden danger is realized.

The invention belongs to the field of wave-absorbing materials, and particularly relates to three-dimensional oriented porous aerogel loaded with yttrium-cobalt nanoparticles as well as a preparation method and application of the three-dimensional oriented porous aerogel. According to the invention, electromagnetic waves are forced to repeatedly refract and scatter through the three-dimensional honeycomb-shaped directional pore channels to have a synergistic effect with multiple heterogeneous interfaces (carbon / Co, carbon / Y2O3 and Co / Y2O3), so that the material synchronously enhances interface polarization, dipole polarization and magnetic-dielectric loss, and efficient attenuation of the electromagnetic waves is realized; by forming an intermediate ZIF-67, highly uniform dispersion of cobalt on a molecular scale is realized, and a subsequent in-situ carbonization process is combined, so that highly dispersed and tightly embedded Co nanoparticles are successfully formed in a chitosan derived carbon skeleton, the interface bonding strength is remarkably improved, and agglomeration is inhibited; according to the process, biomass chitosan is used as a carbon source, and the process has the advantages of low filling, high performance and industrial compatibility. The aerogel-based wave-absorbing material disclosed by the invention has important application value in the fields of communication, aerospace and military protection.

The application provides a hetero-composite wave-absorbing material based on attapulgite, a preparation method and application thereof. The wave-absorbing material is prepared by acid activation and high-frequency ultrasonic stirring to disperse attapulgite in a deionized water system to form an attapulgite emulsion, and the well-dispersed attapulgite fibers are uniformly coated with a carbon layer on the surface through hydrothermal stirring and high-temperature carbonization; then, a flower-like NiCo2O4 is grown in situ on the carbon-coated attapulgite to construct a hetero-interface, the carbon-coated attapulgite is used as a dielectric loss material, the flower-like NiCo2O4 is used as a magnetic loss material, through hetero-structure design, the carbon layer can inhibit the skin effect caused by the cross-linked flower-like NiCo2O4, so as to amplify the magnetic response behavior of the NiCo2O4; the hetero-interface formed between the two can significantly enhance the interface polarization, realize impedance matching, significantly improve the microwave absorption performance, and overcome the defects of impedance mismatch and structure design existing in the prior art magnetic-dielectric synergistic wave-absorbing material.

The invention relates to the technical field of batteries, in particular to a positive plate and a preparation method thereof, a battery and electric equipment. The positive plate comprises a positive current collector and a positive active material layer arranged on one side of the positive current collector, the positive active material layer comprises a first active material layer and a second active material layer which are arranged in a stacked mode, the first active material layer is located between the second active material layer and the positive current collector, the first active material layer comprises LiMnx1Fey1PO4 and LiNia1Cob1Mc1O2, x1 + y1 = 1, a1 + b1 + c1 = 1, and the second active material layer is located between the first active material layer and the positive current collector. M comprises at least one of Mn, Al, Zr and Ti; the second active material layer comprises LiMnx2Fey2PO4 and LiNia2Cob2Mc2O2, x < 2 > + y < 2 > = 1, a < 2 > + b < 2 > + c < 2 > = 1, and M'comprises at least one of Mn, Al, Zr and Ti; the ratio of the mass content of Fe to the mass content of Co in the first active material layer is different from the ratio of the mass content of Fe to the mass content of Co in the second active material layer. According to the positive plate, micro-interface polarization can be improved, and the risk of local lithium precipitation caused by uneven charge distribution is reduced.

The application provides a method for calculating interface polarization charge and current distribution based on reflection coefficient, and relates to the technical field of computational electromagnetics. The method comprises the following steps: establishing a reflection coefficient-dielectric parameter mapping, directly correlating the reflection characteristics of electromagnetic waves with the intrinsic parameters of the medium through a reflection coefficient formula, and laying a physical foundation for polarization analysis; interface electromagnetic field reconstruction, using boundary conditions and constitutive relations to determine the electric field distribution on both sides of the interface and the corresponding polarization intensity. The distribution rule of the electromagnetic field in the medium is determined, the macroscopic electric field is converted into the spatial description of the polarization intensity, and an intermediate variable is provided for charge and current calculation; polarization dynamic response quantification, through the spatial and temporal derivatives of the polarization intensity, the interface polarization charge density and the polarization current density are derived. The theoretical model is converted into actual physical quantities, and the dynamic response mechanism of charges and currents when electromagnetic waves interact with the medium is revealed.

This invention provides a broadband high-temperature resistant ceramic-based microwave absorbing material and its preparation method, belonging to the technical field of microwave absorbing materials. The microwave absorbing material uses silicon carbide powder with a particle size of 100-500 nm as the matrix material. Silicon carbide is mixed with acetylene black and polycarbosilane solution and ball-milled to prepare ceramic slurries containing different concentrations of acetylene black. The ceramic slurries are then poured into a steel mold and vibrated on a vibration table. The sample surface is then smoothed and dried in a vacuum freeze dryer. The dried green sample is then subjected to high-temperature pyrolysis under vacuum and bonded to obtain a silicon carbide ceramic-based composite material. This invention utilizes a concentration gradient multilayer structure to effectively improve the impedance matching of the material. Simultaneously, by utilizing the multiple reflection and scattering effects of electromagnetic waves between silicon carbide and acetylene black, as well as the interfacial polarization loss between silicon carbide and black, broadband high absorption of electromagnetic waves can be achieved under high-temperature conditions.

The invention discloses a low-voltage polarizable magnetic dielectric microsphere, a preparation method thereof and application of the low-voltage polarizable magnetic dielectric microsphere to adsorption of PFASs, and relates to the technical field of environmental functional materials. The microsphere has a core-shell structure of a conductive magnetic core-dielectric shell, the core is composed of ferroferric oxide and a carbon material, and the shell is a sodium alginate gel layer. The preparation method comprises the following steps: calcining the iron-carbon composite material, mixing a sodium alginate solution, cross-linking calcium lactate / calcium chloride step by step and the like. The microspheres can be subjected to interface polarization under the external 0.2-2 V / cm low-voltage direct-current electric field, a strong local electric field is generated to enhance electrostatic adsorption, meanwhile, the mass transfer and adsorption process of PFASs is synergistically enhanced through electrophoresis and electroosmotic flow effects, the adsorption rate and capacity are remarkably improved, and rapid separation can be achieved through a magnetic field. The material and the method are suitable for efficiently and deeply removing anionic PFASs in wastewater, and have the advantages of low energy consumption, high efficiency, simplicity and convenience in operation and the like.

A method for preparing a MOF-based multiphase composite electromagnetic wave absorbing material is disclosed, which relates to the preparation method and application of electromagnetic wave absorbing materials. The purpose of this invention is to solve the problems of poor attenuation and narrow absorption bandwidth in ABO3-type perovskite electromagnetic wave absorbing materials prepared by existing methods. This invention is based on the metallic Fe in MIL-88A. 3+ Ions were successfully induced to form an oxide perovskite phase in MIL-88A via etching, resulting in a hierarchical hollow nanocomposite material. In this structure, the oxide perovskite, a typical spinel-type p-type semiconductor, is composited with the surrounding elemental Fe phase through an outer graphitized carbon shell. Utilizing the heterojunction effect with metal-semiconductor contacts, an excellent interfacial polarization process is generated, significantly enhancing the dielectric loss performance of the composite material. Simultaneously, by consuming excess Fe metal... 3+ Excellent electromagnetic wave absorption performance was obtained by adjusting the impedance matching of the composite material.

The invention discloses an anti-microwave-radiation and anti-blue-light spectacle lens and a preparation method thereof, and belongs to the technical field of optical lenses, the anti-microwave-radiation and anti-blue-light spectacle lens is structurally divided into three layers, namely an anti-blue-light layer, a water-resistant antifouling layer and an anti-microwave-radiation layer from bottom to top in sequence, through a special synergistic relationship among the three layers, the interface bonding is good, and the anti-microwave-radiation and anti-blue-light spectacle lens is not easy to peel off; in addition, good microwave radiation prevention and blue light prevention effects are achieved, oil contamination can be prevented, adhesion of rainwater can be avoided when the waterproof and anti-glare film is used in rainy days, and the sight is prevented from being influenced; the prepared antifouling layer contains pyridine groups, the pyridine groups and cobalt metal ions of the ZIF-8 / ferric oxide composite fibers in the microwave radiation prevention layer can easily form coordinate bonds, pyridine group doping is formed, the dielectric loss angle tangent of ZIF-8 is low, and the consumption efficiency of microwave electric field energy is limited. The doping coordination of pyridine groups can promote the formation of active sites, enhance dipole polarization and interface polarization, and improve the microwave radiation resistance of the microwave radiation resistance layer.

This invention belongs to the field of microwave absorbing materials technology, specifically relating to a composite carbon nanofiber microwave absorbing material, its preparation method, and its applications. The composite carbon nanofiber microwave absorbing material is obtained by electrospinning and heat treatment using a polynuclear pentameric acid metal complex as a precursor and polyacrylonitrile as a carbon source. The polynuclear pentameric acid metal complex is any one of trinuclear iron pentameric acid, dinuclear cobalt pentameric acid, and dinuclear nickel pentameric acid. The excellent microwave absorption performance of the composite carbon nanofiber microwave absorbing material in this invention achieves uniform loading of the nanophase, increases the number of heterogeneous interfaces, and enhances dissipation processes such as interfacial polarization, providing a feasible path to solve the common problems of particle agglomeration and impedance mismatch in composite systems.

The present application relates to the field of high-frequency microwave absorbing material and technology, disclose a kind of multifunctional electromagnetic material with high-frequency electromagnetic absorption and corrosion resistance characteristics and its preparation method and application, the multifunctional electromagnetic material is the core-shell structure with 10-100nm particle size, core is metal magnetic alloy component, shell layer is multilayer graphite carbon;It is obtained by carbonization treatment after dissolving and precipitating of metal salt, surfactant and organic ligand, the magnetic alloy component of core body in material and the graphite carbon matrix of shell layer form conductive network, conducive to the conduction loss caused by electron transition;Mutual hetero-interface is conducive to the interface polarization loss of electromagnetic wave.In addition, magnetic component provides strong magnetic loss, optimizes the impedance matching of wave-absorbing body, further enhances the attenuation ability to electromagnetic wave;And shell layer can effectively prevent the penetration and transmission of various corrosive media on the surface of target matrix, it is a kind of multifunctional electromagnetic material with high-frequency electromagnetic absorption and corrosion resistance characteristics.

The invention provides a PEI-based multilayer dielectric composite film containing an inorganic interlayer and a preparation method and application thereof.The PEI-based multilayer dielectric composite film comprises a first layer body, a second layer body and a third layer body which are sequentially arranged in a stacked mode, the first layer body and the third layer body are polyetherimide films, and the second layer body is a polyetherimide film. And the second layer body is a ceramic fiber layer formed by sodium bismuth titanate nanofibers as an inorganic interlayer. The outer-layer pure PEI film provides a high eta value for the PEI-based multilayer dielectric composite film and ensures high breakdown field strength (Eb); the epsilon r value of the composite film is enhanced by the middle layer through the intrinsic high dielectric constant of the NBTNFs and micro interface polarization existing in the contact area of the NBTNFs and the PEI. The multilayer structure can effectively combine respective advantages of different layers, obtains high dielectric constant, high breakdown field strength and low dielectric loss, has high energy storage density and high energy storage efficiency, and can be suitable for various application fields.

The invention provides a step-by-step modification preparation method of a low-agglomeration electromagnetic wave-absorbing putty composite material, and belongs to the technical field of electromagnetic wave-absorbing putty composite materials. The preparation method comprises the following steps: S1, dispersing a micron-sized magnetic filler in a solvent, and drying to obtain surface-modified magnetic powder, S2, dispersing a nano-carbon conductive material in a modifier solution containing a functional group to obtain a surface-modified conductive filler, and S3, adding the surface-modified conductive filler into an organic putty resin matrix, and uniformly dispersing under a three-roller grinding condition to obtain a composite material, and S4, coating the surface of a base material with the composite material to obtain the electromagnetic wave-absorbing putty composite material with a magnetic / electric dual-loss synergistic effect and an interface dissipation enhancement effect. The electromagnetic wave-absorbing putty material with low agglomeration and uniform dispersion is realized through step-by-step chemical modification of the magnetic and conductive filler, reasonable proportioning and a precise control process, has synergistic absorption of magnetic loss, dielectric loss and interface polarization, and is flat in performance, wide in frequency band and easy to prepare.

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

This invention provides a multi-channel structure for a rapid, highly selective water-voltaic ion sensor, its fabrication method, and its applications. The sensor comprises a multi-channel sandwich-structured fiber membrane, a gradient polarization interface, and an electrode assembly. The multi-channel sandwich-structured fiber membrane includes a first macroporous layer, an intermediate microporous layer, and a second macroporous layer stacked sequentially, dividing the membrane into multiple independent sensing channels on a plane. The gradient polarization interface exhibits different degrees of interface polarization in different sensing channels. The electrode assembly connects to both ends of each sensing channel. The rapid, highly selective water-voltaic ion sensor provided by this invention utilizes a sandwich structure to form ion transport channels with rapid transport at both ends and precise sieving in the middle. This allows for the synergistic enhancement of both rapid ion transport and high-sensitivity response. Furthermore, by constructing differentiated sensing channels with "identical structures but different interfaces," the sensor synergistically amplifies and identifies differences in the intrinsic properties of ions, significantly improving ion selectivity.

The invention discloses a NiCo-C-C / MXene composite material with excellent electromagnetic wave absorption performance and a preparation method of the NiCo-C-C / MXene composite material. According to the material, a multi-component heterogeneous interface engineering strategy is provided, a Prussian blue analogue precursor is coated with polydopamine, MXene is combined, and the NiCo (at) C (at) C / MXene composite material with a layered structure is prepared through high-temperature pyrolysis. Aiming at the problems of organic ligand loss, low carbon content, easy structure collapse, insufficient mechanical strength and conductivity and the like of the traditional PBA derivative material, the method effectively inhibits structural damage at high temperature by introducing a PDA shell layer rich in carbon sources, and meanwhile, a stable conductive network is constructed by utilizing the excellent conductivity of MXene. According to the finally prepared composite material, abundant heterogeneous interfaces and defect sites are constructed among the NiCo nanoparticles, the mixed crystallinity carbon matrix and the MXene layer, and the impedance matching and attenuation capabilities are remarkably optimized through the synergistic effect of interface polarization loss and multiple loss mechanisms.

The invention discloses a conductive hydrogel material and a preparation method thereof, and relates to the technical field of hydrogel materials. The conductive hydrogel material comprises an effective component and water, wherein the mass percentage of each component of the effective component to the total mass of the conductive hydrogel material is as follows: 2.0-7.0 wt% of a hydrogel matrix; 0.2 to 3.0 wt% of a poly (zwitterionic) material; 0.1 to 10.0 wt% of a two-dimensional conductive sheet layer material, preferably 0.5 to 2.5 wt%; 0.2 to 1.5 wt% of a cross-linking agent; wherein the orientation degree index I (002) / I (100) of the two-dimensional conductive sheet layer material in the conductive hydrogel material is 1.4-2.4. According to the conductive hydrogel material, the two-dimensional conductive sheet layer material is oriented in the specific direction, an anisotropic continuous conductive network can be constructed, the continuity of a conductive path is enhanced, interface polarization is reduced, and high-frequency noise suppression and signal-to-noise ratio improvement are achieved at the frequency band of 1-20 kHz.

The application relates to a preparation method and wave-absorbing performance of a rare earth MOF composite FeSi-based soft magnetic alloy; flaky FeSi-based soft magnetic alloy powder is used as a matrix to grow blocky Ce-MOF, the composite material improves interface polarization and magnetic loss performance, enhances multi-level structure interface scattering and reflection, reduces the conductivity of the material, and optimizes the impedance matching of the composite material; when the content of the prepared material is 10wt% and the coating thickness is 1.5mm, the reflectivity is optimized from -9.51dB to -45.60dB; the preparation method is simple, the surface of the flaky FeSi-based soft magnetic alloy wave-absorbing powder is slightly oxidized, the erosion of the FeSi-based soft magnetic alloy matrix can be avoided in the Ce-MOF compounding process, the existence of the oxidation layer improves the stability and corrosion resistance of the material; the introduced rare earth Ce can not only adjust the electromagnetic performance of the material, but also participate in adjusting the crystal structure of the MOF, increases the lattice distortion and defects.

The invention discloses a low-temperature non-volatile interface polarization charge regulation and control method for a lithium niobate / lithium tantalate waveguide device, and aims to solve the problem of process errors of an existing photon chip by taking interface regulation and control as a core means. According to the technical scheme, the method comprises the steps that overall or local low-temperature heat treatment is conducted on a chip where the waveguide device is located, and the heat treatment temperature is far lower than the phase transformation point of a lithium niobate / lithium tantalate material; the low-temperature condition is used for ensuring that no phase change occurs in the material, so that the regulation and control effect is attributed to the change of polarization charges of a lithium niobate-silicon dioxide interface with weak stability or relatively low bond energy; after the heat treatment, the chip is subjected to an aging stabilization process to cure the new non-volatile interface state. According to the method, by means of mild heat treatment, lossless, efficient and nonvolatile regulation and control of the interface polarization charges are achieved. The change of the device performance is used as a key index for proving the interface regulation and control effect.

The application discloses a preparation method of a core-shell structure electrically-driven dielectric elastomer artificial muscle fiber, relates to the technical field of flexible robot driving, and comprises the following steps: preparing BTO nanotubes with high interfacial polarization by means of hydrothermal synthesis and wet chemical method; preparing a polymer mixed solution by taking TPU as a matrix, BDA as a small-molecule polar plasticizing and polarization aid, and the BTO nanotubes as fillers; adopting a continuous solution dipping core-spun method, taking CNT continuous fibers as conductive core wires, continuously coating to form a core-shell structure fiber, and spraying or depositing a conductive polymer electrode layer on the outer layer to obtain the core-shell structure dielectric elastomer artificial muscle fiber. The application realizes the improvement of the dielectric constant of the shell layer and the maintenance of flexibility by synergistically regulating a high dielectric shell layer system, solves the problems that traditional fillers are prone to agglomeration or the poor compatibility between fillers and polymers leads to high loss or mechanical embrittlement, and it is difficult to balance the dielectricity and flexibility, improves the electric displacement efficiency under low and medium pressure conditions, and meanwhile, high elongation and flexibility are maintained.

The invention discloses a preparation method of a hierarchical heterogeneous interface magnetic-dielectric synergistic wave-absorbing material. The preparation method comprises the following steps: carrying out liquid-phase shearing and stripping on expanded graphite to obtain a flaky few-layer graphite dispersion liquid; a nickel-iron layered double hydroxide enrichment micro-area is constructed on the surface and the edge of the nickel-iron layered double hydroxide in situ; a cobalt source precursor and an iron source precursor are introduced, so that CoFe2O4 nanoparticles are preferentially generated in situ on the surface of the enrichment micro-area, and a hierarchical heterogeneous interface regulation and control area with local LLG / LDH / CoFe2O4 in sequential contact is formed. According to the invention, the problems of poor impedance matching and interface disorder caused by direct contact of magnetic particles and a carbon skeleton in the prior art are solved through a sequential control process, and impedance matching optimization, interface polarization enhancement and magnetic-dielectric cooperative loss are realized. When the matching thickness of the obtained composite material is 2.0 mm, the minimum reflection loss reaches-57.2 dB, the effective absorption bandwidth is 5.6 GHz, and the composite material has wide application prospects in the fields of wave-absorbing coatings, structural wave-absorbing patches, anti-electromagnetic radiation fabrics and the like.

The present application relates to the technical field of electromagnetic wave absorbing material, more particularly, to a hydrophobic SiO2 aerogel coating modified magnetic porous carbon wave-absorbing material and a preparation method thereof.The hydrophobic SiO2 aerogel coating modified magnetic porous carbon wave-absorbing material has a layered structure, and the layered structure sequentially comprises a carbon base layer, a magnetic nanoparticle layer and a hydrophobic SiO2 aerogel coating from inside to outside.The thickness ratio of the magnetic nanoparticle layer to the hydrophobic SiO2 aerogel coating is 1:1.5-3.5.The porous network structure of the SiO2 aerogel itself can effectively attenuate electromagnetic waves of a specific frequency band through multiple reflection, interface polarization and relaxation loss mechanisms, and together with the magnetic nanoparticles and the carbon skeleton, a "dielectric loss-magnetic loss-interface loss" three-loss synergistic system is formed to achieve wideband and efficient absorption.

The application discloses a kind of microwave radiation and blue light prevention spectacle lens and preparation method thereof, belong to optical lens technical field, from structure is divided into three layers, from bottom to top in turn is blue light prevention layer, water-resistant and dirt-proof layer and microwave radiation prevention layer, by the special synergy between three layers make its interface well combined, not easy to peel off, and have good microwave radiation and blue light prevention effect, and can prevent oil dirt, when using in rainy day, can avoid the adhesion of rainwater, avoid affecting sight;Pyridine group is contained in the dirt-proof layer prepared by the application, easy to form coordination bond with the cobalt metal ion of ZIF-8 / iron oxide composite fiber in microwave radiation prevention layer, form pyridine group doping, the dielectric loss tangent of ZIF-8 is lower, the energy consumption efficiency of microwave electric field is limited.Pyridine group doping coordination can promote the formation of active site, enhance dipole polarization and interface polarization, improve the microwave radiation prevention performance of microwave radiation prevention layer.

The present invention relates to the field of the preparation of insulation materials for cables, and in particular to a direct current cable using polypropylene insulation, and a manufacturing method therefor. A polypropylene insulation material for the direct current cable provided by the present invention comprises the following components in parts by weight: 100 parts of PP, 5-15 parts of EPDM, and 1-5 parts of nano MgO. By improving the manufacturing process (increasing extrusion pressure and injection molding temperature, and performing stepwise cooling), the present invention mitigates poor dispersibility of EPDM particles on a PP matrix. By means of an EPDM elastomer to which a nanofiller is added, the flexibility and torsion resistance of polypropylene insulation are improved, and the interfacial polarization between the EPDM elastomer and polypropylene is mitigated, thereby ensuring that the electrical properties are also improved while the mechanical properties are improved.

This invention provides a metal-organic framework / solvent-based polyurethane high-dielectric composite material, its preparation method, and its applications, belonging to the field of polyurethane functional composite materials. The composite material of this invention includes: solvent-based polyurethane and a metal-organic framework material; the structural formula of the solvent-based polyurethane is shown in Formula 1, and the metal-organic framework material is KH-570 modified UIO-66 or UIO-66-NH2. This invention utilizes the high polarizability and abundant surface functional groups of UIO-66-type materials to achieve synergistic enhancement of interfacial polarization and dipole polarization. The preparation process does not require high-temperature calcination, is simple to operate, and the resulting composite system exhibits stable dispersion, high dielectric constant, and low dielectric loss, making it widely applicable in flexible electronic devices, dielectric energy storage, electromagnetic shielding, and sensing materials.

The invention discloses a GeP5 / Ge / Fe3O4 / C composite anti-corrosion wave-absorbing material with a multi-shell structure and a preparation method of the GeP5 / Ge / Fe3O4 / C composite anti-corrosion wave-absorbing material, and belongs to the technical field of wave-absorbing materials. According to the composite anti-corrosion wave-absorbing material, GeP5 serves as a core and is sequentially coated with a Ge layer, a Fe3O4 layer and a carbon layer to form a multi-shell structure, the Ge layer regulates dielectric loss to optimize conductivity, the Fe3O4 layer introduces a magnetic loss mechanism, and the carbon layer enhances interface polarization and forms an anti-corrosion barrier. The composite anti-corrosion wave-absorbing material has efficient wave-absorbing performance and long-acting anti-corrosion performance, solves the problems that a traditional wave-absorbing material is single in loss and narrow in effective bandwidth and a phosphorus-based material is poor in environmental adaptability, and has wide application prospects in the fields of military stealth, electromagnetic shielding, ocean engineering and the like.

The invention discloses a metal-coated silicon carbide nanowire wave-absorbing material as well as a preparation method and application thereof, and particularly relates to the field of wave-absorbing composite materials. Comprising a three-dimensional network structure formed by mutually lapping a plurality of silicon carbide nanowires, and the surface of each silicon carbide nanowire is coated with a metal layer; a heterogeneous interface is formed between the silicon carbide nanowire and the metal, and interface polarization is generated on the heterogeneous interface; the effective absorption bandwidth of the wave-absorbing material is 6.48 GHz, and the minimum reflection loss is-41dB; the wave-absorbing material is obtained by performing metal deposition on the surface of the silicon carbide nanowire. The silicon carbide nanowire and the metal layer form a core-shell structure, a heterogeneous interface is formed between the silicon carbide nanowire and the metal layer, interface polarization is generated on the heterogeneous interface, the polarization relaxation process can strongly dissipate electromagnetic wave energy, and therefore the electromagnetic wave absorption performance is improved.