407 results about "Silver nanowires" patented technology

Composite materials with noble metal coated silver nanowires loaded into polymer are described. The composite materials may have resistivities of no more than about 100 Ohm-cm, or from about 100 Ohm-cm to about 1×1011 Ohm-cm depending on the amount of noble metal coated silver nanowires loaded into the polymer. The noble metal coated silver nanowires may be platinum coated silver nanowires. Metal particulates such as silver flakes or silver particles may be added to the composite materials in order to obtain desired properties. Composite precursor compositions and methods for preparing the composite materials are described.

The invention relates to the technical field of aerogel, in particular to flexible flame-retardant aerogel and a preparation method thereof.The flexible flame-retardant aerogel is prepared from modified graphene, modified polyvinyl alcohol, silver nanowires, phytic acid and epoxy resin E-51; the furan group is introduced into the aerogel through the modified graphene, the furan group and the maleimide group are subjected to a D-A reaction, an adhesive is prevented from being used when the aerogel is bonded with a screen backboard, the D-A reaction is reversible, and lossless reworking can be realized. PVA and epoxy resin E-51 are added together, so that the heat resistance and mechanical strength of the material are improved. PVA is grafted with a large-steric-hindrance amine group, weak interaction with a furan group is generated, side reaction with an epoxy group of epoxy resin E-51 is avoided, and when aerogel is bonded to an OLED screen backboard, the protective layer is reversibly released, so that D-A reaction can be smoothly carried out. The hydrophobic treatment of the modified graphene and the modified grafting of the polyethylene to the mPEG can effectively improve the agglomeration of the modified graphene and ensure the uniform dispersion of the modified graphene.

According to the flexible sensor for synchronously detecting dynamic and static states and internal conditions of human muscles, dynamic and static force cooperative detection and ultrasonic detection are integrated, and by using the elastic piezoelectric body containing the conductive filler, when the sensor is subjected to compression or stretching deformation, the resistivity and capacitance change greatly. By utilizing the piezoelectric effect and inverse piezoelectric effect of the material, an ultrasonic sensor is compatible with a piezoelectric capacitance type integrated sensor. Flexible electrodes (such as silver nanowires and graphene) and biocompatibility packaging (such as PDMS) are adopted. A time division strategy is adopted, and dynamic and static pressure detection and ultrasonic detection are alternately executed. Based on the technical scheme of the invention, the requirement of realizing accurate monitoring of dynamic force and static force in a full frequency range by using a single flexible sensor is met; the volume and weight of the device are greatly reduced, so that the sensor has good flexibility and wearing comfort, is suitable for physiological monitoring, avoids signal crosstalk and ensures data accuracy.

The invention belongs to the technical field of folding screens, and discloses an optical conductive film for a folding screen and a preparation method thereof.The optical conductive film for the folding screen comprises a composite base material, an interface transition layer, a gradient refractive index optical adjustment layer, a hybrid conductive layer and a scratch-resistant wear-resistant layer which are sequentially stacked from bottom to top; the composite base material is a blending modification layer of polyimide and transparent polyamide, the hybrid conductive layer is formed by compounding silver nanowires, a graphene sheet layer and PEDOT: PSS according to a preset proportion, and the refractive index of the gradient refractive index optical adjustment layer is gradually reduced in the direction away from the composite base material. And the difference value between the refractive index of the gradient refractive index optical adjustment layer and the refractive index of the hybrid conductive layer is not greater than 0.05. The mechanical stability, the light transmission efficiency, the conductive stability, the scratch resistance and the wear resistance of the film are improved, the performance is stable after folding circulation, the use requirements of a folding screen are met, and application in different scenes can be met.

The invention discloses a multi-layer composite shielding PVC wire harness adhesive tape and a preparation method thereof, and relates to the technical field of PVC wire harness adhesive tape, the multi-layer composite shielding PVC wire harness adhesive tape comprises a base material layer, an adhesive layer and a stripping layer, the upper end of the base material layer is provided with a directional electromagnetic shielding layer, the upper end of the directional electromagnetic shielding layer is provided with an aerogel buffer layer, and the upper end of the aerogel buffer layer is provided with an adhesive layer. The directional electromagnetic shielding layer is formed by compounding MXene nanosheets and silver nanowires according to the mass ratio of (1: 0.3)-(1: 1). Polyimide fibers are embedded into pores of the silicon dioxide aerogel in a three-dimensional network structure, so that high buffering property and heat insulation property are realized, the problems that polyurethane foam is poor in heat insulation property and is easy to soften and lose efficacy in a high-temperature environment are solved, and the polyurethane foam is favorably used in an extreme environment and keeps certain stability.

The invention belongs to the technical field of nanometer materials, and designs an ultra-long silver nanowire and a preparation method and application thereof.The raw materials of the preparation method comprise a reducing agent, a solvent, an etching agent and a passivator, a hydrothermal method is adopted, the reducing agent is one or more of glutaraldehyde, butanedialdehyde, adipaldehyde, heptanedialdehyde and octanedialdehyde, the solvent is water, and the etching agent is an organic solvent; the etching agent is soluble metal salt which contains chloride ions and does not contain iron ions; the maximum length of the prepared ultra-long silver nanowire is 185 to 786 m, and the length-diameter ratio of the prepared ultra-long silver nanowire is 1927 to 10077; according to the application, the ultra-long silver nanowire is used for preparing a flexible transparent conductive electrode. According to the method, the separation-free ultra-long silver nanowire can be prepared in a short time, the process is simple, the cost is low, and devices such as transparent conductive electrodes with high light transmittance can be prepared on the flexible substrate.

The invention relates to the technical field of new material detection, in particular to a touch screen production fault detection method based on data feedback, which comprises the following steps of: arranging a transmission spectrum detection device on a flexible touch screen roll-to-roll production line, and continuously monitoring a plurality of layers of films by adopting a U-shaped light path structure to obtain multi-wavelength transmission spectrum data; based on an optical absorption model of each thin film layer, chromatography decoupling operation is carried out on the multi-wavelength transmission spectrum data, and a target spectrum is separated; according to the film temperature monitored in real time, combining a preset material temperature optical constant database and setting a reference light path to carry out temperature compensation and baseline correction on the target spectrum; establishing a silver nanowire agglomeration spectrum model, performing second derivative calculation on the target spectrum after baseline correction, identifying spectrum characteristic peaks, and evaluating the agglomeration degree of the silver nanowires; and judging the degradation defect of the conductive network based on the agglomeration degree of the silver nanowires to obtain a defect detection result, and adjusting process parameters.

The invention discloses low-silver-content composite conductive silver paste based on a three-dimensional conductive network and a preparation method, and relates to the technical field of composite conductive silver paste preparation, and the low-silver-content composite conductive silver paste comprises a low-silver-content conductive phase, an interface bonding layer, a support body and an organic carrier; and the conductive phase with low silver content comprises the following components: 25 wt%-30 wt% of silver-plated hollow glass beads and 12 wt%-18 wt% of a three-dimensional conductive network. According to the invention, through accurate proportioning of the conductive phase with low silver content, the use amount of silver is greatly reduced. The silver-plated hollow glass bead takes light glass as a core and an ultrathin silver layer as a conductive shell, so that the silver consumption is reduced by more than 60wt%; the three-dimensional conductive network adopts a synergistic structure of silver nanowire fragments and graphene composite fragments, and the high conductivity of graphene is utilized to replace part of silver materials, so that the dependency degree of silver is further reduced. The silver content of the silver paste is greatly reduced, the cost of raw materials is greatly reduced, and the economical efficiency of the silver paste in large-scale application scenes such as photovoltaic and electronic packaging is remarkably improved.

The invention discloses a carbon nanotube and silver nanowire co-loaded cotton fabric, a preparation method and application, a pretreated cotton fabric is placed in a silane coupling agent solution, and after soaking treatment, washing and drying are performed to obtain a modified cotton fabric; the preparation method comprises the following steps: acidizing carbon nanotubes, and dispersing the acidized carbon nanotubes in deionized water to obtain acidized carbon nanotube dispersion liquid; the preparation method comprises the following steps: mixing a reducing agent, ferric sulfate, silver nitrate, polyvinylpyrrolidone and water, heating to react, centrifuging, washing, and dispersing a product into deionized water to obtain AgNWs dispersion liquid; the modified cotton fabric is soaked in a CNTs / AgNWs dispersion liquid prepared from the acidified carbon nanotube dispersion liquid and the AgNWs dispersion liquid, and the modified cotton fabric is taken out and dried. The cotton fabric is modified through oxysilane, active groups are introduced to the surface of the fabric, and the binding force of the cotton fabric and a conductive material is enhanced. The surface of the fiber is coated with the carbon nanotubes, the silver nanowires are in lap joint to fill gaps, the carbon nanotubes and the silver nanowires form a continuous and complete conductive network on the surface of the cotton fabric, and the conductivity is improved.

The invention discloses a silver nanowire network film and a welding method, and relates to the technical field of nano material processing and flexible electronic device manufacturing, and the welding method comprises the following steps: taking a polyester film as a substrate, taking silver nanowires, and placing the silver nanowires in ethanol to prepare a silver nanowire dispersion liquid; spin-coating the silver nanowire dispersion liquid on a substrate, and drying to form a silver nanowire network electrode; a focused light scanning system is adopted to weld the silver nanowire film, a xenon lamp light source is adopted to form a light spot through focusing of a convex lens, an XY motor drives a platform to drive a silver nanowire network electrode to perform two-dimensional motion, and the light spot scans a to-be-welded area of the silver nanowire network electrode according to a preset path for welding; and naturally cooling to obtain the silver nanowire network film. Uniformity and stability of current conduction of the electrode network are guaranteed, and comprehensive and efficient node welding is achieved.

The invention belongs to the technical field of low-noise magnetic shielding, and particularly relates to a flexible high-temperature-resistant magnetic shielding film and a preparation method thereof.The preparation method comprises the steps that a PI double-sided tape is attached to one side of a glass slide, and a PTFE / PDMS film is attached to one side of the glass slide to serve as a substrate sprayed by a silver nanometer bundle net; preparing a silver nanowire solution, and spraying the silver nanowire solution on the PTFE / PDMS film by using a spray gun to obtain a silver nano bundle net; spin-coating, curing and transferring the silver nano bundle net to obtain a flexible substrate of the cured silver nano bundle net; according to the flexible high-temperature-resistant magnetic shielding thin film and the preparation method thereof, the characteristic that the silver nanometer bundle net has the electromagnetic shielding performance is utilized, soft magnetic thin films are sputtered on the two sides of the silver nanometer bundle net, the shielding effectiveness of a traditional single-layer shielding thin film is further improved, and the flexible high-temperature-resistant magnetic shielding thin film is obtained. The obtained thin film is light in weight and meets the flexible application requirement of the magnetic shielding thin film, the application space is complex and changeable, and the flexible shielding thin film is light in weight, good in flexibility and excellent in shielding performance.

The invention belongs to the technical field of organic functional materials and organic electronics, and particularly relates to a modified stretchable electrode and a preparation method and application thereof. Silver nanowire dispersion liquid is spin-coated on a substrate, an obtained silver nanowire film is patterned, the obtained patterned silver nanowire film is soaked in a modifier (a small molecule compound containing a group capable of being combined with silver and a hydrogen supply group) for modification, the upper portion of the obtained modified silver nanowire film is coated with an organic polymer solution, and after annealing, the silver nanowire film is obtained. And stripping from the substrate to obtain the modified stretchable electrode. Through the interaction between the modified and enhanced silver nanowire film and the organic polymer, the tensile property is improved, the situation that the sheet resistance of the modified stretchable electrode is increased due to breakage of the silver nanowires is avoided, and the modified stretchable electrode has high conductivity, high transparency and high fatigue resistance at the same time.

The invention belongs to the technical field of conductive ink, and particularly relates to conductive UV ink-jet ink containing silver nanowires and a preparation method of the conductive UV ink-jet ink. According to the preparation method, the carbon nanotubes are subjected to composite modification, silver loading is realized through a heating reduction method, photocuring performance is obtained by means of grafting of dopamine and acrylic acid, and the conductive UV ink-jet ink containing the silver nanowires is prepared by being matched with the modified silver nanowires for common use, so that the conductive UV ink-jet ink containing the silver nanowires is prepared on the basis of ensuring that the ink is dispersed stably and does not generate precipitates; and the conductivity is effectively improved.

Concentrated dispersions of silver nanowires are used to prepare qualitatively distinct silver structures with a range of properties. The concentrated dispersions can have a high weight percent of silver nanowires and can be formulated to be flowable liquids or non-flowing pastes. The concentrated dispersions can be stable with no visible settling over the course of a week, can have non-Newtonian rheology, and can be diluted to a desired weight percent of silver nanowires without detrimental effects on the uniformity of the dispersions. The concentrated dispersions can be formulated with or without polymers or pre-polymer components. The concentrated dispersions can be formulated with silver salts to adjust dispersion of the silver nanowires and to improve electrical conductivity of cured silver structures formed from the dispersions. Methods for forming the concentrated dispersions are described as are methods to form silver structures from the dispersions.

The application discloses a flexible strain sensor with high linearity and low hysteresis, a preparation method and application thereof, and belongs to the technical field of sensors. The composite sensitive material prepared by using an electric spray gun has high linearity and low hysteresis performance. The physical contact between silver nanowires and two-dimensional MXene nanosheets makes the sensor have high sensitivity in a tensile state. Meanwhile, the liquid metal particles as a structural framework have inherent room-temperature low-melting-point characteristics, so that the liquid metal particles are in a liquid state at room temperature, and the gap between the MXene nanosheets and the silver nanowires is reduced. The coordination bond formed between the MXene nanosheets and the liquid metal enhances the interface interaction between the MXene nanosheets and the liquid metal, and reduces energy dissipation. The uniform composite sensing network layer obtained based on a spray mixing technology has a uniform distance between the sensitive materials in the composite sensitive layer with the gradual increase of external stress; and the existence of the buckling structure strengthens the interaction between the sensitive materials. Therefore, the resistance has a linear relationship with the change of the stretching amount, that is, high linearity; and the flexible strain sensor has high sensitivity.

The application discloses a kind of composite flexible transparent electromagnetic shielding film, including substrate, conductive film layer, MXene layer, protective layer in turn;Conductive film layer, MXene layer is arranged with interval;Substrate is PET polyester film, conductive film layer is silver nanowire, MXene layer is two-dimensional sheet MXene with multilayer structure, and protective layer is made of polymethyl methacrylate.The application further discloses a kind of preparation method of composite flexible transparent electromagnetic shielding film and its application in electronic touch screen.The preparation condition of the application is simple, and operability is strong, by regulating the alternate coating layer of silver nanowire layer and MXene layer, the transmittance and shielding effectiveness of electromagnetic shielding film are adjusted, and the more the layer is, the transmittance and shielding effectiveness are gradually smaller.

This invention belongs to the field of silver nanowire spraying technology, and proposes a silver nanowire spraying device and method. A nozzle is installed at the top of the housing via a three-axis moving shaft, employing a multi-degree-of-freedom moving spraying method. Furthermore, a separate housing and air compressor are installed at the bottom of the housing. A raw material storage tank is installed on the housing, and a stirrer is installed on the raw material storage tank. The stirrer agitates the silver nanowire suspension in the raw material storage tank, resulting in a more uniform and stable output silver nanowire suspension. The separate installation of the housing and air compressor avoids the impact of air compressor and stirrer vibrations on the three-axis moving shaft and the heating substrate. Simultaneously, the heating substrate and the nearby heating fan ensure uniform heating of the substrate surface, improving the uniformity and stability of the silver nanowire suspension spraying on the substrate surface.

The invention discloses a silver nanowire and polymer composite transparent conductive film and a preparation method thereof, and belongs to the field of conductive films. According to the preparation method disclosed by the invention, hydroxylation treatment is performed on the surface of AgNWs through ultraviolet irradiation induction to generate a large number of-OH groups, and the-OH groups and sulfonic acid groups (-SO3H) in PEDOT: PSS form chemical bonding, so that the contact resistance between the AgNWs and the PEDOT: PSS is remarkably reduced, and a continuous and efficient conductive network is constructed. Meanwhile, the tight coating structure of hydroxylated AgNWs and PEDOT: PSS effectively inhibits oxidation and ion migration of the silver nanowires in a humid and hot environment, and the stability of the transparent conductive film is remarkably improved.

The invention discloses a nanofiber reinforced polyformaldehyde composite material and a preparation method thereof. The nanofiber reinforced polyformaldehyde composite material comprises the following raw material components in percentage by mass: 55-74% of a polyformaldehyde matrix; 11%-19% of polyketone resin; 5%-10% of a sulfur-free vulcanized elastomer; 8%-15% of a modified compound; 1%-3% of a silver nanowire; the invention relates to the technical field of composite materials. According to the nanofiber reinforced polyformaldehyde composite material and the preparation method thereof, the compound fibers provide an adhesion carrier for the boron nitride nanosheets, the strength of the composite material is improved, a heat conduction network is formed, the composite material has good flame retardance and heat conductivity, the continuity of the heat conduction network is guaranteed in cooperation with the silver nanowires, and the heat dissipation capacity of the composite material is improved; by combining the sulfur-free vulcanized elastomer and the polyketone resin, the elasticity and toughness of the composite material are improved, the notch impact strength is improved, the nanofibers are oriented in an electric field orientation mode, and the tensile strength and bending strength of the composite material are further improved.

The invention discloses a TPU film for robot electronic skin and a preparation method of the TPU film, and relates to the technical field of flexible electronic materials, the film takes TPU introduced with Diels-Alder dynamic reversible bonds as a matrix, a conductive filler is formed by dopamine-modified silver nanowires and MXene, the concentration of the conductive filler is in continuous or quasi-continuous gradient decrease, and the conductive filler is a conductive filler formed by silver nanowires and MXene. An integrated network with self-repairing and environmental stability is formed and is used as an electrode; phase change microcapsules and triboelectric nanofibers are compounded in a low-conductivity contact area to form an intelligent response layer which is self-adaptive in sensing threshold and capable of generating power by friction. Through one-step multi-nozzle electrostatic spinning forming, the problem that self-repairing, signal stability, environmental adaptability and energy independence in electronic skin are difficult to consider at the same time is solved.

The invention belongs to the technical field of flexible sensors, and relates to a flexible underwater pressure sensor and a preparation method and application thereof. The flexible underwater pressure sensor comprises a conductive sensing layer with a pyramid microstructure on the surface, wherein the conductive sensing layer comprises a polydimethylsiloxane thin film with a pyramid microstructure unit and a silver nanowire thin film which is uniformly and conformally attached to the surface of the polydimethylsiloxane thin film; the electrode layer is located on the surface of the side, with the microstructure, of the conductive sensing layer; and the packaging layer is used for performing waterproof packaging on the sensor. The sensor provided by the invention adopts a flexible piezoresistive sensing technology, can work underwater, can at least detect the water depth of 4.5 cm, and has stable response to the water depth of 5mm. Moreover, the preparation process is simple, large-scale preparation can be realized, and the preparation method has a wide application prospect.

The invention relates to the technical field of anti-corrosion coatings, in particular to a nano modified polysiloxane heavy anti-corrosion coating and a preparation method thereof.The nano modified polysiloxane heavy anti-corrosion coating is prepared from, by weight, 100 parts of polysiloxane resin, 5-15 parts of amino silane coupling agent, 20-40 parts of mica iron oxide, 1-5 parts of auxiliaries, 10-30 parts of solvent, 3-10 parts of biomimetic mineralization enhancer and 1-5 parts of additive; the biomimetic mineralization enhancer is prepared through dopamine modification and tetraethoxysilane mineralization treatment of nano diatomite, the compactness, adhesive force and physical shielding performance of the coating are remarkably improved, corrosion medium permeation can be effectively blocked, the additive is prepared from silver nanowires and polyvinylidene fluoride through electrostatic spinning, the coating is endowed with conductivity, and the corrosion resistance of the coating is improved. According to the invention, damage self-sensing and early warning are realized, so that the prepared coating has excellent salt mist resistance, wear resistance, impact resistance and long-acting corrosion resistance, is suitable for metal protection in a harsh corrosion environment, and has a wide application prospect.

The invention relates to a silver nanowire preparation technology, and aims to provide a method for preparing a high-length-diameter-ratio silver nanowire in one step through a solvothermal synthesis reaction. Comprising the following steps: mixing and stirring silver ions and a PVP (Polyvinyl Pyrrolidone) solution, continuously adding bromide ions and chloride ions serving as a nucleating agent, and mixing and stirring to obtain a reaction solution; transferring the reaction solution into a hydrothermal reaction kettle, and reacting under a heating condition to obtain a silver nanowire mother solution; and sediments in the silver nanowire mother liquor are separated and cleaned, and the silver nanowires with the length-diameter ratio being 2148-3190 are obtained. By means of a cooperative regulation mechanism of bromide ions, chloride ions and polyvinylpyrrolidone, the problem that in existing research work, the length and the diameter of the silver nanowire are difficult to consider at the same time is solved, and it is ensured that the length of the silver nanowire is maintained while the diameter of the silver nanowire is reduced; the technological process is simplified, and the problems of nitrogen atmosphere reaction, secondary heating and the like in the prior art are solved; and by optimizing all reaction parameters, stable and controllable preparation of the silver nanowire with the high length-diameter ratio is finally achieved.

The invention belongs to the technical field of preparation of flexible electronic materials, and particularly relates to a preparation method of a flexible synaptic fabric with a pressure sensing function, which comprises the following steps: firstly, preparing raw materials of the flexible synaptic fabric, including a flexible substrate material, a conductive material, a pressure sensitive polymer, a nanocellulose enhancer and a binder; then preparing conductive fibers loaded with silver nanowires and graphene through two-step dipping, and then sequentially dipping and coating a pressure sensitive polymer and a nanocellulose composite binder; a double-face protruding peak type structure is woven through a warp knitting machine, and finally the flexible synaptic fabric with the pressure sensing function is prepared through heat setting and surface modification treatment. The problems that a flexible pressure sensing fabric structure in the prior art is narrow in pressure sensing range and insufficient in sensitivity response interval can be solved.

The invention belongs to the technical field of substance detection, and particularly provides application of a chiral Ag / Bi6S2O15NWs composite film with SERS (Surface Enhanced Raman Scattering) activity in detection of ergothioneine. According to the invention, the silver nanowires are assembled into the thin film by using a Langmuir-Blodgett (LB) technology, and a simpler detection method based on SERS (Surface Enhanced Raman Scattering) is developed. The stability and SERS (Surface Enhanced Raman Scattering) performance of the chiral film are further improved by utilizing the coating of the bismuth-based nanowires (Bi6S2O15NWs). The SERS substrate is used for detecting natural L-amino acid EGT with antioxidant and anti-inflammatory effects, and the detection limit of the SERS substrate is 0.248 mu g / mL. The method provides a novel, efficient and sensitive method for detecting EGT in cosmetics, and supports product development and quality control.

The invention discloses a preparation process of a flexible stretchable surface electromyographic motion sensing integrated electrode, and particularly relates to the field of flexible electronic technology and biomedical engineering.The electrode adopts thermoplastic polyurethane or polydimethylsiloxane as a substrate material, and conductivity and fatigue resistance are improved through doping of graphene quantum dots. The electrode comprises a myoelectricity sensing layer and a motion sensing layer, wherein the myoelectricity sensing layer is constructed through electrostatic spinning of a TPU nanofiber net and spraying of liquid metal, and the motion sensing layer forms a snakelike microcrack structure through silk-screen printing of a silver nanowire / TPU mixed material. The honeycomb-shaped insulating layer is used for isolating bimodal signals, and long-acting antibiosis and air permeability are achieved in combination with the self-repairing adhesion layer. After packaging, a Bluetooth 5.0 chip and a miniature lithium battery are integrated, and wireless signal transmission is supported.

The invention provides an anti-temperature interference core-sheath structure strain sensing fiber and a preparation method thereof, and relates to the technical field of composite materials, the fiber comprises a flexible core layer and a conductive shell layer coating the flexible core layer; wherein the flexible core layer is prepared by mixing thermoplastic polyurethane and DMF (Dimethyl Formamide); the conductive shell layer is prepared by mixing thermoplastic polyurethane, DMF (Dimethyl Formamide), a silver nanowire and a multi-walled carbon nanotube, and the mass ratio of the silver nanowire to the multi-walled carbon nanotube is (0.12-0.15): (0.05-0.1). The excellent temperature interference resistance is realized in a wide temperature range (0-60 DEG C) by regulating silver nanowires with positive resistance temperature coefficients and multi-walled carbon nanotube materials with negative resistance temperature coefficients, the resistance temperature coefficients reach 300 ppm / DEG C, and meanwhile, the fiber is endowed with excellent elasticity by the core-sheath structure. Continuous production is achieved through wet spinning, efficiency is high, and cost is low.

The invention discloses a bacterial cellulose / silver nanowire / MXene composite conductive film and a preparation method thereof, and relates to the technical field of flexible conductive materials. The composite film comprises a bacterial cellulose substrate, an MXene conductive layer and a silver nanowire conductive network layer. The preparation method comprises the following steps: S1, preparing bacterial cellulose dispersion liquid; s2, preparation of an MXene dispersion liquid; s3, preparing a silver nanowire dispersion liquid; and S4, preparing the composite film. The composite film with a Janus structure is prepared through a vacuum-assisted layer-by-layer filtering process, and the composite film has high mechanical performance, low square resistance, excellent electromagnetic interference shielding effectiveness, rapid Joule heating performance and excellent environmental stability and mechanical durability. The problem that an existing flexible electromagnetic shielding material is difficult to consider ultrathin performance, high flexibility, strong mechanical performance and multifunctional integration is solved, and the flexible electromagnetic shielding material has wide application prospects in the fields of electromagnetic shielding, flexible electronic devices, wearable heaters and the like.

The present invention relates to the technical field of nanowire electromagnetic shielding film preparation, and discloses a composite nanowire staggered interconnected electromagnetic shielding film and a preparation process. The S coordinating atoms in a cationic coordination monomer form Cu-S coordination bonds with nano-copper wires, which are adsorbed on the surface of the nano-copper wires to obtain positively charged copper nanowires. The S coordinating atoms in an anionic coordination monomer form Ag-S coordination bonds with nano-silver wires, which are adsorbed on the surface of the nano-silver wires to obtain negatively charged silver nanowires. The amount of positively charged substances on the copper nanowires is greater than the amount of negatively charged substances on the silver nanowires. The silver nanowires and nano-copper wires are electrostatically self-assembled by electrostatic adsorption force to obtain positively charged silver-copper composite nanowires with a staggered interconnected distribution. The silver nanowires are spontaneously deposited on a negatively charged flexible substrate under the action of electrostatic adsorption to obtain a composite nanowire staggered interconnected electromagnetic shielding film. The electromagnetic shielding film exhibits excellent photoelectric properties.

The invention discloses an electrothermal response three-layer hydrogel actuator and a preparation method thereof. The preparation method comprises the following steps: (1) dissolving N-isopropylacrylamide in deionized water, adding polyvinyl alcohol, magnesium lithium silicate, nano silicon dioxide, a cross-linking agent, ammonium persulfate and an initiator, and polymerizing to obtain a poly (N-isopropylacrylamide)-polyvinyl alcohol hydrogel layer; (2) performing hot pressing on the flexible flat cable, the silver nanowire layer and the two polyurethane films to obtain a silver nanowire flexible heater; and (3) rolling the polyimide film, the poly (N-isopropylacrylamide)-polyvinyl alcohol hydrogel layer and the silver nanowire flexible heater to obtain the three-layer hydrogel actuator. The method is simple and easy to operate, and the obtained hydrogel actuator is good in mechanical property, has good, rapid and stable responsiveness to temperature and current, enriches actuating conditions, can play a better role in the fields of underwater robots, holders, valve switches and the like, and is excellent in application prospect.