3563 results about "Liquid metal" patented technology

The invention provides an electromagnetic field composite powder feeding type plasma arc additive manufacturing formability regulation and control method and system, and relates to the technical field of plasma arc additive manufacturing. The flowing direction and speed of liquid metal in a molten pool in the deposition process are regulated and controlled through the target composite electromagnetic field, and the morphology and the internal organization structure of a deposition layer are controlled; in the process of regulating and controlling the liquid metal in the molten pool, process parameters and molten pool dynamic image data in the deposition process are collected in real time, and a pre-trained state recognition model is used for conducting self-adaptive adjustment on the process parameters of a subsequent deposition layer; and after deposition of each layer is completed, a laser scanning system is adopted for measuring the actual geometric size and surface appearance of the deposition layer, deposition manufacturing of the next layer is executed based on the optimized composite electromagnetic field control parameters, the corrected layered slicing data and the process path, and the execution is executed circularly till manufacturing of the whole workpiece is completed.

The invention relates to the technical field of electrolytic refining, and provides an electrochemical device and method for extracting metal from molten salt. The electrochemical device comprises an anode, a cathode, an insulating container, an electrolytic bath and an ultrasonic stirring device. The cathode comprises a conductive part and liquid metal; the insulating container is provided with a containing space, the top side of the containing space is open, the liquid metal is contained in the containing space, and a part of the conductive part is inserted into the liquid metal; the electrolytic bath is provided with a containing cavity used for containing molten salt, the insulating container can be used for being immersed in the molten salt so that liquid metal can make contact with the molten salt, and one part of the anode is used for being inserted into the molten salt; a portion of the ultrasonic stirring device is inserted into the liquid metal for oscillating the liquid metal. The liquid metal is subjected to ultrasonic oscillation in the electrolysis process, so that the possibility that metal dendrites are formed on a reduction product or a high-melting-point alloy layer is formed on the surface of the liquid metal is effectively reduced, the reaction efficiency of electrolytic extraction is improved, and the quality of the extracted reduction product is improved.

The invention relates to the technical field of metal sliding bearings, and provides a liquid metal sliding bearing with high sealing performance, which comprises a mandrel, a graphite sealing assembly, a flange and a shaft sleeve, and further comprises a ternary gallium-based liquid metal and a silicon carbide ceramic coating, wave-shaped check rings are arranged among the multiple graphite rings at intervals, initial contact loads are provided through the wave-shaped check rings, the graphite rings and the flange are tightly attached, static sealing with excellent performance is formed in the static state, and the fit clearance between the mandrel and the shaft sleeve is filled with ternary gallium-based liquid metal. A silicon carbide ceramic coating is plated at the matching position of the mandrel and the flange, and a silicon carbide ceramic coating is also plated at the matching position of the mandrel and the shaft sleeve. By using the graphite ring, the ternary gallium-based liquid metal and the silicon carbide ceramic coating, the liquid metal has good fluidity, so that the interface can be fully filled, the liquid metal is not easy to volatilize, the lubricating effect is better, the friction factor is low, and the wear resistance is better.

The invention relates to the technical field of metal bearings, in particular to a reinforced liquid metal sliding bearing. The enhanced liquid metal sliding bearing comprises a rotor, a stator and liquid metal filled in an assembling gap between the rotor and the stator. The fixed positions of the rotor and the stator are provided with a spiral groove structure, a textured microstructure, an infiltration coating and a sealing coating. By adopting the enhanced liquid metal sliding bearing provided by the invention, the wettability and the wear resistance of a bearing rotating pair can be improved, and the problems of coating falling, wear, poor lubrication and the like of the enhanced liquid metal sliding bearing in a high-vacuum, high-temperature, high-pressure, high-speed and high-load use environment are effectively solved. High-pressure sealing is formed on the gaps between the stator and the rotor and between the limiting rings of the stator and the rotor, the liquid metal is kept in the bearing, the assembled bearing does not need a vacuum environment in the transfer process, meanwhile, external gas is prevented from entering the bearing structure, and the possibility that the liquid metal leaks or gets stuck is reduced.

The invention relates to a composite phase-change film based on liquid metal and PBO fiber and a preparation method thereof, and belongs to the technical field of phase-change material preparation, and the preparation method comprises the following steps: the composite phase-change film comprises a poly (p-phenylbenzobisoxazole) fiber (PBO) base material, a phase-change material and a heat-conducting filler, the phase-change material is composed of phase-change microcapsules (PM) which are prepared by taking polyurethane (PU) as a wall material and organic solid-liquid phase-change materials (OPCMs) as a core material through a Pickering emulsion polymerization method. The prepared PM has a core-shell structure, and leakage of OPCMs is effectively prevented. The PM and the PBO fiber network are combined, so that the dual packaging of the OPCMs is realized, and the leakage of the OPCMs is further prevented. Meanwhile, dispersion and interaction of the OPCMs in a PBO matrix are optimized, and formation of a network structure with a limited domain is promoted. The composite phase change film prepared by the invention has relatively high mechanical properties, remarkable heat conductivity, excellent and stable flexibility and excellent heat storage capacity.

The invention discloses a thick plate welding residual stress numerical prediction method based on heat-fluid-solid multi-field coupling, which combines computational fluid dynamics with a finite element method, and comprehensively considers the flow characteristic and thermodynamic effect of liquid metal. In the CFD, the influence of metal melting, molten pool flowing, surface tension, buoyancy, heat transfer and fluid flowing on the geometric shape and temperature distribution of the weld joint is simulated, in the FEM module, the geometric shape and temperature difference of the weld joint are calculated based on the CFD, residual stress and deformation are further simulated and analyzed in combination with a life-death unit technology, and through the FEM module, the residual stress and deformation of the weld joint are obtained. The forming mechanism of the convex welding seam, the evolution rule of the thick plate welding residual stress and the influence of the geometrical shape on residual stress concentration are systematically researched.

The invention relates to a negative-wear super-wear-resistant current-carrying friction pair material which is a conductive lubricating film which is constructed in situ and stably exists under a current-carrying friction condition, and the current-carrying friction pair material is composed of Ga-based liquid metal, a Mo coating and an Al alloy bolt. Through cooperation of friction pair materials, a friction interface reaction is adjusted to generate a conductive lubricating film, and excellent lubricating and wear-resisting properties are achieved; in a large voltage and current range, the average friction coefficient is always maintained to be 0.25 or below, the existence of the lubricating film enables the surface to present negative wear, and the average negative wear rate is 1.28 * 10 <-6 > mm < 3 > / Nm or above. The obtained material is suitable for application in the field of electric contact industry and provides lubrication and wear protection for the surfaces of mechanical parts.

The invention discloses a method for applying liquid metal as a thermal interface material, and relates to the technical field of thermal management. The liquid metal with high thermal conductivity is selected as a core heat-conducting medium, the liquid metal shows excellent heat-conducting performance at the normal temperature, the gallium-indium-tin alloy with high thermal conductivity is selected as the core heat-conducting medium, the heat-conducting performance of the thermal interface material is remarkably improved, and the heat-conducting performance of the thermal interface material is greatly improved at the normal temperature. The liquid metal shows excellent heat conduction performance and can form an almost unobstructed heat conduction path, so that heat generated by the electronic equipment is quickly transferred to the radiator, in addition, in combination with the intelligent response material layer, the shape memory polymer is subjected to phase change at a specific temperature, the liquid metal is driven to form a closer contact interface, and the heat dissipation efficiency is improved. The interface thermal resistance is further reduced, and the heat conduction efficiency is remarkably improved.

The invention relates to a method for optimizing a liquid metal micro-channel radiator. The method comprises the following steps: determining basic parameters for optimizing the radiator; determining boundary conditions of a micro-channel inlet, and establishing a two-dimensional liquid metal micro-channel radiator model; establishing a topological optimization objective function and constraint conditions according to thermal control index requirements; carrying out material interpolation function definition on the reverse permeability coefficient of the porous medium, the heat conduction coefficient of the material and the specific heat coefficient of the material; carrying out iterative calculation on the two-dimensional liquid metal micro-channel radiator model to obtain an optimized radiator channel configuration; constructing a three-dimensional model of the liquid metal radiator flow channel; comparing an analysis result of the three-dimensional finite element model of the radiator with a heat dissipation index and a flow index, and judging whether a working requirement is met or not; and when the working requirements are met, the liquid metal micro-channel radiator with the most effective corresponding heat dissipation capability is obtained. According to the invention, the power consumption of an external driving system can be reduced, and the corresponding optimal liquid metal micro-channel radiator structure can be obtained.

A multi-scale coupling analysis method for a high-temperature liquid metal and jet water interaction system mainly comprises the following steps as shown in an attached drawing: 1, carrying out geometric modeling and grid division on a liquid metal pool type space, jet water and other pipeline systems, and setting a valve action sequence; 2, setting a coupling boundary, and establishing an IPC communication pipeline; 3, performing steady-state calculation, and mutually providing initial boundaries for overall initialization; 4, a system program is imported into the boundary of the two-dimensional fluid domain, the fluid state in the pipeline under the decompression heating condition is calculated, and boundary information in a result is written into the IPC pipeline; 5, the two-dimensional fluid program reads source items from the system program, thermodynamic parameter distribution of the molten pool is calculated, and boundary information is provided; and 6, judging the action condition of the component at the current moment and repeating the step 4 and the step 5 until the calculation time reaches the end moment. The method provided by the invention can simulate the whole interaction process of liquid metal and jet water and embody the influence of flash evaporation in a critical flow jet boundary and an injection pipeline on jet.

The invention relates to a liquid metal / MXene / sodium alginate / polyacrylamide composite hydrogel material as well as a preparation method and application thereof. The hydrogel material comprises liquid metal microspheres, a hierarchical porous network formed by sodium alginate and polyacrylamide, and flaky MXene. The preparation method comprises the following steps: S1, adding liquid metal into an aqueous solution, and carrying out ultrasonic dispersion to obtain dispersion liquid; s2, adding the dispersion liquid into a sodium alginate solution, and performing ultrasonic treatment to obtain a sodium alginate-coated liquid metal aqueous solution; s3, acrylamide is dissolved in deionized water, then the aqueous solution of the liquid metal wrapped by sodium alginate is added, then a cross-linking agent, an initiator and MXene are added, and the mixture is stirred to be uniform; and S4, pouring into a mold, and heating to form the hydrogel. The composite hydrogel material prepared by the invention has the advantages of high stretch rate, strong electromagnetic shielding performance and the like, and can be used as electronic skin for electromagnetic shielding, human health monitoring, man-machine communication and soft robots.

A slidable current collector has an array of terminals with carbon brushes for contacting conductor rails to deliver electrical power to a moving work machine. The terminals have upper sections with a conductive post, lower sections that include a reservoir of liquid metal, and bladders that connect the upper sections with the lower sections. Magnets surround outer shells of the terminals. Fluid above a threshold pressure fed into the bladders holds the upper sections apart from the lower sections and forces the magnets away from the conductor rails. Fluid below the threshold pressure allows the magnets to clamp the terminals to the conductor, lowers the conductive post into the liquid metal, and urges the carbon brushes against the conductor rails. The bladders provide a fluid suspension distributed across the array of terminals, enabling consistent electrical contact and wear for the carbon brushes.

The invention discloses high-strength concrete and a preparation method thereof in the field of concrete. The high-strength concrete is prepared from the following raw materials in parts by weight: superfine sulphoaluminate cement; coarse aggregate; quartz sand; silica fume; coal ash; nano metakaolin; silicon carbide whiskers; a graphene oxide; a pH responsive microcapsule; coating the steel fibers with liquid metal; a carbon nanotube; and a polycarboxylic acid water reducer. Release of the repairing agent is accurately regulated and controlled by adopting the pH response microcapsule, the interface performance is enhanced by combining with the liquid metal coating steel fiber, and the composite dispersion process of the nano material is optimized. Wherein the environment response efficiency of the microcapsule is remarkably improved through the collaborative design of a calcium oxide-slow release agent system and a methyl methacrylate / acrylic acid copolymerization shell layer; according to the gallium-based liquid metal coating, metallurgical bonding of fibers and a matrix is achieved through the low-melting-point characteristic, and traditional physical bonding limitation is broken through.

The invention belongs to the technical field of heat-conducting materials, and provides liquid metal-based composite heat-conducting silicone grease as well as a preparation method and application thereof. The modified silicone oil, the liquid metal, the heat-conducting auxiliary filler and the hydrophobic fumed silica in a specific ratio are used as main components of the liquid metal-based composite heat-conducting silicone grease, and the liquid metal-based composite heat-conducting silicone grease prepared by the invention has high heat conductivity coefficient (up to 6.05-10.0 W / mk) and low heat resistance (as low as 0.01-0.03 DEG C * cm < 2 > / W), can maintain a good appearance in double-85, high temperature 125 DEG C and temperature cycle aging tests, and has a wide application prospect. Therefore, the structure is suitable for an assembly interface of a power module and a radiator with high-power heat dissipation requirements, and the heat dissipation efficiency is improved.

The disclosure describes a screen window liquid metal pad disposed between two opposing elements of an electronic device so as to provide a thermal pathway for an efficient heat transfer from one element to the other, comprising: a screen window and a liquid metal, wherein the screen window includes a frame with a window and a thermal conductive mesh; wherein the frame includes a top piece and a bottom piece, a peripheral portion of the thermal conductive mesh is fixed between the top and bottom pieces through an adhesive and the remaining portion forms a window screen covering the window of the frame; and wherein the liquid metal fills in and covers at least part of a middle portion of the window screen.

A method of fabricating a wearable and elastically stretchable thermoelectric generator or other thermoelectric device can involve arranging thermoelectric pellets and printing a thermal insulation material alongside and / or around the thermoelectric pellets to form a core layer. The core layer can be cured, and a liquid metal can be selectively deposited on the thermoelectric pellets to form contact points. Printing conductive ink can form stretchable electrical interconnects that define connections among the thermoelectric pellets via the contact points to form an initial middle layer that includes the stretchable electrical interconnects. Printing a thermal interface material may form an initial outer layer positioned between the initial outer layer and an initial side of the core layer to form a layered assembly. The layered assembly may be inverted and receive additional printed layers building away from the core layer, such as an additional interconnect layer and an additional thermal interface layer.

The invention relates to the technical field of flexible materials, in particular to a preparation method of a stretchable wire based on a laser in-situ activated liquid metal composite material. According to the method, firstly, liquid metal is subjected to ultrasonic treatment to obtain liquid metal particles, then the liquid metal particles are fully mixed with a solution of an elastic polymer SEBS to prepare printing ink, then a stretchable wire pattern is prepared by means of the printing ink in combination with laser cutting and laser in-situ activation technologies, and finally, the stretchable wire is prepared through transferring and packaging. According to the method, two self-healing materials, namely liquid metal and SEBS, are utilized to form the composite material, and a technology for activating the liquid metal composite material in situ through laser scanning is provided, so that the defects in the prior art are overcome, and the requirements of flexible electronic devices on stretchable wires are met.

The invention discloses a linkage differential measurement system and method suitable for micro thrust calibration. The system comprises a linkage differential measurement rack, a liquid metal radio frequency coaxial cable connector arranged on the rack, and a mass center precise regulation and control device arranged on the rack. The linkage differential measurement system provides micro-Newton-level micro thrust except environment common-mode noise; the method comprises the following steps: a torsional pendulum inclination angle control module controls a torsional pendulum inclination angle # imgabs0 #; the centroid position deviation calculation module is used for calculating centroid position deviation; judging whether the offset s of the current centroid position is less than 10 [mu] m or not; the mass center position adjusting module is used for adjusting the mass center position; the gravitational wave micro-thrust calibration torsional pendulum solves the problems that the gravitational wave thruster needs to calibrate thrust noise besides calibrating thrust, high rigidity of a coaxial cable can generate interference on motion of the gravitational wave micro-thrust calibration torsional pendulum, and the gravitational wave micro-thrust calibration torsional pendulum has extremely high requirements on sensing precision of mass center regulation and control.

The invention belongs to the technical field of liquid metal coating and infiltration in grinding machining, and particularly relates to a temperature-control ultrasonic composite liquid gallium auxiliary grinding device and method for a micro engine blade, and the device comprises a fluid conveying module, a temperature adjusting module, a machining module, an ultrasonic vibration module and an electromagnetic field generator. Temperature control of liquid gallium is achieved by arranging a microwave cavity and a cooling system, stable supply is guaranteed through inert gas and a liquid gallium conveying pipeline, and uniform coating and ultrasonic vibration infiltration on the surface of the blade of the micro engine are achieved by combining an ultrasonic transduction assembly and a spraying nozzle. The electromagnetic field generator further enhances the adhesion and lubrication effects of the liquid gallium on the grinding wheel and the blades. The defects of insufficient grinding temperature control and lubrication of a traditional grinding wheel are overcome, the grinding temperature rise and the friction coefficient are effectively reduced, thermal damage and surface deformation are avoided, and the machining precision and the surface quality of complex curved surfaces and tenon tooth parts are improved.

The invention discloses a manganese dioxide nanoflower loaded copper-gallium electrocatalytic synthesis ammonia material prepared on the basis of gallium-based liquid metal. Manganese dioxide nanoflowers are synthesized through control of reducibility and surface characteristics of liquid metal, copper ions are anchored through electronegativity of manganese dioxide in an aqueous solution, and meanwhile, the copper gallium catalytic material is generated on the surface of manganese dioxide through in-situ reduction by ingeniously and secondarily utilizing the reducibility of the liquid metal. The thickness of the obtained nanoflower sheet layer is 2-20 nm, the copper-gallium alloy is spherical, and the diameter of the copper-gallium alloy is 20-80 nm. The process is safe, simple to operate and suitable for high-flux preparation. The catalytic material can work under various acid-base systems, and under the conditions that the pH is 13, the C (NO3 <->) is 0.1 M and the potential is-0.5 V vs RHE, the ammonia production rate is 4.75 mgNH3 / (mgcat.h), and the Faraday efficiency can reach 99.36%.

The invention discloses an embedded liquid metal microstructure electrode, a flexible pressure sensor array and a preparation method. The technical problems that an existing flexible pressure sensor array is low in sensitivity, large in crosstalk and the like are solved. Wherein the embedded liquid metal microstructure electrode comprises a first flexible substrate, a first liquid metal layer and a first packaging layer; the lower surface of the first flexible substrate is a plane, and a plurality of micro-cone structures arranged in an array are uniformly distributed on the upper surface of the first flexible substrate; the cone part of each micro-cone structure faces upwards and is flush with the upper surface of the first flexible substrate; the first liquid metal layer covers the upper surface of the first flexible substrate and all the micro-cone structures; the first packaging layer covers one surface, far away from the upper surface of the first flexible substrate, of the first liquid metal layer; meanwhile, the invention further provides a preparation method of the microstructure electrode, a flexible pressure sensor array based on the microstructure electrode and a preparation method of the flexible pressure sensor array, and the flexible pressure sensor array is high in sensitivity and low in crosstalk.

The utility model relates to a flexible wearable liquid metal antenna and wearable electronic equipment, and belongs to the technical field of wearable antennas. Comprising a dielectric substrate, a grounding metal sheet, a feed port metal sheet, a metal floor and an inverted F-shaped groove, according to the dual-band wrist type PIFA antenna, a flexible material PDMS is used as a dielectric substrate, liquid metal EGaIn is used as a radiation material, and the EGaIn is wrapped in a microfluidic channel formed by the PDMS, so that the wearable antenna working at two frequency bands of 2.4 GHz and 5.8 GHz is realized. Compared with a traditional solid metal wearable antenna, the wearable antenna designed on the basis of liquid metal can well receive signals, material fatigue or cracking cannot be caused by repeated bending, and the wearable antenna has high self-repairing capacity and has more advantages in the wearable aspect.

The invention relates to a functional liquid metal-based temperature-responsive hydrogel material and a preparation method thereof, and belongs to the technical field of functional polymer hydrogel materials.The preparation method comprises the following steps that a temperature-responsive hydrogel composite material comprises a hydrophobic association polymer gel and a hydrogel monomer, the hydrophobic association polymer gel comprises a hydrophobic association polymer monomer, a functional filler and an initiator. The functional filler is liquid metal gallium with the edge modified by graphene oxide, and has triple functions: firstly, the functional filler is used as an electrostatic crosslinking node to form a crosslinking network with anionic ionic liquid; secondly, dynamic repair is promoted, and Ga < 3 + > is released to promote dynamic bond recombination. In addition, as a functional filler, the hydrogel is endowed with excellent photo-thermal and electro-thermal conversion performance, and the multi-stimulus response capability is enhanced. The composite material realizes structural assembly by means of hydrophobic association, shows reversible phase change and repeated self-assembly characteristics under various stimuli such as photo-thermal, electric heating, direct heating and the like, and has wide application potential.

The invention relates to a liquid metal reconfigurable metasurface reflection unit and a manufacturing method thereof, and belongs to the technical field of artificial electromagnetic materials. The problems that an existing metasurface reflection unit structure is discrete and limited in regulation state, insufficient in continuous adjustment capacity, narrow in adjustment bandwidth and small in reflection phase shift range are solved. Comprising a flexible substrate, a flexible film, a flexible upper cover plate, a driving control structure and a grounding plate, the flexible upper cover plate, the flexible thin film, the flexible substrate, the grounding plate and the driving control structure are stacked in sequence; a micro-channel array structure and a liquid injection port are arranged on the flexible substrate, the micro-channel array structure comprises a plurality of unit micro-channel structures, the plurality of unit micro-channel structures are communicated through through holes, and each unit micro-channel structure is of a bent cross-shaped structure and comprises a liquid storage tank and four semicircular cross arm channels. The metasurface reflection unit is continuous and reconfigurable in structure and has the advantages of being insensitive to polarization and incident angle and large in reflection phase shift range.

The invention belongs to the technical field of heat exchange, and particularly relates to a liquid metal enhanced heat exchange pipeline which comprises a pipeline body, an auxiliary heat exchange cavity and liquid metal. One end of the auxiliary heat exchange cavity is arranged on the pipeline body, and the other end of the auxiliary heat exchange cavity is far away from the pipeline body; the auxiliary heat exchange cavity is filled with the liquid metal. The auxiliary heat exchange cavity is filled with the liquid metal, and compared with a traditional cooling medium, the liquid metal can transfer heat more quickly by means of the ultrahigh heat conductivity of the liquid metal, the heat resistance is reduced, and the overall heat exchange efficiency is improved. In addition, due to the high thermal conductivity of the liquid metal and the optimized heat exchange structure, efficient heat exchange can be achieved in a more compact space, and the requirement for additional cooling fins or heat exchange assemblies is reduced. And compared with a traditional heat exchanger, the heat exchange power density of unit volume is higher, the heat exchanger is suitable for high-power electronic equipment, spaceflight heat dissipation systems and new energy heat exchange equipment, and the requirements for miniaturization and efficient heat dissipation are met.

The present invention relates to a liquid metal bearing dynamic balance correction system and method applied to the field of CT tube technology. The dynamic balance correction system comprises an air circulation system, a liquid metal bearing system, and a test sensor system. The air circulation system comprises a sealed outer cover, an exhaust fan is arranged on the outer wall of the sealed outer cover, one end of the exhaust fan is connected to a gas circulation channel, and the end of the gas circulation channel away from the exhaust fan is connected to the inside of the sealed outer cover. The dynamic balance correction system of the present invention can effectively avoid the problem that the liquid metal in the bearing reacts with oxygen in the atmosphere, causing the viscosity of the liquid metal to change, and then causing the bearing performance to decrease when performing dynamic balance correction on the liquid metal bearing. The dynamic balance correction system can not only perform dynamic balance correction on the rotor, but also perform dynamic balance correction on the final product structure of the rotor and the stator, thereby greatly improving the accuracy and effect of the dynamic balance correction.

The invention belongs to the technical field of electrode materials, and particularly relates to a flexible liquid metal electrode based on gallium-indium-tin alloy and a preparation method and application thereof.Liquid metal ink is prepared through an ultrasonic method, a screen printing technology is adopted, the liquid metal ink is coated on a flexible substrate, meanwhile, mechanical activation and nanoparticle strategies are introduced, and the flexible liquid metal electrode based on gallium-indium-tin alloy is prepared. The preparation method of the high-performance flexible liquid gold electrode with excellent conductivity and mechanical stability is developed. In the flexible liquid metal electrode based on the gallium-indium-tin alloy, due to the good conductivity and biocompatibility of gallium-based liquid metal, the flexible stretchable conductive electrode based on the gallium-indium-tin liquid metal becomes an ideal wearable flexible device circuit material, and the patterning ability of the gallium-indium-tin liquid metal is further improved. Patterning preparation of the circuit is carried out in a mode of silk-screen printing of the gallium-based liquid metal particles, and the patterned liquid metal circuit with excellent conductivity and flexibility is obtained through mechanical activation.

The invention discloses durable metal gel as well as a preparation method and application thereof, and belongs to the technical field of conductive elastomers and composite materials. The preparation method comprises the following steps that S1, a liquid metal-waterborne polyurethane mixed solution is prepared, specifically, liquid metal and waterborne polyurethane dispersion liquid are mixed and dispersed, and the liquid metal-waterborne polyurethane mixed solution is obtained; and S2, drying treatment is conducted, specifically, the liquid metal-waterborne polyurethane mixed solution is dried, and the durable metal gel is obtained. The durable metal gel disclosed by the invention has both metal-grade electronic conductivity and durability.

A heat radiation structure includes a vapor chamber provided along a surface of a die, a mesh interposed between the die and the vapor chamber, and a liquid metal impregnated in the mesh. In the mesh, a peripheral portion has a higher material density per unit volume than a central portion. In the mesh, the central portion may be formed of a single layer, and the peripheral portion is formed of two layers. The mesh may be a resin material.

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