60 results about "Graphene foam" patented technology

According to the preparation method of the graphene heat conduction film or the graphene foam, in the preparation process of the graphene heat conduction film or the graphene foam, a porous graphene oxide film with a surface structure in a fluctuating shape is used as a substrate, graphene oxide slurry is used for immersing the substrate, and then the substrate is flatly coated and integrally dried, so that the graphene heat conduction film or the graphene foam is obtained. And then carrying out heat treatment to prepare the graphene heat-conducting film or graphene foam. The arrangement direction of graphene oxide sheets in the porous graphene oxide film is consistent with the direction of the fluctuating surface structure, and after heat treatment, the porous graphene oxide film has a good in-plane heat conductivity coefficient in the surface direction; graphene sheet layer arrangement orientation consistent with the surface direction of the fluctuating morphology of the porous graphene oxide film is reserved in the finally prepared graphene heat conduction film or graphene foam, and a good longitudinal heat conduction channel is provided for the graphene heat conduction film.

The invention discloses a preparation method and application of a graphene heat-conducting gasket, and relates to the technical field of graphene heat conduction. The invention provides a preparation method of a graphene heat-conducting gasket, the graphene heat-conducting gasket adopts graphene foam as a base material, surface skin removal, laser drilling and trimming, plasma activation treatment and multiple modification treatment are carried out, due to the fact that hydroxyl-rich functional groups are generated on the surface of the graphene through plasma activation treatment, the graphene heat-conducting gasket is prepared through hydroxyl vinyl silicone oil, and the heat-conducting performance of the graphene heat-conducting gasket is improved. A small amount of hydroxyl vinyl silicone oil is uniformly covered on the surface of the graphene, and heating is performed to perform dehydration condensation on the hydroxyl vinyl silicone oil and hydroxyl subjected to plasma activation treatment to form chemical bonds, so that an interface between the graphene and a subsequent adhesive can be tighter, pores at the interface are reduced, and the thermal contact resistance is reduced; the heat transfer efficiency is improved, and the tensile strength and the compression resilience can also be improved.

The invention discloses a wear-resistant and corrosion-resistant PP material for lithium battery packaging and a preparation method thereof, and belongs to the technical field of composites.The wear-resistant and corrosion-resistant PP material is prepared by taking sepiolite-reinforced silicon dioxide aerogel powder as a framework structure, loading polydopamine-coated carbon nanotubes on the surface, and carrying out ammonification reaction on hydroxyl and amino groups on the surface, so that the wear-resistant and corrosion-resistant PP material is obtained. Polydopamine provides a carbon source and a nitrogen source, carbon nanotubes are uniformly loaded on silicon dioxide aerogel and carbonized, graphite-phase carbon nitride grows on the surface, the obtained carbon nitride / graphene foam composite powder is of a three-dimensional network composite structure in the space structure, an interlayer structure of the graphite-phase carbon nitride is interspersed in the carbon nitride / graphene foam composite powder, and the carbon nitride / graphene foam composite powder has a large specific surface area. According to the present invention, the layered structure generates interlayer slippage under the action of the external force so as to disperse the stress and prevent the brittle fracture of the PP material, and the sepiolite-reinforced silica aerogel powder is adopted as the skeleton structure so as to further improve the toughness of the PP material, such that the use safety of the lithium battery is ensured.

The invention provides a process for preparing a three-dimensional graphene foam metal composite material by a biological template method. The preparation method comprises the following steps: preparing through an innovative biological template method process, carrying out carbonization-activation treatment on a natural hierarchical porous biological structure serving as a sacrificial template to form a three-dimensional graphene foam skeleton with bionic hierarchical pore channels, and carrying out in-situ compounding of copper / silver metal nanoparticles through a pulse electrodeposition technology to obtain the composite material. And finally, the three-dimensional graphene foam metal composite material with ultrahigh thermal conductivity and eco-friendly characteristics is constructed. The core breakthrough of the heat-conducting property is as follows: a bionic heat transfer framework is optimized, graded pores derived from a biological template form a phonon efficient transfer path, and the axial heat conductivity is improved by more than 40% compared with that of a material prepared by a traditional chemical foaming method; according to graphene-metal interface cooperation, metal nanoparticles directionally grow on the edge of a graphene sheet layer and hole wall defect sites, and interface thermal resistance is reduced to 8.7 * 10 <-9 > m < 2 > K / W by forming a coherent interface; cross-scale heat flow guide control is achieved, specifically, phonon conduction with the in-plane heat conductivity being 1600 W / (m.K) is achieved through a high-crystallinity graphene domain in a micropore, and an electron conduction heat diffusion network is constructed through a metal filling layer in a macropore channel.

The invention discloses a method for preparing three-dimensional graphene foam from organic silicon waste liquid, the three-dimensional graphene foam and application, and the preparation method comprises the following steps: (1) preheating and evaporating the organic silicon waste liquid to obtain organic silicon waste liquid steam, and mixing the organic silicon waste liquid steam with water vapor to obtain organic silicon waste liquid steam; then hydrolyzing in an inert atmosphere with a carrier gas flow rate of 100-1000 sccm, cooling, filtering to obtain synthesis gas, and passing the synthesis gas through an alkaline substance to obtain purified synthesis gas; (2) introducing the purified synthesis gas into a reaction furnace, carrying out a chemical vapor deposition reaction by taking foamed nickel as a substrate to obtain a three-dimensional graphene foam initial product and hydrogen-rich synthesis gas, and then preparing the hydrogen-rich synthesis gas on the surface of the three-dimensional graphene foam initial product according to the dosage per unit area of 0.2-1.0 mL / cm < 2 >, an anisole solution proppant of polymethyl methacrylate with the mass content of 5%-10% is coated, and then the three-dimensional graphene foam is obtained through acid etching. The three-dimensional graphene foam prepared by the method has excellent conductivity, is suitable for the field of functional materials such as electromagnetic shielding materials, and has a good industrial application prospect.

The invention relates to the technical field of laser micro-nano manufacturing, and discloses a filtering supercapacitor based on nanoparticle-shaped graphene / foam metal and a preparation method thereof, and the preparation method comprises the following steps: preparing a cyanate resin / foam metal composite film by employing foam metal with an open pore structure and a liquid cyanate monomer; carrying out laser processing by adopting an intermediate infrared large-size light spot laser beam and an ultraviolet small-size light spot laser beam, and carrying out in-situ laser induction on the surface of the foam metal to grow the nanoparticle-shaped graphene so as to prepare a nanoparticle-shaped graphene / foam metal electrode raw material; cutting the electrode raw material into an electrode, and attaching a second mask; and preparing an interlayer type filtering supercapacitor. The conductivity of the generated nanoparticle-shaped graphene / foam metal thin film is as high as 909.09 S / cm, the prepared supercapacitor still keeps a relatively good capacitance behavior at a scanning rate of 2500V / s, the phase angle is as high as-70 degrees at 120Hz, the surface specific capacitance is 245 [mu] F / cm < 2 >, and meanwhile, the supercapacitor has a cut-off frequency as high as 3kHz and an RC time constant as low as 0.33 ms.

The invention relates to the field of functional composite materials, in particular to a preparation method of a multi-stage pore broadband wave-absorbing material based on hollow graphene foam / metal organic framework derivation. The broadband wave-absorbing material is formed by compounding macroporous hollow graphene foam and porous carbon derived from a metal organic framework. The preparation method comprises the following steps: firstly, preparing by utilizing a chemical vapor deposition method, and further etching an original nickel framework to obtain the macroporous hollow graphene foam; the preparation method comprises the following steps: preparing a Co / Ni nano-particle-embedded porous carbon composite material, coating the surface of the Co / Ni nano-particle-embedded porous carbon composite material with nano-particles of a ZIF-8-ZIF-67 core-shell structure, carrying out Ni ion exchange to enhance a magnetic coupling network, carrying out high-temperature carbonization evaporation on a Zn core to obtain a Co / Ni nano-particle-embedded porous carbon structure, obtaining a three-dimensional hybrid composite material with a multi-stage pore structure, and carrying out combination packaging to form the ultra-light and broadband wave-absorbing material. The MOF is applied to preparation of radar stealth coatings, electromagnetic shielding devices or 5G communication equipment, and the problems of poor MOF dispersity and insufficient conductive network loss capability are solved.

This invention discloses an apparatus and method for large-scale production of three-dimensional graphene foam with controlled pyrolysis temperature, relating to the field of carbon nanomaterial preparation technology. The apparatus comprises a biomass feed pyrolysis system, a purification system, a chemical vapor deposition (CVD) device, and an outlet gas monitoring system, connected in sequence. This invention primarily addresses the problems of inaccurate pyrolysis temperature control, low single-batch yield, and high energy consumption in existing technologies. On one hand, the outlet gas monitoring system provides real-time feedback on the composition of the tail gas from the CVD process, dynamically and precisely controlling the biomass pyrolysis temperature to directionally control product performance. On the other hand, by designing the nickel foam substrate as a cylindrical or spiral roll, the space of the CVD tube furnace is maximized, significantly increasing the single-batch yield and enabling large-scale production. This invention features a stable process, high efficiency, and low energy consumption, making it suitable for large-scale industrial production of high-performance three-dimensional graphene foam, with broad application prospects in electrochemical energy storage, thermal conductivity, and electrical conductivity.

The invention discloses a heating film and method for heating and drying smoke tea based on graphene far infrared and a heat pump. The heating film comprises a flexible substrate layer, a flexible substrate layer, a flexible substrate layer and a flexible substrate layer which are sequentially arranged from inside to outside, wherein the flexible substrate layer is composed of a polyimide film, the thickness of the flexible substrate layer is 0.1-0.3 mm, and the surface of the flexible substrate layer is provided with a micropore structure; the composite conductive layer is formed by compounding graphene powder and silver nanowires according to the mass ratio of (2-4): 1, and the thickness of the composite conductive layer is 0.02-0.05 mm; the heat-conducting insulating layer is composed of a mixed material of boron nitride nanosheets and polyethylene, and the thickness of the heat-conducting insulating layer is 0.1-0.2 mm; the reflection shielding layer is formed by compounding aluminum foil and polyethylene glycol terephthalate, and the thickness of the reflection shielding layer is 0.05-0.1 mm; the protective coating is composed of fluorinated modified organic silicon resin, and the thickness of the protective coating is 0.01-0.03 mm. The graphene foam heating film has the advantages that the core problems that a traditional heating film is uneven in heat distribution, low in energy efficiency and short in service life are solved, and the graphene foam heating film can be prepared by adjusting the porosity of the graphene foam, the thickness of the conductive layer and other parameters. Various requirements of tobacco leaf drying (high temperature and high humidity), low-temperature dehydration of tea leaves, industrial rapid heating and the like can be met, and the expansibility is high.

The invention relates to the technical field of automobile engines, in particular to a graphene split-flow type methanol fuel instantaneous heating device for a fuel automobile, which comprises a shell and standard interfaces, the standard interfaces are arranged at the upper end and the lower end of the shell, a heating core is arranged in the shell, and the heating core is composed of a plurality of independently controllable partitioned graphene heating structures. The fuel distributor is used for macroscopically distributing fuel; and a three-dimensional graphene foam body is arranged in each graphene heating structure, micropores are formed in each graphene foam body, and the micropores are integrated into a continuous micro-channel network used for microcosmic distribution of fuel. The three-dimensional graphene foam body is adopted as a heating and shunting integrated structure, microscopic shunting and instantaneous body heating of methanol fuel are achieved, and the heating efficiency and the temperature response speed are remarkably improved; the intelligent control unit monitors the fuel flow, the temperature and the engine running state in real time, each heating zone is dynamically opened and closed, the power is adjusted, dual self-adaptive control of mechanical shunting and electronic power adjustment is achieved, and the energy efficiency of the system is improved.

The invention discloses carbon nanotube / graphene composite hyperboloid graphite carbon foam and a preparation method thereof.Carbon nanotubes are introduced into a graphene foam material, and the carbon nanotubes can fix a graphene sheet layer and restrain the characteristic that a graphite crystal sheet layer is prone to sliding under the ultra-high-temperature condition, so that the carbon nanotube / graphene composite hyperboloid graphite carbon foam is obtained; meanwhile, a lattice structure of the graphene material is constructed through high-temperature graphitization, so that the material still has relatively good elasticity and flexibility under an extreme high-temperature condition, the problem of poor elasticity of graphitized carbon foam is solved, and the material can be effectively applied to the field of extreme high-temperature thermal interface materials.

The present invention provides a preparation method for a nickel-iron battery, which specifically includes the following steps: S1, designing a three-dimensional structure, stirring a 3D printing slurry evenly, and then sequentially performing digital light processing printing, degreasing sintering, and high-temperature reduction to obtain a 3D porous nickel template; S2, depositing graphene on the surface of the 3D porous nickel template obtained in step S1, and obtaining nitrogen-doped graphene foam after acid etching and freeze-drying; S3, preparing a positive electrode; S4, preparing a negative electrode; S5, preparing a nickel-iron battery: the positive electrode of the nickel-iron battery obtained in step S3 and the negative electrode of the nickel-iron battery obtained in step S4 are respectively placed in a gel electrolyte for immersion, then taken out, and laminated to each other to obtain a nickel-iron battery. The present invention also provides a nickel-iron battery prepared by the above preparation method. Compared with the prior art, the present invention utilizes the technical advantages of 3D printing and the microscopic porous structure to give the electrode structure flexibility while also giving the nickel-iron battery good flexibility, thereby meeting more application scenarios and actual needs.

The application relates to a preparation method of a graphene-carbon nanotube hybrid oil absorption material, which comprises the following steps: S1, preparing graphene oxide foam; S2, preparing modified graphene oxide foam by using the graphene oxide foam; S3, preparing graphene-carbon nanotube hybrid foam material: placing the prepared modified graphene oxide foam in a tube furnace for heating, meanwhile, argon is introduced into the tube furnace, hydrogen is introduced into the tube furnace, a catalyst is introduced into the tube furnace through a syringe pump, acetylene is introduced into the tube furnace, the acetylene channel and the syringe pump are closed, meanwhile, the temperature control system of the tube furnace is closed, the sample is taken out after cooling to room temperature, and the graphene-carbon nanotube hybrid foam material is obtained; and S4, grafting octadecylamine: preparing an octadecylamine grafting preparation solution, immersing the prepared graphene-carbon nanotube hybrid foam material in the octadecylamine grafting preparation solution, and obtaining the graphene-carbon nanotube hybrid oil absorption material grafted with octadecylamine after freeze drying.

The invention provides a graphene foam preparation method, which comprises: S10, dispersing a graphene oxide filter cake and aramid nanofiber in water to obtain a mixed solution, and coating the mixed solution to form a composite film; s20, drying the composite membrane to remove part of bound water and part of oxygen-containing functional groups so as to obtain an intermediate; and S30, the intermediate is subjected to graphitization treatment, and the obtained graphene foam has high heat conduction performance and anti-stripping performance. The invention also provides the graphene foam prepared by the preparation method and a heater using the graphene foam.

The application provides a highly-oriented graphene heat-conducting film and a preparation method thereof, and belongs to the field of graphene materials. The method comprises the following steps: in the process of drying, an elastic base material coated with graphene oxide slurry is gradually stretched along the length direction of the elastic base material, drying treatment is performed in a stretched state, carbonization and graphitization treatment are performed after the elastic base material is separated, a graphene foam film is obtained, and the graphene foam film is subjected to calendering treatment to obtain the graphene heat-conducting film. The application is characterized in that the graphene oxide film is stretched during the drying process. At this time, the graphene oxide can still be moved in a small range in the solvent, the graphene oxide sheet can be unfolded by external force when being crumpled, the graphene oxide sheet is fixed after the drying is completed, and horizontal high-oriented graphene is obtained after carbonization and graphitization treatment. The method is simple, efficient and convenient for large-scale production.

The utility model relates to a mineral insulated power cable, which comprises a plurality of conductors, a graphene coating and an inner insulating layer are arranged outside each conductor, an outer insulating layer, a metal braided shielding layer, a tensile filling layer, a metal armor layer and an outer sheath are sequentially arranged outside the plurality of conductors, and mineral insulated fillers are arranged between the plurality of conductors and the outer insulating layer. According to the utility model, the outer wall of the conductor is coated with the graphene coating, so that a conductive layer can be formed, electromagnetic interference can be shielded, and the current-carrying capacity and high-voltage impact resistance of the conductor are improved; the inner insulating layer, the mineral insulating filler and the outer insulating layer form three-level insulating protection, so that electric leakage is further prevented; the air pore structure of the graphene foam layer is beneficial to improving the heat dissipation capability of the cable and preventing the current transmission performance of the cable from being reduced due to heat accumulation; the metal armor layer not only can improve the anti-puncture / anti-scratch performance of the cable, but also can increase the overall strength, so that a good protection effect is achieved; the tensile filling layer improves the tensile performance of the cable.

The present invention relates to the technical field of new energy materials, and particularly relates to a graphene foam with single-atom-dispersed in-situ grown nitrogen-doped carbon nanospheres, a preparation method and an application thereof. The graphene foam has carbon nanospheres grown in-situ, and the carbon nanospheres are doped with nitrogen atoms and metal single atoms. The preparation method includes: preparing a graphene foam on the surface of a foam metal template by chemical vapor deposition, and then in-situ growing nitrogen-containing organic nanospheres on the surface of the graphene foam. After calcination and removal of the foam template, a graphene foam with in-situ grown nitrogen-doped and metal single-atom-doped carbon nanospheres is obtained. The obtained composite material is applied to a lithium-sulfur battery, which can greatly improve the utilization rate of active substances and has excellent overall electrochemical performance.

The application discloses a kind of mixing rubber, low-density high-thermal-conductivity graphene foam and preparation method thereof, it is related to heat dissipation material technical field.The raw material of the mixing rubber includes the following components: raw rubber of silicone rubber, MQ resin, white carbon black and modifier.The low-density high-thermal-conductivity graphene foam above described mixing rubber is base material, and includes high proportion modified graphene oxide powder, hydrogen-containing silicone oil, inhibitor, dispersing agent, color paste, foaming agent and catalyst.The mixing rubber is high in mechanical strength, suitable for high proportion filler filling and easy to uniform foaming, using the mixing rubber and other components synergistic design, the graphene foam prepared can simultaneously realize high thermal conductivity coefficient, low density, high tensile strength and excellent foaming uniformity, effectively solve the contradiction between high thermal conductivity filler filling and material mechanical property.

The invention belongs to the field of nickel-zinc batteries, and particularly relates to a nickel-zinc battery negative electrode material based on graphene foam-carbon nanotube-transition metal oxide compounding, a preparation method of the nickel-zinc battery negative electrode material and a nickel-zinc battery. The nickel-zinc battery negative electrode material based on graphene foam-carbon nano tube-transition metal oxide compounding comprises graphene foam, carbon nano tubes growing on the surfaces of pore walls of the graphene foam, and transition metal oxide loaded on a composite matrix formed by the graphene foam and the carbon nano tubes, and a negative active material deposited on the surface of the transition metal oxide. The transition metal oxide is a composite material of cobaltosic oxide and manganese dioxide, and the negative electrode active material comprises metal zinc nanocrystals and zinc oxide nanoparticles. According to the invention, the problems of serious zinc dendrite growth, short cycle life, large self-discharge, poor rate capability, insufficient low-temperature adaptability and the like in the existing nickel-zinc battery are effectively solved, a feasible technical path is provided for high performance and wide application of the nickel-zinc battery, and the nickel-zinc battery has a wide industrialization prospect.

The application discloses a FeCoNiMnAl high-entropy alloy modified graphene foam composite material and a preparation method thereof, wherein the preparation method comprises the following steps: S1, weighing and powdering Fe, Co, Ni, Mn and Al metal element powders according to a molar ratio of 1:1:1:0.5:0.5, ball milling the weighed and powdered metal element powders in a ball milling tank under a protective atmosphere, and uniformly mixing the metal element powders; S2, sieving the uniformly mixed powders to obtain high-entropy powders; S3, uniformly mixing the high-entropy powders and graphene in a magnetic stirrer according to a weight ratio of (1-4):1, and the mixing medium is alcohol; and S4, taking out the obtained mixed powders, and performing suction filtration, drying and sieving to obtain the graphene foam composite material. The electromagnetic wave absorbing material prepared from the FeCoNiMnAl high-entropy alloy modified graphene foam composite material can solve the problem of "impedance mismatch".

The application relates to the field of laser micro-nano manufacturing technology and discloses a filtering super capacitor based on nanoparticle graphene / foam metal and a preparation method thereof, which comprises the following steps: foam metal with an open structure and liquid cyanate ester monomers are used to prepare a cyanate ester resin / foam metal composite film; a laser processing is performed by using a middle infrared large-size light spot laser beam and a ultraviolet small-size light spot laser beam, in-situ laser-induced nanoparticle graphene growth is performed on the surface of the foam metal, and a nanoparticle graphene / foam metal electrode raw material is prepared; the electrode raw material is cut into an electrode, and a second mask is attached; and a sandwich type filtering super capacitor is prepared. The conductivity of the generated nanoparticle graphene / foam metal film is as high as 909.09 S / cm, the prepared super capacitor still has a good capacitance behavior at a scanning speed of 2500 V / s, the phase angle is as high as -70 degrees at 120 Hz, the surface specific capacitance is 245 mu F / cm 2 and simultaneously has a cutoff frequency of up to 3 kHz and an RC time constant as low as 0.33 ms.

The invention belongs to the field of thermal management materials, and particularly relates to a preparation method of high-thermal-conductivity graphene foam with a uniform spherical pore structure. The method comprises the following steps: carrying out ultrasonic dispersion treatment on a graphene oxide solution, uniformly mixing the graphene oxide solution with a polymer microsphere emulsion, and preparing a composite film through an ordered assembly method; then carrying out heat treatment on the composite film, and preparing reduced graphene oxide foam while removing the microspheres; and carrying out graphitization treatment on the reduced graphene oxide foam to obtain the graphene foam with high thermal conductivity. The introduction of the polymer microspheres enables the graphene foam to form a uniform porous structure, and induces a part of graphene sheets to be vertically arranged, so as to form a continuous high-thermal-conductivity network, and at the same time promotes defect repair and grain growth in the graphitization process, so as to significantly improve the thermal conductivity of the graphene foam. The graphene foam prepared by the method disclosed by the invention has the excellent performances of small density, uniform spherical pore structure, low contact thermal resistance, high thermal conductivity, high temperature resistance, adjustable pores and the like.

The invention provides three-dimensional graphene foam, a preparation method thereof and a heat-conducting gasket, and belongs to the technical field of heat-conducting gasket manufacturing. The three-dimensional graphene foam is of a porous structure, the density of the three-dimensional graphene foam is 6.5 g / cm < 3 >-24.5 g / cm < 3 >, and the three-dimensional graphene foam is compact in structure and has excellent structural integrity, so that the heat-conducting gasket corresponding to the three-dimensional graphene foam has small interface contact thermal resistance and high tensile strength.

A method for preparing a graphene thermal conductive pad is referred. Graphene foam sheets are used as base materials for the graphene thermal conductive pad. The graphene foam sheets are processed by surface crust removal, laser perforation and edge trimming, plasma activation, and multiple modification treatments to yield the graphene thermal conductive pad. The plasma activation causes the hydroxyl functional groups to be generated on the graphene surface. By using hydroxyvinyl silicone oil diluted with xylene, a small amount of hydroxyvinyl silicone oil uniformly covers the graphene surface. Heating induces dehydration condensation between the hydroxyvinyl silicone oil and the hydroxyl groups generated by plasma activation, forming chemical bonds. In such a way, a tighter interface between the graphene and the subsequent adhesive is achieved, pores at the interface are reduced, thereby lowering thermal contact resistance, improving heat transfer efficiency, and enhancing tensile strength and compression resilience.

The present invention provides a method for preparing a honeycomb-like multi-layer graphene foam anode material and its application. The method includes graphite pre-oxidation treatment, preparation of multi-layer graphene oxide foam, and preparation method of self-crosslinked honeycomb-like multi-layer graphene foam to obtain the honeycomb-like multi-layer graphene foam anode material. Compared with traditional graphene materials, the number of layers of the honeycomb-like multi-layer graphene foam provided by the present invention is controlled between 10 and 30 layers, which is much higher than the number of layers of graphene. At the same time, the above anode material has a honeycomb-like morphology and combines the energy storage characteristics of both graphene and graphite, so that it can obtain a high energy density during the process of sodium storage and potassium storage.

The application discloses an inorganic hydrated salt / graphene aerogel foam composite phase change energy storage material and a preparation method thereof, and comprises the following steps: 1, mixing ten-water sodium sulfate / lithium nitrate composite salt, sixteen-water lithium iron manganate / calcium sulfate octahydrate composite salt, eighteen-water manganese cadmium titanate / sodium borate hexahydrate and two parts of isosorbide alpha nucleating agent to obtain a mixture A; 2, using polyethylene glycol to modify high-thermal-conductivity graphene nanoparticles; 3, preparing pitch-based carbon fiber reinforced graphene aerogel foam; 4, mixing the mixture A, the polyethylene glycol modified graphene nanoparticles and the pitch-based carbon fiber reinforced graphene foam, adding a mixture of polyethylene glycol diacrylate monomer, dipentaerythritol hexaacrylate and a photoinitiator to obtain a mixture C; and 4, irradiating the mixture C with ultraviolet light to obtain the inorganic hydrated salt / graphene aerogel foam composite phase change energy storage material, so that the supercooling degree of the hydrated salt phase change material is reduced and the phase separation of the hydrated salt phase change material is slowed down.

The present application belongs to the technical field of space electronic equipment energy and heat management, and relates to a heat management system for light-heat-electric energy recovery in a space environment, comprising: a variable-direction dredging structure, a one-way conductive PN junction, a thermoelectric metal power generation structure, a cooling emission nozzle, a graphene foam phase change nanoparticle, a gradient arc-shaped porous capillary core, a liquid collecting support rod, a tracking sun rotating shaft, a battery, a control system, a photovoltaic panel, the one-way conductive PN junction is electrically connected to the battery, the thermoelectric metal power generation structure is electrically connected to the battery, the battery is electrically connected to the tracking sun rotating shaft and the control system, and the control system is electrically connected to the tracking sun rotating shaft; through the variable-direction dredging structure, a multi-stage light-heat-electric conversion system, intelligent heat management and working medium recycling, the present application realizes efficient collection of solar energy, waste heat recycling and system light weight.

The application belongs to the technical field of thermal interface materials, and particularly relates to a graphene foam composite heat-conducting gasket, a preparation method thereof and an electronic device. The composite heat-conducting gasket comprises a graphene foam core body. The preparation process of the graphene foam core body comprises the following steps: after the graphene foam is loaded with nano liquid metal particles, the graphene foam is subjected to nano liquid metal vapor welding treatment in a closed space, so that the nano liquid metal forms metal welding points in situ at graphene sheet layer joint nodes. The graphene foam is used as the core body, the nano liquid metal particles are loaded, and the metal vapor welding treatment is performed in the closed space, so that the nano liquid metal forms the metal welding points in situ at the graphene sheet layer joint nodes, and the structural strength of the graphene foam is significantly improved. Then, the adhesive is coated, and the layers are subjected to heat pressing and compounding, so that an integrated laminated structure is formed. The heat-conducting gasket prepared by the application meets the heat dissipation requirement of high heat flow density electronic devices.

The invention relates to the technical field of heat dissipation, in particular to a heat conduction structure, a preparation method thereof, a packaging structure and electronic equipment. The heat conduction structure comprises a graphene interlayer and two thermal interface layers, the graphene interlayer comprises a plurality of graphene foam layers which are sequentially stacked, and the stacking direction of the graphene foam layers is perpendicular to the thickness direction of the heat conduction structure. In the thickness direction of the heat conduction structure, the two thermal interface layers are arranged on the two sides of the graphene interlayer correspondingly, and the two sides of each graphene foam layer make contact with the two thermal interface layers correspondingly. The multiple graphene foam layers included in the graphene interlayer can form multiple heat conduction channels in the thickness direction of the heat conduction structure, and heat transfer of the heat conduction structure in the thickness direction can be accelerated. The thermal interface layer can realize interface wetting and heat conduction efficiency balance on the two sides of the graphene interlayer, so that the heat conduction structure can be in good contact with other structures, the interface thermal resistance is reduced, and the overall thermal resistance of the heat conduction structure is further reduced.