7 results about "Graphene foam" patented technology

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 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 application relates to a graphene foam water electrolysis hydrogen evolution electrode and a preparation method thereof. First, graphene foam is prepared by high-temperature graphitization of an oxidized graphene film; then, noble metal is preliminarily loaded on the graphene foam through a solvothermal method; finally, the noble metal loaded on the graphene foam is formed into nanoparticles through high-temperature pyrolysis, so that the graphene foam electrode loaded with noble metal nanoparticles is obtained. The graphene foam electrode loaded with noble metal nanoparticles prepared by the application has excellent catalytic performance, high conductivity, high water electrolysis hydrogen activity and excellent cycle stability. The preparation method technology is simple and easy to implement, green and environmentally-friendly, and can be used for large-scale production. The application is also widely applicable to other energy storage and energy conversion devices, and has a wide application prospect.

The application provides a preparation method of a longitudinal heat conduction enhanced graphene TIM film, comprising the following steps: 1) preparing a graphene oxide film, and opening a plurality of through holes in the thickness direction of the graphene oxide film; 2) soaking the graphene oxide film provided with the through holes into a foaming agent, taking out and drying after reaction, and obtaining a graphene foaming film; 3) taking the graphene foaming film as filter cloth, and filling a carbon fiber mixed slurry into the through holes of the graphene foaming film in a vacuum suction filtration mode until the through holes are completely blocked by the carbon fiber mixed slurry; and 4) performing thermal reduction treatment on the graphene foaming film, and obtaining a longitudinal heat conduction enhanced graphene TIM film. Through the synergistic design of "arrayed punching-directional filling-graphitization", a "carbon fiber-GO" composite heat conduction path distributed along the Z direction (thickness direction) is constructed in the foaming film, and the longitudinal heat conduction performance of the graphene TIM film is improved.

The application relates to the technical field of sand making machines, in particular to a high-efficiency low-noise sand making machine and a use method thereof, which comprises a box body, the surface of the box body is provided with a sound absorption assembly. The application has the advantages of noise reduction and multiple crushing modes. In the actual use process, the introduction of the noise reduction design greatly improves the noise reduction performance. The metal fiber layer one is combined with the nano sound absorption layer one and the nano sound absorption layer two to form a high-efficiency sound absorption structure, sound wave energy is effectively absorbed, the perforated aluminum plate and the graphene foam sound absorption layer further reduce noise, the pleated wall sandwich barrier significantly consumes sound wave energy through multiple reflection and scattering, and finally, the stainless steel skin effectively blocks external noise. This design significantly reduces noise propagation and reflection, provides excellent sound insulation effect for the box body, effectively reduces the noise level, and creates a more quiet and peaceful working environment for the operators.

The application discloses a carbon nanotube / graphene composite double-curved graphite carbon foam and a preparation method thereof. The carbon nanotube is introduced into the graphene foam material, the carbon nanotube can fix graphene layers under ultra-high temperature conditions, the characteristics of the graphene layers are inhibited from easy slipping, and the lattice structure of the graphene material is constructed through high-temperature graphitization, so that the material still has good elasticity and flexibility under extreme high-temperature conditions. The problem of poor elasticity of the carbon foam after graphitization is solved, and the carbon foam can be effectively applied to the field of extreme high-temperature thermal interface materials.