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Directionally assembled graphene, graphene-carbon nano tube composite heat-conducting film and preparation method thereof

A carbon nanotube composite, carbon nanotube technology, applied in the directions of carbon nanotubes, graphene, nanocarbon, etc., can solve the problems of non-adjustable product thickness, high production cost, low thermal conductivity, etc. The effect of low cost, ultra-high thermal conductivity

Active Publication Date: 2020-05-15
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a new type of heat-conducting film preparation technology for the shortcomings and deficiencies of the existing heat-conducting film, such as high production cost, low thermal conductivity, poor flexibility, and non-adjustable product thickness.

Method used

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  • Directionally assembled graphene, graphene-carbon nano tube composite heat-conducting film and preparation method thereof
  • Directionally assembled graphene, graphene-carbon nano tube composite heat-conducting film and preparation method thereof
  • Directionally assembled graphene, graphene-carbon nano tube composite heat-conducting film and preparation method thereof

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Embodiment 1

[0062] The three-dimensional space overlapping technology of porous graphene: mix graphene oxide: water mass ratio 1:10 evenly, add copper acetate, the mass ratio of copper acetate and graphene oxide solution is 1:100, and mix evenly. The mixed liquid is cooled slowly until the water molecules crystallize into ice, and then moved to a freeze dryer for freeze-drying. The drying temperature is -50°C and the drying time is 24 hours. By controlling the freezing rate, a three-dimensional layered oxidation with parallel layers can be obtained. Graphene, in which copper is evenly distributed between graphene layers. The three-dimensional layered graphene was reduced in a hydrogen atmosphere, the reduction temperature was 300°C, and the reduction time was 2 hours, to obtain copper nanoparticles@three-dimensional layered graphene. Depend on figure 1 It can be seen that the copper nanoparticles are riveted in the layered graphene, and the distance between graphene layers is about 0.05 ...

Embodiment 2

[0067] The three-dimensional space overlapping technology of porous graphene: mix graphene oxide: water mass ratio 1:20 evenly, add copper acetate, the mass ratio of copper acetate and graphene oxide solution is 1:200, and mix evenly. The mixed liquid is cooled slowly until the water molecules crystallize into ice, and then moved to a freeze dryer for freeze-drying. The drying temperature is -50°C and the drying time is 24 hours. By controlling the freezing rate, a three-dimensional layered oxidation with parallel layers can be obtained. Graphene, in which copper is evenly distributed between graphene layers. The three-dimensional layered graphene is reduced in a hydrogen atmosphere, the reduction temperature is 400 ° C, and the reduction time is 2 hours to obtain copper nanoparticles@three-dimensional layered graphene, in which the copper nanoparticles are riveted in the layered graphene, and the graphene layer The pitch is about 0.1 μm.

[0068] In this embodiment, "slowly ...

Embodiment 3

[0072] The three-dimensional space overlapping technology of porous graphene: mix graphene oxide: water mass ratio 1:10 evenly, add ferric chloride, the mass ratio of ferric chloride and graphene oxide solution is 1:100, and mix evenly. The mixed liquid is cooled slowly until the water molecules crystallize into ice, and then moved to a freeze dryer for freeze-drying. The drying temperature is -50°C and the drying time is 24 hours. By controlling the freezing rate, a three-dimensional layered oxidation with parallel layers can be obtained. Graphene, in which the iron element is evenly distributed between the graphene layers. The three-dimensional layered graphene is reduced in a hydrogen atmosphere, the reduction temperature is 400 ° C, and the reduction time is 2 hours to obtain iron nanoparticles@three-dimensional layered graphene, in which the iron nanoparticles are riveted in the layered graphene, and the graphene layer The pitch is about 0.2 μm.

[0073] In this embodime...

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Abstract

The invention relates to a preparation method of directionally assembled graphene. The preparation method comprises the following steps: mixing a graphene oxide aqueous solution and a water-soluble metal salt, slowly cooling until water molecules are crystallized into ice, carrying out a freeze drying treatment to obtain directionally assembled graphene oxide, and reducing to obtain directionallyassembled graphene loaded with metal nano particles. The directionally assembled graphene has a three-dimensional layered structure in which layers are arranged in parallel, an interlayer gap exists between the layers, and metal nano particles are riveted in the three-dimensional layered structure of the directionally assembled graphene. The invention also relates to directionally assembled graphene prepared by the above method. The invention further relates to a graphene-carbon nano tube composite heat-conducting film prepared from the directionally assembled graphene and a preparation methodthereof. The composite heat-conducting film has the advantages of low cost, high graphene phase selectivity, ultrahigh heat conduction coefficient, ultrahigh flexibility, controllable product thickness and the like, and the maximal vertical heat conduction coefficient can reach about 100W / (m.K).

Description

technical field [0001] The invention relates to the technical field of graphene and graphene composite materials. Specifically, the present application relates to an oriented assembled graphene, a preparation method of the oriented assembled graphene, a graphene-carbon nanotube composite heat conduction film and a preparation method of the composite heat conduction film. Background technique [0002] In solid materials, phonons and electrons are the key media for heat transfer. The higher metal thermal conductivity mainly depends on the high-concentration electron transfer process, and among all metals, metallic silver has the highest thermal conductivity (K=429W / (m K)), but this thermal conductivity cannot be used in practical applications. Still not ideal. The thermal conductivity of non-metals mainly depends on the propagation rate of phonons. The thermal conductivity of different elements is quite different. At the same time, different lattice arrangements of the same ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/14C01B32/184C01B32/16
CPCC09K5/14C01B32/16C01B32/184
Inventor 尤勇张慧涛胡黎明郭玉芬刘兆平
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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