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Graphene-cellulose nanocrystalline composite heat-conducting film with bionic structure and preparation thereof

A heat-conducting film and graphene technology, which is applied in the field of graphene-cellulose nanocrystalline composite heat-conducting film and its preparation, can solve the problems of low heat conduction between surfaces and poor mechanical properties, and achieve the effect of improving heat conduction performance and increasing heat conduction channels

Active Publication Date: 2018-07-27
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pure graphene films reported so far still have many shortcomings such as low interfacial thermal conductivity and poor mechanical properties.

Method used

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  • Graphene-cellulose nanocrystalline composite heat-conducting film with bionic structure and preparation thereof
  • Graphene-cellulose nanocrystalline composite heat-conducting film with bionic structure and preparation thereof
  • Graphene-cellulose nanocrystalline composite heat-conducting film with bionic structure and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Using expanded graphite as raw material, the GO aqueous dispersion was prepared by the improved Hummers method; a certain quality of plant material was added to a 1:1 mixed solution of concentrated sulfuric acid and deionized water, heated and hydrolyzed at 65°C for 1.5h, and then added after the heating was stopped. Dilute with deionized water, let it stand overnight, remove the supernatant, centrifuge, dialyze, and sonicate to obtain a CNC solution. The obtained CNC solution and GO aqueous dispersion were mixed at a solute mass ratio of 1:1, diluted, stirred, coated, and dried. The obtained film was annealed and reduced at a high temperature of 1500° C. for 2 hours.

[0029] figure 1 It is a scanning electron microscope photograph of the graphene-cellulose nanocrystalline composite film obtained in Example 1 of the present invention before high-temperature reduction; as can be seen from the figure, CNC is evenly dispersed on the surface of GO, indicating that a good ...

Embodiment 2

[0036] Using expanded graphite as raw material, the GO aqueous dispersion was prepared by the improved Hummers method; a certain quality of plant material was added to a 1:1 mixed solution of concentrated sulfuric acid and deionized water, heated and hydrolyzed at 65°C for 1.5h, and then added after the heating was stopped. Dilute with deionized water, let it stand overnight, remove the supernatant, centrifuge, dialyze, and sonicate to obtain a CNC solution. The obtained CNC solution and GO aqueous dispersion were mixed at a solute mass ratio of 1:4, diluted, stirred, coated, and dried. The obtained film was annealed and reduced at a high temperature of 1500° C. for 2 hours.

Embodiment 3

[0038] Using expanded graphite as raw material, the GO aqueous dispersion was prepared by the improved Hummers method; a certain quality of plant material was added to a 1:1 mixed solution of concentrated sulfuric acid and deionized water, heated and hydrolyzed at 65°C for 1.5h, and then added after the heating was stopped. Dilute with deionized water, let it stand overnight, remove the supernatant, centrifuge, dialyze, and sonicate to obtain a CNC solution. The obtained CNC solution and GO aqueous dispersion were mixed at a solute mass ratio of 4:1, diluted, stirred, coated, and dried. The obtained film was annealed and reduced at a high temperature of 1500° C. for 2 hours.

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Abstract

The invention relates to a graphene-cellulose nanocrystalline heat-conducting film with a bionic structure and preparation thereof. The composite film has a shell-like brick-mud layered structure. A preparation method for the film comprises the following steps: (1) mixing a GO solution with a CNC solution in a certain ratio under stirring, and then successively carrying out coating and drying; and(2) subjecting a film obtained in the step (1) to annealing and reducing at a high temperature to obtain the target product graphene-cellulose nanocrystalline heat-conducting film. Compared with theprior art, the invention has the advantage that the thermal conductivity and electrical conductivity of the graphene film are improved by embedding CNC among layers of graphene through self-assemblingto construct the graphene layered shell-like structure.

Description

technical field [0001] The invention relates to the field of film material preparation, in particular to a graphene-cellulose nanocrystal composite heat-conducting film with a bionic structure and a preparation method thereof. Background technique [0002] The rapid development of industries such as modern aerospace and electronic computers has put forward more and more stringent requirements for the performance of integrated chips. The heat dissipation performance of chips has become an important factor restricting the working efficiency of electronic devices. Therefore, materials with high thermal conductivity have become a hot research topic in the electronics industry. Compared with heat dissipation materials such as metals commonly used today, carbon materials have many advantages such as high thermal conductivity (such as graphite 2000W / mK, diamond 2300W / mK, carbon nanotubes 3500W / mK), light density, and low thermal expansion coefficient, which can replace traditional ...

Claims

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Application Information

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IPC IPC(8): C08J7/00C08J5/18C08L1/02C08K3/04
CPCC08J5/18C08J7/08C08J2301/02C08K3/04
Inventor 朱申敏孟鑫潘辉路涛栾瑞英李尧陈彦儒
Owner SHANGHAI JIAO TONG UNIV
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