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Preparation method of hybrid graphene gel/phase-change heat-conducting composite material

A graphene gel, phase change heat conduction technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of uneven dispersion, easy stacking, etc., achieve good repeatability, improve thermal conductivity, and improve thermal conductivity. The effect of stability

Inactive Publication Date: 2017-05-10
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene as a filler has problems such as uneven dispersion and easy stacking, which limit its application.

Method used

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  • Preparation method of hybrid graphene gel/phase-change heat-conducting composite material
  • Preparation method of hybrid graphene gel/phase-change heat-conducting composite material
  • Preparation method of hybrid graphene gel/phase-change heat-conducting composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Dissolve graphite oxide in water, stir for 60 minutes, and ultrasonicate for 2 hours to prepare a graphene oxide solution with a certain concentration, the concentration range is 4mg / ml;

[0037] (2) Take 50ml of graphene oxide solution and place it in a reaction kettle, and conduct a hydrothermal reaction at 180° C. for 24 hours. After the reaction, the graphene columnar body was taken out, and vacuum freeze-dried for 24 hours using a vacuum freeze dryer to obtain a graphene gel.

[0038] (3) Place hexadecanoic acid as the phase change material and the graphene gel in a vacuum oven for vacuuming. After maintaining under vacuum for 1 hour, heat at 80° C. to melt the phase change material, and take it out after 2 hours. The excess phase change material is filtered out, and the hybrid graphene gel phase change composite material is obtained after the sample is cooled to room temperature.

Embodiment 2

[0040] (1) Dissolve graphite oxide in water, stir for 60 minutes, and ultrasonicate for 2 hours to prepare a graphene oxide solution with a certain concentration, the concentration range is 4mg / ml;

[0041] (2) Take 50ml of graphene oxide solution, add a certain amount of graphene nanosheets (the mass ratio of graphene oxide to graphene nanosheets is 4:1), stir for 30min, and ultrasonicate for 2h to obtain graphene oxide / graphene solution .

[0042] (3) Put it in a reaction kettle, and conduct a hydrothermal reaction at 180° C. for 24 hours. After the reaction, the graphene column was taken out, and vacuum freeze-dried for 24 hours using a vacuum freeze dryer to obtain a hybrid graphene gel.

[0043](4) Place hexadecanoic acid as the phase change material and the graphene gel in a vacuum oven for vacuuming. After maintaining under vacuum for 1 hour, heat at 80° C. to melt the phase change material, and take it out after 2 hours. The excess phase change material is filtered ...

Embodiment 3

[0046] (1) Dissolve graphite oxide in water, stir for 60 minutes, and ultrasonicate for 2 hours to prepare a graphene oxide solution with a certain concentration, the concentration range is 4mg / ml;

[0047] (2) Take 50ml of graphene oxide solution, add a certain amount of graphene nanosheets (the mass ratio of graphene oxide to graphene nanosheets is 2:1), stir for 30min, and ultrasonicate for 2h to obtain graphene oxide / graphene solution .

[0048] (3) Put it in a reaction kettle, and conduct a hydrothermal reaction at 180° C. for 24 hours. After the reaction, the graphene column was taken out, and vacuum freeze-dried for 24 hours using a vacuum freeze dryer to obtain a hybrid graphene gel.

[0049] (4) Place hexadecanoic acid as the phase change material and the graphene gel in a vacuum oven for vacuuming. After maintaining under vacuum for 1 hour, heat at 80° C. to melt the phase change material, and take it out after 2 hours.

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Abstract

The invention relates to a preparation method of a hybrid graphene gel / phase-change heat-conducting composite material. The preparation method comprises the following steps that 1, graphite oxide is taken and dispersed in water and is prepared into an oxidized graphene solution; 2, the oxidized graphene solution obtained in the step 1 is put in a reaction kettle, and hydrothermal reaction and drying are performed to obtain graphene gel; 3, then a solid-liquid organic phase-change material and the graphene gel prepared in the step 2 are put under vacuum condition, heating is performed to remove excessive solid-liquid organic phase-change material, and cooling is performed to obtain the graphene gel / phase-change heat-conducting composite material. Compared with the prior art, the prepared composite material has excellent thermal conductivity, electrical conductivity and thermal stability, the problems of low thermal conductivity, electrical insulation and the like of phase-change energy storage materials existing in the prior art are solved, and the preparation method is simple, low in cost, good in repeatability and the like.

Description

technical field [0001] The invention relates to the technical field of graphene nanocomposite materials, in particular to a method for preparing a hybrid graphene gel / phase-change heat-conducting composite material. Background technique [0002] At present, the energy problem has become a bottleneck restricting the further improvement of human material and spiritual life. During the phase change process, phase change materials can absorb or release heat from the environment, thereby being able to store and release heat energy, effectively improving the utilization rate of energy. Therefore, in recent years, phase change energy storage materials have gradually become a hot spot in energy utilization and material research. It can be widely used in the fields of solar thermal utilization, building energy saving, thermal management and the like. Organic phase change materials have many advantages such as good phase change temperature adaptability, large phase change latent hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 张东尚玉
Owner TONGJI UNIV
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