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Three-dimensional phase-change material based on graphene and preparing method of three-dimensional phase-change material

A phase change material, graphene technology, applied in heat exchange materials, chemical instruments and methods, sustainable manufacturing/processing, etc.

Active Publication Date: 2016-04-20
ZHEJIANG TANGUSHANGXI MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the perfect combination of graphene film and paraffin to prepare excellent composite phase change materials becomes a challenge

Method used

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  • Three-dimensional phase-change material based on graphene and preparing method of three-dimensional phase-change material
  • Three-dimensional phase-change material based on graphene and preparing method of three-dimensional phase-change material
  • Three-dimensional phase-change material based on graphene and preparing method of three-dimensional phase-change material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) The graphene oxide aqueous solution with a concentration of 60 mg / mL was placed in liquid nitrogen and frozen for 3 min, 5 min, 15 min, 30 min, and 35 min, respectively. The frozen graphene oxide gels (a, b, c, d, e) were observed under a scanning electron microscope. The graphene oxide gel a had more sheets and fewer holes; the graphene oxide gel b, c, d The pores are uniform, the degree of density increases sequentially, and the structure of graphene oxide gel e is destroyed.

[0020] (2) Heating the frozen graphene oxide gel to 800°C at a rate of 1°C / min in an inert gas atmosphere, and keeping it warm for 0.5h;

[0021] (3) Raise the temperature to 1300°C at a rate of 3°C / min in an inert gas atmosphere and keep it warm for 0.5h;

[0022] (4) In an inert gas atmosphere, the temperature was raised to 3000°C at a rate of 8°C / min, and kept for 0.5h to obtain graphene airgel;

[0023] (5) Soak the graphene airgel in a dichloromethane solution of paraffin wax with a ...

Embodiment 2

[0025] (1) The graphene oxide aqueous solution with a concentration of 1 mg / mL was placed in liquid nitrogen for 25 min.

[0026] (2) Heating the frozen graphene oxide gel to 800°C at a rate of 1°C / min in an inert gas atmosphere, and keeping it warm for 0.5h;

[0027] (3) Raise the temperature to 1300°C at a rate of 3°C / min in an inert gas atmosphere and keep it warm for 0.5h;

[0028] (4) In an inert gas atmosphere, the temperature was raised to 3000°C at a rate of 8°C / min, and kept for 0.5h to obtain graphene airgel;

[0029] (5) Soak the airgel obtained in step 4 in a paraffin-dichloromethane solution with a concentration of 10g / ml for 5h, and then dry it in a vacuum oven at 30°C to obtain a three-dimensional phase change material based on graphene, filled with paraffin The amount is 70%. Through the differential scanning calorimetry (DSC) test, the melting phase change enthalpy of the graphene-based three-dimensional phase change material is 126.3J / g, and the solidificat...

Embodiment 4

[0031] (1) Place the graphene oxide aqueous solution with a concentration of 100 mg / mL in liquid nitrogen for 25 min.

[0032] (2) The graphene oxide gel after the freezing treatment is heat-treated with the heat treatment methods shown in Table 1 to Table 3 under an inert gas atmosphere,

[0033] (3) Soak the airgel after the heat treatment in step 3 in a paraffin-dichloromethane solution with a concentration of 10 g / ml for 3 hours, and then dry it in a vacuum oven at 30° C. to obtain a graphene-based three-dimensional phase change material.

[0034] Table 1

[0035]

[0036] Table 2

[0037]

[0038] table 3

[0039]

[0040] It can be seen from Tables 1 to 3 that the performance of this material is mainly determined by two aspects. One is the repair of the graphene oxide sheet structure inside the material, that is, the loss of functional groups and the repair of the carbon conjugated structure at high temperature. Second, the continuity of the three-dimensional...

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Abstract

The invention relates to a three-dimensional phase-change material based on graphene and a preparing method of the three-dimensional phase-change material. A graphene oxide aqueous solution with certain concentration is added into liquid nitrogen to be quickly frozen, then graphene oxide aerogel is obtained through freezing drying and is fed into a high-temperature furnace to be subjected to high-temperature heat treatment at 500-3000 DEG C in the inert atmosphere, the treated graphene oxide aerogel is then soaked in dichloromethane solutions with different paraffin concentrations, the product is put into a 30 DEG C vacuum oven to be dried after sufficient absorption, and then the three-dimensional phase-change material based on graphene is obtained. The three-dimensional phase-change material based on graphene is good in paraffin encapsulation effect, the filling amount of paraffin ranges from 0.1% to 99.9%, films and paraffin are uniformly compounded, the melt phase change enthalpy and the solidification phase change enthalpy of the material are basically maintained unchanged after multiple times of heating and cooling circulation, and thus efficient heat energy storage is achieved.

Description

technical field [0001] The invention relates to the field of carbon composite phase change materials, in particular to a graphene-based three-dimensional phase change material and a preparation method thereof. Background technique [0002] Phase-change materials absorb or release heat energy through physical changes caused by temperature changes. Commonly used organic phase change materials have been widely used due to their stable performance, wide phase transition temperature, and adjustable temperature. However, organic phase change materials also have disadvantages such as poor thermal conductivity, large volume expansion coefficient, and easy leakage. [0003] Graphene is a two-dimensional monolayer crystal with the highest strength of known materials, extraordinary specific surface area, and excellent electrical and thermal conductivity. It is currently the most ideal two-dimensional nanomaterial. The macroscopically assembled graphene film fully utilizes the characte...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063Y02P20/10
Inventor 高超王冉彭蠡孙海燕杨清
Owner ZHEJIANG TANGUSHANGXI MATERIAL SCI & TECH
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