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Preparation method of oxidized graphene phase change microcapsule

A phase change microcapsule, graphene technology, applied in the directions of microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., to achieve the effect of improving heat transfer performance, excellent thermal conductivity, and high thermal conductivity

Inactive Publication Date: 2014-04-30
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method has the advantages of simple operation and low cost

Method used

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  • Preparation method of oxidized graphene phase change microcapsule
  • Preparation method of oxidized graphene phase change microcapsule
  • Preparation method of oxidized graphene phase change microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of Graphene Oxide Cetyl Alcohol Microcapsules

[0042] (1) Preparation of graphene oxide solution.

[0043] Weigh 0.25g of 50um graphite oxide, add 500ml of deionized water, stir for 30min, and sonicate for 3h to prepare a 0.05mg / l graphene oxide solution.

[0044] (2) Preparation of emulsion.

[0045] Weigh 1 g of cetyl alcohol, and add 10 ml of a 0.05 mg / 1 graphene oxide solution. Heating at 80°C, cetyl alcohol melted, stirring for 60min at a stirring speed of 400r / min, and a stable Pickering emulsion was obtained.

[0046] (3) Preparation of microcapsules.

[0047] Add H dropwise to the emulsion 2 SO 4 , Reaction 2h. When the pH value of the system is 2-3, the graphene oxide will condense, and the graphene oxide will completely cover the phase change material emulsion droplets through the force, and will form capsules and precipitate out after cooling.

[0048] The microscope picture of the graphene oxide phase-change capsule prepared by the presen...

Embodiment 2

[0050] Preparation of Graphene Oxide Cetyl Alcohol Microcapsules

[0051] (1) Preparation of graphene oxide solution.

[0052] Weigh 0.5g of 50um graphite oxide, add 500ml of deionized water, stir for 30min, and sonicate for 3h to prepare a 1mg / ml graphene oxide solution.

[0053] (2) Preparation of emulsion.

[0054] Weigh 1 g of cetyl alcohol and add 10 ml of 1 mg / ml graphene oxide solution. Heating at 80°C, cetyl alcohol melted, stirring for 60min at a stirring speed of 400r / min, and a stable Pickering emulsion was obtained.

[0055] (3) Preparation of microcapsules.

[0056] Add H dropwise to the emulsion 2 SO 4 , Reaction 2h. The pH value of the system is 2-3, the graphene oxide is condensed, and the graphene oxide completely covers the emulsion droplet of the phase change material through the force, and is cooled into capsules and precipitated to obtain graphene oxide cetyl alcohol microcapsules.

[0057] The microscope picture of the graphene oxide phase-change c...

Embodiment 3

[0059] Preparation of Graphene Oxide Cetyl Alcohol Microcapsules

[0060] (1) Preparation of graphene oxide solution.

[0061] Weigh 1g of 50um graphite oxide, add 500ml of deionized water, stir for 30min, and sonicate for 3h to prepare a 2mg / ml graphene oxide solution.

[0062] (2) Preparation of emulsion.

[0063] Weigh 1 g of cetyl alcohol and add 10 ml of 2 mg / ml graphene oxide solution. Heating at 80°C, cetyl alcohol melts, stirring for 1 hour at a stirring rate of 400r / min, and a stable Pickering emulsion is obtained.

[0064] (3) Preparation of microcapsules.

[0065] 1ml of H was added dropwise to the emulsion 2 SO 4 , Reaction 2h. The pH value of the system is 2-3, the graphene oxide is condensed, and the graphene oxide completely covers the emulsion droplet of the phase change material through the force, and is cooled into capsules and precipitated to obtain graphene oxide cetyl alcohol microcapsules.

[0066] The microscope image of the graphene oxide phase-c...

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Abstract

The invention relates to a preparation method of an oxidized graphene phase change microcapsule. The preparation method comprises the following steps: dissolving oxidized graphene in water, stirring, performing ultrasound treatment, preparing an oxidized graphene solution; adding a phase change material in the oxidized graphene solution, heating at a temperature higher than a melting point of the phase change material to ensure that the phase change material is melted, stirring to obtain a stable Pickering emulsion of the phase change material wrapped with the oxidized graphene; adding acid in the Pickering emulsion, adjusting the pH value of a system to be 2-3, completing emulsion drops of the phase change material by the oxidized graphene by using an acting force between functional groups to form an oxidized graphene capsule wall; and cooling into a capsule to separate out to obtain the oxidized graphene phase change microcapsule. Compared with the prior art, the oxidized graphene phase change microcapsule has the advantages that the oxidized graphene is used as an emulsifying agent and a heat conducting reinforced wall material, other emulsifying agents need not to be added so that the oxidized graphene phase change microcapsule with better heat conducting material can be obtained. The oxidized graphene phase change microcapsule has the characteristics of high heat conducting coefficient, high heat storage amount, and the like. The preparation method has the advantages of simplicity and convenience in operation, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of graphene nanomaterials and phase-change microcapsules, and in particular relates to a preparation method of graphene oxide phase-change microcapsules. Background technique [0002] Phase change materials absorb or release a large amount of heat during the phase change process, which can realize energy storage, utilization and temperature control. Therefore, it can be widely used in energy-saving energy storage, building materials, aerospace and thermal management and other fields. According to the phase change form, phase change materials can be mainly divided into solid-solid phase change and solid-liquid phase change. Solid-liquid phase change materials are currently the most widely used phase change materials, but they change into liquid phase after melting and have fluidity, so they need to be stabilized before they can be used. In addition, there are some defects in the use of phase change material...

Claims

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Application Information

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IPC IPC(8): B01J13/02C09K5/06
Inventor 张东尚玉刘艳云李秀强
Owner TONGJI UNIV
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