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Method for preparing composite phase-changing material

A composite phase change material and organic phase technology, applied in the field of preparation of phase change materials, can solve the problems of reducing the thermal conductivity of materials, achieve low cost, expand the application range, and improve the effect of thermal conductivity

Inactive Publication Date: 2009-01-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the phonon scattering generated at the nanoparticle / substrate interface may reduce the thermal conductivity of the material.

Method used

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  • Method for preparing composite phase-changing material
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  • Method for preparing composite phase-changing material

Examples

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Effect test

Embodiment 1

[0030] 1) Synthesis of copper nanowires: Take 12 mL of 0.1 M copper nitrate solution, mix with 360 mL of sodium hydroxide aqueous solution (7 M), then add 6 mL of 99% ethylenediamine, and mix well. Add 0.36mL of 50% (V / V) hydrazine hydrate, mix well and put it in a water bath at 60°C, take it out and cool it after 2 hours. Filter to obtain copper nanowires. Repeat several times to obtain sufficient copper nanowires.

[0031] 2) Preparation of copper nanowire / tetradecyl alcohol composite phase change material: take 0.86g of copper nanowire, add 15mL of acetone, stir magnetically for 1.5 hours, disperse by ultrasonic wave for 0.5 hour, then volatilize the acetone to the remaining 1.5mL, then add 0.60g of ten Tetrol, the above mixture is placed in a 50-degree water bath for ultrasonic dispersion until the acetone is completely volatilized, taken out and cooled to obtain a copper nanowire / tetradecyl alcohol composite phase change material. Which contains copper nanowires 59wt% ...

Embodiment 2

[0046] 1) Synthesis of copper nanowires: Take 12 mL of 0.1 M copper nitrate solution, mix with 360 mL of sodium hydroxide aqueous solution (7 M), then add 6 mL of 99% ethylenediamine, and mix well. Add 0.36mL of 50% (V / V) hydrazine hydrate, mix well and put it in a water bath at 60°C, take it out and cool it after 2 hours. Filter to obtain copper nanowires. Repeat several times to get enough copper nanowires.

[0047] 2) Preparation of copper nanowire / tetradecyl alcohol composite phase change material: take 0.53g of copper nanowire, add 15mL of acetone, magnetically stir for 1.5 hours, ultrasonically disperse for 0.5 hour, then volatilize the acetone to the remaining 1.5mL, then add 1.00g of ten Tetrol, the above mixture is placed in a 50-degree water bath for ultrasonic dispersion until the acetone is completely volatilized, taken out and cooled to obtain a copper nanowire / tetradecyl alcohol composite phase change material. Which contains copper nanowires 34.6wt%

[0048] ...

Embodiment 3

[0051] 1) Synthesis of silver nanowires:

[0052] 1) Dissolve 2.50g of polyvinylpyrrolidone in 62mL of ethylene glycol to obtain a solution with a concentration of 0.36M. The solution was vigorously stirred and refluxed in an oil bath at 160°C for 2 hours.

[0053] 2) Dissolve 0.62g AgNO3 in 30mL ethylene glycol, and add this solution dropwise at a rate of 0.5mL / min to the aforementioned solution while vigorously stirring. After the dropwise addition, it was stirred and refluxed for 1 hour, and then cooled to room temperature.

[0054] 3) Add 10 times the volume of acetone to the above reaction product mixture, let it stand for 24 hours, and discard the upper yellow clear liquid. The lower precipitate was filtered to obtain silver nanowires.

[0055] 2) Preparation of silver nanowire / tetradecyl alcohol composite phase change material: take 1.00g of silver nanowire, add 15mL of acetone, magnetically stir for 1.5 hours, ultrasonically disperse for 0.5 hour, then volatilize th...

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Abstract

The invention relates to a preparation method of the phase change material, in particular to a preparation method of the compound phase change material which has a higher latent heat of phase change and a high thermal conductivity under the solid and the liquid states. The preparation steps are as follows: firstly, metal nanowires are prepared; secondly, the metal nanowires are dispersed into an organic solvent; thirdly, an organic phase change material and the mixture are mixed; fourthly, the mixture is dispersed by ultrasonic under the condition of heating, and the organic solvent is removed. The phase change material prepared by the method has the advantages that the art is simple, the cost is low, and the thermal conductivity of the organic phase change material is enhanced greatly while the latent heat of phase change is maintained, thus the performance of the organic phase change material is improved effectively, and the application scope is greatly developed.

Description

technical field [0001] The invention relates to the preparation of phase-change materials, in particular to a method for preparing composite phase-change materials with relatively high phase-change latent heat and high thermal conductivity in both solid and liquid states. Background technique [0002] Energy is the foundation of human survival and social development. At present, the energy available to people can be divided into two categories: conventional energy and renewable energy. Among them, conventional energy, that is, fossil energy, accounts for the vast majority of energy used by human beings. With the development of human society, people's demand for energy is also growing rapidly. The energy crisis has become one of the most important factors restricting social development. So people have turned their attention to the field of energy saving and renewable energy. Thermal energy storage is an important aspect of this. Phase change materials as the material basis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 孙立贤曾巨澜徐芬赵军宁
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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