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Magnetic phase-change nano material and preparation method thereof

A technology of nanomaterials and magnetic phase transitions, applied in the direction of magnetic materials, magnetic objects, magnetic liquids, etc., can solve the problems of poor thermal stability and thermal conductivity, and achieve the effect of improving thermal conductivity, simple preparation method, and mild reaction conditions

Active Publication Date: 2022-01-28
XI AN JIAOTONG UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the wall material is an organic material, which has the problem of poor thermal stability and thermal conductivity under high temperature conditions.
[0004] How to make full use of the phase change latent heat of phase change materials without using encapsulation technology, and at the same time endow them with recovery and separation under magnetic field is a huge challenge

Method used

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  • Magnetic phase-change nano material and preparation method thereof

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preparation example Construction

[0025] A method for preparing magnetic phase-change nanomaterials, comprising the following steps:

[0026] (1) Steps for preparing magnetic graphene oxide (rGO): dissolve graphene oxide (GO), ferric chloride, sodium acrylate and sodium acetate in a mixed solvent of ethylene glycol and diethylene glycol (ethylene glycol / diethylene glycol The alcohol volume ratio is 0.5% to 60%: 1) to obtain a mixed solution;

[0027] Wherein, the mass volume ratio of graphene oxide and mixed solvent is 0.05%~10%wt / v, the mass volume ratio of ferric chloride and mixed solvent is 0.1%~10%wt / v, the mass volume ratio of sodium acrylate and mixed solvent The volume ratio is 1%-15%wt / v, the mass volume ratio of sodium acetate to mixed solvent is 1%-15%wt / v; the volume ratio of ethylene glycol to diethylene glycol is 0.005-0.6:1.

[0028] Then transfer the obtained solution to a stainless steel autoclave lined with Teflon, seal it and heat it at 120-280°C for 4-48h, wash it with ethanol and deionize...

Embodiment 1

[0038] The prepared GO (1% wt / v), ferric chloride (0.8% wt / v), sodium acrylate (4% wt / v) and sodium acetate (4% wt / v) were dissolved in ethylene glycol and di Glycol mixed solvent (ethylene glycol / diethylene glycol volume ratio is 50%:1). The resulting solution was then transferred into a Teflon-lined stainless steel autoclave, which was sealed and heated at 150 °C for 8 h. Wash twice with ethanol and deionized water, and dry in vacuum before use. Disperse the magnetic graphene oxide in water (1% wt / v), add epichlorohydrin (3% wt / v), and react at room temperature for 8 hours to obtain magnetic graphene oxide modified with epoxy groups.

[0039] The epoxy group-modified magnetic graphene oxide was dispersed in water (1% wt / v), 1,22-docosanediol (5% wt / v) was added, and reacted at 50°C for 8h, and then mixed with ethanol and removed The magnetic nanomaterials were obtained after washing with ion water and vacuum drying.

[0040] From figure 1 It can be seen that the particle...

Embodiment 2

[0042] The prepared GO (0.5% wt / v), ferric chloride (0.1%), sodium acrylate (1% wt / v) and sodium acetate (5% wt / v) were dissolved in ethylene glycol and diethylene glycol mixed In solvent (ethylene glycol / diethylene glycol volume ratio is 30%:1). The resulting solution was then transferred into a Teflon-lined stainless steel autoclave, which was sealed and heated at 200 °C for 4 h. Wash 3 times with ethanol and deionized water, dry in vacuum and set aside. Disperse magnetic graphene oxide in DMSO (0.5%), add epichlorohydrin (0.8% wt / v), and react at room temperature for 12 hours to obtain magnetic graphene oxide modified with epoxy groups.

[0043] The epoxy group-modified magnetic graphene oxide was dispersed in DMSO (0.9%wt / v), added 1,12-octadecanediol (30%wt / v), reacted at 80°C for 1.5h, and mixed with ethanol and After washing with deionized water and vacuum drying, the magnetic nanomaterials were prepared.

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Abstract

The invention discloses a magnetic phase-change nano material and a preparation method thereof. The preparation method comprises the steps of dispersing magnetic graphene oxide in a solvent, then adding an epoxy cross-linking agent, and reacting at 25 DEG C for 1-48 hours to obtain epoxy group modified magnetic graphene oxide; and dispersing the epoxy group modified magnetic graphene oxide in a solvent, adding dihydric alcohol with ten carbon atoms or more, and reacting at 25-100 DEG C for 1-48 hours to obtain the magnetic nano material. According to the magnetic phase-change nano material, on the basis that the latent heat of the phase-change material is not reduced basically, the heat conductivity coefficient of the material is increased, and meanwhile, the magnetic phase-change nano material has a recovery and separation function under a magnetic field. The magnetic phase-change nano material prepared by the method can fully exert the heat storage function of the phase-change nano material and has magnetism.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and relates to a magnetic phase-change nano material and a preparation method thereof. Background technique [0002] With the development of science and technology and the progress of society, phase change microcapsules have important applications in many fields, and there is a huge room for development. Although phase change nanocapsules with a core-shell structure (patent numbers: CN201910702765.2 and CN201710332135.1) can prevent the leakage of phase change materials to a certain extent, due to the low thermal conductivity of the shell material, the phase change of the phase change material is seriously hindered. The variable latent heat transfer limits its further application. [0003] In addition, new microcapsules with special functions have become a hot spot for researchers to study. Magnetic phase-change micro / nanocapsules are used as cooling medium (patent number: CN2020102434...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06H01F1/44H01F41/00
CPCC09K5/063H01F1/445H01F41/00
Inventor 孟婧刘雨恒胡浚哲张云龙
Owner XI AN JIAOTONG UNIV
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