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Graphene-silicon dioxide composite wall-material phase-change nanocapsule and preparation method thereof

A nanocapsule and silicon dioxide technology, applied in microcapsule preparations, chemical instruments and methods, microsphere preparation, etc., can solve the problems of inability to form microcapsules, decrease in phase change enthalpy, decrease in phase change enthalpy, etc. The effect of cold phenomenon, thermal conductivity improvement, and thermal conductivity improvement

Active Publication Date: 2018-11-09
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the disadvantage is that with the increase in the amount of thermally conductive fillers, the phase change enthalpy will decrease significantly, and the capsules will agglomerate, and microcapsules cannot be formed when the amount is too large.
Chinese patent CN106957635A uses nano-copper and graphene nano-sheets to improve the thermal conductivity of phase-change microcapsules and suppress supercooling behavior, but high-density copper nanoparticles will lead to a significant decrease in phase-change enthalpy
[0007] In summary, there is no report on the method of introducing high thermal conductivity nanofillers into the wall material of phase change nanocapsules to suppress the supercooling behavior of phase change nanocapsules and improve its thermal conductivity.

Method used

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  • Graphene-silicon dioxide composite wall-material phase-change nanocapsule and preparation method thereof
  • Graphene-silicon dioxide composite wall-material phase-change nanocapsule and preparation method thereof
  • Graphene-silicon dioxide composite wall-material phase-change nanocapsule and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] In a 10 mL sample bottle, add 0.1 g sodium lauryl sulfate, 4 mL deionized water, and 30 mg graphene powder, and then ultrasonically disperse for 30 min to form a stable graphene dispersion.

[0037] In a 100mL beaker, add 2g of n-octadecane, 1g of methyltrimethoxysilane, and 2g of ethyl orthosilicate to form an oil phase after being miscible. Then 0.328 g of cetyltrimethylammonium bromide was added to the oil phase. In another 100mL beaker, add 28.5mL of water and 14.2mL of ethanol in sequence, and make it miscible as the water phase. After the water phase was added to the oil phase and mixed, the mixture was emulsified for 2 minutes with a high-speed shearer at a speed of 13000 r / min to form an oil-in-water emulsion, and then ultrasonicated for 5 minutes to form a stable fine emulsion. The miniemulsion was transferred to a 100 mL round bottom flask and placed in an oil bath at 35 °C. The graphene dispersion was added dropwise into the miniemulsion, and then 2 mL of e...

Embodiment 2

[0040] In a 50 mL sample bottle, add 0.5 g sodium lauryl sulfate, 20 mL deionized water, and 150 mg graphene powder, and then ultrasonically disperse for 1 h to form a stable graphene dispersion.

[0041] In a 500mL beaker, add 10g of n-octadecane, 5g of methyltrimethoxysilane, and 10g of ethyl orthosilicate to form an oil phase after being miscible. Then 1.64 g of cetyltrimethylammonium bromide were added to the oil phase. In another 500mL beaker, add 142.5mL of water and 71mL of ethanol in sequence, and use it as the water phase after being miscible. After the water phase was added to the oil phase and mixed, the mixture was emulsified by a high-speed shearer at a speed of 13000r / min to form an oil-in-water emulsion, and then ultrasonicated by an ultrasonic breaker for 10 minutes to form a stable fine emulsion. The miniemulsion was transferred to a 500 mL round bottom flask and placed in an oil bath at 35 °C. The graphene dispersion was added dropwise into the miniemulsion...

Embodiment 3

[0043] In a 50mL sample bottle, 0.1g sodium lauryl sulfate, 11mL deionized water, 100mg graphene powder, and then ultrasonically disperse for 30min to form a stable graphene dispersion.

[0044] In a 100mL beaker, add 2g of n-octadecane, 1g of methyltrimethoxysilane, and 2g of ethyl orthosilicate to form an oil phase after being miscible. Then 0.328 g of cetyltrimethylammonium bromide was added to the oil phase. In another 100mL beaker, add 28.5mL of water and 14.2mL of ethanol in sequence, and make it miscible as the water phase. After the water phase was added to the oil phase and mixed, the mixture was emulsified for 2 minutes with a high-speed shearer at a speed of 13000 r / min to form an oil-in-water emulsion, and then ultrasonicated for 5 minutes to form a stable fine emulsion. The miniemulsion was transferred to a 100 mL round bottom flask and placed in an oil bath at 35 °C. The graphene dispersion was added dropwise into the miniemulsion, and then 5.5 mL of ethanol wa...

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Abstract

The invention discloses a graphene-silicon dioxide composite wall-material phase-change nanocapsule and a preparation method thereof. A core material of the phase-change nanocapsule is a paraffin phase-change material, a wall material of the phase-change nanocapsule is a graphene-silicon dioxide composite material, and the particle size of the nanocapsule is nanometer scale. The preparation methodcomprises the following steps: mixing the phase-change material with an alkoxy silane compound so as to obtain an oil phase, adding a cationic surfactant and a water / ethanol mixed solvent, and carrying out high-speed shearing and ultrasonic refining so as to obtain an oil-in-water type fine emulsion; dispersing graphene into deionized water under the assistance of an anionic surfactant so as to form stable graphene dispersion liquid; and dropwise adding the graphene dispersion liquid into the fine emulsion, sequentially adding ethanol and a basic catalyst, heating to react, filtering, washing, and drying, so as to obtain a black powder product. The wall material of the phase-change nanocapsule is the graphene-silicon dioxide composite material, so that a supercooling phenomenon of the phase-change nanocapsule can be eliminated, and meanwhile, the heat conductivity coefficient and heat stability of the phase-change nanocapsule can be increased.

Description

technical field [0001] The invention relates to the technical field of phase-change energy storage materials, in particular to a graphene-silicon dioxide composite wall material phase-change nanocapsule and a preparation method thereof. Background technique [0002] Phase change materials can store and release heat energy during the phase change of matter, and have the advantages of high energy storage density and constant temperature during heat storage / release. It is an important heat energy storage material and temperature control material. It is widely used in many fields such as energy-saving buildings, light-electricity-heat conversion, solar energy storage, industrial refrigeration, latent heat functional fluids, and smart clothing. [0003] Common phase change materials store and release thermal energy through solid-liquid phase transition, but they have problems such as melting leakage, low thermal conductivity, and flammability. Encapsulation of phase change mater...

Claims

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Application Information

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IPC IPC(8): C09K5/06B01J13/16
CPCB01J13/16C09K5/063
Inventor 梁书恩祝亚林田春蓉王建华陈可平罗炫张林
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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