The thermal conductivity improvements of phase change materials using modified carbon nanotubes

This paper describes a new method of modified carbon nanotubes (CNTs) by ethylene grafting or silicon coating. The thermal conductivity of paraffin is enhanced by the modified CNTs. The influence of modification on the dispersion stability of CNTs and the thermal conduction performance of paraffin a...

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Bibliographic Details
Published in:Diamond and related materials 2022-05, Vol.125, p.109023, Article 109023
Main Authors: Li, Min, Guo, Qiangang, Su, Yongli
Format: Article
Language:English
Subjects:
Carbon nanotubes
Dispersion
Fourier transforms
Grafting
Heat transfer
Infrared analysis
Paraffins
Phase change material
Phase change materials
Polyethylenes
Silicon
Stability
Thermal conductivity
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Summary:This paper describes a new method of modified carbon nanotubes (CNTs) by ethylene grafting or silicon coating. The thermal conductivity of paraffin is enhanced by the modified CNTs. The influence of modification on the dispersion stability of CNTs and the thermal conduction performance of paraffin are studied. Fourier transform infrared spectroscopy, scanning electron microscopy, thermal constant analyzer are used to analyze the composites. The results indicate that CNTs have been modified successfully. The dispersion stability of CNTs is significantly improved by polyethylene grafting or silicon coating. The thermal conductivity of paraffin phase change material is enhanced by 84.6% with the modified CNTs. The prepared paraffin/CNTs phase change materials show good thermal conductivity. [Display omitted] •Carbon nanotubes are modified separately by ethylene grafting and dioxide silica coating.•The dispersion stability of CNTs is significantly improved by polyethylene grafting or silicon dioxide coating.•The thermal conductivity of Paraffin/CNTs phase change material is enhanced by modifying CNTs.
ISSN:0925-9635
1879-0062
DOI:10.1016/j.diamond.2022.109023