Enhanced Thermal Buffering of Phase Change Materials by the Intramicrocapsule Sub per Mille CNT Dopant

Alexey A. Mikhaylov, Sergey Sladkevich, Alexander G. Medvedev, Petr V. Prikhodchenko, Jenny Gun, Konstantin A. Sakharov, Zhichuan J. Xu, Vladimir Kulish, Vitaly A. Nikolaev, Ovadia Lev*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Microencapsulation of a carbon nanotube (CNT)-loaded paraffin phase change material, PCM in a poly(melamine-formaldehyde) shell, and the respective CNT-PCM gypsum composites is explored. Although a very low level (0.001-0.1 wt %) of intramicrocapsule loading of CNT dopant does not change the thermal conductivity of the solid, it increases the measured effusivity and thermal buffering performance during phase transition. The observed effusivity of 0.05 wt % CNT-doped PCM reaches 4000 W s-0.5 m-2 K-1, which is higher than the reported effusivity of alumina and alumina bricks and an order of magnitude larger than the solid, CNT-free PCM powder. The CNT dopant (0.015 wt %) in a 30 wt % PCM-plaster composite improved the effusivity by 60% compared to the CNT-free composite, whereas the addition of the same amount of CNTs to the bulk of the plaster does not improve either the effusivity or the thermal buffering performance of the composite. The thermal enhancement is ascribed to a CNT network formation within the paraffin core.

Original languageAmerican English
Pages (from-to)16227-16235
Number of pages9
JournalACS applied materials & interfaces
Volume12
Issue number14
DOIs
StatePublished - 8 Apr 2020

Bibliographical note

Publisher Copyright:
Copyright © 2020 American Chemical Society.

Keywords

  • CNT
  • energy storage
  • microencapsulation
  • phase change materials (PCM)
  • thermal buffering
  • transient plane source method

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