am9b21205_si_001.pdf (1.39 MB)
Enhanced Thermal Buffering of Phase Change Materials by the Intramicrocapsule Sub per Mille CNT Dopant
journal contribution
posted on 2020-03-26, 09:13 authored by 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 LevMicroencapsulation
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.