%0 Journal Article
%A Li, Wen Hao
%A Lai-Iskandar, S.
%A Tan, Dunlin
%A Simonini, Luca
%A Dudon, Jean-Paul
%A Leong, Fei Ni
%A Tay, Roland
Yingjie
%A Tsang, Siu Hon
%A Joshi, Sunil C.
%A Teo, E. Hang Tong
%D 2020
%T Thermal Conductivity Enhancement and Shape Stabilization
of Phase-Change Materials Using Three-Dimensional Graphene and Graphene
Powder
%U https://acs.figshare.com/articles/journal_contribution/Thermal_Conductivity_Enhancement_and_Shape_Stabilization_of_Phase-Change_Materials_Using_Three-Dimensional_Graphene_and_Graphene_Powder/11625384
%R 10.1021/acs.energyfuels.9b03013.s001
%2 https://acs.figshare.com/ndownloader/files/21071226
%K GP
%K paraffin phase-change materials
%K PCM
%K conductivity
%K 3 DC H
%K Thermal Conductivity Enhancement
%K 3 DC
%X The
porous interconnected structure of three-dimensional graphene
(3DC) combines the excellent thermal conductivity of graphene with
an interconnected architecture, thereby creating a thermal network
within composites infused with 3DC. In this study, improvements in
thermal conductivity, latent heat of fusion (Hf), and shape stability of paraffin were compared between paraffin
phase-change materials (PCMs) infused with 3DC and with discrete graphene
flakes (GP) at the same filler loading to quantify the advantage of
the interconnected structure. Paraffin infused with a 3DC of higher
bulk density (3DCH) was also compared to identify the effects
of increasing filler density. Thermal conductivity of the PCM composites
was measured using the hot-disk method, and shape stabilization was
compared through thermal cycling in an environment chamber. We found
that the interconnected architecture of 3DC improved the properties
of the paraffin matrix in multiple ways. 3DC improved the solidification
process for paraffin with heterogeneous nucleation, helped retain
the shape of the PCM composite over thermal cycling, reduced void
formation within the PCM, and induced a large increase in thermal
conductivity, which was 7.4 times and 5.2 times that of neat paraffin
for composites infused with 3DCH and regular 3DC, respectively,
with only a small trade-off in Hf.
%I ACS Publications