AAD%	Absolute average deviation
α p	Isobaric thermal expansivity (K−1)
CB	Carbon black
D, η0, T0	Vogel-Fulcher-Tammann-Hesse fitting coefficients
DSC	Differential scanning calorimetry
EG	Ethylene glycol
G/D-p	Purified graphite/diamond nanomixture
G/D-r	Raw graphite/diamond nanomixture
k	Thermal conductivity (W·m−1·K−1)
K	Flow consistency factor (mPa·sn)
MWCNT	Multiwalled carbon nanotubes
n	Flow behavior index
nD87	Nano-diamonds, purified, grade G
nD97	Nano-diamonds, purified, grade G01
NePCM	Nano-enhanced phase change material
PCM	Phase change material
PEG	Poly(ethylene glycol)
T	Temperature (K)
TES	Thermal energy storage
β	Heating/cooling rate (K·min−1)
ΔH	Latent heat (J·g−1)
η	Dynamic viscosity (mPa·s)
ρ	Density (g·cm−3)
σ	Surface tension, SFT, (mN·m)
φ	Mass fraction
ϕ	Volume fraction
nD97	Nano-diamonds, purified, grade G01
G/D-p	Purified graphite/diamond nanomixture
G/D-r	Raw graphite/diamond nanomixture.
X c	Crystallinity degree
p	Pressure (MPa)
s	Standard deviation
wt.%	Mass concentration
Subscripts
bf	Base fluid
cryst.	Crystallization
melt.	Melting
nf	Nanofluid
np	Nanoparticle
Superscript
0	100% crystallinity