From: Rheological behavior of 10W40 base oil containing different combinations of MWCNT-Al2O3 nanoparticles and determination of the target nano-lubricant for industrial applications
NPs
Purity
APS
SSA
Color
True density
Morphology
MWCNT
> 95 wt%
5–15 nm
233 m2/g
Black
~ 2.1 g/cm3
Cylindrical
Al2O3
≥ 99%
20 nm
138 m2/g
white
3.97 g/cm3
Nearly spherical