Experimental investigations of rheological behaviour and thermal conductivity of nanogrease

The fabrication of composite nanogrease based on carbon nanotubes (CNT) as an additive at different volume concentrations 0, 0.5, 1, 2, and 3 wt%. The correlation between CNT and grease rheological behavior was studied. Also, the effects of shear thinning rate at various temperatures and the thermal conductivity of nanogrease was evaluated. Results showed that grease behaves like a Newtonian viscoelastic material with a narrow linear domain. Aside from an enhanced thermal and mechanical stability, thermal conductivity was also improved by nearly 31.58%. Additionally, the apparent viscosity and dropping point increased by nearly 93% and 27%, respectively.