1. The additivation of a polyalphaolefin (PAO6) with copper oxides nanoparticles enhance the base oil viscosity even at low nanoparticles volume concentration. This enhanced viscosity, and not only the nanoparticle deposition on wear surfaces, can contribute to better tribological results. 2. All the used models appear reasonably predicting the relative viscosity for uniform-sized colloidal suspension with spherical geometry of the particles over a concentration range Φ= 0.5-2.0%.
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