Interactions between MoS2 nanotubes and conventional additives in model oils

The use of transition metal dichalcogenides nanoparticles is an emerging concept in lubrication for enhancing the tribological properties of lubricants. However, in fully-formulated products other properties are essential for providing a comprehensive protection against degradation. Therefore, the coexistence of nanoparticles with conventional additives is unavoidable. The main objective of this work is to investigate the tribological performance of MoS2 nanotubes accompanied by anti-wear, extreme pressure, detergents and dispersants. The results shown synergetic interactions between MoS2 nanotubes with anti-wear and detergents additives, slight synergy with extreme-pressure additives and antagonistic interactions with dispersants. Under extreme pressure conditions all selected additives provide synergistic effects with MoS2 nanotubes. The interaction mechanisms are investigated using several techniques and discussed in terms of tribofilm chemistry.