“…Due to these limitations, new strategies have been investigated. They consist in the introduction, in the lubricant base, of nanoparticles of tribo-active phases (MoS 2 , graphite) [11][12][13] or precursors of tribo-active phases (fullerenes, carbon-onions, carbon nanotubes, inorganic fullerenes and nanotubes, …) [14][15][16][17][18][19][20][21][22] subjected to build on the sliding surfaces, in the physical conditions of the sliding interface, the tribofilm without any chemical reactions with the substrates. Additionally, the immediate formation of the tribofilm can be obtained in the case of optimized formulation as far as the tribo-active nanoparticles are expected to instantaneously form the tribologic film in the sliding contact.…”