An Investigation on the Reduced Ability of IF-MoS2 Nanoparticles to Reduce Friction and Wear in the Presence of Dispersants

Formation of an adsorption film of MoS2 nanoparticles and dioctyl sebacate on a steel surface for alleviating friction and wear

“…The formation of tribofilms by tribochemical reactions among the friction materials, base oil, and MoS 2 additive facilitates the lubricating behaviors of base oils with spherical nano-MoS 2 additives [4,10]. The tribofilms by tribochemical reactions were also observed in this work.…”

“…Nanoscaled MoS 2 (nano-MoS 2 or n-MoS 2 ) particles usually present better properties than bulk microsized 2H-MoS 2 (micro-MoS 2 or m-MoS 2 ) [4][5][6][7]. Thus, much attention was focused on the synthesis and tribological properties of MoS 2 nanoparticles [8][9][10][11][12][13]. The tribological properties of MoS 2 can also be improved by forming tube-like, sphere-like, or spherical inorganic fullerenelike (IF) structures.…”

“…The lubrication mechanism of base oils with spherical nanoMoS 2 is a three-step process [10]: The nano-MoS 2 particles enter the contact surface; the spherical nanoparticles exfoliate under the friction shear; the newly formed MoS 2 nano-platelets react with the surface and base oil to form a tribofilm. The formation of tribofilms by tribochemical reactions among the friction materials, base oil, and MoS 2 additive facilitates the lubricating behaviors of base oils with spherical nano-MoS 2 additives [4,10].…”

Interaction Between Selected MoS2 Nanoparticles and ZDDP Tribofilms

“…However, it appears that the above-mentioned mechanisms were derived based on experiments with model fluids [6][7][8][9][10][11][12][13][14][15][16] or on tests under dry contact conditions, mostly on steel surfaces. Some recent studies have explored the potentials of nanoparticles with non-ferrous surfaces such as diamond-like carbon (DLC) coatings [10,11].…”

“…Very little work exists on the interactions of nanoparticles with conventional additives. A very recent article of Rabaso et al [15] has investigated IF-MoS 2 nanoparticles functionality in fully formulated lubricants, claiming that there is no effect of nanoparticles on the behaviour of the oil, due to excess of dispersants used in commercial oil, which prevent the agglomeration of particles. Another work of Aldana et al [16] has explored great potential of WS 2 nanoparticles when mixed with conventional anti-wear additive such as zinc dialkyl dithiophosphate (ZDDP) and reported that nanoparticles were able to form nanosheets and strongly reduce friction.…”