Boundary lubrication: Influence of the size and structure of inorganic fullerene-like MoS2 nanoparticles on friction and wear reduction

Friction Modifier Additives

“…In one test the oil in the test holder was stirred for the first and third hour. The unstirred sample showed almost complete loss of friction reduction after about half an hour while in the other stirring enabled friction to remain low and even to recover friction reduction after this was lost during an unstirred period [237]. Figure 19.…”

“…Figure 19. Loss of IF-MoS 2 friction reduction during rubbing and its recovery by stirring [237] For a nanoparticle to be effective in controlling friction three requirements must be fulfilled; (i) the dispersed particles must enter the contact in sufficient quantities; (ii) once between the surfaces the particles must impart low friction; (ii) some adhesion of the particles to the surface is probably necessary.…”

MoS2/WS2 Quantum Dots as High‐Performance Lubricant Additive in Polyalkylene Glycol for Steel/Steel Contact at Elevated Temperature

“…[27,28] By contrast, MoS 2 /WS 2 nano with the larger particles size (≈90 nm) decrease friction and wear by carrying some of the load between contact surfaces ( Figure 12B-b), but most them tend to be pushed away with some being squeezed into the contact interface, demonstrating their diminishing tribological advantage as compared to MoS 2 /WS 2 QDs. [19,[27][28][29] The corresponding wear surfaces of lower steel disks lubricated by pure PAG, and PAG containing 0.1, 0.5, and 1.0 wt% MoS 2 /WS 2 QDs were further checked with 3D surface mapping profilometer. As shown in Figure 7A,a-a' and B,a- Figure 7A,d-d', or B,d-d').…”

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].…”

“…[12]. Examples of how nanoparticle size, structure or structural defect could affect their tribological properties have been explored by Rabaso et al [13]. These studies reported that nanoparticles with structural defects, i.e.…”