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Nanomaterials 2020, 10, 200 10 of 12 The peak in bonding energy at 168.9 eV was attributed to S2p in Figure 8b, i.e., the bonding of sulfur to oxygen (S–O) [27]. Accordingly, it shows the presence of oxides of Mo in the tribo-film, whereas the peak at 226.3 eV was attributed to S (S2s) rather than Mo [13]. The peak of S2p appeared at the binding energy of 169.3 eV, corresponding to the S4+ state realized in FeSO4 [28]. The peak component of S2p at the low bonding energy of 162.1 eV was attributed to the presence of Fe-S [13]. Thus, the above results reveal that fewer nano-MoS2 QDs were oxidized to MoO3, and the tribo-film with MoS2 QDs had more MoS2 but less MoO3 [29]. These peaks demonstrate that the patched composite film consisted of MoS2, FeS, and sulfate, which was the source of improved tribological performance and enhanced lubricant durability. The combination of MoS2 QDs and paroline oil facilitated the formation of the tribo-film. According to the above results, a ball-on disc schematic diagram of the sliding process is shown in Figure 9. Paroline oil can adsorb onto the rubbing interface and form a tribo-film, which plays a protective role during the friction process. With the addition of MoS2 QDs, the nano-additives and paroline oil self-assemble and form a nanocomposite layer on the sliding regions during the rubbing process, such as MoS2, MoO3, FeS, FeSO4, etc., thus minimizing friction and wear. The improvement in tribological performance indicates that the composite oil can easily form a tribo-film and adsorb onto the wear track during the sliding process. Therefore, MoS2 QDs have anti-wear and anti-friction properties as a lubricating oil additive. In addition, the amount of MoS2 QDs plays a decisive role in tribological performance. With the increase in additive, the viscosity of the composite lubricant oil exhibited an increasing trend, but the change was not the main factor behind the boundary lubrication regime for the ball-on-disc contact. MoS2 QDs can be sustainably dispersed in paraffin oil. In the 10-day dispersion experiment, the oil samples containing MoS2 QDs had good dispersion, and no Nanomaterials 2020, 10, 200 11 of 13 particle sedimentation occurred. FiguFriegu9r.eSc9h.eSmchaetimc adtiiacgrdaiamgroafmtheoflutbhreiclautbinrgicamtiencghamneiscmha:n(ias)mb:al(la-)onb-adlils-ocnf-rdicitsiconfrmictoiodnel;m(bo)dveli;sc(obs)ity withvirsecsopseitcytwtoitahdrdeistpiveectatmoaodudnit;iv(ce)aamdosuonrpt;ti(oc)napdrsocrepstisoonfpraorcoelsisnoefopialrwoliitnheMoiolSwitQhDMso.S2 QDs. 4.BCeocanuclsuestiohnesspherical MoS2 QDs function as ball-bearing lubricants in the process of friction, they can be adsorbed onto the slide track by adding MoS2 QDs to pure paroline oil to prevent the 1. Monodisperse MoS2 QDs ranging from 1.5 to 5 nm were prepared, with a paralleled and frictional component from contacting it directly [30,31]. In summary, the synergistic lubrication effect ordered lattice fringe, and a lattice fringe spacing of about 0.2 nm. In addition, MoS2 QDs were of the tribo-film, the improvement of the bearing capacity, and the ball-bearing effect together lead to sustainably dispersed in paraffin oil, showing no particle sedimentation in the 10-day dispersion by the 0.3 wt.% MoS2 QD oil sample, which dropped by approximatively 64% compared to the pure paraffin base oil. Furthermore, the rubbing time obviously decreased with the increase in MoS2 QDs. 3. The main wear type of the worn surfaces lubricated by the paroline base oil with MoS2 QDs could be attributed to slight ploughing wear. Pure paroline oil presented an obvious furrow and indentation, with a corresponding maximum depth of 2.8 μm. 4. The MoS2 QDs play a decisive role in the improvement of the tribological performance. The the lowest friction and wear. experiment. 2. With the addition of MoS2 QDs to the paraffin oil, the lowest COF of 0.061 could be obtained 2 potential lubrication mechanisms include the formation of a composite tribo-film composed of MoS ,PDF Image | Nano-MoS2 Quantum Dots as Liquid Lubricant Additive for Tribo
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