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Nanomaterials 2020, 10, 200 11 of 12 4. Conclusions 1. Monodisperse MoS2 QDs ranging from 1.5 to 5 nm were prepared, with a paralleled and ordered lattice fringe, and a lattice fringe spacing of about 0.2 nm. In addition, MoS2 QDs were sustainably dispersed in paraffin oil, showing no particle sedimentation in the 10-day dispersion experiment. 2. With the addition of MoS2 QDs to the paraffin oil, the lowest COF of 0.061 could be obtained 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 potential lubrication mechanisms include the formation of a composite tribo-film composed of MoS2, MoO3, FeS, and FeSO4. Additionally, spherical MoS2 QDs have aprobable ball-bearing lubrication effect during the friction process. Author Contributions: J.G. conceptualized and designed this work; R.P., H.D., and Y.S. performed the characterization of MoS2 QDs; Y.L. and J.L. prepared the original draft; G.D. and J.G. edited the draft. All authors have read and agreed to the published version of the manuscript. Funding: This work was supported by the Science and Technology on Diesel Engine Turbocharging Laboratory (6142212190104), the Special Research Project in Shaanxi Province Department of Education (18JK0392), the Special Scientific Research Plan in Shaanxi Province of China (2018JM5046), and the Key Laboratory Research Program of Education Department of Shaanxi Province (No. 18JS044). Conflicts of Interest: The authors declare no conflicts of interest. References 1. Ofune, M.D.; Banks, P.; Morina, A.; Neville, A. Development of valve train rig for assessment of cam/follower tribochemistry. Tribol. Int. 2016, 93, 733–744. [CrossRef] 2. Guo, J.; Li, Y.; Lu, H.; Qin, L.; Li, Y.; Dong, G. An effective method of edge deburring for laser surface texturing of Co-Cr-Mo alloy. Int. J. Adv. Manuf. Technol. 2018, 94, 1491–1503. [CrossRef] 3. Cao, W.; Zhang, H.; Wang, N.; Wang, H.W.; Peng, Z.X. The gearbox wears state monitoring and evaluation based on on-line wear debris features. Wear 2019, 426, 1719–1728. [CrossRef] 4. Qin, L.; Feng, X.; Hafezi, M.; Zhang, Y.; Guo, J.; Dong, G.; Qin, Y. Investigating the tribological and biological performance of covalently grafted chitosan coatings on Co-Cr-Mo alloy. Tribol. Int. 2018, 127, 302–312. [CrossRef] 5. Guo, J.; Mei, T.; Li, Y.; Ren, S.; Hafezi, M.; Lu, H.; Li, Y.; Dong, G. Sustained-release application of PCEC hydrogel on laser-textured surface lubrication. Mater. Res. Express 2018, 5, 065315. [CrossRef] 6. Kalin, M.; Kogovšek, J.; Remškar, M. Nanoparticles as novel lubricating additives in a green, physically based lubrication technology for DLC coatings. Wear 2013, 303, 480–485. [CrossRef] 7. Wu, H.; Wang, L.; Johnson, B.; Yang, S.; Zhang, J.; Dong, G. Investigation on the lubrication advantages of MoS2 nanosheets compared with ZDDP using block-on-ring tests. Wear 2018, 394–395, 40–49. [CrossRef] 8. Matczak, L.; Johanning, C.; Gil, E.; Guo, H.; Smith, T.W.; Schertzer, M.; Iglesias, P. Effect of cation nature on the lubricating and physicochemical properties of three ionic liquids. Tribol. Int. 2018, 124, 23–33. [CrossRef] 9. Vengudusamy, B.; Green, J.H.; Lamb, G.D.; Spikes, H.A. Behaviour of MoDTC in DLC/DLC and DLC/steel contacts. Tribol. Int. 2012, 54, 68–76. [CrossRef] 10. Sgroi, M.; Gili, F.; Mangherini, D.; Lahouij, I.; Dassenoy, F.; Garcia, I.; Odriozola, I.; Kraft, G. Friction reduction benefits in valve-train system using IF-MoS2 added engine oil. Tribol. Trans. 2015, 58, 207–214. [CrossRef] 11. Zhao, J.; He, Y.; Wang, Y.; Wang, W.; Yan, L.; Luo, J. An investigation on the tribological properties of multilayer graphene and MoS2 nanosheets as additives used in hydraulic applications. Tribol. Int. 2016, 97, 14–20. [CrossRef] 12. Zhang, X.; Luster, B.; Church, A.; Muratore, C.; Voevodin, A.A.; Kohli, P.; Aouadi, S.; Talapatra, S. Carbon nanotube—MoS2 composites as solid lubricants. ACS Appl. Mater. Inter. 2009, 1, 735–739. [CrossRef]PDF Image | Nano-MoS2 Quantum Dots as Liquid Lubricant Additive for Tribo
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