Investigation on tribological behaviors of MoS2 and WS2 quantum dots as lubricant additives in ionic liquids under severe conditions

Gong, Kuiliang; Lou, Wenjing; Zhao, Gaiqing; Wu, Xinhu

doi:10.1007/s40544-019-0290-6

Cited by 25 publications

(17 citation statements)

References 26 publications

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“…Furthermore, several studies revealed ecofriendly ILs additives had demonstrated excellent nanodispersions, especially in lube oils. [67][68][69][70] ILs are used as a medium to synthesis nanoparticles in the base oil. Nanoparticles are mainly utilized in ILs to observe the reaction in intermolecular structure, which changes the van der Waals, electrostatic, and hydrogen bonding in the base oil.…”

Section: Effect Of Ils On the Dispersion Stabilitymentioning

confidence: 99%

A review of recent advances of ionic liquids as lubricants for tribological and thermal applications

Ali

Abdelkareem

Chowdary

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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The novel characteristics of ionic liquids (ILs) led to an improved tribological and thermal performance. This article discusses current progress in developing ILs as neat lubricants or additives in lube oils, with a focus on ILs chemistry, synthesis, miscibility, and other relevant rheological, thermal, and tribological properties at macro to nanoscales. This article also introduces a review of lubrication mechanisms based on the tribofilm formed on the rubbing interfaces owing to tribochemical reactions among the ILs, base oil, and solid bodies, which shows key insights into anti-wear properties. ILs exhibited superior anti-wear properties compared to fully formulated oils. Notably, there was no symmetry between the friction results of ILs and their wear counterpart. Furthermore, the main challenges to further improve ILs performance for tribological applications are highlighted. Eventually, prospects for ILs tribology are suggested, which will guide the development and synthesis of ILs-based lubricants for tribological applications.

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Section: Effect Of Ils On the Dispersion Stabilitymentioning

confidence: 99%

A review of recent advances of ionic liquids as lubricants for tribological and thermal applications

Ali

Abdelkareem

Chowdary

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…These impressive physical properties have motivated scholars to examine the applicability of WS 2 and MoS 2 QD additives [96]. Gong et al [97] prepared MoS 2 and WS 2 QDs and dispersed them in 1-butyl-3-methylimidazolium hexafluorophosphate to obtain homogeneous dispersions with long-term stability. According to the tribological results, adding WS 2 and MoS 2 QDs to this IL significantly enhanced the friction-reduction and antiwear performance of the base fluid.…”

Section: Metal Sulfidesmentioning

confidence: 99%

Inorganic nanomaterial lubricant additives for base fluids, to improve tribological performance: Recent developments

et al. 2021

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In this paper, we review recent research developments regarding the tribological performances of a series of inorganic nano-additives in lubricating fluids. First, we examine several basic types of inorganic nanomaterials, including metallic nanoparticles, metal oxides, carbon nanomaterials, and “other” nanomaterials. More specifically, the metallic nanoparticles we examine include silver, copper, nickel, molybdenum, and tungsten nanoparticles; the metal oxides include CuO, ZnO, Fe3O4, TiO2, ZrO2, Al2O3, and several double-metal oxides; the carbon nanomaterials include fullerene, carbon quantum dots, carbon nanotubes, graphene, graphene oxides, graphite, and diamond; and the “other” nanomaterials include metal sulfides, rare-earth compounds, layered double hydroxides, clay minerals, hexagonal boron nitride, black phosphorus, and nanocomposites. Second, we summarize the lubrication mechanisms of these nano-additives and identify the factors affecting their tribological performance. Finally, we briefly discuss the challenges faced by inorganic nanoparticles in lubrication applications and discuss future research directions. This review offers new perspectives to improve our understanding of inorganic nano-additives in tribology, as well as several new approaches to expand their practical applications.

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“…Several classes of two-dimensional (2D) nanomaterials, such as molybdenum disulfide (MoS 2 ), graphene nanoplatelets (GNPs), and hexagonal boron nitride (BN), have been studied as lubricant additives due to their unique lamellar structure. − The weak van der Waals interlayer bonding allows the basal planes to easily slip away, thus greatly reducing the friction coefficient. However, they still possess some drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Influence of Structural Disorders on the Tribological Behavior of Phosphate-Intercalated Layered Double Hydroxide Additives in Polyalphaolefin

2022

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In this work, several phosphate-intercalated Mg–Al layered double hydroxides (LDHs) were synthesized and evaluated as solid lubricant additives in polyalphaolefin (PAO-4) by means of tribotesting on coupled GCr15/cast iron contacts. The effects of test parameters such as normal loads, additive concentrations, and substrate surface roughness were investigated, while the LDH crystal structure received considerable attention. Several types of structural disorder after anion exchange were identified based on X-ray diffraction (XRD) analysis. The unstable structures promote feasible shearing during sliding to improve friction and wear. In addition, antiwear properties correlate well with the anion charge number or the quantity of anion in the interlayer region. Overall, the tribological performance increased in the order HPO4 2–-LDH < PO4 3–-LDH < P2O7 4–-LDH < (PO3)6 6–-LDH. (PO3)6 6–-LDH demonstrated the best antiwear performance with a reduction of 69% of the ball volume loss compared to PAO-4 oil due to the synergy of the disordered stacking LDH sheets and flexible ring structure of the (PO3)6 6– anion. Furthermore, on polished surfaces, the coefficient of friction (COF) of the (PO3)6 6–-LDH sample dropped significantly by 26%, while the wear loss reduction of more than 80% was also substantial compared to the base oil sample. A performance comparison between the best-performing LDH additive was also conducted against popular nanomaterials, such as hexagonal boron nitride (BN), graphene nanoplatelets (GNPs), and titanium oxide (TiO2). The performance of (PO3)6 6–-LDH was close to that of GNPs.

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Investigation on tribological behaviors of MoS2 and WS2 quantum dots as lubricant additives in ionic liquids under severe conditions

Cited by 25 publications

References 26 publications

A review of recent advances of ionic liquids as lubricants for tribological and thermal applications

A review of recent advances of ionic liquids as lubricants for tribological and thermal applications

Inorganic nanomaterial lubricant additives for base fluids, to improve tribological performance: Recent developments

Influence of Structural Disorders on the Tribological Behavior of Phosphate-Intercalated Layered Double Hydroxide Additives in Polyalphaolefin

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