Synergy between graphene and ionic liquid lubricant additives

Sanes, J.; Avilés, María-Dolores; Saurín, N.; Espinosa, Tulia; Carrión, F.J.; Bermúdez, Marı́a-Dolores

doi:10.1016/j.triboint.2017.07.030

Cited by 93 publications

(54 citation statements)

References 43 publications

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“…When (IL + G) was used (Figure 6a), the wear track was clearly visible, while no surface damage was observed in the profilometry image ( Figure 6b) of the steel surface after lubrication with (IL + G) thin film. This observation was in agreement with the formation of a protective surface layer, as has been proposed in previous works [11][12][13][14][19][20][21][22][23][24]30,31].…”

Section: Surface Analysis and Wear Mechanismsupporting

confidence: 93%

“…Among the wide spectrum of potential applications of graphene and graphene derivatives, such as graphene oxide (GO), there has been a recent interest in their use as surface modifiers and lubricant additives [7,8]. The chemical nature of ILs is an effective instrument for the surface modification and/or functionalization of nanoparticles and carbon nanophases [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. IL-graphene interactions may improve the dispersibility of the nanophases by inhibiting agglomeration.…”

Section: Introductionmentioning

confidence: 99%

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Graphene-Ionic Liquid Thin Film Nanolubricant

et al. 2020

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Graphene (0.5 wt.%) was dispersed in the hydrophobic room-temperature ionic liquid 1-octyl-3-methylimidazolium bis(trifluoromethanesulfonyl) imide (IL) to obtain a new non-Newtonian (IL + G) nanolubricant. Thin layers of IL and (IL + G) lubricants were deposited on stainless steel disks by spin coating. The tribological performance of the new thin layers was compared with those of full fluid lubricants. Friction coefficients for neat IL were independent of lubricant film thickness. In contrast, for (IL + G) the reduction of film thickness not only afforded 40% reduction of the friction coefficient, but also prevented wear and surface damage. Results of surface profilometry, scanning and transmission electron microscopy (SEM and TEM), energy dispersive analysis (EDX), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy were discussed.

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Section: Surface Analysis and Wear Mechanismsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Graphene-Ionic Liquid Thin Film Nanolubricant

et al. 2020

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“…It can be found that the wear rate of 3D graphene and 2D h‐BN mixture is the lowest compared to other single additives and pure PAO4 in Figure 4a. The wear rate is reduced by 69% compared to pure PAO4, which indicates that the wear rate is significantly reduced under the lubrication of 3D graphene and 2D h‐BN mixture, demonstrating the synergistic lubrication [ 32,33 ] between 3D graphene and 2D h‐BN. According to Figure 4b, it can be seen that the wear rate of 3 wt% 3D graphene mixed with 3 wt% 2D hexagonal boron nitride at the same volume (1:1) is the lowest.…”

Section: Resultsmentioning

confidence: 99%

Synergistic Lubricating Behaviors of 3D Graphene and 2D Hexagonal Boron Nitride Dispersed in PAO4 for Steel/Steel Contact

Geng

et al. 2020

Adv Materials Inter

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Nanomaterials as oil‐based lubricant additives improve the tribological properties of oils, and its enormous potential in oil‐based applications has attracted increasing attention. However, 2D materials have limited applications in industry due to its high price. 3D graphene (3D Gr) has become a substitute of 2D graphene because of its low price. Hexagonal boron nitride (h‐BN) is known as white graphene and is a material with potential lubrication applications. In this paper, the combination of the two different dimensions materials not only plays a significant role in reducing environmental pollution, but also exerts excellent properties of both materials. The results show that the mixed‐dimensional nanomaterials have good macroscopic lubricity under oil.

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“…Recently, the synergetic friction modification effects between ionic liquid and nanoparticle additives have been investigated [38,66,80]. It is possible that the addition of ionic liquid improves the dispersion stability of nanolubricants.…”

Section: Formulation With Dispersantmentioning

confidence: 99%

Dispersion of Nanoparticles in Lubricating Oil: A Critical Review

2019

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Nanolubricants have attracted great interest due to the promise of friction and wear reduction by introducing nanoparticles. To date, the foremost challenge for developing a new nanolubricant is particle suspension. To understand the mechanisms of nanoparticle dispersion and identify bottlenecks, we conducted a comprehensive review of published literature and carried out an analysis of dispersion based on available data from the past 20 years. This research has led to three findings. First, there are two primary methods in dispersion: formulation with dispersant and surface modification. Second, surfactant and alkoxysilanes are primary chemical groups used for surface modification. Third, functionalization using surfactant is found to be suitable for nanoparticles smaller than 50 nm. For larger particles (>50 nm), alkoxysilanes are the best. The existence of a critical size has not been previously known. To better understand these three findings, we conducted an analysis using a numerical calculation based on colloidal theory. It revealed that a minimal thickness of the grafted layer in surfactant-modified nanoparticles was responsible for suspending small nanoparticles. For larger nanoparticles (>50 nm), they were suitable for silanization of alkoxysilane due to increased grafting density. This research provides new understanding and guidelines to disperse nanoparticle in a lubricating oil.

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Synergy between graphene and ionic liquid lubricant additives

Cited by 93 publications

References 43 publications

Graphene-Ionic Liquid Thin Film Nanolubricant

Graphene-Ionic Liquid Thin Film Nanolubricant

Synergistic Lubricating Behaviors of 3D Graphene and 2D Hexagonal Boron Nitride Dispersed in PAO4 for Steel/Steel Contact

Dispersion of Nanoparticles in Lubricating Oil: A Critical Review

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