Ionanocarbon Lubricants. The Combination of Ionic Liquids and Carbon Nanophases in Tribology

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

doi:10.3390/lubricants5020014

Cited by 31 publications

(10 citation statements)

References 59 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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“…Indeed, the length and size of the cation molecules in ILs is the main controlling factor for the rheology of ILs. , This shows that unlike conventional molecular solvents, the ILs can be tweaked to optimize their properties and hence the overall economics of the process . These properties make them suitable for a wide range of applications such as inorganic and organic synthesis and catalysis, − extraction and separation, − nanomaterial synthesis, , microreactors, lubricants, membrane preparation, energy and sensors, metal–organic frameworks, food and bioproducts, pharmaceuticals, and polysaccharide processing . In particular, the effective selective extraction of different components from polysaccharides is now possible by dissolving them in ILs, as shown by the studies from the last 10–15 years .…”

Section: Introductionmentioning

confidence: 99%

Rheology of Pure Ionic Liquids and Their Complex Fluids: A Review

Shakeel

Mahmood

Farooq

et al. 2019

ACS Sustainable Chem. Eng.

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Ionic liquids (ILs) are liquid salts at ambient or lower temperatures and consist of ions and short-lived ion pairs. They are potential alternatives to toxic, hazardous, highly flammable, and volatile solvents for preparing solutions, dispersions, gels, composites, and polymeric melts. ILs have some very interesting and unique characteristics like good chemical and thermal stability and very low vapor pressures. They have good solvation interactions with a wide range of organic, inorganic, and polymeric compounds. They can enhance colloidal stability and the elasticity range of polymers. ILs are environmental friendly, easily recyclable, and structurally similar to the conventional solvents. For optimal performance, it is necessary to fully understand the rheological properties of ILs and their different systems for academic interests such as understanding the ability of ILs as processing aids particularly in film casting, fiber spinning and spraying, comprehension of thermodynamics and dynamics of polymer chains in ILs, analyzing the hydrodynamic volume of dispersed polymer, polymer–ILs interactions, characterizing the viscoelastic properties and nanophase–ILs interactions in nanocomposite systems, analyzing the plasticization efficiency, and the final properties of the composite system. The rheological analysis is also important for industrial purposes particularly for designing processing techniques and suitable operating conditions for IL based systems. The aim of this review is to give an overview of the rheological properties of pure ionic liquids and solutions, dispersions, gels, composites, and melts based on ionic liquids.

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“…In the recent decade, ionic liquids (ILs) have shown great potential as lubricants [6][7][8][9][10][11][12][13][14] or lubricant additives [15][16][17][18][19][20][21][22][23][24][25][26] due to their excellent physicochemical properties [27,28], including low melting point, low flammability, negligible vaper pressure, and high thermal stability. One of the most important characteristics of ILs is that their properties can be tailored by varying the species of the cations and anions, giving rise to numerous families that can be used across different tribological systems.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ionicity of Three Protic Ionic Liquids as Neat Lubricants and Lubricant Additives to a Biolubricant

2019

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Friction and wear of sliding surfaces are responsible for important energy losses and negative environmental effects. The use of environmentally friendly and cost-effective protic ionic liquids as neat lubricants and lubricant additives has the potential to increase the efficiency and durability of mechanical components without increasing the environmental damage. In this work, three halogen-free protic ionic liquids with increasing extent of ionicity, 2-hydroxyethylammonium 2-ethylhexanoate, 2-hydroxymethylammonium 2-ethylhexancate, and 2-hydroxydimethylammonium 2-ethylhexanoate, were synthesized and studied as neat lubricants and additives to a biodegradable oil in a steel–steel contact. The results show that the use of any protic ionic liquid as a neat lubricant or lubricant additive reduced friction and wear with respect to the biodegradable oil. The ionic liquid with the lowest ionicity reached the highest wear reduction. The one possessing the highest ionicity presented the poorest friction and wear behaviors as a neat lubricant, probably due to the more ionic nature of this liquid, which promoted tribocorrosion reactions on the steel surface. This ionic liquid performed better as an additive, showing that a small addition of this liquid in a biodegradable oil is enough to form protective layers on steel surfaces. However, it is not enough to accelerate the wear process with detrimental tribocorrosion reactions.

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Ionanocarbon Lubricants. The Combination of Ionic Liquids and Carbon Nanophases in Tribology

Cited by 31 publications

References 59 publications

Graphene-Ionic Liquid Thin Film Nanolubricant

Graphene-Ionic Liquid Thin Film Nanolubricant

Rheology of Pure Ionic Liquids and Their Complex Fluids: A Review

Effect of Ionicity of Three Protic Ionic Liquids as Neat Lubricants and Lubricant Additives to a Biolubricant

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