Hybrid combinations of graphene nanoplatelets and phosphonium ionic liquids as lubricant additives for a polyalphaolefin

Nasser, Khodor I.; Río, José M. Liñeira del; López, Enriqueta R.; Fernández, Josefa

doi:10.1016/j.molliq.2021.116266

Cited by 26 publications

(11 citation statements)

References 65 publications

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“…The increased lubricating behaviour can be influenced by specific surface area of the graphene nano particles 25 . By accelerating the development of a protective tribo‐film on the contact surfaces by chemical or adsorption processes, the greater specific surface area reduces friction and wear by avoiding direct metal–metal contacts 12,26 …”

Section: Resultsmentioning

confidence: 99%

“…25 By accelerating the development of a protective tribo-film on the contact surfaces by chemical or adsorption processes, the greater specific surface area reduces friction and wear by avoiding direct metal-metal contacts. 12,26 The lubricant film strength (LFS) and frictional power lose (FPL) are very significant parameters that can describe the anti-friction and anti-wear behaviour of lubricating grease. 24,27,28 Figure 4a depict the variation in LFS and FPL parameters with the concentration of graphene in base grease.…”

Section: Friction and Wear Performance Test Of Nanocomposite Greasementioning

confidence: 99%

“…1,9 The tribological advantage of graphene has been demonstrated in prior investigations particularly for rolling/sliding interactions. 10,11 In this context Nasser et al 12 reported investigations on the lubricant additive performance of composite mixtures of graphene nanomaterials and phosphonium ionic liquids in polyalphaolefin base oils. Consequently, Bermann et al 13 presented an experimental investigation to demonstrate the frictional characteristics of graphene in sliding contacts and highlighted that the composite mixture of graphene in ethanol effectively reduce friction.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation to assess the effect of graphene blended lithium grease on friction, wear, and surface morphology of 52100 chrome alloy steel contacts

Prasad,

Kamarapu,

Bhoi

et al. 2023

Lubrication Science

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The results of a research on the tribological behaviour of lithium grease with the addition of graphene nanoparticles are presented in current work. Using a four‐ball tribometer, the wear and friction coefficient of lithium grease and blended grease samples with graphene additions were assessed. The significance of graphene in enhancing the tribological properties of grease materials is evident from experimental results. In the experimental investigation, a considerable decrease in wear and friction co‐efficient values was also noted. One weight percent addition of graphene to base grease decreases friction by 23.73% and wear scar width by 19.51%.

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Section: Resultsmentioning

confidence: 99%

Section: Friction and Wear Performance Test Of Nanocomposite Greasementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental investigation to assess the effect of graphene blended lithium grease on friction, wear, and surface morphology of 52100 chrome alloy steel contacts

Prasad,

Kamarapu,

Bhoi

et al. 2023

Lubrication Science

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“…There was an immense number of papers published on this topic [3,4,[10][11][12][13][14]. However, with the appearance of new cation/anion combinations and different application conditions, new and unique features of ILs could be revealed [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

A Comparison of the Tribological Properties of Two Phosphonium Ionic Liquids

Horng,

Ta,

Kreivaitis

et al. 2024

Lubricants

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For over two decades, ionic liquids have been among the most exciting lubrication topics. Ionic liquids were investigated by using them as neat lubricants and lubricity-enhancing additives. However, new and unique features were revealed by introducing new ionic liquids. This paper compares the tribological properties of two ionic liquids with the same trihexyltetradecylphosphonium [P 6,6,6,14] cation and different anions—dicyanamide [DCN] and bis(2,4,4-trimethylpentyl)phosphinate. The widely investigated 1-Butyl-3-methylimidazolium hexafluorophosphate [BMIM] [PF6] ionic liquid was used as a reference. The lubricity was comprehensively investigated using two testing modes: reciprocation in a ball-on-plate tribometer and continuous sliding in a ball-on-disc tribometer. The tests were performed at temperatures of 30 and 80 °C. The friction, wear, and film thickness were evaluated, and a worn surface analysis was conducted. It was found that in the case of reciprocation, anion has a significant effect on the lubricity. The difference was particularly evident when the results at two temperatures were compared. The ability to build a low-friction tribo-film was suggested as the primer source of lubricity. In the case of continuous sliding, the differences were not as noticeable. In this case, viscosity was assigned to be the leading property.

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“…ILs have significant ion conductivity, high thermal stability, and extremely low volatility. Therefore, they are widely investigated as prospective solvents, lubricant additives, and separation media. − Supporting ILs on solids or within nanoporous substrates is an attractive alternative to bulk ILs because it reduces the usage of the ILs, thus decreasing the processing costs and promoting greener manufacturing. , ILs are also potential electrolytes for energy storage and conversion devices, solvating a broad class lithium and alkaline salts . More specifically, confining ILs in nanoporous materials is anticipated for their use in electrodes, solid electrolytes, and redox flow batteries. ,, The prediction of transport properties in these highly viscous fluids is hindered by the complex intra- and intermolecular interactions in ILs …”

Section: Introductionmentioning

confidence: 99%

Nanoconfinement Effects on the Transport of Redox Probes in Ionic Liquid-Loaded Mesoporous Silica Thin Films

Khan

Drake

et al. 2022

Ind. Eng. Chem. Res.

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The transport of two redox probes, 1,1′-ferrocenedimethanol (FDM, hydrophilic) and 1,1′-dioctadecyl-4,4′-bipyridinium dibromide (DBD, hydrophobic), through ionic liquidfilled and/or functionalized silica nanoporous thin films is compared as a function of pore size (2.5 and 8 nm diameter pores). Electrochemical impedance spectroscopy (EIS) was used to measure the permeability of these aqueous probes through the bare silica films and silica films with pores containing a physically confined ionic liquid (IL, 1-butyl-3-methylimidazolium hexafluorophosphate (Functionalization of the nanoporous thin films with an IL-like group provides a barrier to the hydrophilic redox probe (a 40-fold decrease in permeability relative to bare 2.5 nm porous silica films), with only a 50% corresponding decrease in the permeability of the hydrophobic probe. The selectivity to hydrophobic solutes suggested by the barrier properties of IL-functionalized silica is less pronounced in the films with the larger 8 nm pores. Physically confining an IL in the pores of both bare and IL-functionalized pores results in similar transport as the corresponding non-IL filled pores. The ability to tune solute transport through nanoconfined ILs using pore size and surface functionalization is critical to the design of composite thin films for IL-based separation and energy storage applications.

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Hybrid combinations of graphene nanoplatelets and phosphonium ionic liquids as lubricant additives for a polyalphaolefin

Cited by 26 publications

References 65 publications

Experimental investigation to assess the effect of graphene blended lithium grease on friction, wear, and surface morphology of 52100 chrome alloy steel contacts

Experimental investigation to assess the effect of graphene blended lithium grease on friction, wear, and surface morphology of 52100 chrome alloy steel contacts

A Comparison of the Tribological Properties of Two Phosphonium Ionic Liquids

Nanoconfinement Effects on the Transport of Redox Probes in Ionic Liquid-Loaded Mesoporous Silica Thin Films

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