Modified graphene as novel lubricating additive with high dispersion stability in oil

Wu, Pu; Chen, Xinchun; Zhang, Chenhui; Zhang, Jiping; Luo, Jianbin; Zhang, Jiyang

doi:10.1007/s40544-019-0359-2

Cited by 60 publications

(30 citation statements)

References 33 publications

(36 reference statements)

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“…An environment-friendly NFCF was prepared using soybean oil as the base oil and NGPs as additives. Graphite is often used as a lubricant in the form of graphite microparticles evenly distributed in water, oil, or other liquids [28]. The microparticles existed as extremely fine particles (30 nm diameter) in this study.…”

Section: Preparation Of Nfcfmentioning

confidence: 78%

Penetration and lubrication evaluation of vegetable oil with nanographite particles for broaching process

2020

Friction

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With increasing environmental concerns, the substitution of mineral oil-based cutting fluid has become an urgent issue. Using vegetable soybean oil as base fluid, nanofluid cutting fluids (NFCFs) were prepared by adding different weight concentrations of nanographite particles (NGPs), and their penetration and lubrication performances were studied. A novel simulated tool-chip slit with micrometer-sized geometry was manufactured to evaluate and quantify the penetration rate of the NFCFs by image analysis approach. Moreover, a large number of comparative experiments on the closed-type broaching machine were carried out to compare the performance of the proposed NFCFs and a commercial cutting fluid in terms of cutting force, workpiece surface roughness, and metal chip. It is found that there is an optimal NGP concentration in NFCF for practical cutting applications. When the concentration of NGP is 0.4 wt%, the broaching process lubrication exhibits an ideal mixed lubricate state, resulting in minimal friction resistance, and thus, both the cutting force and chip curling angle reach their corresponding best values. Moreover, the proposed NGP-based vegetable-oil cutting fluid exhibits excellent environment-friendliness and low-cost consumption in the minimal quantity lubrication (MQL) method; this demonstrates its potential for replacing the traditional broaching cutting fluid.

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Section: Preparation Of Nfcfmentioning

confidence: 78%

Penetration and lubrication evaluation of vegetable oil with nanographite particles for broaching process

2020

Friction

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“…Chemical modification represents another approach for improving the dispersibility of graphene [75]. To enhance graphene's dispersion stability in water, an oxygen-containing functional group was grafted onto graphene sheets via oxidation.…”

Section: Two-dimensional Carbon Nanomaterials: Graphene and Gomentioning

confidence: 99%

“…This suggests that Span-80 was effective in improving the dispersion stability of graphene in the base oil. Wu et al [75] developed a dispersing method in which graphene was chemically modified by octadecylamine and dicyclohexylcarbodiimide and combined with an efficient dispersant to provide excellent dispersion stability in the base oil. The graphene (0.5 wt%) modified with dispersant (1 wt%) maintained a stable dispersion in PAO6 for up to ~120 days.…”

Section: Two-dimensional Carbon Nanomaterials: Graphene and Gomentioning

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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“…The graphene structure can be combined with other chemical structures via chemical structure. A previous study modified graphene using octadecylamine and dicyclohexylcarbodiimide [19], alkyl structure [20], and a titanate coupling agent [21]. Another method is by adding surfactants, which are an easier solution.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Behavior of Graphene and Ionic Liquid as Bio-Based Lubricant Additive

et al. 2021

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The constant utilization of petroleum-based products has prompted concerns about the environment, hence a replacement for these products must be explored. Biolubricants are a suitable replacement for petroleum-based lubricants as they provide better lubricity. Biolubricant performance can be improved by the addition of graphene. However, there are reports that graphene is unable to form a stable suspension for a long period. This study used a graphene-ionic liquid additive combination to stabilize the dispersion in a biolubricant. Graphene and ionic liquid were dispersed into the biolubricant via a magnetic stirrer. The samples were tested using a high frequency reciprocating rig. The cast iron sample was then further observed using various techniques to determine the lubricating mechanism of the lubricant. Different dispersion stability of graphene was observed for different biolubricants, which can be improved with ionic liquids. All ionic liquid samples maintained an absorbance value of three for one month. The utilization of ionic liquid was also able to decrease the frictional performance by 33%. Further study showed that by using the ionic liquid alone, the frictional could only reduce the friction coefficient by 13% and graphene could only reduce the friction by 7%. A smooth worn surface scar can be seen on the graphene-IL sample compared to the prominent corrosive spot on the IL samples and abrasive scars on graphene samples. This indicates synergistic behavior between the two additives. It was found that the ionic liquid does not only improve the dispersion stability, but also plays a role in forming the tribolayer.

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Modified graphene as novel lubricating additive with high dispersion stability in oil

Cited by 60 publications

References 33 publications

Penetration and lubrication evaluation of vegetable oil with nanographite particles for broaching process

Penetration and lubrication evaluation of vegetable oil with nanographite particles for broaching process

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

Synergistic Behavior of Graphene and Ionic Liquid as Bio-Based Lubricant Additive

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