Tribological Performance and Rheological Properties of Engine Oil with Graphene Nano-Additives

Alqahtani, Bader; Hoziefa, W.; Hussein, H.M.A.; Ahmed, Mohamed Hamoud; Salunkhe, Sachin; Elshalakany, Abou Bakr; Abdel-Mottaleb, Mohamed; Davim, J. Paulo

doi:10.3390/lubricants10070137

Cited by 25 publications

(4 citation statements)

References 38 publications

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“…This boundary layer acts as a protective barrier, minimizing direct metal-to-metal contact and reducing the energy required for movement. In high shear rate environments, such as those encountered in engine components, the formation of this boundary layer becomes particularly significant 24 – 26 .…”

Section: Resultsmentioning

confidence: 99%

Enhanced tribological properties of diesel-based engine oil through synergistic MoS2-graphene nanohybrid additive

Nagarajan,

Sridewi,

Wong

et al. 2023

Sci Rep

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This research explores the potential of microwave-synthesized MoS2-graphene nanohybrid as additives to enhance the tribological properties of diesel-based engine oil. The synthesis method offers significant advantages, reducing both synthesis time and energy consumption by 90–98% compared to conventional approaches. The synthesized nanohybrids are characterized through FESEM, EDX, XRD, and Raman spectroscopy to understand their morphology and functional group interactions. These nanohybrids are incorporated into 20W40 engine oil following synthesis, and a comprehensive assessment of their properties is conducted. This evaluation covers critical parameters like viscosity index, stability, volatility, as well as tribological properties, oxidation resistance, and thermal conductivity of the oil-nanohybrid system. Results demonstrate that adding just 0.05 wt% of MoS2-graphene nanohybrid leads to a remarkable 58.82% reduction in friction coefficient and a significant 36.26% decrease in the average wear scar diameter. Additionally, oxidation resistance improves by 19.21%, while thermal conductivity increases notably by 19.83% (at 100 °C). The study demonstrates the synergistic effects of these nanohybrids in reducing friction and wear, enhancing oxidation resistance, and improving thermal conductivity. In conclusion, this research highlights the potential of microwave-synthesized MoS2-graphene nanohybrid as promising tribological additives for diesel engine oils. Their successful integration could significantly enhance the performance and durability of critical mechanical components in diesel engines, representing a significant advancement in lubrication technology.

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Section: Resultsmentioning

confidence: 99%

Enhanced tribological properties of diesel-based engine oil through synergistic MoS2-graphene nanohybrid additive

Nagarajan,

Sridewi,

Wong

et al. 2023

Sci Rep

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“…As the nanoparticles interact with each other and with the oil molecules, they create additional friction and resistance to flow, resulting in an overall increase in viscosity. Regarding graphene nanoadditive, the viscosity continues increasing with raising the amount of graphene in bio-oil, reaching the highest viscosity value at both operating temperatures [73,74]. This may be attributed to the agglomeration effect when introducing higher amounts of graphene inside the oil matrix, leading to a prominent increase in the collision between the nanoparticles and the bio-oil molecules [75].…”

Section: Effect Of Nanoadditive Concentrationmentioning

confidence: 98%

Enhancing the Performance of Rapeseed Oil Lubricant for Machinery Component Applications through Hybrid Blends of Nanoadditives

Nassef,

Pape,

Poll

2023

Lubricants

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Bio-lubricants have demonstrated promising tribological and physical properties, suggesting their potential advantages in the lubrication of critical machinery components. This study investigates the impact of using blended individual and hybrid nanoadditives, such as graphene nanoplatelets, ZnO, and an ionic liquid (IL) of Trihexyltetradecylphosphonium bis(2,4,4-trimethylpentyl)phosphinate, on the rheological, tribological, and physical characteristics of rapeseed oil. A commercial cutting fluid (BLASER Vasco 6000) (VB 6000) is used for comparison. The results revealed a substantial improvement in viscosity index (VI) values for mixtures containing graphene nanoplatelets, reaching up to 150%, as compared to VB 6000. Regarding the tribological behavior, the friction coefficient achieved a reduction of up to 20% at room temperature (RT) and 26% at 60 °C for the hybrid containing all three nanoadditives (H3), outperforming the commercial fluid. Moreover, H3 demonstrated the most substantial reductions in wear volume (84%) and surface roughness (60%). The wettability of H3 benefited from the combined mechanisms of the applied nanoadditives; its application the contact angle decreased by 63%, revealing its outstanding spreadability. The results reveal the high potential of the H3 hybrid as a competitive and green metal working fluid that can replace hostile and toxic ones in industrial applications.

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“…The grease temperature dropping point also increased with the nano additives. Alqahtani, 2022 [64] obtained a 20% increase in thermal conductivity on an SAE 5W-30 with a GN concentration of 0.09 wt%. See Figure 36.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Review of Graphene-Based Materials for Tribological Engineering Applications

Tomanik,

Christinelli,

Souza

et al. 2023

Eng

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Graphene-based materials have great potential for tribological applications. Graphene’s unique properties such as low shear resistance, high stiffness, and thermal conductivity make it an attractive material for improving the properties of lubricants in a wide range of industrial applications, from vehicles to house refrigerators and industrial machinery such as gearboxes, large compressors, etc. The current review aims to give an engineering perspective, attributing more importance to commercially available graphene and fully formulated lubricants instead of laboratory-scaled produced graphene and base oils without additives. The use of lubricants with graphene-based additives has produced e.g., an increase in mechanical efficiency, consequently reducing energy consumption and CO2 emissions by up to 20% for domestic refrigerators and up to 6% for ICE vehicles. Potential effects, other than purely friction reduction, contributing to such benefits are also briefly covered and discussed.

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Tribological Performance and Rheological Properties of Engine Oil with Graphene Nano-Additives

Cited by 25 publications

References 38 publications

Enhanced tribological properties of diesel-based engine oil through synergistic MoS2-graphene nanohybrid additive

Enhanced tribological properties of diesel-based engine oil through synergistic MoS2-graphene nanohybrid additive

Enhancing the Performance of Rapeseed Oil Lubricant for Machinery Component Applications through Hybrid Blends of Nanoadditives

Review of Graphene-Based Materials for Tribological Engineering Applications

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