Studies on tribological behaviour of ZnO nanorods suspended in SAE 20w 40 engine oil

Rajkumar, R.; Kiruthiga, K.; Induja, S.; Raghavan, P.S.; Shafee, Mohammed; Pandiyan, P.; Sathyamurthy, Ravishankar; Sekhar, S. Chandra; Kabeel, A.E.

doi:10.1016/j.ssc.2021.114235

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…Zhang et al [ 43 ] found that WS 2 nanorods as a lubricant additive exhibit good friction reduction and antiwear properties with both friction film and “rolling bearing” effects. Rajkumar et al [ 44 ] showed that 0.02 wt% of ZnO nanorods significantly reduced the friction coefficient of SAE (20W-40) engine oil by about 27.6%. The better lubrication performance compared with spherical ZnO nanoparticles is due to the fact that ZnO nanorods have a larger contact area and are subjected to the weaker shearing action of the lubricating fluid, resulting in a higher binding ability to the surface.…”

Section: Single Nanoadditivementioning

confidence: 99%

“…Unlike the dominant role of CNTs’ “rolling bearing” effect, the friction reduction and antiwear performance of one-dimensional metal compounds generally depend on the formation of friction-protective films under high stress. Therefore, increasing the concentration of metal compounds to a certain extent is beneficial for forming more uniform and complete protective films to improve lubrication performance [ 43 , 44 , 45 , 46 , 47 , 48 , 49 ].…”

Section: Single Nanoadditivementioning

confidence: 99%

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A Review of Nanomaterials with Different Dimensions as Lubricant Additives

et al. 2022

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Lubricant additives can effectively enhance the performance and environmental adaptability of lubricants and reduce the energy loss and machine wear caused by friction. Nanomaterials, as important additive materials, have an essential role in the research and development of new lubricants, whose lubrication performances and mechanisms are not only related to their physical and chemical properties, but also influenced by the geometric shape. In this paper, the friction reduction and antiwear performances of nanomaterials as lubricant additives are first reviewed according to the classification of the dimensions, and their lubrication mechanisms and influence rules are revealed. Second, the recent research progress of composite nanomaterials as lubrication additives is introduced, focusing on their synergistic mechanism to improve the lubrication performance further. Finally, we briefly discuss the challenges faced by nanoadditives and provide an outlook on future research. The review expects to provide new ideas for the selection and development of lubricant additives to expand the application of nanoadditives.

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Section: Single Nanoadditivementioning

confidence: 99%

Section: Single Nanoadditivementioning

confidence: 99%

A Review of Nanomaterials with Different Dimensions as Lubricant Additives

et al. 2022

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“…Then, the kinematic viscosity was measured at standard characteristics temperatures of 40°C and 100°C. Accordingly, the base oil and nano lubricants viscosity index was calculated using the following equation, based on standard ASTM D-7042 [10,22] and ASTM D-2270 [6,15,24].…”

Section: Measuring Of Viscosity and Viscosity Indexmentioning

confidence: 99%

“…Then, the produced nano-lubricants will have enhanced viscosity, rheological properties, and thermal conductivity [21][22][23]. Rajkumar et al [24], Dalkılıç et al [25], and Choi et al [26] observed that the nanolubricating oil has a high ability to form an oil thin film. This film will adhere to the moving parts for a longer time and provide superior protection against wear and friction problems.…”

Section: Introductionmentioning

confidence: 99%

Deep Understanding of the Mechanism and Thermophysical Properties of Prepared Nanofluids Lube Oil Stock-60 with Al2O3 NPs

Awad¹,

Sukkar²,

Jaed³

2022

JASN

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Iraqi petroleum refineries produce large quantities of base lubricating oils (lube oils). Managing the influence of nano-additives on the lube oil nanofluids is required deep understanding to explain the resulting new specifications of produced nano-lubricants. The present study investigated the effect of Al2O3 NPs addition on the thermal properties of lube oil stock-60. Different mass additions of 0.25, 0.65, 1.05, 1.45, and 1.85 wt.% of Al2O3 NPs at operating temperatures of 20-50°C were evaluated. Also, the thermal conductivity coefficient of the prepared nanofluid was studied at the full range of the experimental temperatures (20-50°C). It was noted that the addition of Al2O3 NPs improved the thermal properties of the prepared nano-lubricant due to the high thermal conductivity of the added Al2O3 NPs. Moreover, the greatest improvement in the thermal conductivity of modified nano-lubricating oil was 13.02% at added Al2O3 mass fraction of 1.85%. The results indicated that the viscosity index of the prepared nano-lubricant was improved dramatically with Al2O3 NPs addition increase at measured standard temperatures of 40 and 100°C. The viscosity index of lubricant nanofluid is increased up to 2.46% at a weight fraction of 1.85%. The flashpoint increased by 1.33, 3.54, 5.75, 7.52, and 9.73% for mass fraction of 0.25, 0.65, 1.05, 1.45, and 1.85 wt.%, respectively. Furthermore, the highest flashpoint value was 248 o C of prepared nanofluid lube oil with 1.85 wt.% of Al2O3 NPs. Finally, the produced nano-lubricating oil has high operating quality with economic feasibility. Furthermore, an accurate correlation for predicting the viscosity of both types of nano-lubricants was provided.

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