Study of the tribological properties of nano lubricating oil blends for diesel engines

Kuang, Xin; Yin, Bifeng; Yang, Xiping; Jia, Huang; Xu, Bo

doi:10.1088/2399-1984/ac3ccd

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…Finally, the oil soluble graphene was obtained by centrifugal drying after being stirred for 4 h at 80 °C. Previous experimental results 27 have shown that the dispersion stability of the modified graphene lubricating oil was improved, and the modified graphene lubricating oil with 25 ppm concentration had the best tribological properties. The modified nano-graphene with a mass concentration of 25 ppm was weighed into the lubricating oil by a precision balance.…”

Section: Test Device and Methodsmentioning

confidence: 85%

“…Through the measurement of Digital Micrograph software, it can be seen that the average thickness of nano-graphene is about 0.5–1 nm, and the number of nano-graphene layers is about 1–3. Nano-graphene was chemically modified by oleic acid and stearic acid in the following ways 27 . Firstly, 0.5 g of nano-graphene was dispersed into 100 mL anhydrous ethanol.…”

Section: Test Device and Methodsmentioning

confidence: 99%

“…The research showed that nano-graphene lubricating oil with 0.05% mass fraction had better tribological properties. Kuang et al 27 used oleic acid and stearic acid to chemically modify nano-graphene, and studied the tribological properties of the cylinder liner and piston specimen, a key friction pair of the engine, under the action of nano-graphene lubricating oil. The results showed that the dispersion stability of the modified nano-graphene lubricating oil was improved, and the addition of 25 ppm mass fraction nano-graphene in the lubricating oil had the best friction and wear reduction effect.…”

Section: Introductionmentioning

confidence: 99%

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Effect of nano-graphene lubricating oil on particulate matter of a diesel engine

Kuang,

Yang,

et al. 2024

Sci Rep

Self Cite

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Nano-graphene lubricating oil with appropriate concentration shows excellent performance in reducing friction and wear under different working conditions of diesel engines, and has been widely concerned. Lubricating oil has a significant impact on particulate matter (PM) emissions. At present, there are few studies on the impact of nano-graphene lubricating oil on the physicochemical properties of PM. In order to comprehensively evaluate the impact of nano-graphene lubricating oil on diesel engines, this paper mainly focused on the effects of lubricating oil nano-graphene additives on the particle size distribution and physicochemical properties of PM. The results show that, compared with pure lubricating oil, the total number of nuclear PM and accumulated PM of nano-graphene lubricating oil is significantly increased. The fractal dimension of PM of nano-graphene lubricating oil increases and its structure becomes more compact. The average fringe separation distance of basic carbon particles decreases, the average fringe length increases. The degree of ordering and graphitization of basic carbon particles are higher. The fringe tortuosity of basic carbon particles decreases, and the fluctuation of carbon layer structure of basic carbon particles decreases. Aliphatic substances in PM are basically unchanged, aromatic components and oxygen functional groups increase. The initial PM oxidation temperature and burnout temperature increase, the maximum oxidation rate temperature and combustion characteristic index decrease, and the activation energy increases, making it more difficult to oxidize. This was mainly caused by the higher graphitization degree of PM of nano-graphene lubricating oil and the increased content of aromatic substances.

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Section: Test Device and Methodsmentioning

confidence: 85%

Section: Test Device and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of nano-graphene lubricating oil on particulate matter of a diesel engine

Kuang,

Yang,

et al. 2024

Sci Rep

Self Cite

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Susceptibility of Poly–Alpha Olefin and Diisooctyl Sebacate Base Oils With Different Polarities to Oleic Acid Surface–Capped Ultra‐Small Cerium Oxide Nanoparticle

Bian,

Song,

et al. 2024

Lubrication Science

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A key issue for nano‐additive to effectively exert tribological function is to ensure its entrance to and adhesion on the frictional contact surfaces. But the adhesion of nano‐additive on the rubbed surfaces under oil lubrication faces the challenge of the competitive adsorption of lubricant base oil thereon. In this study, oleic acid–modified ultra‐small cerium oxide (OA‐CeO2) nanoparticle was synthesised by one‐pot liquid‐phase surface‐modification method in the presence of OA as the surface modifier. The susceptibility of non‐polar poly–alpha olefin 6 (PAO6) and polar diisooctyl sebacate (DIOS) base oils to the as‐prepared OA‐CeO2 nano‐additive was investigated, and the effect of the OA‐CeO2 nano‐additive on the friction‐reducing and anti‐wear abilities of the two kinds of base oils towards a steel–steel sliding contact was investigated with four‐ball friction and wear tester. Furthermore, the tribological mechanism of the adsorption and deposition of the OA‐CeO2 nano‐additive on the surface of friction steel and the competitive adsorption of base oil were discussed. Characterisations by scanning electron microscopy, transmission electron microscopy and Fourier transform infrared spectroscopy demonstrate that the as‐prepared OA‐CeO2 nanoparticle is of a spherical shape and has an ultra‐small average size of 1.2 nm. As the lubricant additive in PAO6 and DIOS base oils, the OA‐CeO2 nano‐additive exhibits different tribological properties, which is attributed to the difference in the base oils' polarity. Namely, the CeO2 nanoparticle in the non‐polar PAO6 base oil is more easily adsorbed on the rubbed surface of the steel–steel sliding contact, thereby forming the CeO2 deposition film to improve the tribological properties of the base oil. However, the CeO2 nanoparticle added in polar DIOS base oil is difficult to form the CeO2 deposition film, because of the competitive and preferential adsorption of the polar base oil on the rubbed steel surface. Therefore, it is imperative to select the base oils with proper polarity to better exert the friction‐reducing and anti‐wear functions of the OA‐CeO2 nano‐additive.

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Performance evaluation of nano-graphene lubricating oil with high dispersion and low viscosity used in diesel engines

Kuang,

Yang,

Bian

et al. 2024

PLoS ONE

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The basic tribological experiments have reported that nano-graphene lubricating oil has excellent anti-friction and anti-wear properties, which has been widely concerned. However, the real anti-friction effect of nano-graphene lubricating oil and its impact on engine power performance, economic performance and emission performance remain to be proved. This has seriously hindered the popularization and application of nano-graphene lubricating oil in the engine field. In this paper, nano-graphene powder was chemically grafted to prepare nano-graphene lubricating oil with high dispersion stability. The influence of nano-graphene on physicochemical properties of lubricating oil was studied, and the influence of nano-graphene on engine power performance, economic performance and emission performance was explored. The results show that after modification, the dispersion of nano-graphene in lubricating oil is improved. Compared with pure lubricating oil, the addition of nano-graphene makes the kinematic viscosity of lubricating oil slightly lower, and has little effect on the density, flash point, pour point and total acid value of lubricating oil. The reversed towing torque of nano-graphene lubricating oil is reduced by 1.82–5.53%, indicating that the friction loss decreases. The specific fuel consumption of the engine is reduced, which indicates that the fuel economic performance is improved. Engine HC+NOX, CH4, CO2 emissions do not change much, but particulate matter (PM) emissions increase by 8.85%. The quantity concentration of nuclear particles, accumulated particles and total particles of nano-graphene lubricating oil are significantly higher than that of pure lubricating oil. And the increase of the quantity concentration of accumulated particles is more obvious than that of nuclear particles, and the larger the load, the more obvious this phenomenon. In order to apply nano-graphene lubricating oil to the engine, it is also necessary to further study its impact on the post-processing system, adjust the control strategy of the post-processing system and then test and calibrate.

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Study of the tribological properties of nano lubricating oil blends for diesel engines

Cited by 3 publications

References 26 publications

Effect of nano-graphene lubricating oil on particulate matter of a diesel engine

Effect of nano-graphene lubricating oil on particulate matter of a diesel engine

Susceptibility of Poly–Alpha Olefin and Diisooctyl Sebacate Base Oils With Different Polarities to Oleic Acid Surface–Capped Ultra‐Small Cerium Oxide Nanoparticle

Performance evaluation of nano-graphene lubricating oil with high dispersion and low viscosity used in diesel engines

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