Thermophysical and tribological behaviors of multiwalled carbon nanotubes used as nanolubricant additives

Elagouz, Ahmed; Ali, Mohamed Kamal Ahmed; Hou, Xiaofan; Abdelkareem, Mohamed A. A.

doi:10.1088/2051-672x/ac28a8

Cited by 7 publications

(5 citation statements)

References 90 publications

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“…To verify the control effect of switching modes under different road surfaces, the project team built a quarter-vehicle model test bench with two degrees of freedom, as shown in Figure 14 [ 47 , 48 ]. The controller is used to control the speed and rotation direction of the motor, and the motor changes the spatial transmission direction through the gear mechanism to realize the reciprocating motion control of the active suspension.…”

Section: Simulation and Test Verificationmentioning

confidence: 99%

Study on Multi-Mode Switching Control Strategy of Active Suspension Based on Road Estimation

Liu

et al. 2023

Sensors

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In this paper, the least squares method is used to determine the vertical height of the road space domain. Based on the road estimation method, the active suspension control mode switching model is constructed, and the dynamic characteristics of the vehicle in comfort, safety, and integrated modes are analyzed. The vibration signal is collected by the sensor, and the parameters such as vehicle driving conditions are solved for in reverse. A control strategy for multiple mode switching under different road surfaces and speeds is constructed. At the same time, the particle swarm optimization algorithm (PSO) is used to optimize the weight coefficients of LQR control under different modes, and the dynamic performance of vehicle driving is comprehensively analyzed. The test and simulation results show that the road estimation results under different speeds in the same road section are very close to the results obtained by the detection ruler method, and the overall error is less than 2%. Compared with the active suspension controlled by passive and traditional LQR, the multi-mode switching strategy can achieve a better balance between driving comfort and handling safety and stability, and also improve the driving experience more intelligently and comprehensively.

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Section: Simulation and Test Verificationmentioning

confidence: 99%

Study on Multi-Mode Switching Control Strategy of Active Suspension Based on Road Estimation

Liu

et al. 2023

Sensors

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“…MWCNTs also improve lubricant stability by acting as antioxidants, which reduce oxidation and degradation . MWCNTs as lubricant additives help build advanced nanolubricants with better antifriction and antiwear capabilities than conventional lubricants. − …”

Section: Introductionmentioning

confidence: 99%

Ultrasonics-Aided Dispersion of 1D Nanocarbons in Lubricating Oils For Enhanced Lubrication

Ravikiran,

Padya,

Jain

et al. 2024

Ind. Eng. Chem. Res.

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This work reports ultrasonics-aided dispersion of onedimensional (1D) multiwalled carbon nanotubes (MWCNTs) in an additive-free mineral base oil (BO) (group-2 dewaxed N500) and a commercial synthetic engine oil (CO) (ENI TriStar 15W40) to improve the oils' friction and wear-preventive properties. The lubricant additives, i.e., the MWCNTs, were prepared using a customized vertical fluidized bed reactor. The MWCNTs improved the BO's friction and wear-preventive properties and functioned synergistically with the predispersed additives in CO. Dispersing 0.1 wt % of the MWCNTs in BO improved the latter's antifriction property by 64%, and dispersing 0.1 wt % of MWCNTs in CO resulted in the reduction of the coefficient of friction (CoF) by 48%. The wear-preventive properties of the BO and CO improved by 60% and 30%, respectively, because of the addition of 0.1 wt % of MWCNTs. This work also clarifies the processes that improve lubrication performance, thereby decreasing friction and wear. This study advances the practical use of ultrasonication in process intensification in preparing stable 1D nanocarbon-additive lubricants with enhanced lubricating properties.

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“…Nanolubricants also help mitigate the environmental issues associated with the use of conventional additives containing sulfur, chlorine, and phosphorus 12 . Owing to their extraordinary mechanical properties and good chemical stability, carbon nanotubes (CNTs) have gained significant research interest for improving the tribological properties of engine oils 7 , 13 , 14 . CNTs can self-assemble in lubricating zones owing to their unique morphology.…”

Section: Introductionmentioning

confidence: 99%

Reducing particulate emissions by using advanced engine oil nanoadditives based on molybdenum disulfide and carbon nanotubes

Bojarska,

Goławska,

Mazurkiewicz-Pawlicka

et al. 2023

Sci Rep

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Nanoadditives can be used to enhance lubricating properties of engine oils. Although many additives have been developed, molybdenum disulfide and carbon nanotubes have attracted significant attention. In this study, we demonstrate that hybrid nanostructures based on these unique materials (MoS2/CNTs) positively affect engine oil lubricating properties. Hybrid nanostructures were produced via wet chemical synthesis in impinging jet reactor. This method is characterized by easy scalability and possible continuous operation, which are crucial in material commercialization. The application of 0.5 wt% suspension exhibited the best results, reducing the friction coefficient at the engine operating temperature by up to 26%. Nanoadditives protected the lubricated parts, causing their wear to be considerably lower than the base oil. The effect of nanoadditives on the quality of exhaust gases was also investigated, which has not yet been researched. The application of the oil with MoS2/CNT reduced the emissions of solid particles in the gasoline engine exhaust gas. The total volume of particles in the exhaust gas was reduced by 91% and 49% under idling and load-running conditions. This research showed that MoS2/CNTs can be successfully used as nanoadditives in engine oils for improving tribological properties, enhancing anti-wear performance, and reducing particle emissions in exhaust gas.

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Thermophysical and tribological behaviors of multiwalled carbon nanotubes used as nanolubricant additives

Cited by 7 publications

References 90 publications

Study on Multi-Mode Switching Control Strategy of Active Suspension Based on Road Estimation

Study on Multi-Mode Switching Control Strategy of Active Suspension Based on Road Estimation

Ultrasonics-Aided Dispersion of 1D Nanocarbons in Lubricating Oils For Enhanced Lubrication

Reducing particulate emissions by using advanced engine oil nanoadditives based on molybdenum disulfide and carbon nanotubes

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