Carbon Nanotube-Enhanced Nanolubricants: Stability and Performance Improvements for Automotive Use | ||||
| Egyptian Journal of Chemistry | ||||
| Volume 68, Issue 7, July 2025, Page 379-385 PDF (424.54 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2024.322956.10488 | ||||
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| Authors | ||||
Dalal Alnajjar  1; Sherif Elsoudy2; Nessren M. Farrag1
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| 1The British University in Egypt, Department of Chemical Engineering, Egypt, 11837 | ||||
| 2The British University in Egypt, Department of Mechanical Engineering, Egypt, 11837 | ||||
| Abstract | ||||
| Nanotechnology has been a promising technology over the years. Carbon nanotubes (CNTs) are one of the principal technologies that are developed in the nanotechnology sector. This study investigated the implementation of CNTs as additives in automotive lubricants, focusing on their impact on performance metrics. The dispersion of CNTs in lubricants is influenced by several factors, the most critical of which is the dispersion stability. Key findings include improved dispersion stability of CNTs in lubricants through adding surfactants like oleic acid, which effectively managed the aggregation issues. The CNT-enhanced lubricants exhibited superior tribological, thermophysical and rheological properties compared to the bare sample of the lubricant. Notably, the pour point was reduced from -30.5°C for the bare sample to -32°C for the treated sample, indicating enhanced low-temperature performance. Moreover, a zero cloud point value was detected too. For the viscosity test, a value around 78 mPas was obtained indicating reduction in wear and friction. Additionally, the four ball test with smoother curve showcased a better lubrication performance after applying CNTs. The noticeable improvements in the lubricant for automotive use suggested that dispersing CNT in lubricant can significantly increase the internal combustion engine efficiency. While challenges in achieving stable CNT dispersion remain, due to the easy agglomeration of nanoparticles creating non-dispersible aggregate complexes. However, the addition of surfactants presents a promising solution. Overall, CNTs demonstrated substantial potential as lubricant additive for automotive applications, exhibiting measurable enhancements in the critical performance metrics that could yield additional advantages in fuel economy and engine performance. | ||||
| Keywords | ||||
| Nanotechnology; Carbon nanotubes; Oleic acid; Lubricants | ||||
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