Abd Elhaseeb, Diaa M.Ali, Mohamed Kamal AhmedEzzat, Muhammad FawzyMourad, Mohammad Aboulfotoh2022-06-282022-06-282022Abd Elhaseeb, D. M., Ali, M. K. A., Ezzat, M. F., Mourad, M. (2022). A review of the tribological properties of nanoparticles dispersed in bio-lubricants. Proceedings of the Institution of Mechanical Engineers Part J-Journal of Engineers Tribology.1350-6501https://doi.org/10.1177/13506501221108125https://hdl.handle.net/20.500.12713/2956Mineral oil resources are dwindling and the mineral-based lubricants are not compatible with the environment, and thus there is great interest in replacing them with bio-based lubricants. Automotive engines are an important application for bio-lubricants. In this context, this review investigates recent advances and research gaps in automotive-related applications of bio-based lubricants. The main objective of the current article is to review the tribological and thermophysical properties of nanoparticles in bio-oils, which could be used as a reference in the future development of bio-lubricants. The various nanomaterials, concentrations, surfactants, and mixing techniques have been presented. The key mechanisms which can result in superior tribological and thermal behavior of bio-lubricants are explained. Studies on the tribo-chemical reactions and between nano-additives and bio-oils are included in this review. It was reported that the tribological and thermophysical performance of bio-oils could be improved especially after adding nanomaterials according to the recent studies results. Furthermore, the major challenges for developing bio-lubricants performance are illustrated. Our present review assists in providing a basis to select bio-oils, nano-additives, and chemical processing according to their tribological properties.eninfo:eu-repo/semantics/closedAccessBio-lubricantsNanoparticlesFrictionWearTribofilmOxidation StabilityReview ArticleWOS:0008130800000012-s2.0-85132124971Q310.1177/13506501221108125Q2