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Evaluation of Dispersion Stability of Al2O3 Nanoparticles in Jatropha curcas Oil

Nowadays the lubricants functions are reducing wear, controlling friction and satisfying environmental standards. The use of bio lubricants is an alternative, due to their technical advantages over typical petroleum-based ones, such as: high lubricity, high VI, high flash point and low evaporative losses [1], so characteristics like being renewable and their biodegradability nature have made them important alternatives in different applications. However, vegetable oils have some disadvantages: low oxidation stability, low-temperatures limitations, among others [1]. In recent years, nanoparticles have started to play more important roles as lubricant additives for their potential in emission reduction and improving fuel economy [2], their characteristics size, normally less than 100 nm, allow them to enter the contact region, nanoparticles are considered thermal stable at elevated temperatures that makes them favorable as lubricant additive [2,3]. There are physical characteristics of nanoparticles that could affect the interaction with the lubricant and the contact surface as particle size and morphology [2-4]. The role of dispersion stability is very important, the nanoparticles in suspension may stick together and form agglomerates, which by gravity effect they tend to settle, if there is no good dispersion stability of nanoparticles, there will be a poor wear protection and friction reduction ability [3,5].