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The aim of this research is to investigate the enhancement of lubricating and sealant properties, increase of the life time, and reduce of wear traces for lubricants and sealant greases. For this purpose, carbon dot (C-dot) nanoparticles (NPs) were synthesized successfully to add to the lithium based grease in 0.1, 0.2, 0.4, 0.6, 0.8 and 1 wt%. To better understand the effect of NPs on the properties of lithium based grease, carbon nanofiber (CNF) and Nano-Fullerene (C60) were also used in the mentioned weight percentages to add to the lithium based. NPs were well dispersed in the phase of base grease by the use of ultra-sonication. Variety of tests were done on the lithium base grease and all of the fabricated nanogreases and their results were then compared with each other. Using NPs did not remain any corrosive tracks for all of the nano-greases and caused the improvement in all their properties. Prepared nanogreases were also resistant to fuel, water, and aqueous alcohol in a specific period of time. CNFs with weight percentages in the range of 0.4-0.8 showed to be the optimum NPs content to be added to the lithium based grease in terms of improved properties.

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