Nanodiamond-based Nanolubricants: Experiment and Modeling

Abstract

Our recent efforts using primarily nanodiamonds as lubricant additives are discussed. For traditional high performance engine oils, our results show a reduction in friction for steel surfaces for both laboratory experiments under controlled conditions and in a pilot study of passenger cars under typical driving conditions. Examination of the surfaces suggests that surface polishing at the sub-micron scale may be responsible for these results. A separate set of experiments using a quartz crystal microbalance to measure dissipation and drag due to friction has shown that when added to water the charge of the nanodiamond acquired from surface functionalization can have a large influence on uptake and friction at the water-metal interface. More importantly, these results suggest the possibility of creating nanodiamonds with controllable frictional drag at the solid-liquid interface through surface processing. Companion simulation results for nanodiamonds in water sliding between diamond surfaces are also presented. Future possibilities for further understanding and tuning the properties of nanodiamonds as lubricant additives through synergistic experiments and modeling are also discussed.

Nanodiamond: A high impact nanomaterial

“…Diamond has long been used as a polishing agent, particularly in the metallographic analysis field due to its high wear resistance and hardness. The strong diamond core therefore makes NDs a valuable lubricant additive, and numerous studies have shown improvements in tribological properties, both in reduction of overall wear and friction [15,[30][31][32][33]. Moreover, the reduction in friction associated with the fine polishing provided by NDs has been shown to promote an increase in fuel efficiency for both diesel and gasoline based vehicles.…”