Abstract
We prepared a graphene/ionic liquid (G/IL) composite material by the hybridization of G and an IL for use as a lubricating oil additive. The friction coefficient and wear volume of a base oil containing 0.04 wt% of the G/IL composite was reduced by 45% and 90%, respectively. Furthermore, the base oil containing the G/IL composite exhibited better lubricating properties than the base oil containing G, IL, or a mixture of IL and G at the same mass fraction. A synergistic lubrication mechanism was also revealed. The G/IL composite was adsorbed and deposited on the wear surface, forming a more ordered protective film and a unique tribochemical reaction film during rubbing. Therefore, the G/IL composite exhibited the synergistic lubricating effects of G and IL, which significantly improved the lubricating performance of the base oil. This study also suggested a way to limit the out-of-plane puckering of G at the macroscale.
Highlights
Excessive wear directly degrades the stability, safety, and reliability of mechanical equipment [1]
The average friction coefficient and wear volume of the base oil containing the graphene/ionic liquid (G/ionic liquid (IL)) composite were reduced by 45% and 91%, respectively, compared with those of PAO6
The friction coefficient and wear volume of the base oil with 0.04 wt% of the G/IL composite were reduced by 45% and 90%, respectively
Summary
Excessive wear directly degrades the stability, safety, and reliability of mechanical equipment [1]. The use of lubricants is an effective method of controlling friction and wear in mechanical equipment. Various additives (e.g., zinc dialkyldithiophosphate and metallo-organic compounds) are used to improve the lubricating performance of lubricants to meet the stricter requirements of modern industry. These additives contain toxic substances such as sulfur and phosphorus, which can seriously affect the environment. Owing to its excellent electrical and optical properties, atomic thickness, good mechanical properties, and layered structure with low shear strength, G can be used in a wide range of applications, such as solar cells, supercapacitors, catalysts, sensors, and lubricants [7−10]. In 2001, Ye et al [13] used an ionic liquid (IL) as a lubricant for various
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call