Novel concept of nano-additive design: PTFE@silica Janus nanoparticles for water lubrication

Abstract Polytetrafluoroethylene (PTFE) has been widely used as a lubrication additive for reducing friction and wear; however, the hydrophobic nature of PTFE restricts its application in eco-friendly water-based systems. In this study, first time, we designed novel PTFE@silica Janus nanoparticles (JNs) to meet requirement additives lubricants, which have excellent dispersion stability water attributed unique amphiphilic structure. By introducing aqueous JNs with concentration 0.5 wt%, coefficient (COF) wear volume were reduced by 63.8% 94.2%, respectively, comparing those pure water. Meanwhile, suspension also exhibits better wear-resistance performances commercial silica suspensions. The tribological behaviors nano-additives could be synergetic effect two components, where provided through formed tribofilms on pairs, rigid further enhanced performance. Most importantly, structure makes it possible use an water-lubrication Our study shed light design nanomaterials requirements future industrial applications.