Water has many natural advantages for using as an ecological lubricant in engineering. However, how to ensure the efficiency and stability of water lubricating film with low viscosity has been always the key point of practical applications. For this, a strategy is given to improve lubricating capacity of water under loads by combining the biomimetic adhesion and hydration lubrication of polydopamine (PDA). The PDA nanoparticles were polymerized and purified, and its aqueous suspensions were used to solve the difficult problem of lubrication failure when using water as lubricant. The morphology characteristics and lubrication performance of PDA nanoparticles were experimentally tested and analyzed. The results showed that PDA nanoparticles can form an adhesive-lubricating film on the copper balls and effectively reduce the tribological behaviors in rubbing processes. This strategy that combines the biomimetic adhesion and hydration lubrication of PDA provides a novel method to realize targeted hydrated film and excellent water lubrication under load bearing conditions.
Yi-Tao Xu,Ying Guo,Le-Xing Song,Kai Zhang,Matthew M. F. Yuen,Xian-Zhu Fu,Rong Sun,Ching-Ping Wong
Reduced graphene oxide nano-sheets encapsulated copper spherical particles (Cu@rGO) were obtained through a simple electrostatic self-assembly process followed by chemical reduction. The oxidation resistance of Cu spherical particles was considerably enhanced by the coating of rGO nano-sheets. XRD results show that the core–shell structured Cu@rGO did not exhibit any sign of oxidation in air after storage at room temperature for 70 days or after heat treatment at 130 °C for 1.5 h. Furthermore, the rGO wrapped on the surface of Cu particles could transfer the two-dimensional rGO nano-sheets into three-dimensional (3D) networks. The Cu@rGO particles with 3D structure might have promising potential applications in thermal management, electrically conductive interconnection, electrodes, etc.
危险品化学品经营许可证（带存储）