1. Center of Advanced Lubrication and Sealing Materials, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
2. Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong 00000,SAR, China
3. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China