1. State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, PR China
2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000, PR China
3. Qingdao Centre of Resource Chemistry and New Materials, Qingdao, Shandong 266100, PR China
4. State Key Laboratory of Solidification Processing, Centre of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China