1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
2. Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai, Yantai 264006, China
3. Institute for Engineering Design and Product Development, Tribology Research Division, TU Wien, Vienna 1060, Austria
4. Key Laboratory of Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials (Ministry of Education), Shandong University, Jinan 250100, China