1. State Key Laboratory
of Solid Lubrication Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Rd, 730000 Lanzhou, China
2. University
of Chinese Academy of Sciences, 100049 Beijing, China
3. Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, NL-6703
HB Wageningen, The Netherlands