... details1State Key Laboratory of Solid Lubrication, Lanzhou Institute of ChemicalPhysics, Chinese Academy of Sciences, Lanzhou 730000, China.2KeyLaboratory of Colloid and Interface Chemistry, Shandong ... lubricated byall four samples were measured, as shown in Figure 9.The friction coefficients of samples 1 and 2 in Table 1fiercely fluctuate in running -in period during test in Figure 9a, indicating ... University, Ministryof Education, Jinan 250100, China.3Graduate School of Chinese Academy ofSciences, Beijing 100039, China.Authors’ contributionsBW did the synthetic and characteristic job in...