Research Article

Effect of Surface Roughness and Particle Size on Lubrication Mechanisms of SiO2 Nanoparticles

Figure 11

The lubrication mechanisms of SiO2 nanoparticles under different height-diameter ratios (a) λ: 1, (b) λ: 6, and (c) λ: 20.
(a)
(b)
(c)