Microscopy
Confinement-induced refractive index change
Equipment
Materials
Plain strain moduli for the experimental interfaces
Surface cleaning
Roughness measurement
Friction
Contact area and load-bearing area size and average thickness of liquid layer calculation
Slope, root-mean-square roughness of the surfaces, and pressure
Average thickness measurement during sliding
Viscosity as a function of specific film thickness
Predicted friction coefficient
Plasticity in glass-on-glass contacts
Calculation of the average contact pressure
Fluorescent liquid adsorption
Change of dry friction coefficient with roughness and waiting time
In fig. S4, we presented the island specific film thickness as a function of speed for smooth PS beads. Thus, we have a connection between theory for smooth surfaces [Snoeijer-Eggers-Venner theory (32), fig. S4 experimental] and theory for rough surfaces (Fig. 4B).