Extended Data Fig. 1: Sliding of water droplets on OTS SAM surfaces.
From: Droplet slipperiness despite surface heterogeneity at molecular scale
a) Schematics of the sliding angle experiments. Fμ represents contact line friction, D droplet contact region diameter, ρ water density (ρ = 1.0 g cm−3), V droplet volume, g acceleration of gravity (g = 9.81 m/s2), and α tilt of the surface when the droplet starts sliding. b) Water droplet sliding angle as function of SAM coverage ranging from 0.1 molecules/nm2 to 3.8 molecules/nm2. Sliding angles were recorded with three different volumes: 5 µl, 10 µl and 20 µl. c) Droplet leaving a trailing film on a SAM with coverage below 0.1 molecules/nm2, meaning that sliding angle could not be determined below 0.1 molecules/nm2 coverage. d) Calculated contact line friction from the sliding angles as function of SAM coverage. e) Contact line friction normalized with droplet contact region diameter (Fμ/D) as function of SAM coverage. In b), d) and e), each data point represents average value of three measurements made at different locations of the SAM surfaces, and error bars represent standard deviation.
