Fig. 3: Dynamic friction of CF3 fletched PDMS brushes.
(a) Schematic illustration of the droplet sliding experiment. b Time-lapsed images of a 10 μL tetradecane droplet sliding on the CF3 fletched and methyl capped PDMS brushes at a tilting angle of 10°. Scale bar: 1 mm. c Advancing and receding contact angles for CF3 fletched and methyl capped PDMS brushes as a function of surface tension, for tetradecane, dodecane, decane, octane and heptane. The contact angle hysteresis is labeled next to each set of advancing/receding contact angles. Here N = 5 and the data is the mean ± 1 std. d The dynamic friction coefficient μ for CF3 fletched and methyl capped PDMS brushes for different low surface tension liquids. For heptane, because the methyl capped PDMS brushes were completely wetted (i.e., θadv = θrec = 0°), the receding velocity was 0 mm/s for all tilting angles, resulting in an infinite dynamic friction coefficient (also see Supplementary Fig. 8). Here N = 6 and the data is the mean ± 1 std.
