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Figure 1

From: Self-propelled droplet transport on shaped-liquid surfaces

Figure 1

Wetting on liquid surfaces. (a) Water droplet on a low-hysteresis liquid surface obtained by imbibing an hydrophobic nano-particles coating with silicon oil. The scale bar is 1 mm. (inset) Diagram presenting the surface tensions acting at the droplet edges. (b) Water droplet on a liquid surface shaped with rectangular rails. The fraction of the sample covered by the rails is \(f_s=0.18\). Pockets of air are trapped underneath the droplet, modifying its apparent contact angle. The scale bar is 1 mm. (inset) Illustration of the expected oil distribution. (c) Droplet apparent contact angle, \(\theta\), as a function of the rail fraction \(f_s\), for \(5\, \upmu {\hbox {L}}\) water droplets deposited on shaped liquid surfaces. Error bars are the standard deviation over eight measures. (Blue) dashed line is Eq. (2) with \(f_l = f_s + 0.059\). (Green) dashed-dotted line is the Cassie–Baxter equation for a textured oil-free super-hydrophobic surface. Additional measurements are shown on Supplementary Fig. S4.

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