Figure | Mechanism of unidirectional self-propulsion of the Leidenfrost droplets on the laser-designed heterogeneous structures. (IMAGE)
Caption
Figure | Mechanism of unidirectional self-propulsion of the Leidenfrost droplets on the laser-designed heterogeneous structures. (a) Schematic of a droplet on a heated heterogeneous surface. (b) Schematic of the droplet’s state over the heated non-ablated smooth region. (c) Schematic of the droplet’s state over the heated ripple microstructures. During the intermittent contact between the bottom of the droplet and the peak parts of the ripple microstructures, the asymmetric ejection of vapour flow and tiny satellite droplets occurs violently at the localised hot spots on the droplet bottom. (d) Schematic of the formation process of periodic asymmetric ripple microstructures during femtosecond laser direct writing. (e) Schematic of the unbalanced Young’s force generated by asymmetric contact angles at both sides of a droplet.
Credit
Jiale Yong et al.
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