Figure | Unidirectional propulsion of Leidenfrost droplets on the femtosecond laser-structured heterogeneous aluminum surface. (IMAGE)
Caption
Figure | Unidirectional propulsion of Leidenfrost droplets on the femtosecond laser-structured heterogeneous aluminum surface. (a) Schematic showing the manner of laser processing of the aluminum surface and the motion trend of water droplets on the heated laser-structured sheet. (b) Schematic illustrating different positional relationships between the laser pulse-induced craters (or pits). (c-f) Laser-induced microstructures on the aluminum surface prepared at different laser-scanning speeds. (g) Motion trajectory of droplets on a heated structured aluminum sheet where the upper half region was processed via laser scanning from right to left and the lower half region was processed from left to right. The yellow dashed arrows mark the laser processing direction, while the black solid arrows indicate the droplet’s movement direction.
Credit
Jiale Yong et al.
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License
CC BY