Abstract

Controlling the impact dynamic behavior of a water-in-oil compound drop is vital for applications such as the enhancement of printing resolution and the preparation of innovative liquid-separation materials and devices. A phase diagram is constructed between the impact behavior, Weber number, and equilibrium contact angle of the water drop. The dynamic impact behavior of water-in-oil compound drops can be effectively controlled by changing the surface wettability using the dielectrowetting effect. The maximum spreading factor βm at different wettabilities shares a similar scale law βm∝We0.17 for 45.75 < We < 299.62 and βm∝We0.23 for 385.38 < We < 1183.19. Finally, the relationship between the velocity and radius of the rebounded drops was consistent with the results for pure water drops. Our findings indicate that the impact behavior of water-in-oil compound drops can be controlled at the right time scales using a dielectrowetting substrate; this is applicable in industries such as printing and liquid separation.

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