Lifting a sessile oil drop from a superamphiphobic surface with an impacting one

Olinka Ramírez-Soto, Vatsal Sanjay, Detlef Lohse, Jonathan T. Pham*, Doris Vollmer*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Colliding drops are encountered in everyday technologies and natural processes, from combustion engines and commodity sprays to raindrops and cloud formation. The outcome of a collision depends on many factors, including the impact velocity and the degree of alignment, and intrinsic properties like surface tension. Yet, little is known on binary impact dynamics of low-surface-tension drops on a low-wetting surface. We investigate the dynamics of an oil drop impacting an identical sessile drop sitting on a superamphiphobic surface. We observe five rebound scenarios, four of which do not involve coalescence. We describe two previously unexplored cases for sessile drop liftoff, resulting from drop-on-drop impact. Numerical simulations quantitatively reproduce the rebound scenarios and enable quantification of velocity profiles, energy transfer, and viscous dissipation. Our results illustrate how varying the offset from head-on alignment and the impact velocity results in controllable rebound dynamics for oil drop collisions on superamphiphobic surfaces.
Original languageEnglish
Article numbereaba4330
JournalScience advances
Issue number34
Publication statusPublished - 19 Aug 2020

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