Bidirectional motion of droplets on gradient liquid infused surfaces

Muhammad Subkhi Sadullah, Gaby Launay, Jayne Parle, Rodrigo Ledesma-Aguilar, Yonas Gizaw, Glen McHale, Gary George Wells, Halim Kusumaatmaja

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32 Scopus citations


The current paradigm of self-propelled motion of liquid droplets on surfaces with chemical or topographical wetting gradients is always mono-directional. In contrast, here, we demonstrate bidirectional droplet motion, which we realize using liquid infused surfaces with topographical gradients. The deposited droplet can move either toward the denser or the sparser solid fraction area. We rigorously validate the bidirectional phenomenon using various combinations of droplets and lubricants, and different forms of structural/topographical gradients, by employing both lattice Boltzmann simulations and experiments. We also present a simple and physically intuitive analytical theory that explains the origin of the bidirectional motion. The key factor determining the direction of motion is the wettability difference of the droplet on the solid surface and on the lubricant film.
Original languageEnglish (US)
JournalCommunications Physics
Issue number1
StatePublished - Dec 1 2020
Externally publishedYes

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Generated from Scopus record by KAUST IRTS on 2023-10-23


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