Bidirectional motion of droplets on gradient liquid infused surfaces

Sadullah, Muhammad Subkhi, Launay, Gaby, Parle, Jayne, Ledesma Aguilar, Rodrigo, Gizaw, Yonas, McHale, Glen, Wells, Gary and Kusumaatmaja, Halim (2020) Bidirectional motion of droplets on gradient liquid infused surfaces. Communications Physics, 3 (1). p. 166. ISSN 2399-3650

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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.

Item Type: Article
Additional Information: Funding Information: M.S.S. is supported by an LPDP (Lembaga Pengelola Dana Pendidikan) scholarship from the Indonesian Government. H.K. acknowledges funding from EPSRC (grant EP/ P007139/1) and Procter and Gamble. G.G.W. and G.L. acknowledge funding from EPSRC (grant EP/P026613/1).
Subjects: F900 Others in Physical Sciences
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 10 May 2022 14:50
Last Modified: 10 May 2022 15:00

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