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Theses

Drops on Liquid-Infused Solids

Abstract : A textured solid infused with a liquid comprises a class of materials in between a liquid and a solid. Unlike classical solids, these materials typically exhibit extraordinarily little adhesion, due to the marginal role of pinning sites. Their liquid-like nature, owing to the trapped infusion, also makes them exceptionally slippery to drops of other non-miscible liquids. In this thesis, we experimentally investigate the original spreading, adhesion and frictional behaviour of these special materials, the physics of which we capture with the construction of scaling laws, wherever possible. In the first section, we show that infused solids, despite their celebrated slipperiness, slow down the spreading of a water drop in comparison to classical solids. The situation, however, is opposite for viscous drops, where spreading can be substantially enhanced by slip at the oil/drop interface. In both cases, we find that the laws of spreading on infused solids preserve the structure of the laws established on bare solids, even if the speed can be tuned by the viscosity ratio of the drop and infused oil. In the second section, we demonstrate that contrary to the vanishing lateral adhesion of these materials, their vertical adhesion is remarkably high. The dynamical adhesion of these solids can be utilized to create a viscous tweezer for water droplets. Finally in the third section, we discuss the friction properties of liquid-infused solids towards solid beads, and describe in particular how these rolling spheres drag a tail behind them
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  • HAL Id : tel-03531222, version 1

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Saurabh Nath. Drops on Liquid-Infused Solids. Physics [physics]. Université Paris sciences et lettres, 2021. English. ⟨NNT : 2021UPSLS075⟩. ⟨tel-03531222⟩

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