Volume 124, Number 2, October 2018
|Number of page(s)||4|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||22 November 2018|
PMMH, UMR 7636 du CNRS, ESPCI Paris, PSL Research University, Sorbonne Université, Université Paris Diderot - 75005 Paris, France and LadHyX, UMR 7646 du CNRS, Ecole polytechnique - 91128 Palaiseau, France
Received: 26 August 2018
Accepted: 15 October 2018
Rigid superhydrophobic materials have the ability to repel millimetric water drops, in typically 10 ms. Yet, most natural water-repellent materials can be deformed by impacting drops. To test the effect of deformability, we perform impacts of non-wetting drops onto thin (), circular PDMS membranes. The bouncing mechanism is markedly modified compared to that on a rigid material: the liquid leaves the substrate as it is kicked upwards by the membrane. We show that the rebound is controlled by an interplay between the dynamics of the drop and that of the soft substrate, so that we can continuously vary the contact time by playing on the membrane's characteristics and reduce it up to 70%.
PACS: 47.55.dr – Interactions with surfaces
© EPLA, 2018
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