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Fig. 1 Water drops on hot hydrophilic and superhydrophobic materials.

Published byΜορφευς Παπαγεωργίου Modified over 5 years ago

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Presentation on theme: "Fig. 1 Water drops on hot hydrophilic and superhydrophobic materials."— Presentation transcript:

1 Fig. 1 Water drops on hot hydrophilic and superhydrophobic materials.
Water drops on hot hydrophilic and superhydrophobic materials. (A) Water drops (Ω = 4 μl) on a hydrophilic silicon wafer (blue frame) or on a superhydrophobic Glaco-treated wafer (red frame) brought to temperature T. Scale bar, 1 mm. While boiling occurs above 100°C in the hydrophilic case, neither boiling nor apparent change in shape is observed on the repellent solid. Both drops only become similar above 210°C, in a common Leidenfrost state. (B) Lifetime τ of water drops (Ω = 20 μl) as a function of the substrate temperature T on bare aluminum (blue data) and Glaco-treated aluminum (red data). Each point is an average over at least five measurements, and error bars represent standard deviations. The Leidenfrost transition is observed at TL ≈ 210°C on the hydrophilic substrate, whereas τ(T) monotonically decreases in the repellent situation. Beyond TL, both curves superimpose. Philippe Bourrianne et al. Sci Adv 2019;5:eaaw0304 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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