Bouncing or sticky droplets: Impalement transitions on superhydrophobic micropatterned surfaces

By Denis Bartolo, Farid Bouamrirene, E. Verneuil, A. Buguin, P. Silberzan, S. Moulinet. 2005

602 citations recorded by the source corpus.

When a liquid drop impinges a hydrophobic rough surface it can either bounce off the surface (fakir droplets) or be impaled and strongly stuck on it (Wenzel droplets). The analysis of drop impact and quasi-static “loading” experiments on model microfabricated surfaces allows to clearly identify the forces hindering the impalement transitions. A simple semi-quantitative model is proposed to account for the observed relation between the surface topography and the robustness of fakir non-wetting states. Motivated by potential applications in microfluidics and in the fabrication of self-cleaning surfaces, we finally propose some guidelines to design robust superhydrophobic surfaces.

Subfields: Computational Mechanics, Mechanics of Materials, Surfaces, Coatings and Films

View Paper: https://www.semanticscholar.org/paper/e3fe828b604401ff2221d18d32b51f546b482f81

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In Computational Mechanics

In Mechanics of Materials

In Surfaces, Coatings and Films

Citations in the corpus

Oblique impacts of water drops onto hydrophobic and superhydrophobic surfaces: outcomes, timing, and rebound maps (2014, background): “1b), in which the surface is completely wetted by the liquid (Reyssat et al. 2006; Bartolo et al. 2006).”
Natural and biomimetic artificial surfaces for superhydrophobicity, self-cleaning, low adhesion, and drag reduction (2011, background): “In addition, the transition can occur by applying external pressure to the droplet, or by the impact of a droplet on the patterned surfaces [178,125,11,177, 103,105,163].”
Slip on Superhydrophobic Surfaces (2010, background): “More recently, Reyssat et al. (2006) and Bartolo et al. (2006) demonstrated that above a critical impact velocity, the impacting drop cannot be supported completely in the Cassie state as the supported air-water interface is driven into the Wenzel state by the force of impact.”
The hydrodynamics of water-walking arthropods (2010, background): “…by a leg stroke at speed U and the hydrostatic pressure ρgL associated with submergence to a depth L must be less than P = σ/δ, where δ is the characteristic lateral scale of the cuticle roughness (or P = σh/δ2 if the roughness amplitude h < δ) (a) (b) (Bartolo et al. 2006; Reyssat et al. 2006).”