Energy transitions in superhydrophobicity: low adhesion, easy flow and bouncing

Michael Nosonovsky, Bharat Bhushan
2008 Journal of Physics: Condensed Matter  
The concept of superhydrophobicity was introduced in the 1990s as a result of the investigation of the microstructure of extremely water-repellent plant leaves. Since that time, artificial superhydrophobic surfaces have been developed and implemented, stimulated by advances in nanotechnology, and giving one of the most successful examples of a bio-inspired technology transferred into engineering applications. Superhydrophobicity is usually defined as the ability of a surface to have (i) a very
more » ... to have (i) a very high water contact angle (CA) and (ii) low CA hysteresis. Here we argue that the ability of a water droplet to bounce off a surface constitutes a third property that is crucial for applications. Furthermore, this property is naturally related to the first two properties, since the energy barriers separating the 'sticky' and 'non-sticky' states needed for bouncing droplets have the same origin as those needed for high CA and for low CA hysteresis.
doi:10.1088/0953-8984/20/39/395005 fatcat:7ot7v2vnzjaqpkuu77xt743e3a