The characteristics of droplets impacting on closed-cell hydrophobic surfaces

Abstract eng:
Super-hydrophobic surfaces with different shapes of closed-cell micro-pits are designed in this paper to study the influences of factors such as solid fraction, cell size and depth to critical pressure and droplet rebounding property. Droplets impacting on open-cell textured surfaces undergo a transition from the Cassie state to the Wenzel state whereby the surface gets impregnated by the liquid and temporarily loses its super-hydrophobicity. Cassie-to-Wenzel transition would induce the loss of super-hydrophobicity and the so-called self-cleaning effect of the substrates since a Wenzel state would lead to a strong increase of adhesion and friction properties. Owing to the preservation of air cushion in the micro-pits, droplets impacting on closed-cell ... ... ... ... ... ... ... instead of transferring into Wenzel state. Proper design of closed-cell micro-structured surfaces can delay the so-called Cassie-to-Wenzel transition and maintain hydrophobicity and water-repellency even under high-speed droplets impact.

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