Dual-Scale Roughness Produces Unusually Water-Repellent Surfaces


  • The financial support of the UK Engineering and Physical Sciences Research Council (EPSRC) and the MOD Joint Grant Scheme under grant GR/02184/01 is gratefully acknowledged.


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Super-hydrophobicity can be achieved on relatively smooth surfaces. Short, wide pillars on slightly rough surfaces are shown to produce super-hydrophobic surfaces (see Figure) where neither the pillars nor the slight roughness suffice alone. This use of two length scales to create super-hydrophobic surfaces directly mimics the mechanism used by some plants including the lotus.