The influence of surface roughness on superhydrophobicity

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  • 3 April 2006
Abstract
Superhydrophobic surfaces, with liquid contact angle theta greater than 150 deg, have important practical applications ranging from self-cleaning window glasses, paints, and fabrics to low friction surfaces. Many biological surfaces, such as the lotus leaf, have hierarchically structured surface roughness which is optimized for superhydrophobicity through natural selection. Here we present a molecular dynamics study of liquid droplets in contact with self-affine fractal surfaces. Our results indicate that the contact angle depends strongly on the root-mean-square surface roughness amplitude but is nearly independent of the fractal dimension D_f of the surface.

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