Influence of surface roughness on superhydrophobicity

Details Influence of surface roughness on superhydrophobicity Influence of surface roughness on superhydrophobicity

2006-04-03

arxiv.org/abs/cond-mat/0604052v3

Phys. Rev. Lett. 97, 116103 (2006)

Physics

Condensed Matter

Soft Condensed Matter

5 Pages, 6 figures. Minimal changes with respect to the previous version

Scientific paper

10.1103/PhysRevLett.97.116103

Superhydrophobic surfaces, with liquid contact angle theta greater than 150 degree, 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 for nanodroplets 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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