Berlin 2008 – scientific programme

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O: Fachverband Oberflächenphysik

O 66: Metallic Nanostructures I (on Metals)

O 66.7: Talk

Thursday, February 28, 2008, 14:15–14:30, MA 041

Role of surface roughness in superhydrophobicity — •Chunyan Yang, Ugo Tartaglino, and Bo Persson — IFF, FZ-Juelich, 52425, Germany

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 nanodroplets 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 of the surface[1,2].

References: [1] C. Yang, U. Tartaglino and B.N.J. Persson, Phys. Rev. Lett. 97, 116103 (2006) [2] C. Yang, U. Tartaglino and B.N.J. Persson, arXiv:0710.3264