Effect of self-affine fractal characteristics of surfaces on wetting

摘要

In this letter, we show experimentally that the wetting property of a solid surface crucially dependsnon the surface morphological parameters such as; u00011u0002 root mean square u0001rmsu0002 roughness u0001, u00012u0002nin-plane roughness correlation length u0002, and u00013u0002 roughness exponent u0003 of the self-affine surface. Wenhave shown that the contact angle monotonically decreases with the increase in the rms local surfacenslope u0004 u0001u0005u0001/u0002u0003u0002. We have shown that the same solid surface can be made hydrophobic ornhydrophilic by merely tuning these self-affine surface morphological parameters.