Effect of self-affine fractal characteristics of surfaces on wetting

Sarkar, S.; Patra, S.; Gayathri, N.; Banerjee, S.
February 2010
Applied Physics Letters;2/8/2010, Vol. 96 Issue 6, p063112
Academic Journal
In this letter, we show experimentally that the wetting property of a solid surface crucially depends on the surface morphological parameters such as; (1) root mean square (rms) roughness σ, (2) in-plane roughness correlation length ξ, and (3) roughness exponent α of the self-affine surface. We have shown that the contact angle monotonically decreases with the increase in the rms local surface slope ρ (∝σ/ξα). We have shown that the same solid surface can be made hydrophobic or hydrophilic by merely tuning these self-affine surface morphological parameters.


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