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Wetting of Rough Surfaces

Surface topology is known to effect its wettability. The extraordinary hydrophobicity of lotus leafs is attributed to the array of nano-structures present on its surface. Thus, we may ask the question that how surface structuring effects the hydrophillicity of a hydrophilic surface?

We have studied the wettability of model rough hydrophillic pillar-arrayed surfaces. Roughness is varied by varying the inter-pillar distance and pillar width (depicted in figure below). Also, hydrophilicity of the surface is also varied by changing the non-bonded interaction parameter between surface and water.

We have observed that roughness does effect the wetting to dewetting transition. Also, there is a correlation between non-bonded interaction potential and wetting to dewetting transition.

Prithvi Raj Pandey, S. Roy, Is it Possible to Change Wettability of Hydrophilic Surface by Changing its Roughness?, J. Phy. Chem. Lett., 2013, 4(21), pp 3692-3697