Wetting on smooth micropatterned defects

Details Wetting on smooth micropatterned defects Wetting on smooth micropatterned defects

2011-01-05

arxiv.org/abs/1101.0915v1

Appl. Phys. Lett. 99, 184101 (2011)

Physics

Fluid Dynamics

4 pages, 4 figues, 1 table

Scientific paper

10.1063/1.3657140

We develop a model which predicts the contact angle hysteresis introduced by smooth micropatterned defects. The defects are modeled by a smooth function and the contact angle hysteresis is explained using a tangent line solution. When the liquid micro-meniscus touches both sides of the defect simultaneously, depinning of the contact line occurs. The defects are fabricated using a photoresist and experimental results confirm the model. An important point is that the model is scale-independent, i.e. the contact angle hysteresis is dependent on the aspect ratio of the function, not on its absolute size; this could have implications for natural surface defects.

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