Motion of liquid droplets on a superhydrophobic oleophobic surface
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Developing a superhydrophobic oleophobic material is achieved by two criteria: low surface energy and properly designed surface morphology. The relationships among surface tensions, contact angles, contact angle hystereses, roll-off angles, and surface morphologies of such materials are studied. Numerical formulae related to the surface energy of liquids and solids are used to predict the wetting behavior of superhydrophobic and oleophobic materials. Using chemical and geometrical modifications, a superhydrophobic oleophobic surface was prepared. Good agreement between the predicted and measured contact angles and roll-off angles were obtained. The effect of the contact angle hysteresis on the roll-off angle is described to understand the motion of a droplet when the droplet begins to roll off.
KeywordsContact Angle Water Contact Angle Dodecane Contact Angle Hysteresis Weft Yarn
This material was sponsored by the Air Force Research Laboratory (AFRL) under grant number FA8650-07-1-5903. The U.S. Government is authorized to reproduce and distribute reprints for Governmental purposes notwithstanding any copyright notation thereon. We also appreciate support from the Defense Threat Reduction Agency-Joint Science and Technology Office for Chemical and Biological Defense (grant number HDTRA1-08-1-0049) and US Army Natick Soldier Research Development and Engineering Center (NSRDEC).
- 10.Lee HJ, Willis C (2009) Chem Ind 21Google Scholar