The appropriate balance between cohesive and adhesive forces results in an almost spherical drop of water standing on a surface, such as a lotus leaf. This effect is called superhydrophobicity. Many factors such as liquid type, surface and temperature will determine whether a surface/liquid combination results in a superhydrophobic effect. Students are encouraged to evaluate all the forces acting on the surface/liquid system and write inequalities that support the observations.
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Nano-Link Superhydrophobicity PowerPoint Presentation
This video is a step-by-step demonstration of how to perform the magic sand experiment.
Nano-Link Superhydrophobicity Module
Revised Sept. 2014