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Reference.org
Superhydrophobic coating
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<p>A superhydrophobic coating is a thin surface layer that repels water. It is made from superhydrophobic (also known as <a href="/facts/Ultrahydrophobicity/c6t3L058">ultrahydrophobic</a>) materials, and typically cause an almost imperceptibly thin layer of air to form on top of a surface. Droplets hitting this kind of coating can fully rebound. Generally speaking, superhydrophobic coatings are made from composite materials where one component provides the roughness and the other provides low <a href="/facts/Surface_energy/FYQruNIK">surface energy</a>. </p><p>Superhydrophobic coatings are also found in nature; they appear on plant leaves, such as the <a href="/facts/Nelumbo_nucifera/gQUJV3wG">lotus leaf</a>, and some insect wings. </p>