Patent ID: 6852390

Claim:
An ultraphobic surface comprising: a substrate having a surface with a multiplicity of substantially uniformly shaped asperities thereon, each asperity having a common asperity rise angle relative to the substrate, the asperities positioned so that the surface has a contact line density measured in meters of contact line per square meter of surface area equal to or greater than a contact line density value “Λ L ” determined according to the formula: Λ L = - 10 ⁢ , ⁢ 330 γcos ⁡ ( θ a , 0 + ω - 90 ⁢ ° ) where γ is the surface tension of a liquid in contact with the surface in Newtons per meter, θ a,0 is the experimentally measured true advancing contact angle of the liquid on the asperity material in degrees, and ω is the asperity rise angle in degrees, wherein the surface exhibits a liquid-solid-gas interface with the liquid at a pressure of at least one atmosphere.