Transparent, Flexible, Superomniphobic Surfaces with Ultra-Low Contact Angle Hysteresis

摘要

Engineered surfaces that repel low-surface-tension liquids, such as various oils and alcohols, have a wide array of applications, including stain-proof apparel, fuel transport, chemical shielding, and self cleaning. Superomniphobic surfaces display apparent contact angles (θ~*) that are greater than 150° and exhibit low contact angle hysteresis (the difference between the advancing and receding contact angles) with essentially all liquids. Previous work has shown how re-entrant curvature is necessary for repelling low-surface-tension liquids. However, it is generally difficult to obtain ultra-low contact angle hysteresis (CAH, Δθ~* < 5°) with such low-surface-tension liquids.