Fig. 2
From: Biomimetic coating-free surfaces for long-term entrapment of air under wetting liquids
Silica surfaces with simple cavities (SCs) immersed in hexadecane. Series of frames obtained by a high-speed camera at 1500 fps during imbibition of hexadecane in SCs of a circular (D = 200 µm), b, c square, and d, e hexagonal geometries of b, d sharp (r = 3 µm) and c, e rounded (r = 50 µm) corners (see Supplementary Movies 1–5). Yellow arrows indicate the direction of the advancing liquid at the onset of immersion. Imbibition was faster in cavities with sharper corners as Sq|3 > Hex|3 > Sq| 50 > Hex|50. (Scale bars: 200 µm)
