Figure 7.

(A) A scheme of the reversible shape transformation between the upright state and the nearly flattened state. (B,C) Scanning electron microscopy images of the mushroom-like pillars in the upright and curved states, respectively. (D,E) Switchable wettability of the surfaces for hexadecane corresponding to (B,C), respectively. (F,G) Reversible variations in the apparent contact angle and sliding angle of hexadecane through repeated bending and recovery processes, respectively. Reprinted with permission from ref. [120]. Copyright 2019 American Chemical Society.