Fig. S11.

Local contact angle measurement by the sessile microdrop method illustrating local wettability contrast. Water microdroplets are precisely delivered to the uniformly coated hydrophobic region (A); the uncoated hydrophilic region (B); and the oxygen-plasma treated hydrophilic region (C). The exact location and the relative size of microdrops to the crease pattern size are revealed from the top view optical micrographs presented in the Bottom Row. The advancing contact angle is measured by dynamically incrementing water volume (Top Row), whereas the receding contact angle is measured when the contact line depins as the water microdrops evaporate (Middle Row). The advancing contact angle and receding contact angle are measured to be 127 ± 2° and 114 ± 1° for A; 87 ± 1° and ∼35° for B; and 76 ± 2° and ∼20° for C, respectively.