Fig. 5

Phase diagram of wetting states of the water droplet on pillar-patterned surfaces. In each panel, square dots represent experimental results and the black line delineates the W-CB boundary. Pillar spacing d _p = 300 nm, experimental results from Ref. 13 (a); d _p = 2 nm, experimental results from Ref. 38 (b); d _p = 5 nm, experimental results from Ref. 38 (c); d _p = 250 nm, experimental results from Ref. 37 (d)