Figure 1

Schematic outlining the procedure for synthesizing the wettability-patterned coatings.

(a) The procedure begins with a micro-textured SiC substrate; (b) a PMC-HFS composite film is dropcast onto the SiC substrate forming a superhydrophobic surface (after drying); (c) hydrophilic inkjet patterns are successively applied until the desired level of hydrophilicity is achieved. r_i and r_o represent the inner and outer radii of the hydrophilic ring patterns, respectively. w_i and w_o represent the radial widths of the hydrophilic inner and outer rings, respectively. Arcs can be generated by eliminating the inner ring and setting the central angle (2γ) to be 2γ < 2π (in (c) 2γ = π).