Figure 3.

(A) Wetting behaviors of various substrates with/without electrosprayed PVDF/CS coatings by placing some 12 μL water droplets (dyed red) on them; (B) wetting behaviors of double-faced superhydrophobic printing paper (coated with the same coatings as (A)) and the uncoated paper, when they are first immersed into the red water and then placed on the cotton; (C) snapshots showing the self-cleaning property of the coated printing paper by slowly dropping water droplets on the surface which has been sprinkled with the chalk powder.