SEM images of smart SOP commercial cotton fabric (A) and (B) polyester fabric. (C) Smart fabric with nonpolar alkanes beading
up (dyed red, from left to right, hexadecane, decane and hexane, respectively) and polar liquids permeating through (from left to
right, dimethylformamide DMF red, ethanol orange and water blue, respectively). (D, E) Apparent contact angles for liquids with
different polarity on the smart fabric surface shown in (A). Insets in (D, E) demonstrate the counterintuitive wettability for polar
and nonpolar liquids. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.]