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(A) Schematic illustration of electrospun PCL-azo nanofibers and the produced light-responsive nanofibers switched “on” and “off” by visible and UV light. (B) The diagram of contact angles dependent on different light radiations shows photoresponsive wettability and the good reversibility of PCL-azo nanofibers. The shapes of water droplets on the mats I–III suggest the hydrophilic nature of PCL-azo is dependent on the amount of added azo. (Reprinted from [130])
