Fig. 11From: One Step In Situ Loading of CuS Nanoflowers on Anatase TiO2/Polyvinylidene Fluoride Fibers and Their Enhanced Photocatalytic and Self-Cleaning PerformanceThe optical photograph of a water drop rolling on the surface of Cu 1 to remove dust: a clean sample, b sample with dusty surface, c drop droplets on dust-covered samples, and d the droplets roll away the dust and expose the clean surface of the sampleBack to article page