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We have designed a facile and effective strategy for producing nanostructures onthree-dimensional curved polymer surfaces The poly(N-vinylpyrrolidone)(PVP)-stabilized polystyrene colloid latex dispersed in ethanol was exposed to anonsolvent medium of PVP and nanometric dioplets rapidly formed on thethree-dimensional curved polymer surfaces The surface wettability of the polymercolloids with nanoprotrusions experienced a significant change due to the increase inthe degree of surface roughness.The formation mechanism was ascribed to theprecipitation of PVP phase due to the nonsolvent induced phase separation. To furtherconfirm the proposed mechanism, the material components included in the polymercolloid latices before the nanostructuration process and surface compositions on thenanostructured curved polymer surfaces were characterized using gel permeationchromatography (GPC) and time-of-flight secondary ion mass spectrometry(TOF-SIMS) respectively. Furthermore, the morphology evolution kinetics of thenanostructured three-dimensional curved polymer surfaces was also examined beforethe complete evaporation of the nons.olvent. This new strategy provides an alternativeand promising method for generation of hierarchical polymer micro/nanostructures.