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(a) Schematic and photo of ZnO/TiO2 ciliated films (a bent specimen is shown in the inset). The photo on the right shows the bending of ZnO/TiO2 cilia under the action of an external magnetic field [155]. (b) Schematic representation of a neon tetra fish and SEM photo of the artificial photonic structure fabricated in [156]. Copyright 2012, American Chemical Society.
