Fig. 6From: Magnetic-Field-Assisted Assembly of Anisotropic Superstructures by Iron Oxide Nanoparticles and Their Enhanced MagnetismSEM images of the assembled structures prepared with polyhedral IONPs. a SEM image of the homogeneous film. b SEM image of the spindle-shaped superstructures, with an inset of close-up SEM image showing the crystalline textureBack to article page