Fig. 2From: Magnetic-Field-Assisted Assembly of Anisotropic Superstructures by Iron Oxide Nanoparticles and Their Enhanced MagnetismCharacterization of the synthesized nanoparticles. a TEM image of spherical IONPs. b TEM image of polyhedral IONPs. Inserts show the HRTEM images. c SAED pattern of spherical IONPs. d SAED pattern of polyhedral IONPsBack to article page