Fig. 7From: Magnetic-Field-Assisted Assembly of Anisotropic Superstructures by Iron Oxide Nanoparticles and Their Enhanced MagnetismM-H curves of the assembled structures at 300 K. a Rod-shaped superstructures of spherical IONPs assembled under a magnetic field. b Uniform films of spherical IONPs assembled without a magnetic field. c Spindle-shaped superstructures of polyhedral IONPs assembled under a magnetic field. d Uniform films of polyhedral IONPs assembled without a magnetic field. Insets show the enlarged curvesBack to article page