Influence of morphology and surface exchange reaction on magnetic properties of monodisperse magnetite nanoparticles

► Magnetic Fe3O4 NPs with different shape but the same size and surface were obtained. ► Samples were monodisperse which hardly changed using longer ligand exchange time. ► Magnetism was compared based on different morphology and ligand exchange time. ► Sample surfaces were destroyed during ligand exchange, leaving magnetism weakened. ► Quasi-cubical sample had better magnetism than spherical one under comparable condition