Synthesis of sub-100 nm biocompatible superparamagnetic Fe 3 O 4 colloidal nanocrystal clusters as contrast agents for magnetic resonance imaging

Sub-100 nm Fe 3 O 4 particles have been synthesized via a solvothermal method by using water as a size-control agent. They show superparamagnetism, high magnetization, prominent biocompatibility, and great promising for magnetic resonance imaging.