Superparamagnetic Magnetite Colloidal Nanocrystal Clusters


  • Y.Y. thanks the University of California, Riverside for startup funds. We thank Dr. J. Guo and Dr. C. Dong at the Lawrence Berkeley National Laboratory for help with the XAS analyses, and Dr. K. N. Bozhilov and Mr. S. McDaniel at the Central Facility for Advanced Microscopy and Microanalysis at UCR for assistance with the TEM measurements.


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High-temperature hydrolysis of FeCl3 in the presence of a surfactant gives monodisperse superparamagnetic colloidal nanocrystal clusters (CNCs) of magnetite with tunable sizes (30–180 nm; see scheme). The combination of superparamagnetism, high magnetization, and high water dispersibility makes these CNCs ideal candidates for applications such as drug delivery and bioseparation.