Superparamagnetic Magnetite Colloidal Nanocrystal Clusters

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. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2007/z700197_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be…