Self assemby of FeO Nanocubes

Shape Induced Symmetry in Self-Assembled Mesocrystals of Iron Oxide Nanocubes.
Sabrina Disch, Erik Wetterskog, Raphael P. Hermann, German Salazar-Alvarez, Peter Busch, Thomas Brückel, Lennart Bergström, and Saeed Kamali
Nano Lett. 11, 1651 (2011)

Grazing incidence small-angle scattering and electron microscopy have been used to show for the first time that nonspherical nanoparticles can assemble into highly ordered body-centered tetragonal mesocrystals.