Self-Assembly and Self-Orientation of Truncated Octahedral Magnetite Nanocrystals


  • This work was supported by grants from the Research Grants Council and the EHIA award of University Grants Council of the Hong Kong SAR, China.


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Monodisperse magnetite nanoparticles (12 nm) in the shape of Wigner–Seitz crystals self-assemble into a body-centered cubic superlattice (see figure) in which the nanoparticles possess the same crystallographic orientations. Shape plays a critical role in controlling the orientation of the nanoparticles in self-assembly. Both self-assembly and self-orientation of nanoparticles are important for technical applications such as high-density magnetic storage.