Probing the Consequences of Cubic Particle Shape and Applied Field on Colloidal Crystal Engineering with DNA.

In a magnetic field, cubic Fe O nanoparticles exhibit assembly behavior that is a consequence of a competition between magnetic dipole-dipole and ligand interactions. In most cases, the interactions between short hydrophobic ligands dominate and dictate assembly outcome. To better tune the face-to-face interactions, cubic Fe O nanoparticles were functionalized with DNA.