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Electron microscopy images of magnetic-field-induced self-assembled structures of cubic iron-oxide nanoparticles (G25 in SI Appendix, Table S2) (A) SEM image of a 3D cuboid which consists of more than 10,000 nanocubes. (B) Cryo-SEM image of a nanoparticle solution in toluene. (C) Cryo-TEM image of cubic nanoparticles in toluene showing chains, ribbons, and sheets.
