Fig. 1 Magnetic field–driven assembly of patchy microcubes and their modes of self-reconfiguration. Magnetic field–driven assembly of patchy microcubes.

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Fig. 1 Magnetic field–driven assembly of patchy microcubes and their modes of self-reconfiguration. Magnetic field–driven assembly of patchy microcubes and their modes of self-reconfiguration. (A) Schematic of the experimental setup used to assemble and manipulate the patchy microcubes. A uniform magnetic field was generated by a collinear pair of electromagnets (1 and 2), and a magnetic field gradient was imposed by a single electromagnet (3). (B) Micrograph of an aqueous dispersion of single-side cobalt-coated patchy microcubes (the superimposed yellow lines represent the magnetic patches; scale bar, 20 μm). (C) Example of a linear chain of patchy microcubes formed upon the application of a uniform magnetic field. (D) Reversible self-reconfiguration of the linear chain in (C) into a structure of two closed loops upon removing the applied field (movie S1). (E) Schematics of the assembly pathways for the two basic unit doublets, AA and AB, which correspond to assembled particles on the same side and opposite sides of the assembled magnetic films, respectively. Koohee Han et al. Sci Adv 2017;3:e1701108 Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).