Journal
SOFT MATTER
Volume 11, Issue 1, Pages 147-153Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4sm01962h
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Funding
- U.S. Department of Energy, Division of Materials Science through the Frederick Seitz Materials Research Laboratory at the University of Illinois at Urbana-Champaign [DE-FG02-07ER46471]
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Monodisperse magnetic colloids are found to self-assemble into unusual crystals in the presence of rotating magnetic fields. First, we confirm a predicted phase transition (S. Jager and S. H. L. Klapp, Soft Matter, 2011, 7, 6606-6616), directly coupled to the dynamic transition of single particle motion, from a disordered state to a hexagonal crystal. Next, going beyond what had been predicted, we report how hydrodynamic coupling produces shear melting, dislocations, and periodically mobile domain boundaries. These uniform magnetic colloids, whose structures are modulated in situ using the protocols described here, demonstrate a strategy of stimulus-response in the colloid domain with potential applications.
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