Rotating crystals of magnetic Janus colloids

J. Yan, S. C. Bae, S. Granick

Research output: Contribution to journalArticlepeer-review

Abstract

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. Jäger 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.

Original languageEnglish (US)
Pages (from-to)147-153
Number of pages7
JournalSoft Matter
Volume11
Issue number1
DOIs
StatePublished - Jan 7 2015
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics

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