Rotating crystals of magnetic Janus colloids | Zendy

Jing Yan | Zendy; Sung Chul Bae | Zendy; Steve Granick | Zendy

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Rotating crystals of magnetic Janus colloids

Author(s) -

Jing Yan,

Sung Chul Bae,

Steve Granick

Publication year - 2014

Publication title -

soft matter

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.99

H-Index - 170

eISSN - 1744-6848

pISSN - 1744-683X

DOI - 10.1039/c4sm01962h

Subject(s) - colloid , condensed matter physics , phase transition , materials science , soft matter , janus particles , colloidal crystal , chemical physics , dispersity , janus , magnetic domain , nanotechnology , magnetic field , chemistry , physics , magnetization , quantum mechanics , polymer chemistry

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.

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