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Author

Bae, Sung Chul
Multiscale Optical Imaging Lab
Research Interests
  • Multiscale optical imaging, laser spectroscopy, laser microscopy, laser sensing, soft matter physics, surface and interfacial science, laser Matter Interaction

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Colloidal ribbons and rings from Janus magnetic rods

Cited 22 times inthomson ciCited 11 times inthomson ci
Title
Colloidal ribbons and rings from Janus magnetic rods
Author
Yan, JingChaudhary, KundanBae, Sung ChulLewis, Jennifer A.Granick, Steve
Keywords
MAGNETOTACTIC BACTERIA; COMPLEX STRUCTURES; DIPOLAR; PHASE; NANOPARTICLES; MICROSPHERES; MAGNETOSOMES; AGGREGATION; FERROFLUIDS; PARTICLES
Issue Date
201302
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v.4, no., pp. -
Abstract
Dipolar particles are fundamental building blocks in nature and technology, yet the effect of particle anisotropy is seldom explored. Here, we fabricate colloidal silica rods coated with a hemicylindrical magnetic layer to satisfy multiple criteria: nearly monodisperse, easily imaged and magnetic interaction that dominates over gravity. We confirm long-predicted features of dipolar assembly and stress the microstructural variety brought about by shape and constituent anisotropy, especially by extrapolating knowledge learned from literal molecules. In this colloidal system, we describe analogies to liquid crystalline deformations with bend, splay and twist; an analogy to cis/trans isomerism in organic molecules, which in our system can be controllably and reversibly switched; and a field-switching methodology to direct single ribbons into not only single but also multiple rings that can subsequently undergo hierarchical self-assembly. We highlight subtle material issues of control and design rules for reconfigurable dipolar materials with building blocks of complex shape.
URI
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DOI
http://dx.doi.org/10.1038/ncomms2520
ISSN
2041-1723
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