Photonic Microcapsules Containing Single-Crystal Colloidal Arrays with Optical Anisotropy

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Colloidal particles with a repulsive interparticle potential spontaneously form crystalline lattices, which are used as a motif for photonic materials. It is difficult to predict the crystal arrangement in spherical volume as lattices are incompatible with a spherical surface. Here, the optimum arrangement of charged colloids is experimentally investigated by encapsulating them in double-emulsion drops. Under conditions of strong interparticle repulsion, the colloidal crystal rapidly grows from the surface toward the center of the microcapsule, forming an onion-like arrangement. By contrast, for weak repulsion, crystallites slowly grow and fuse through rearrangement to form a single-crystal phase. Single-crystal structure is energetically favorable even for strong repulsion. Nevertheless, a high energy barrier to colloidal rearrangement kinetically arrests the onion-like structure formed by heterogeneous nucleation. Unlike the isotropic onion-shaped product, the anisotropic single-crystal-containing microcapsules selectively display-at certain orientations but not others-one of the distinct colors from the various crystal planes.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2019-05
Language
English
Article Type
Article
Citation

ADVANCED MATERIALS, v.31, no.18

ISSN
0935-9648
DOI
10.1002/adma.201900693
URI
http://hdl.handle.net/10203/262725
Appears in Collection
CBE-Journal Papers(저널논문)
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