Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 50, Pages 15266-15270Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201507723
Keywords
emulsions; liquid crystals; microcapsules; microfluidics; photonic devices
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Funding
- Korea Research Institute of Chemical Technology (KRICT) through NRF - MEST [KK-1507-C05]
- Midcareer Researcher Program through NRF - MEST [2014R1A2A2A01005813]
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Cholesteric liquid crystals (CLCs) reflect selected wavelengths of light owing to their periodic helical structures. The encapsulation of CLCs leads to photonic devices that can be easily processed and might be used as stand-alone microsensors. However, when CLCs are enclosed by polymeric membranes, they usually lose their planar alignment, leading to a deterioration of the optical performance. A microfluidics approach was employed to integrate an ultrathin alignment layer into microcapsules to separate the CLC core and the elastomeric solid membrane using triple-emulsion drops as the templates. The thinness of the alignment layer provides high lubrication resistance, preserving the layer integrity during elastic deformation of the membrane. The CLCs in the microcapsules can thus maintain their planar alignment, rendering the shape and optical properties highly reconfigurable.
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