Photonic Multishells Composed of Cholesteric Liquid Crystals Designed by Controlled Phase Separation in Emulsion Drops

Sihun Park; Sang Seok Lee; Shin‐Hyun Kim

doi:10.1002/adma.202002166

journal article Jun 09, 2020

Photonic Multishells Composed of Cholesteric Liquid Crystals Designed by Controlled Phase Separation in Emulsion Drops

Sihun Park Sang Seok Lee Shin‐Hyun Kim

Advanced Materials Vol. 32 No. 30 · Wiley

View at Publisher Save 10.1002/adma.202002166

Abstract

AbstractCholesteric liquid crystals (CLCs), also known as chiral nematic LCs, show a photonic stopband, which is promising for various optical applications. In particular, CLCs confined in microcompartments are useful for sensing, lasing, and optical barcoding at the microscale. The integration of distinct CLCs into single microstructures can provide advanced functionality. In this work, CLC multishells with multiple stopbands are created by liquid–liquid phase separation (LLPS) in a simple yet highly controlled manner. A homogeneous ternary mixture of LC, hydrophilic liquid, and co‐solvent is microfluidically emulsified to form uniform oil‐in‐water drops, which undergo LLPS to form onion‐like drops composed of alternating CLC‐rich and CLC‐depleted layers. The multiplicity is controlled from one to five by adjusting the initial composition of the ternary mixture, which dictates the number of consecutive steps of LLPS. Interestingly, the concentration of the chiral dopant becomes reduced from the outermost to the innermost CLC drop due to uneven partitioning during LLPS, which results in multiple stopbands. Therefore, the photonic multishells show multiple structural colors. In addition, dye‐doped multishells provide band‐edge lasing at two different wavelengths. This new class of photonic multishells will provide new opportunities for advanced optical applications.

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Details

Published: Jun 09, 2020
Vol/Issue: 32(30)
License: View

Authors

S

Sihun Park

Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 South Korea

S

Sang Seok Lee

Functional Composite Materials Research Center Institute of Advanced Composite Materials, KIST Wanju‐gun Jeollabuk‐do 55324 South Korea

S

Shin‐Hyun Kim

Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 South Korea

Funding

Ministry of Science, ICT and Future Planning

National Science Foundation, United Arab Emirates Award: NRF‐2020R1A2C2003245

Korea Institute of Science and Technology

Cite This Article

Sihun Park, Sang Seok Lee, Shin‐Hyun Kim (2020). Photonic Multishells Composed of Cholesteric Liquid Crystals Designed by Controlled Phase Separation in Emulsion Drops. Advanced Materials, 32(30). https://doi.org/10.1002/adma.202002166

Photonic Multishells Composed of Cholesteric Liquid Crystals Designed by Controlled Phase Separation in Emulsion Drops

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