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Chiral lyotropic chromonic liquid crystals composed of disodium cromoglycate doped with water-soluble chiral additives

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Abstract

We investigated the pitches of cholesteric liquid crystals prepared by mixing disodium cromoglycate (DSCG) in water with 5 different water-soluble chiral additives. The measurements are based on the Grandjean–Cano wedge cell method. Overall, the twisting effect is weak, and the shortest pitch of 2.9 ± 0.2 μm is obtained using trans-4-hydroxy-L-proline, by which the cholesteric sample is iridescent at certain viewing angles. Freeze-fracture transmission electron microscopy (FFTEM) was also performed for the first time on both the nematic and cholesteric phases, revealing that stacked chromonic aggregates are very long, up to a few hundred nm, which explains why cholesteric chromonic liquid crystals hardly have pitches in the visible wavelength region.

Graphical abstract: Chiral lyotropic chromonic liquid crystals composed of disodium cromoglycate doped with water-soluble chiral additives

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Publication details

The article was received on 17 Nov 2017, accepted on 02 Feb 2018 and first published on 05 Feb 2018


Article type: Communication
DOI: 10.1039/C7SM02262J
Citation: Soft Matter, 2018, Advance Article
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    Chiral lyotropic chromonic liquid crystals composed of disodium cromoglycate doped with water-soluble chiral additives

    T. Shirai, M. Shuai, K. Nakamura, A. Yamaguchi, Y. Naka, T. Sasaki, N. A. Clark and K. V. Le, Soft Matter, 2018, Advance Article , DOI: 10.1039/C7SM02262J

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