Chiral lyotropic chromonic liquid crystals composed of disodium cromoglycate doped with water-soluble chiral additives?
Soft Matter Pub Date: 2018-02-05 DOI: 10.1039/C7SM02262J
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.
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Journal Name：Soft Matter
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CAS no.: 89640-58-4
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