| 초록 |
Cholesteric liquid crystals confined in 3D emulsions are useful in various sensing scenarios in microscale due to their optical properties determined by helical pitch. In this study, liquid crystal (LC) droplets with multiple photonic stopbands are created by the mixtures of cholesteryl oleyl carbonate (COC) and cyanobiphenyl (CB) with different alkyl chain lengths. The use of poly(vinyl alcohol) provides a planar anchoring condition yielding radial disposition of helical axis. The reciprocal pitch exhibits unique function of cyanobiphenyl concentration, suggesting integration of CB monomers and dimers between COC molecules. Moreover, alkyl chain length of CB from 4 to 8 results in the shift of cholesteric to smectic transition. Finally, dynamic photonic behavior is tested by repeated heating-cooling cycles, suggesting our LC emulsions are soft materials that will find utility in a variety of colorful applications. |
