Blue phases (BPs) that appear in a very narrow temperature range between a chiral nematic(N*)and an isotropic liquid phase have three-dimensional periodic structures on the order of visible light wavelengths. On the basis of their specific structure, BP liquid crystals have attracted wide attention as the field of photonics devices. In this study, we synthesized new chiral dopants containing a binaphthyl skeleton as an optical active moiety and two anthracene units as an external stimuli-responsive moiety and investigated how an induced chirality of a host liquid crystal changes by the change in conformation of the chiral dopants upon light and thermal stimuli. When the chiral dopants were added to a nematic host liquid crystal, BP I appeared. As the sample was irradiated with UV light, phase transition from BP I to N* phase was observed. On the other hand, BP I regenerated by heating it. Thus we demonstrated the reversible phase transition between BP I and N* phase by photothermal stimuli.
|Translated title of the contribution||PA46 Synthesis of External Stimuli-Responsive Chiral Dopants Utilizing Anthracene Chemical Reaction to Control Photothermal Phase Transition of Chiral Liquid Crystals|
|Publication status||Published - 2013|