| 초록 |
A programmed remote-controllable chiral liquid crystal containing four azobenzene moieties covalently connected to a chiral core (abbreviated as AZ4ID) is designed and precisely synthesized for the optically tunable thin films. Thermal, microscopic, and scattering techniques are used to examine the ordered arrangements and phase transition of AZ4ID systematically. Based on Wide-angle X-ray diffractions, oriented AZ4ID sample forms two characteristic layer structures (SmA* and SmCr). By doping AZ4ID into the achiral nematic molecules, the helical superstructures of chiral nematic LC phase (N*) and blue phase (BP) are spontaneously constructed. Remote-controllable phase transformations in the SmA*, N*, and BP are demonstrated by change the wavelength of light. Photoinduced phase transformations in the AZ4ID LC films can be applied as remote-controllable optical devices. This work was supported by the BK21 Plus, the BRL 2015042417, and Mid-Career Researcher Program (2016R1A2B2011041). |
