| 초록 |
A programed remote-controllable chiral liquid crystal containing four azobenzene moieties covalently connected to a chiral core (abbreviated as AZ4IC) is newly designed and precisely synthesized for the optically tunable thin films. Thermal, microscopic, and scattering are used to examine the phase evolution and ordered arrangements of AZ4IC systematically. Based on Wide-angle X-ray diffractions, oriented AZ4IC sample forms two characteristic layer structures (SmA* and SmCr). By doping AZ4IC 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 AZ4IC 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). |
