Understanding basic nature, investigation of new phases and applications to device materials of frustrated liquid crystals

本项目研究了一种同时扩展场致布拉格衍射位移波长范围和热稳定bp温度范围的新方法。提出了一种利用树突分子同时扩展两蓝相范围的新型液晶蓝材料体系。一个是热力学稳定的蓝色相的温度范围。二是布拉格波长在电场上的可逆最大位移范围。从液晶分子的弹性性质和取向顺序等方面讨论了蓝相中树突稳定效应的物理机制。用激光共聚焦扫描光学显微镜研究了蓝相和聚合物稳定蓝相的晶格结构。

A new approach to simultaneously extend the wavelength range of field-induced Bragg diffraction shift and the temperature range of thermodynamically stable BPs has been studied in this project. A new liquid crystal blue material system was shown using a dendron molecule to extend simultaneously the two blue phase ranges. One is the temperature range of thermodynamically stable blue phases. The other is the reversible maximum shift range of Bragg wavelength on the electric field. The physical mechanism of the dendron-stabilizing effect in blue phases is discussed in terms of elastic property and orientational order of liquid crystal molecules. The lattice structure of the blue phases and polymer-stabilized blue phases were closely investigated using confocal laser scanning optical microscope.