Control for orientation of liquid crystal molecular LB film and measurement for molecular orientation

1. 利用本研究经费改进的Langmuir Blodgett （LB）薄膜制备装置，控制了液晶分子的表面密度和无水合成石英衬底和CaF_2衬底的上拉方向。利用该装置制备了LC LB薄膜作为实验样品。为了研究LC分子的微观局部场效应以及LC分子与摩擦聚苯乙烯（PS）膜之间的局部场效应对LC LB膜分子取向的贡献，测量了样品旋转角与二次谐波强度的关系，并将其作为基光偏振角的函数。考虑微观局部场效应和LC LB膜的拉升方向，分析了摩擦PS膜的分子取向和LC LB膜吸附在PS膜上的分子取向的各向异性。当表面密度3×10^<14>分子/cm^2的LC LB膜以平行和垂直于摩擦方向向上拉时，可以理解LC分子的分子取向方向发生了变化。将LC LB膜沿平行方向和垂直方向向上拉。平行拉起的LC LB膜与摩擦方向垂直。而垂直向上拉起的LC LB膜则朝向与摩擦方向平行的方向。结果表明，利用LB法制备LB膜时，通过控制拉升方向，可以实现对LB膜分子取向的控制。采用上述LC LB薄膜对液晶电池的分子取向进行评价，观察偏光显微镜图像，测量偏振光红外吸收光谱，并将其与LC电池的两种红外线颜色进行比较。制作了LC LB膜未吸附的LC电池，并对其进行了比较。结果表明，LC LB膜中分子取向的强各向异性被LC体所缓解，与LC细胞的取向几乎相等。少

1. Evaluation for molecular orientation of liquid crystal molecular LB filmThe surface density of a liquid crystal (LC) molecule and the direction of pulling up of the anhydrous synthetic quartz substrate and the CaF_2 substrate were controlled using the making device of Langmuir Blodgett (LB) film improved by using this research expenditure. Using the device, LC LB films were made as experimental samples. To examine the contribution of the microscopic local field effect of LC molecules and between LC molecules and rubbed polystyrene (PS) film to the molecular orientation of the LC LB film, the sample rotation angle dependency of second harmonic intensity was measured as a function of the polarization angle of fundamental light. Anisotropy of the molecular orientation of the rubbed PS film and of the molecular orientation of the LC LB film adsorbed on the PS film were analyzed with consideration of the microscopic local field effect and of the pulling up direction of the LC LB film. Th … More e LC LB film at surface density 3×10^<14> molecule/cm^2 pulled up with parallel and perpendicular to rubbing direction, it had been understood that the direction of the molecular orientation of LC molecules had changed. The LC LB film was pulled up in parallel and perpendicular to the rubbing direction, respectively. The LC LB film pulled up parallel was oriented to perpendicular direction against the rubbing direction. However, the LC LB film pulled up perpendicular was oriented to parallel direction against the rubbing direction. It was suggested that the control for the molecular orientation of the LC LB film become possible because it controlled the direction of pulling up when LC LB film was made using LB method.2. Evaluation for molecular orientation of liquid crystal cellLC cells were made by using LC LB films as stated above, the polarizing microscope image was observed, the polarized light infrared absorption spectrum was measured, and it decided it compared with two infrared rays colors of the LC cell. The LC cell that the LC LB film had not adsorbed either made and it compared it. As a result, it was concluded strong anisotropy for the molecular orientation seen in the LC LB film was seen to be eased by the LC bulk, and it was almost equal for the orientation as the LC cell. Less