Application of infrared ATR spectroscopy to liquid crystals. I. Surface-induced orientation in thin films of nematic MBBA.
Application of infrared ATR spectroscopy to liquid crystals. I. Surface-induced orientation in thin films of nematic MBBA.
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红外ATR光谱在液晶中的应用。
DOI：
10.1246/bcsj.50.2522
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发表时间：
1977
期刊：
影响因子：
--
通讯作者：
A. Hatta
中科院分区：
文献类型：
--
作者：
A. Hatta
用传统的透射法和ATR法测量了向列型液体N-(对甲氧基亚甲基)-对丁基苯胺(MBBA)的红外二色性。前者采用KbR窗口作为衬底。通过摩擦获得的均匀结构的取向有序度为S=0.40。利用测得的二向色性比，计算了分子的过渡矩与分子长轴之间的夹角。计算值与已提出的分子构象符合得很好。在ATR方法中，使用了镀In_2O_3的玻璃板作为衬底。摩擦后的In_2O_3表面取向均匀，S系数为0.57。经二甲基二氯硅烷处理的In_2O_3表面呈现同向异性织构，S值为0.53。相对于分子长轴的跃迁力矩的方向与由透射谱得到的结果非常一致。
Infrared dichroism of nematic liquid N-(p-methoxybenzylidene)-p-butylaniline (MBBA) was measured using a conventional transmission method and an ATR method. In the former, KBr windows were used as substrates. The degree of orientation order of the homogeneous structure, which was achieved by a rubbing procedure, was obtained to be S=0.40. Using the measured dichroic ratios, the angles between the transition moments and the long axis of the molecule were calculated. The calculated values are in satisfactory agreement with the molecular conformation already suggested. In the ATR method, In2O3-coated glass plates were used as substrates. Rubbing of the In2O3 surface gave a uniform homogeneous orientation with an S value of 0.57. An In2O3 surface treated with dimethyldichlorosilane gave a homeotropic texture with an S value of 0.53. The directions of the transition moments relative to the long axis of the molecule closely agreed with those obtained from transmission spectra.