Matsumori Masaki, Takahashi Ayami, Tomioka Yasushi, Hikima Takaaki, Takata Masaki, Kajitani Takashi, Fukushima Takanori
†Hitachi Research Laboratory, Hitachi, Ltd., 7-1-1 Omika, Hitachi, Ibaraki 319-1292, Japan.
‡Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
ACS Appl Mater Interfaces. 2015 Jun 3;7(21):11074-8. doi: 10.1021/acsami.5b02577. Epub 2015 May 20.
Single-layer thin alignment films of dye molecules are of growing importance, particularly for state-of-the-art LCD technology. Here we show that a sequential process involving the photoalignment and humidification of a chromonic liquid crystalline azobenzene (brilliant yellow; BY) dispersed in a triacetyl cellulose (TAC) matrix gives a thin alignment film with an exceptionally high order parameter (0.81). Spectroscopic and X-ray diffraction analyses of a BY/TAC composite film in each alignment process revealed that brief humidification triggers restructuring of the BY assembly from 1D nematic-like order to anisotropic 2D columnar order, resulting in the dramatic increase in the order parameter.
染料分子的单层薄取向膜越来越重要，特别是对于最先进的液晶显示器技术。在这里，我们表明，一个涉及光取向和对分散在三乙酰纤维素（TAC）基质中的发色团液晶偶氮苯（亮黄；BY）进行加湿的顺序过程，能够得到具有异常高序参数（0.81）的薄取向膜。在每个取向过程中对BY/TAC复合膜进行的光谱和X射线衍射分析表明，短暂的加湿会触发BY组装体从一维向列型有序结构转变为各向异性的二维柱状有序结构，从而导致序参数急剧增加。
