A novel photoalignment film for ferroelectric liquid crystal based on self‐assembled monolayer method
A novel photoalignment film for ferroelectric liquid crystal based on self‐assembled monolayer method
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DOI：
10.1080/02678290701817334
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发表时间：
2008-02
期刊：
影响因子：
2.2
通讯作者：
L. Yao;Zeng-hui Peng;Lingli Zhang;Fengzhen Lv;L. Xuan
中科院分区：
文献类型：
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作者：
L. Yao;Zeng-hui Peng;Lingli Zhang;Fengzhen Lv;L. Xuan
提出了一种基于自组装技术的铁电液晶（FLC）配向层光敏材料的设计方法。这一发展为在分子水平上研究和控制FLC与固体表面的相互作用提供了新的工具。由于特殊的化学吸附反应，光反应性材料通过共价键连接自组装到基底上。通过酯键连接，在膜的末端引入一个极性较强的氰基。在线性偏振的紫外光照射下，容易地获得光学各向异性的自组装膜。经辐照的膜被证明导致FLC的均匀排列，通过光学透射率测量和FLC单元在不同旋转角度下的偏振光学显微镜图像。在这种自组装单层膜上的FLC的对准质量与商业摩擦聚酰亚胺膜的对准质量相当。此外，还发现FLC的精细排列可能与自组装膜表面的光滑度有关，这是由于其极性端。
A novel strategy based on self‐assembly technology was devised for design of photosensitive material as a ferroelectric liquid crystal (FLC) alignment layer. This development offers new tools for the study and control at the molecular level of the interaction of FLCs with solid surfaces. The photoreactive material was self‐assembled to the substrate by covalent bond linkage due to a special chemical adsorption reaction. Through ester bond linkage, a cyano group with strong polarity was introduced to be terminus of the film. Under irradiation of linearly polarised ultraviolet light, an optically anisotropic self‐assembled film was easily obtained. The irradiated film was demonstrated to result in homogenous alignment of FLC by optical transmittance measurements and polarising optical microscopy images of a FLC cell at different rotation angles. The alignment quality of the FLC on this self‐assembled monolayer film is comparable to that of commercial rubbed polyimide film. Furthermore, it was also found that the fine alignment of the FLC may be related to the smoothness of the self‐assembled film surface owing to its polar end.