Hybrid aligned cholesteric: A novel liquid‐crystal alignment
Hybrid aligned cholesteric: A novel liquid‐crystal alignment
复制标题
DOI：
10.1063/1.98731
复制
发表时间：
1987-10
影响因子：
4
通讯作者：
M. Lewis;M. Wiltshire
中科院分区：
文献类型：
--
作者：
M. Lewis;M. Wiltshire
报道了一种混合取向双（HAC）液晶（LC）结构。LC指向矢倾斜从一个表面处的小角度变化到另一个表面处的几乎90°，同时结合螺旋扭曲。具有用摩擦的聚乙烯醇处理的一个表面和用有机硅烷十八烷基三乙氧基硅烷处理的另一个表面的电池，当填充有长螺距手性混合物时采用HAC结构。HAC结构的存在下，证实了通过研究的旋光度的变化，首先与厚度的楔形细胞和第二与温度的补偿的混合物。在楔形单元中使用HAC结构的特征在于不存在常规对准所见的间距中断。
A hybrid aligned cholesteric (HAC) liquid‐crystal (LC) structure is reported. The LC director tilt varies from a small angle at one surface to almost 90° at the other, while incorporating a helical twist. Cells having one surface treated with rubbed polyvinyl alcohol and the other with the organosilane octadecyltriethoxysilane, adopt the HAC structure when filled with a long pitch chiral mixture. The presence of the HAC structure was confirmed by studies of the variation of the optical rotation, first with thickness in a wedge cell and second with temperature for a compensated cholesteric mixture. Use of the HAC structure in a wedge cell is characterized by an absence of the pitch breaks seen with conventional alignments.