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首页> 外文期刊>The European physical journal, E. Soft matter >Frustrated structure of an anticlinic-like smectic-C phase
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Frustrated structure of an anticlinic-like smectic-C phase

机译：类抗临床近晶C相的受阻结构

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摘要

We present a polarising optical microscopy study of the low-temperature anticlinic-like tilted mesophase of the liquid-crystal compound octylphenyl-2-chloro-4-(p-cyano-benzoyloxy) (DB8Cl). This mesophase has been described as a bilayer smectic structure in which the molecules within each layer are organised in an anticlinic way. The optical textures observed in samples with planar orientation show a double stripe pattern, with the lines aligned parallel to the rubbing direction, characteristic of a double periodic modulation of the refractive index of the material. The long-period modulation is temperature dependent and disappears for thin sample cells (< 5 mu m). The short-period modulation is nearly independent of the thickness of the cells. The experimental results are analysed in terms of a model which considers that there is a special distribution of the principal optical axis which may be in or out of the polariser-analyser plane. The observed periodic variation of the principal optical axis could not be interpreted in terms of the original structure proposed for this phase. DB8Cl presents a structure formed by dimers that can be viewed as flexible bent-core-like molecules, showing similarities with phases found in banana-like systems, but exhibiting a much more complex structure.
机译：我们目前对液晶化合物辛基苯基-2-氯-4-（对氰基-苯甲酰氧基）（DB8Cl）的低温类抗倾斜样倾斜中间相进行了偏光光学显微镜研究。该中间相已被描述为双层近晶结构，其中每一层内的分子以抗临床方式组织。在具有平面取向的样品中观察到的光学纹理显示出双条纹图案，其线平行于摩擦方向排列，具有材料折射率的双重周期性调制的特征。长期调制取决于温度，对于薄样品池（<5微米）消失。短周期调制几乎与单元的厚度无关。根据模型分析实验结果，该模型认为主光轴存在特殊分布，该分布可能在偏振器-分析器平面之内或之外。观察到的主光轴的周期性变化无法根据为此阶段提出的原始结构来解释。 DB8C1呈现由二聚体形成的结构，其可被视为柔性的弯曲核状分子，显示出与在香蕉状系统中发现的相相似，但显示出更为复杂的结构。

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