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首页> 外文期刊>Japanese journal of applied physics >Helical Structure In Antiferroelectric Liquid Crystals
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Helical Structure In Antiferroelectric Liquid Crystals

机译：反铁电液晶中的螺旋结构

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摘要

The helical structure in an antiferroelectric liquid crystal (AFLC) phase may show a complicated temperature dependence such as the change in the helical handedness. However, the mechanism of the helical arrangement of molecules has not been clarified. In this study, we investigated the temperature dependence of the helical structure using several types of AFLC material and the effect of the optical purity on the helical structure in terms of optical rotatory power (ORP) and circular dichroism (CD). Results show that the increase in the helical pitch, which originates from a decline of the optical purity, is not due to the decrease in the macroscopic twisting power but the microscopic coexistence of both the helical handedness. Furthermore, it is clear that the change in the helical handedness is a premonitory phenomenon of the phase transition from the antiferroelectric smectic C (SmC_a~*) to the lower temperature phase such as the crystal phase. On the other hand, it is confirmed that the change in the helical handedness is not intrinsic to all AFLC media.
机译：反铁电液晶（AFLC）相中的螺旋结构可能显示出复杂的温度依赖性，例如螺旋性的变化。但是，分子的螺旋排列的机理尚未阐明。在这项研究中，我们研究了使用几种类型的AFLC材料的螺旋结构的温度依赖性，以及光学纯度对螺旋结构的光学旋转力（ORP）和圆二色性（CD）的影响。结果表明，由于光学纯度的下降而引起的螺距的增加不是由于宏观扭曲力的降低，而是两种螺旋惯性的微观共存。此外，显然，螺旋惯性的变化是从反铁电近晶C（SmC_a〜*）到较低温度相例如结晶相的相变的先兆现象。另一方面，已经证实，螺旋性的变化并不是所有AFLC介质都固有的。

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