首页> 外文会议>Liquid Crystals and Applications in Optics; Proceedings of SPIE-The International Society for Optical Engineering; vol.6587 >Dynamic behaviour of a ferroelectric liquid crystal by means of Nuclear Magnetic Resonance and Dielectric Spectroscopy
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Dynamic behaviour of a ferroelectric liquid crystal by means of Nuclear Magnetic Resonance and Dielectric Spectroscopy

机译:核磁共振和介电谱法研究铁电液晶的动态行为

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摘要

The field of ferroelectric liquid crystals (FLCs) is one of the most fascinating aspects of the Science of Materials for their interesting electro-optic applications. Among different chemical and physical properties those related to the molecular dynamics are very stimulating due to the relationship between molecular motions and macroscopic response to external fields, such as electric and magnetic ones. In this work, the molecular dynamics of a ferroelectric smectogen, namely the(S)-2-methylbutyl-[4'-(4"-heptyloxyphenyl)-benzoyl-4-oxy-(S)-2-((S)-2')-benzoyl)-propionyl)]-propionate(ZLL 7/~*) has been investigated by means of ~2H NMR and dielectric relaxation techniques. The first method allows us to get information on the molecular motions in the fast motion regime, in particular the diffusion reorientational motions of the whole molecule, as well as of the internal motions affecting the phenyl and biphenyl fragments. The second technique, which covers the slow motion regime, has been used to detect collective motions and fluctuation modes. This study allows us to have a complete idea of molecular motions in the different smectic phases formed by the ZLL 7/~* mesogens, in particular the paraelectric smectic A (SmA), the ferroelectric smectic C~* (SmC~*), the antiferroelectric smectic C_A~* (SmC_A~*) and the re-entrant ferroelectric smectic C~* (SmC_r~*) phases. This last phase has been investigated for the first time in this work, from the point of view of the dynamic behaviour. All results will be discussed in the framework of the molecular dynamics of ferroelectric liquid crystals, reported in the literature so far.
机译:由于其有趣的电光应用,铁电液晶(FLC)领域是《材料科学》最引人入胜的方面之一。在不同的化学和物理特性中,与分子动力学相关的特性非常受刺激,这是由于分子运动与宏观对外部电场(例如电场和磁场)的响应之间的关系。在这项工作中,铁电表面活性剂,即(S)-2-甲基丁基-[4'-(4“-庚氧基苯基)-苯甲酰基-4-氧基-(S)-2-((S)-已通过〜2H NMR和介电弛豫技术研究了2')-苯甲酰基)-丙酰基)]丙酸酯(ZLL 7 /〜*),第一种方法使我们能够获得有关快运动状态下分子运动的信息尤其是整个分子的扩散重新定向运动,以及影响苯基和联苯片段的内部运动,第二种涵盖慢动作方案的技术已被用于检测集体运动和波动模式。让我们对由ZLL 7 /〜*介晶形成的不同近晶相中的分子运动有一个完整的了解,尤其是顺电近晶A(SmA),铁电近晶C〜*(SmC〜*),反铁电近晶C_A〜*(SmC_A〜*)和折返铁电近晶C〜*(SmC_r〜*)相。从动态行为的角度对这项工作进行了首次调查。到目前为止,已有文献报道了所有结果将在铁电液晶分子动力学的框架内进行讨论。

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