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Temperature-dependent dielectric dynamics, relaxation, and conductivity behavior of aqueous and nonaqueous lyotropic liquid crystalline phases
Soft Materials ( IF 1.2 ) Pub Date : 2020-01-21 , DOI: 10.1080/1539445x.2020.1714655
Ravi K. Shukla 1 , K.K. Raina 1
Affiliation  

ABSTRACT

Lyotropic phases are derived from cetyl pyridinium chloride and sodium dodecyl sulfate surfactants via dissolving them in water and glycerol. A significant increase in the dielectric permittivity of lyotropic mixtures has been observed as a function of increasing temperature in all lyotropic phases irrespective of surfactant nature. A single relaxation peak corresponding to the Cole-Cole relaxation process has been observed for all the studied mixtures. Non-Arrhenius variation of the relaxation frequency seen for these lyotropic mixtures represents the Vogel-Fulcher-Tammann (VFT) behavior. An increase in dc conductivity is observed as a function of temperature, which becomes more prominent at a higher temperature > 50°C. Highest dc conductivity of the order of 10−4 S/m noticed for these systems is one of the key findings of this study. Optical studies confirm that aqueous and nonaqueous lyotropic mixtures exhibit a wide optical bandgap ranging from 4.0 to 4.5 eV.



中文翻译:

水和非水溶致液晶相的温度相关介电动力学,弛豫和电导行为

摘要

溶致相通过将它们溶解在水和甘油中而衍生自十六烷基氯化吡啶鎓和十二烷基硫酸钠表面活性剂。已观察到,与表面活性剂的性质无关,在所有溶致相中,随着温度升高,溶致混合物的介电常数显着增加。对于所有研究的混合物,已经观察到对应于Cole-Cole弛豫过程的单个弛豫峰。这些溶致混合物的弛豫频率的非阿累尼乌斯变化代表了Vogel-Fulcher-Tammann(VFT)行为。观察到直流电导率随温度的增加而增加,在高于50°C的较高温度下,这一点变得尤为突出。最高直流电导率约为10 -4 这些系统注意到的S / m是这项研究的主要发现之一。光学研究证实,水溶致溶混合物和非水溶致溶混合物具有较宽的光学带隙,范围为4.0至4.5 eV。

更新日期:2020-01-21
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