Effective Debye relaxation models for binary solutions of polar liquids at terahertz frequencies.
Effective Debye relaxation models for binary solutions of polar liquids at terahertz frequencies.
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DOI：
10.1039/d0cp06707e
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发表时间：
2021-02-25
期刊：
影响因子：
--
通讯作者：
Arbab MH
中科院分区：
文献类型：
--
作者：
Zhou JW;Arbab MH
有许多有效的介质模型可以准确地描述混合物的介电性质。然而，这些模型假定组件是非交互的。这种假设不适用于极性液体的溶液，导致混合物的测量和理论预测的复折射率之间存在显著偏差。我们提出了三种有效的介质理论，扩展了著名的德拜弛豫模型，用于太赫兹（THz）区域的极性液体溶液。本文提出的新有效介质模型基于每种混合物的协同运动动力学和自关联特性来预测个体弛豫德拜参数，从而解释了溶液的介电函数与传统有效介质模型的偏差。通过太赫兹时域光谱（THz- tds）对四种乙醇-水溶液的反射测量验证了这些模型。与现有的混合介质模型相比，新的有效Debye定理更准确地预测了极性溶液的介电性质，并有可能解释种间混合方案和相互作用。
There are many effective media models that accurately describe the dielectric properties of mixtures. However, these models assume that the components are non-interacting. This assumption is not valid for solutions of polar liquids, resulting in significant deviations between the measured and theoretically predicted complex index of refraction of the mixtures. We present three effective media theories by expanding the well-known Debye relaxation model for solutions of polar liquids in the terahertz (THz) regime. The new effective media models proposed in this paper predict the individual relaxation Debye parameters based on the cooperative motion dynamics and self-associative properties of each mixture, and therefore explain the deviation of the dielectric functions of the solutions from the traditional effective media models. These models are verified through reflection measurements of four alcohol-water solutions acquired through THz time-domain spectroscopy (THz-TDS). Compared to the current mixed media models, the new effective Debye theorem predicts the dielectric properties of polar solutions more accurately, and has the potential to explain inter-species mixing schemes and interactions.
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