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Long-Range Static and Dynamic Previtreous Effects in Supercooled Squalene—Impact of Strong Electric Field
Molecules ( IF 4.6 ) Pub Date : 2021-09-25 , DOI: 10.3390/molecules26195811
Szymon Starzonek 1 , Aleksandra Drozd-Rzoska 1 , Sylwester J Rzoska 1
Affiliation  

This article presents evidence for the long-range previtreous changes of two static properties: the dielectric constant (ε) and its strong electric field related counterpart, the nonlinear dielectric effect (NDE). Important evidence is provided for the functional characterizations of ε(T) temperature changes by the ‘Mossotti Catastrophe’ formula, as well as for the NDE vs. T evolution by the relations resembling those developed for critical liquids. The analysis of the dynamic properties, based on the activation energy index, excluded the Vogel–Fulcher–Tammann (VFT) relation as a validated tool for portraying the evolution of the primary relaxation time. This result questions the commonly applied ‘Stickel operator’ routine as the most reliable tool for determining the dynamic crossover temperature. In particular, the strong electric field radically affects the distribution of the relaxation times, the form of the evolution of the primary relaxation time, and the fragility. The results obtained in this paper support the concept of a possible semi-continuous phase transition hidden below Tg. The studies were carried out in supercooled squalene, a material with an extremely low electric conductivity, a strongly elongated molecule, and which is vitally important for biology and medicine related issues.

中文翻译:

过冷角鲨烯的远距离静态和动态前玻璃体效应——强电场的影响

本文提供了两种静态特性的长期玻璃体前变化的证据:介电常数 ( ε ) 及其与强电场相关的对应物,非线性介电效应 (NDE)。'Mossotti Catastrophe' 公式为ε ( T ) 温度变化的函数表征以及 NDE 与T通过类似于为临界液体开发的关系的演变。基于活化能指数的动态特性分析排除了 Vogel-Fulcher-Tammann (VFT) 关系作为描绘初级弛豫时间演变的有效工具。这一结果对作为确定动态交叉温度的最可靠工具的常用“Stickel 算子”程序提出了质疑。特别是强电场从根本上影响弛豫时间的分布、初级弛豫时间的演化形式和脆性。本文获得的结果支持隐藏在T g以下的可能的半连续相变的概念. 这些研究是在过冷角鲨烯中进行的,这种材料具有极低的电导率、极长的分子,对于生物学和医学相关问题至关重要。
更新日期:2021-09-27
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