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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >From heterogeneous probe rotation to the hydrodynamic limit
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From heterogeneous probe rotation to the hydrodynamic limit

机译：从异质探头旋转到流体动力极限

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摘要

The recognition of heterogeneous dynamics in single component supercooled liquids has greatly advanced our understanding of the dynamics in glass-forming materials. However, details such as persistence times and length scales associated with dynamically distinct domains remain to be resolved. The rotational correlation function of probe molecules in viscous liquids is used as a tool for exploring the rate exchange or the time a domain memorizes its initial relaxation rate. With high precision dielectric experiments, the dynamics of probe molecules is observed to slow down with increasing size of the guest relative to the host molecules. For the case of di-n-butylether in 3-methylpentane, the situation of purely exponential probe dynamics within dispersive host relaxation is achieved as a result of time averaging. The results suggest that rate exchange occurs on a time scale which is equal to the longest structural relaxation time of the system. (c) 2006 Elsevier B.V. All rights reserved.
机译：对单组分过冷液体中非均质动力学的认识大大提高了我们对玻璃成型材料动力学的理解。但是，诸如与动态不同域关联的持续时间和长度比例之类的细节仍有待解决。探针分子在粘性液体中的旋转相关函数用作探索速率交换或域记录其初始弛豫速率的时间的工具。通过高精度介电实验，观察到探针分子的动力学随着客体相对于宿主分子尺寸的增加而减慢。对于在3-甲基戊烷中的二正丁基醚，由于时间平均，因此在分散的主体弛豫范围内达到了纯指数探针动力学的情况。结果表明速率交换发生在一个时间尺度上，该时间尺度等于系统的最长结构弛豫时间。 （c）2006 Elsevier B.V.保留所有权利。

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