Effect of temperature and density fluctuations on the spatially heterogeneous dynamics of glass-forming Van der Waals liquids under high pressure.
Effect of temperature and density fluctuations on the spatially heterogeneous dynamics of glass-forming Van der Waals liquids under high pressure.
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DOI：
10.1103/physrevlett.111.125701
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发表时间：
2013-09
影响因子：
8.6
通讯作者：
K. Koperwas;A. Grzybowski;K. Grzybowska;Z. Wojnarowska;Alexei P. Sokolov;M. Paluch
中科院分区：
文献类型：
--
作者：
K. Koperwas;A. Grzybowski;K. Grzybowska;Z. Wojnarowska;Alexei P. Sokolov;M. Paluch
在这封信中，我们将展示温度和密度波动如何影响环境压力和高压下的空间非均匀动力学。利用货车德瓦耳斯液体的高压实验数据，我们研究了温度和密度涨落对动力学不均匀性的贡献。我们发现，在恒定的结构弛豫时间（等时条件）的动态不均匀性随压力的增加显着降低，而弛豫谱的加宽保持不变。这一观察结果质疑了光谱增宽和动力学不均匀性之间的关系。
In this Letter, we show how temperature and density fluctuations affect the spatially heterogeneous dynamics at ambient and elevated pressures. By using high-pressure experimental data for van der Waals liquids, we examine contributions of the temperature and density fluctuations to the dynamics heterogeneity. We show that the dynamic heterogeneity decreases significantly with increasing pressure at a constant structural relaxation time (isochronal condition), while the broadening of the relaxation spectrum remains constant. This observation questions the relationship between spectral broadening and dynamic heterogeneity.