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arXiv 2104.08412cond-mat.softcond-mat.mtrl-sci
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简单玻璃和凝胶形成液体的等待时间依赖性非平衡phase diagram

Waiting-time dependent non-equilibrium phase diagram of simple glass- and gel-forming liquids

Jesús Benigno Zepeda-López, Magdaleno Medina-Noyola

摘要:

在许多情况下,许多软硬材料都以令人困惑的非平衡非晶态形式存在,其性质不是稳定的,取决于制备。它们通常被总结为非常规的“相图”,展示新的“阶段”和/或“过渡”,其中时间是一个重要的变量。这项工作提出了一个解决问题的理论上定义和预测这些非平衡相和它们的时间演变的相图,给出了潜在的分子相互作用。我们证明了这些非平衡相和相应的非稳态(即,老化)相图确实可以使用不可逆过程的新的非平衡统计力学理论的动力学观点来定义和预测。这是说明与瞬态过程的动态逮捕到非平衡非晶态固体相的理论描述,瞬时淬火的简单模型流体,涉及排斥硬球加吸引力的方阱对相互作用。

英文摘要:

Under many circumstances many soft and hard materials are present in a puzzling wealth of non-equilibrium amorphous states, whose properties are not stationary and depend on preparation. They are often summarized in unconventional "phase diagrams" that exhibit new "phases" and/or "transitions", in which the time, however, is an essential variable. This work proposes a solution to the problem of theoretically defining and predicting these non-equilibrium phases and their time-evolving phase diagrams, given the underlying molecular interactions. We demonstrate that these non-equilibrium phases and the corresponding non-stationary (i.e., aging) phase diagrams can indeed be defined and predicted using the kinetic perspective of a novel non-equilibrium statistical mechanical theory of irreversible processes. This is illustrated with the theoretical description of the transient process of dynamic arrest into non-equilibrium amorphous solid phases, of an instantaneously-quenched simple model fluid involving repulsive hard-sphere plus attractive square well pair interactions.

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