Connecting shear thinning and dynamic heterogeneity in supercooled liquids by localized elasticity.

IF 3.1 2区 化学 Q3 CHEMISTRY, PHYSICAL
Ke-Qi Zeng, Dong-Xu Yu, Zhe Wang
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引用次数: 0

Abstract

Supercooled liquids exhibit complicated dynamical behaviors: At the microscopic level, the dynamics is heterogeneous spatially, known as dynamic heterogeneity. At the macroscopic level, the shear viscosity decreases as the shear rate increases with a power law, known as shear thinning. The relation between these two universal dynamical phenomena remains elusive. With simulations of several model liquids in two and three dimensions, we show that they are quantitatively bridged by localized elasticity embodied as transient clusters that elastically respond to shear. Prominent dynamic heterogeneity emerges right after the massive yielding of these clusters, which is initiated by shear transformation zones and facilitated by elasticity-mediated interaction. With this picture, a scaling law relating shear thinning to the characteristic length of dynamic heterogeneity is found.

用局部弹性理论连接过冷液体的剪切减薄与动态非均质性。
过冷液体表现出复杂的动力学行为:在微观水平上,动力学在空间上是不均匀的,称为动力学非均质性。在宏观水平上,剪切粘度随着剪切速率的增加呈幂律下降,称为剪切变薄。这两种普遍的动力现象之间的关系仍然难以捉摸。通过对几种模型液体在二维和三维的模拟,我们发现它们是通过局部弹性进行定量桥接的,表现为对剪切有弹性响应的瞬态簇。这些团簇在大量屈服后出现了明显的动态非均质性,这是由剪切转变区引发的,并由弹性介导的相互作用促进。通过这幅图,我们发现了剪切变薄与动态非均质特征长度之间的标度规律。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Chemical Physics
Journal of Chemical Physics 物理-物理:原子、分子和化学物理
CiteScore
7.40
自引率
15.90%
发文量
1615
审稿时长
2 months
期刊介绍: The Journal of Chemical Physics publishes quantitative and rigorous science of long-lasting value in methods and applications of chemical physics. The Journal also publishes brief Communications of significant new findings, Perspectives on the latest advances in the field, and Special Topic issues. The Journal focuses on innovative research in experimental and theoretical areas of chemical physics, including spectroscopy, dynamics, kinetics, statistical mechanics, and quantum mechanics. In addition, topical areas such as polymers, soft matter, materials, surfaces/interfaces, and systems of biological relevance are of increasing importance. Topical coverage includes: Theoretical Methods and Algorithms Advanced Experimental Techniques Atoms, Molecules, and Clusters Liquids, Glasses, and Crystals Surfaces, Interfaces, and Materials Polymers and Soft Matter Biological Molecules and Networks.
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