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arXiv 2302.05084cond-mat.softcond-mat.stat-mech
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中程有序控制稠密胶体液体的动力学

Intermediate-range order governs dynamics in dense colloidal liquids

Navneet Singh, Zhen Zhang, A. K. Sood, Walter Kob, Rajesh Ganapathy

摘要:

传统观点认为,液体是完全无序的,在最近邻距离之外缺乏重要的结构。最近的观察颠覆了这一观点,并表明液体中的微观结构惊人地丰富,在许多物理,生物和工业过程中起着关键作用。然而,揭示这种结构的方法要么是系统特定的,要么产生的结果在物理上并不直观。在这里,通过单粒子分辨三维共聚焦显微镜成像和使用最近推出的四点关联函数,我们表明,双分散胶体液体具有高度非平凡的结构,包括交替层与二十面体和十二面体的顺序,它远远超出最近邻的距离和增长与过冷。通过量化粒子水平上的系统的动态,我们建立了这是一个中程秩序,而不是短程秩序,它具有一个一对一的相关性与动力学的不均匀性,一个属性直接相关的玻璃液体的弛豫动力学。我们的实验结果提供了一个直接的和备受追捧的液体的结构和动力学之间的联系,并为探索这种中程秩序在其他液态过程的后果铺平了道路。

英文摘要:

The conventional wisdom is that liquids are completely disordered and lack non-trivial structure beyond nearest-neighbor distances. Recent observations have upended this view and demonstrated that the microstructure in liquids is surprisingly rich and plays a critical role in numerous physical, biological, and industrial processes. However, approaches to uncover this structure are either system-specific or yield results that are not physically intuitive. Here, through single-particle resolved three-dimensional confocal microscope imaging and the use of a recently introduced four-point correlation function, we show that bidisperse colloidal liquids have a highly non-trivial structure comprising alternating layers with icosahedral and dodecahedral order, which extends well-beyond nearest-neighbor distances and grows with supercooling. By quantifying the dynamics of the system on the particle level, we establish that it is this intermediate-range order, and not the short-range order, which has a one-to-one correlation with dynamical heterogeneities, a property directly related to the relaxation dynamics of glassy liquids. Our experimental findings provide a direct and much sought-after link between the structure and dynamics of liquids and pave the way for probing the consequences of this intermediate-range order in other liquid state processes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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