As amorphous materials get jammed, both geometric and dynamic heterogeneity are observed. We investigate the correlation between the local geometric heterogeneity and local rearrangements in a slowly compressed bidisperse quasi-two-dimensional emulsion system. The compression is driven by evaporation of the continuous phase and causes the area packing fraction to increase from 0.88 to 0.99. We quantify the structural heterogeneity of the system using the radical Voronoi tessellation following the method of Rieser et al. [Phys. Rev. Lett. 116, 088001 (2016)]. We define two structural quantities characterizing local structure, the first of which considers nearest neighbors and the second of which includes information from second-nearest neighbors. We find that droplets in heterogeneous local regions are more likely to have local rearrangements. These rearrangements are generally T1 events where two droplets converge toward a void, and two droplets move away from the void to make room for the converging droplets. Thus, the presence of the voids tends to orient the T1 events. The presence of a correlation between the structural quantities and the rearrangement dynamics remains qualitatively unchanged over the entire range of packing fractions observed.

中文翻译：

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堵塞的二维乳液缓慢压缩过程中的重排

当非晶材料被堵塞时，会观察到几何和动态异质性。我们研究了缓慢压缩的双分散准二维乳液系统中局部几何异质性和局部重排之间的相关性。压缩由连续相的蒸发驱动，导致面积填充分数从 0.88 增加到 0.99。我们遵循 Rieser 等人的方法，使用激进的 Voronoi 曲面细分来量化系统的结构异质性。[物理。莱特牧师。 116 , 088001(2016)]。我们定义了两个表征局部结构的结构量，第一个考虑最近邻居，第二个包括来自第二最近邻居的信息。我们发现异质局部区域中的液滴更有可能发生局部重排。这些重排通常是 T1 事件，其中两个液滴向空隙会聚，并且两个液滴远离空隙为会聚的液滴腾出空间。因此，空隙的存在往往会定向 T1 事件。在观察到的整个堆积分数范围内，结构量和重排动力学之间存在的相关性在质量上保持不变。