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arXiv 2008.09385cond-mat.softcond-mat.dis-nn
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二维玻璃形成液体中笼状结构的剖析

Anatomy of cage formation in a 2D glass-forming liquid

Bo Li, Kai Lou, Walter Kob, Steve Granick

摘要:

玻璃状材料的坚固性被认为是由于每个颗粒周围由其邻居形成的笼,但实际上笼形成的细节仍然难以捉摸[1-4]。这种笼在正常液体开始显示玻璃态动力学的第一个迹象的起始温度/密度下开始形成。为了研究笼的形成,我们在这里使用聚焦激光器产生局部扰动的结构上的颗粒水平在2D胶体悬浮液和监控系统的非线性动态响应的视频显微镜。我们探测的所有观测值都显示出作为填充分数的函数的非单调响应,在起始密度处达到峰值。视频显微镜图像显示,这种最大的响应是由于域的建设与合作的动力学变得越来越刚性,并开始主导粒子动力学。这种来自微观流变变形的概念验证表明,在这种玻璃形成液体笼的形成与这些域的合并直接相关,从而阐明了玻璃形成的第一步[1,5]。

英文摘要:

The solidity of glassy materials is believed to be due to the cage formed around each particle by its neighbors, but in reality the details of cage-formation remain elusive [1-4]. This cage starts to be formed at the onset temperature/density at which the normal liquid begins to show the first signs of glassy dynamics. To study cage-formation we use here focused lasers to produce a local perturbation of the structure on the particle level in 2D colloidal suspensions and monitor by means of video microscopy the system's non-linear dynamic response. All observables we probed show a response which is non-monotonic as a function of the packing fraction, peaking at the onset density. Video microscopic images reveal that this maximum response is due to the buildup of domains with cooperative dynamics that become increasingly rigid and start to dominate the particle dynamics. This proof-of-concept from microrheological deformation demonstrates that in this glass-forming liquid cage formation is directly related to the merging of these domains, thus elucidating the first step in glass-formation [1, 5].

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