论文标题
超冷液体中棒颗粒的动力学 - 探测动态异质性和无定形顺序
Dynamics of Rod like Particles in Supercooled Liquids -- Probing Dynamic Heterogeneity and Amorphous Order
论文作者
论文摘要
尽管进行了广泛的研究，但在玻璃形成的超冷液体中探测动态和静态相关性一直是数十年来的挑战。在从分子玻璃形成液体开始，密集的胶体系统到细胞集合开始的各种系统中，动态相关性表现为动态异质性。另一方面，在这些密集的混乱系统中，仅静态相关性的概念仍然难以捉摸，并且它的存在仍在积极争论中。我们提出了一种新的方法，可以使用棒状颗粒作为探针提取动态和静态相关性。该方法可以在实验中以及包括生物学相关系统在内的其他软物质系统中在分子玻璃形成液体中实现。我们还合理化了观察到的对数正态，例如在报道的实验研究中伸长探针分子的旋转时间的分布，以及一种在实验中提取动态和静态相关长度的新方法的建议。
Probing dynamic and static correlation in glass-forming supercooled liquids has been a challenge for decades in spite of extensive research. Dynamic correlation which manifests itself as Dynamic Heterogeneity is ubiquitous in a vast variety of systems starting from molecular glass-forming liquids, dense colloidal systems to collections of cells. On the other hand, the mere concept of static correlation in these dense disordered systems remain somewhat elusive and its existence is still actively debated. We propose a novel method to extract both dynamic and static correlations using rod-like particles as probe. This method can be implemented in molecular glass-forming liquids in experiments as well as in other soft matter systems including biologically relevant systems. We also rationalize the observed log-normal like distribution of rotational decorrelation time of elongated probe molecules in reported experimental studies along with a proposal of a novel methodology to extract dynamic and static correlation lengths in experiments.
