Sección Fisicoquímica - INQUISUR, Universidad Nacional del Sur, Bahía Blanca, Argentina.
Phys Rev Lett. 2011 Aug 5;107(6):065704. doi: 10.1103/PhysRevLett.107.065704. Epub 2011 Aug 4.
We analyze data from confocal microscopy experiments of a colloidal suspension to validate predictions of rapid sporadic events responsible for structural relaxation in a glassy sample. The trajectories of several thousand colloidal particles are analyzed, confirming the existence of such rapid events responsible for the structural relaxation of significant regions of the sample, and complementing prior observations of dynamical heterogeneity. Thus, our results provide the first direct experimental verification of the emergence of relatively compact clusters of mobility which allow the dynamics to transition between the large periods of local confinement within its potential energy surface, in good agreement with the picture envisioned long ago by Adam and Gibbs and Goldstein.
我们分析了胶体悬浮液共焦显微镜实验的数据，以验证导致玻璃样品结构弛豫的快速稀疏事件的预测。分析了数千个胶体粒子的轨迹，证实了这些快速事件的存在，它们负责样品的显著区域的结构弛豫，并补充了先前关于动力学异质性的观察结果。因此，我们的结果提供了第一个对出现相对紧凑的流动性簇的直接实验验证，这些簇允许动力学在其位能表面的局部限制的大周期之间转变，这与很久以前 Adam 和 Gibbs 和 Goldstein 所设想的情况非常吻合。
