论文标题
直接证据证明了胶体玻璃形成器中无效的结构弛豫
Direct evidence of void induced structural relaxations in colloidal glass formers
论文作者
论文摘要
超冷液体中的颗粒动力学通常由弦样运动主导，在这种运动中，颗粒线的同时进行了激活的啤酒花。触发这些动作的结构特征，对于理解玻璃动力学至关重要，仍然引起极大争议。我们在高包装分数下实验研究了胶体玻璃形成器中的微观颗粒动力学。伴有小的多分散性导致玻璃结晶共存，晶体中空置形式的空隙可以可逆地扩散到玻璃中，并进一步诱导类似弦的运动。在玻璃中，空隙采用了由几个相邻的自由体积组成的准空间的形式，并通过其引起的类似弦乐运动来运输。在具有较大多分散性的完全玻璃系统中，观察到类似的准空间作用。移动粒子聚集成类似字符串或紧凑的几何形状，但是紧凑的粒子可以进一步分解为连接的字符串序列，从而确立它们的一般重要性。
Particle dynamics in supercooled liquids are often dominated by string-like motions in which lines of particles perform activated hops cooperatively. The structural features triggering these motions, crucial in understanding glassy dynamics, remain highly controversial. We experimentally study microscopic particle dynamics in colloidal glass formers at high packing fractions. With a small polydispersity leading to glass-crystal coexistence, a void in the form of a vacancy in the crystal can diffuse reversibly into the glass and further induces string-like motions. In the glass, a void takes the form of a quasi-void consisting of a few neighboring free volumes and is transported by the string-like motions it induces. In fully glassy systems with a large polydispersity, similar quasi-void actions are observed. The mobile particles cluster into string-like or compact geometries, but the compact ones can further be broken down into connected sequences of strings, establishing their general importance.
