Different mechanisms for dynamical arrest in largely asymmetric binary mixtures
Different mechanisms for dynamical arrest in largely asymmetric binary mixtures
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DOI：
10.1103/physreve.91.032308
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发表时间：
2015-03-16
影响因子：
2.4
通讯作者：
Laurati, M.
中科院分区：
文献类型：
--
作者：
Hendricks, J.;Capellmann, R.;Laurati, M.
利用共聚焦显微镜，我们研究了大尺寸非对称二元胶体混合物，特别是大球体动态阻滞态的形成。系统的体积分数保持不变，随着小球浓度的增加，我们观察到大球到不同阻挡状态的一系列转变：吸引玻璃、凝胶和不对称玻璃。这些状态通过动态停滞的程度以及结构和动力学异质性的数量来区分。两种不同的滞留状态之间的转变通过熔化和形成流态发生。虽然在滞留状态和流体状态下都发现了跨空间的键合粒子网络，但只有阻挡状态的特征是存在动态滞留粒子的跨空间网络。
Using confocal microscopy we investigate binary colloidal mixtures with large size asymmetry, in particular the formation of dynamically arrested states of the large spheres. The volume fraction of the system is kept constant, and as the concentration of small spheres is increased we observe a series of transitions of the large spheres to different arrested states: an attractive glass, a gel, and an asymmetric glass. These states are distinguished by the degree of dynamical arrest and the amount of structural and dynamical heterogeneity. The transitions between two different arrested states occur through melting and the formation of a fluid state. While a space-spanning network of bonded particles is found in both arrested and fluid states, only arrested states are characterized by the presence of a space-spanning network of dynamically arrested particles.