Hendricks J, Capellmann R, Schofield A B, Egelhaaf S U, Laurati M
Condensed Matter Physics Laboratory, Heinrich-Heine University, Universitätsstr. 1, 40225 Düsseldorf, Germany.
SUPA, School of Physics & Astronomy, University of Edinburgh, Peter Guthrie Tait Road, Edinburgh EH9 3FD, United Kingdom.
Phys Rev E Stat Nonlin Soft Matter Phys. 2015 Mar;91(3):032308. doi: 10.1103/PhysRevE.91.032308. Epub 2015 Mar 16.
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.
我们使用共聚焦显微镜研究具有大尺寸不对称性的二元胶体混合物，特别是大球体动态停滞状态的形成。系统的体积分数保持恒定，随着小球体浓度的增加，我们观察到大球体向不同停滞状态的一系列转变：吸引性玻璃态、凝胶态和不对称玻璃态。这些状态通过动态停滞程度以及结构和动态不均匀性的量来区分。两种不同停滞状态之间的转变通过熔化和流体状态的形成而发生。虽然在停滞状态和流体状态中都发现了键合粒子的空间跨越网络，但只有停滞状态的特征是存在动态停滞粒子的空间跨越网络。
