Aging dynamics in a colloidal glass
Aging dynamics in a colloidal glass
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DOI：
10.1103/physreve.64.021510
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发表时间：
2001-08-01
影响因子：
2.4
通讯作者：
Meunier, J
中科院分区：
文献类型：
--
作者：
Abou, B;Bonn, D;Meunier, J
采用动态光散射（DLS）和粘度法研究了合成粘土拉土胶体悬浮液淬火至玻璃相后的老化动力学。DLS允许跟踪拉脱石粒子的扩散，并揭示有两种弛豫模式。快速模式对应于粒子在相邻粒子形成的“笼子”内的快速扩散。慢模对应于逃离笼：其平均弛豫时间随着玻璃的年龄呈指数级快速增长。此外，慢模态的弛豫时间分布很广，随着系统的老化，其分布越来越大。测量随着系统老化而伴随的粘度增加，我们可以将颗粒动力学的减慢与粘度联系起来。
The aging dynamics of colloidal suspensions of Laponite, a synthetic clay, is investigated using dynamic light scattering (DLS) and viscometry after a quench into the glassy phase. DLS allows to follow the diffusion of Laponite particles and reveals that there are two modes of relaxation. The fast mode corresponds to a rapid diffusion of particles within "cages" formed by the neighboring particles. The slow mode corresponds to escape from the cages: its average relaxation time increases exponentially fast with the age of the glass. In addition, the slow mode has a broad distribution of relaxation times, its distribution becoming larger as the system ages. Measuring the concomitant increase of viscosity as the system ages, we can relate the slowing down of the particle dynamics to the viscosity.