Universal aging features in the restructuring of fractal colloidal gels
Universal aging features in the restructuring of fractal colloidal gels
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DOI：
10.1103/physrevlett.84.2275
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发表时间：
2000-03-06
影响因子：
8.6
通讯作者：
Weitz, DA
中科院分区：
文献类型：
--
作者：
Cipelletti, L;Manley, S;Weitz, DA
我们使用多散斑动态光散射测量动态结构因子，f（q，τ），由胶体聚集形成的凝胶。虽然凝胶是弹性固体，但f（q，tau）在长时间尺度上几乎完全衰减，具有不寻常的形式，f（q，tau）类似于exp{-（tau/tau（f））（mu）}，其中mu近似为1.5，并且tau（f）与q（-1）成比例。老化导致tau（f）的急剧增加，然而，所有数据都可以在单个主曲线上缩放，tau（f）随着年龄逐渐线性增长。这种行为与无序玻璃体系中的老化预测惊人地相似，为这些概念的普遍性提供了令人信服的证据。
We use multispeckle dynamic light scattering to measure the dynamic structure factor, f(q, tau), of gels formed by aggregation of colloids. Although the gel is an elastic solid, f(q, tau) nearly completely decays on long time scales, with an unusual form, f(q, tau) similar to exp{-(tau/tau(f))(mu)}, with mu approximate to 1.5 and with tau(f) proportional to q(-1) A model for restructuring of the gel with aging correctly accounts for this behavior. Aging leads to a dramatic increase in tau(f) however, all data can be scaled on a single master curve, with tau(f) asymptotically growing linearly with age. This behavior is strikingly similar to that predicted for aging in disordered glassy systems, offering convincing proof of the universality of these concepts.