Shear-banding phenomena and dynamical behavior in a Laponite suspension.
Shear-banding phenomena and dynamical behavior in a Laponite suspension.
复制标题
合成锂皂石悬浮液中的剪切带现象和动力学行为。
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
G. Ruocco
中科院分区：
文献类型：
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作者：
F. Ianni;R. Di Leonardo;S. Gentilini;G. Ruocco
剪切本地化的Laponite的含水粘土悬浮液中进行了研究，通过动态光散射，它提供了访问系统的动态（零差模式）和本地速度分布（外差模式）。当剪切带形成时，在流动停止后不久，在两个带中观察到典型的凝胶相的动力学松弛。当剪切局部化发生时，也观察到流动行为的周期性振荡，这是典型的粘滑现象。这两个结果进行了讨论，在软玻璃态凝胶的各种理论模型。
Shear localization in an aqueous clay suspension of Laponite is investigated through dynamic light scattering, which provides access both to the dynamics of the system (homodyne mode) and to the local velocity profile (heterodyne mode). When shear bands form, a relaxation of the dynamics typical of a gel phase is observed in both bands soon after the flow stops. Periodic oscillations of the flow behavior, typical of a stick-slip phenomenon, are also observed when shear localization occurs. Both results are discussed in the light of various theoretical models for soft glassy gels.