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arXiv 1403.0928cond-mat.soft
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活性玻璃的动力学和流变学

Dynamics and rheology of active glasses

T. F. F. Farage, J. M. Brader

摘要:

在模式耦合理论的框架内,我们提出了一个简单的模型来描述密集的活动(自推进)的球形胶体粒子的组件。对于各向同性悬浮液,我们证明了玻璃化转变转移到更高的体积分数,通过添加活性,与最近的布朗动力学模拟。预测了活动引起的流体静态结构因子的变化。主动玻璃施加的应变的机械响应被示出为比相应的被动玻璃软;非遍历性参数和屈服应力随着活动的增加而降低。

英文摘要:

Within the framework of mode-coupling theory, we present a simple model for describing dense assemblies of active (self-propelled) spherical colloidal particles. For isotropic suspensions, we demonstrate that the glass transition is shifted to higher volume fraction by the addition of activity, in agreement with recent Brownian dynamics simulations. Activity-induced changes in the static structure factor of the fluid are predicted. The mechanical response of an active glass to applied strain is shown to be softer than the corresponding passive glass; both the nonergodicity parameter and the yield stress reduce with increasing activity.

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