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首页> 外文期刊>The Journal of Chemical Physics >Viscoelasticity and Stokes-Einstein relation in repulsive and attractive colloidal glasses
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Viscoelasticity and Stokes-Einstein relation in repulsive and attractive colloidal glasses

机译：排斥和有吸引力的胶体玻璃的粘弹性和斯托克斯-爱因斯坦关系

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We report a numerical investigation of the viscoelastic behavior in models for steric repulsive and short-ranged attractive colloidal suspensions, along different paths in the attraction strength vs packing fraction plane. More specifically, we study the behavior of the viscosity (and its frequency dependence) on approaching the repulsive glass, the attractive glass, and in the reentrant region where viscosity shows a nonmonotonic behavior on increasing attraction strength. On approaching the glass lines, the increase of the viscosity is consistent with a power-law divergence with the same exponent and critical packing fraction previously obtained for the divergence of the density fluctuations. Based on mode-coupling calculations, we associate the increase of the viscosity with specific contributions from different length scales. We also show that the results are independent of the microscopic dynamics by comparing Newtonian and Brownian simulations for the same model. Finally, we evaluate the Stokes-Einstein relation approaching both glass transitions, finding a clear breakdown which is particularly strong for the case of the attractive glass.
机译：我们报告了在空间排斥和短距离吸引力胶体悬浮液模型中的粘弹性行为的数值研究，沿着吸引力强度与堆积分数平面的不同路径。更具体地说，我们研究了在接近排斥玻璃，吸引玻璃以及在凹入区域的粘度行为（及其与频率的关系），在该凹入区域中，粘度随吸引强度的增加而呈现非单调行为。在接近玻璃线时，粘度的增加与幂律发散相一致，幂律发散具有与先前为密度波动发散而获得的相同的指数和临界填充分数。基于模式耦合计算，我们将粘度的增加与来自不同长度尺度的特定贡献相关联。通过比较同一模型的牛顿和布朗仿真，我们还表明结果与微观动力学无关。最后，我们评估了接近两种玻璃转变的斯托克斯-爱因斯坦关系，发现了清晰的击穿现象，这对于吸引人的玻璃而言尤其重要。

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