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arXiv 1302.2896cond-mat.soft
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随机约束流体的局域化动力学

Localization dynamics of fluids in random confinement

Thomas O. E. Skinner, Simon K. Schnyder, Dirk G. A. L. Aarts, Juergen Horbach, Roel P. A. Dullens

摘要:

利用胶体模型实验和分子动力学模拟研究了二维流体在障碍物随机矩阵中的动力学行为。通过改变实验中的流体和基质面积分数,我们发现在小基质面积分数和本地化运动的示踪剂在高基质面积分数的离域示踪剂粒子动力学。在离域区域中,动态是subdiffusive在中间的时间,和扩散在很长的时间,而在本地化的制度,捕获在有限的口袋中的矩阵观察。这些观测结果与限制在弱关联矩阵中的理想气体的模拟结果一致。我们的研究结果表明,具有软相互作用的洛伦兹气体系统表现出平滑的临界动力学,因此一个圆形的离域到本地化的过渡。

英文摘要:

The dynamics of two-dimensional fluids confined within a random matrix of obstacles is investigated using both colloidal model experiments and molecular dynamics simulations. By varying fluid and matrix area fractions in the experiment, we find delocalized tracer particle dynamics at small matrix area fractions and localized motion of the tracers at high matrix area fractions. In the delocalized region, the dynamics is subdiffusive at intermediate times, and diffusive at long times, while in the localized regime, trapping in finite pockets of the matrix is observed. These observations are found to agree with the simulation of an ideal gas confined in a weakly correlated matrix. Our results show that Lorentz gas systems with soft interactions are exhibiting a smoothening of the critical dynamics and consequently a rounded delocalization-to-localization transition.

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