Anomalous dynamics of intruders in a crowded environment of mobile obstacles.
Anomalous dynamics of intruders in a crowded environment of mobile obstacles.
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DOI：
10.1038/ncomms11133
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发表时间：
2016-04-04
影响因子：
16.6
通讯作者：
Laurati M
中科院分区：
文献类型：
--
作者：
Sentjabrskaja T;Zaccarelli E;De Michele C;Sciortino F;Tartaglia P;Voigtmann T;Egelhaaf SU;Laurati M
许多自然和工业过程依赖于受限的运输，例如蛋白质在细胞中的移动，纳米复合材料或凝胶中的颗粒，高密度集体中的个体以及车辆交通条件。这些是在拥挤的环境中运动的例子，其中主矩阵可能保留一些玻璃样的动态。在这里，我们研究约束运输的胶体模型系统中，稀释的小球在一个缓慢重排，玻璃状矩阵的大球移动。使用共焦差分动态显微镜和模拟，在这里，我们发现了一个临界尺寸不对称，出现异常的集体运输的小颗粒，表现为对数衰减的密度自相关函数。我们表明，矩阵的流动性是中央所观察到的异常行为。这些结果，关键取决于尺寸引起的动态不对称性，是相关的广泛的现象，从玻璃系统到细胞生物学。 经典的Lorentz气体模型被广泛用于描述约束输运，但它的静止环境假设并不适用于许多生物和工业过程。在这里，作者表明，流动性的矩阵诱导异常，对数动力学的约束粒子。
Many natural and industrial processes rely on constrained transport, such as proteins moving through cells, particles confined in nanocomposite materials or gels, individuals in highly dense collectives and vehicular traffic conditions. These are examples of motion through crowded environments, in which the host matrix may retain some glass-like dynamics. Here we investigate constrained transport in a colloidal model system, in which dilute small spheres move in a slowly rearranging, glassy matrix of large spheres. Using confocal differential dynamic microscopy and simulations, here we discover a critical size asymmetry, at which anomalous collective transport of the small particles appears, manifested as a logarithmic decay of the density autocorrelation functions. We demonstrate that the matrix mobility is central for the observed anomalous behaviour. These results, crucially depending on size-induced dynamic asymmetry, are of relevance for a wide range of phenomena ranging from glassy systems to cell biology. The classical Lorentz gas model is widely used to describe constrained transport, but its assumption of an immobile environment is not applicable to many biological and industrial processes. Here, the authors show that the mobility of the matrix induces anomalous, logarithmic dynamics of the confined particles.