Discontinuous thinning in active microrheology of soft complex matter.
Discontinuous thinning in active microrheology of soft complex matter.
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DOI：
10.1103/physreve.94.062610
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发表时间：
2016-02
期刊：
影响因子：
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通讯作者：
R. Wulfert;U. Seifert;T. Speck
中科院分区：
文献类型：
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作者：
R. Wulfert;U. Seifert;T. Speck
采用理论和数值模拟，我们证明了不连续的力变薄由于驱动运动的外部探头在主机介质。我们考虑两种情况：一个理想的无结构介质（模拟超软材料，如聚合物熔体）和一个相互作用的排斥粒子的稀释浴。当探针的驱动超过临界力时，介质的微粘度突然下降约一个数量级。这种现象发生在大探针和足够密集的宿主介质之间的强吸引力相互作用。
Employing theory and numerical simulations, we demonstrate discontinuous force thinning due to the driven motion of an external probe in a host medium. We consider two cases: an ideal structureless medium (modeling ultrasoft materials such as polymer melts) and a dilute bath of interacting repulsive particles. When the driving of the probe exceeds a critical force, the microviscosity of the medium drops abruptly by about an order of magnitude. This phenomenon occurs for strong attractive interactions between a large probe and a sufficiently dense host medium.