论文标题
聚合物网络的表面响应：半无限网络
Surface response of a polymer network: Semi-infinite network
论文作者
论文摘要
从理论上讲，我们使用两流体模型研究了半无限粘弹性聚合物网络的表面响应。我们专注于过度阻尼的极限和网络内在长度尺度的效果。我们计算出缓慢的表面波动的衰减速率，以及响应局部力的表面位移。发现与大规模连续响应的偏差在长度尺度上比网络的网格大小大得多。我们讨论对表面散射和微流变学的影响。我们提供可用于表面微笑学的封闭形式表达式 - 从位于表面上的示踪剂颗粒的运动中提取粘弹性模量和内在的长度尺度，而无需掺杂散装材料。
We study theoretically the surface response of a semi-infinite viscoelastic polymer network using the two-fluid model. We focus on the overdamped limit and on the effect of the network's intrinsic length scales. We calculate the decay rate of slow surface fluctuations, and the surface displacement in response to a localized force. Deviations from the large-scale continuum response are found at length scales much larger than the network's mesh size. We discuss implications for surface scattering and microrheology. We provide closed-form expressions that can be used for surface microrheology -- the extraction of viscoelastic moduli and intrinsic length scales from the motions of tracer particles lying on the surface without doping the bulk material.
