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Surface Response of a Polymer Network: Semi-infinite Network
Langmuir ( IF 3.7 ) Pub Date : 2020-04-01 , DOI: 10.1021/acs.langmuir.9b03448
Chen Bar-Haim 1 , Haim Diamant 1
Affiliation  

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.

中文翻译:

聚合物网络的表面响应:半无限网络

我们使用双流体模型从理论上研究了半无限粘弹性聚合物网络的表面响应。我们关注于过度限制的极限以及网络固有长度尺度的影响。我们计算缓慢的表面波动的衰减率,以及响应于局部力的表面位移。大型连续谱响应的偏差远大于网络的网格大小。我们讨论表面散射和微流变学的含义。我们提供了可用于表面微流变学的封闭形式的表达式:从表面上的示踪剂颗粒的运动中提取粘弹性模量和固有长度尺度,而无需掺杂散装材料。
更新日期:2020-04-03
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