环的刚性拓扑筛选
Topological Sieving of Rings According to their Rigidity
摘要：
我们提出了一种新的机制来解决在复杂环境中流动的纳米级圆形聚合物的机械刚度。环和基底之间的拓扑相互作用引起的负微分迁移率的出现是选择性筛选具有不同柔性的环状聚合物的关键机制。一个简单的模型准确地描述了在分子动力学模拟中观察到的筛分过程，并产生实验验证的分析预测，这可以用作改进圆形长丝过滤程序的参考指南。我们提出的拓扑筛选机制应该是相关的，也在探测复杂基板的微观细节。
英文摘要：
We present a novel mechanism for resolving the mechanical rigidity of nanoscopic circular polymers that flow in a complex environment. The emergence of a regime of negative differential mobility induced by topological interactions between the rings and the substrate is the key mechanism for selective sieving of circular polymers with distinct flexibilities. A simple model accurately describes the sieving process observed in molecular dynamics simulations and yields experimentally verifiable analytical predictions, which can be used as a reference guide for improving filtration procedures of circular filaments. The topological sieving mechanism we propose ought to be relevant also in probing the microscopic details of complex substrates.
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