Longitudinal response of confined semiflexible polymers.
Longitudinal response of confined semiflexible polymers.
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受限半柔性聚合物的纵向响应。
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Erwin Frey
中科院分区：
文献类型：
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作者：
Florian Thüroff;B. Obermayer;Erwin Frey
已知单个半柔性聚合物对外部施加的力的突然变化的纵向响应由主链张力的传播和松弛控制。在许多实验情况下，例如在纳米流体装置或聚合物网络或溶液中实现，这些聚合物被有效地限制在通道或管状几何形状中。通过启发式的标度律和严格的分析理论，我们分析了各种通用的实验装置的限制半柔性聚合物的拉伸动力学。结果表明，与众所周知的线性响应相反，约束对非线性动力学的影响在很大程度上可以描述为有效预应力的影响。我们还研究了初始受限链的自由弛豫，发现了一个令人惊讶的超线性~t（9/8）增长规律的变化，在短时间内的端到端的距离。
The longitudinal response of single semiflexible polymers to sudden changes in externally applied forces is known to be controlled by the propagation and relaxation of backbone tension. Under many experimental circumstances, realized, for example, in nanofluidic devices or in polymeric networks or solutions, these polymers are effectively confined in a channel- or tubelike geometry. By means of heuristic scaling laws and rigorous analytical theory, we analyze the tension dynamics of confined semiflexible polymers for various generic experimental setups. It turns out that in contrast to the well-known linear response, the influence of confinement on the nonlinear dynamics can largely be described as that of an effective prestress. We also study the free relaxation of an initially confined chain, finding a surprising superlinear ~t(9/8) growth law for the change in end-to-end distance at short times.