Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2010-09-12
Phys. Rev. E 83, 021802 (2011)
Physics
Condensed Matter
Soft Condensed Matter
18 pages, 1 figure
Scientific paper
10.1103/PhysRevE.83.021802
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, e.g., in nano-fluidic devices or in polymeric networks or solutions, these polymers are effectively confined in a channel- or tube-like 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 non-linear 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.
Frey Erwin
Obermayer Benedikt
Thüroff Florian
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