How a local active force modifies the structural properties of polymers
Abstract
We study the dynamics of a polymer, described as a variant of a Rouse chain, driven by an active terminal monomer (head). The local active force induces a transition from a globule-like to an elongated state, as revealed by the study of the end-to-end distance, whose variance is analytically predicted under suitable approximations. The change in the relaxation times of the Rouse-modes produced by the local self-propulsion is consistent with the transition from globule to elongated conformations. Moreover also the bond-bond spatial correlation for the chain head results to be affected and a gradient of over-stretched bonds along the chain is observed. We compare our numerical results both with the phenomenological stiff-polymer theory and several analytical predictions in the Rouse-chain approximation.
Cite
@article{arxiv.1911.06688,
title = {How a local active force modifies the structural properties of polymers},
author = {Laura Natali and Lorenzo Caprini and Fabio Cecconi},
journal= {arXiv preprint arXiv:1911.06688},
year = {2020}
}