Conformation and Dynamics of a Long Active Polymer Chain Confined in a Circular Cavity

Xiao Yang; Yan-Li Zhou; Bin Zhao; Chao Wang; Meng-Bo Luo

doi:10.1007/s10118-024-3245-y

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Conformation and Dynamics of a Long Active Polymer Chain Confined in a Circular Cavity

RESEARCH ARTICLE | Updated：2024-12-31

- Conformation and Dynamics of a Long Active Polymer Chain Confined in a Circular Cavity
- Chinese Journal of Polymer Science Vol. 43, Issue 1, Pages: 225-234(2025)
- Affiliations：
  
  a.Department of Physics, Taizhou University, Taizhou 318000, China
  b.Department of Physics, Zhejiang University, Hangzhou 310027, China
- Author bio：
  
  chaowang0606@126.com
- Funds：
- DOI：10.1007/s10118-024-3245-y
  CLC：
- Received：15 August 2024，
  
  Revised：2024-09-25，
  
  Accepted：01 October 2024，
  
  Online First：28 November 2024，
  
  Published：01 January 2025
- Accepted：
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Yang, X.; Zhou, Y. L.; Zhao, B.; Wang, C.; Luo, M. B. Conformation and dynamics of a long active polymer chain confined in a circular cavity. Chinese J. Polym. Sci. 2025, 43, 225–234

Xiao Yang, Yan-Li Zhou, Bin Zhao, et al. Conformation and Dynamics of a Long Active Polymer Chain Confined in a Circular Cavity[J]. Chinese Journal of Polymer Science, 2025, 43(1): 225-234.
Yang, X.; Zhou, Y. L.; Zhao, B.; Wang, C.; Luo, M. B. Conformation and dynamics of a long active polymer chain confined in a circular cavity. Chinese J. Polym. Sci. 2025, 43, 225–234 DOI： 10.1007/s10118-024-3245-y.

Xiao Yang, Yan-Li Zhou, Bin Zhao, et al. Conformation and Dynamics of a Long Active Polymer Chain Confined in a Circular Cavity[J]. Chinese Journal of Polymer Science, 2025, 43(1): 225-234. DOI： 10.1007/s10118-024-3245-y.

摘要

The polymer with large activity forms stable compact spiral with directional rotation at the steady state. The formation of the stable compact spiral is a two-step relaxation process

where the polymer first forms a metastable swelling quasi spiral and then transforms into the stable compacted spiral near the wall of the cavity.

Abstract

The conformational and dynamical properties of a long semi-flexible active polymer chain confined in a circular cavity are studied by using Langevin dynamics simulation method. Results show that the steady radius of gyration of the polymer decreases monotonically with increasing the active force. Interestingly

the polymer forms stable compact spiral with directional rotation at the steady state when the active force is large. Both the radius of gyration and the angular velocity of the spiral are nearly independent of the cavity size

but show scaling relations with the active force and the polymer length. It is further found that the formation of the stable compact spiral in most cases is a two-step relaxation process

where the polymer first forms a metastable swelling quasi spiral and then transforms into the stable compacted spiral near the wall of the cavity. The relaxation time is mainly determined by the transformation of the swelling quasi spiral

and shows remarkable dependence on the size of the cavity. Specially

when the circumference of the circular is nearly equivalent to the polymer length

it is difficult for the polymer to form the compacted spiral

leading to a large relaxation time. The underlying mechanism of the formation of the compacted spiral is revealed.

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