The European Physical Journal E

, Volume 17, Issue 4, pp 485–491 | Cite as

Different pathways in mechanical unfolding/folding cycle of a single semiflexible polymer

  • N. Yoshinaga
  • K. Yoshikawa
  • T. Ohta
Original Article


Kinetics of conformational change of a semiflexible polymer under mechanical external field were investigated with Langevin dynamics simulations. It is found that a semiflexible polymer exhibits large hysteresis in mechanical folding/unfolding cycle even with a slow operation, whereas in a flexible polymer, the hysteresis almost disappears at a sufficiently slow operation. This suggests that the essential features of the structural transition of a semiflexible polymer should be interpreted at least on a two-dimensional phase space. The appearance of such large hysteresis is discussed in relation to different pathways in the loading and unloading processes. By using a minimal two-variable model, the hysteresis loop is described in terms of different pathways on the transition between two stable states.


36.20.-r Macromolecules and polymer molecules 87.15.La Mechanical properties 05.70.Fh Phase transitions: general studies 


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Copyright information

© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2005

Authors and Affiliations

  1. 1.Department of Physics, Graduate School of SciencesKyoto UniversityKyotoJapan
  2. 2.Yukawa Institute for Theoretical PhysicsKyoto UniversityKyotoJapan

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