Polymer-Chain Configurations in Active and Passive Baths

Abstract

The configurations taken by polymers embedded in out-of-equilibrium baths may have broad effects in a variety of biological systems. As such, they have attracted considerable interest, particularly in simulation studies. Here we analyze the distribution of configurations taken by a passive flexible chain in a bath of hard, self-propelled, vibrated disks and systematically compare it to that of the same flexible chain in a bath of hard, thermal-like, vibrated disks. We demonstrate experimentally that the mean length and mean radius of gyration of both chains obey Flory's Law. However, the Kuhn length associated with the number of correlated monomers is smaller in the case of the active bath, corresponding to a higher effective temperature. Importantly, the active bath does not just simply map on a hot equilibrium bath. Close examination of the chains' configurations indicates a marked bias, with the chain in the active bath more likely assuming configurations with a single prominent bend.

4 pages, 4 figures

References in corpus (6)

• Hydrodynamic attraction of swimming microorganisms by surfaces
• Nonequilibrium equation of state in suspensions of active colloids
• The physics of active polymers and filaments
• Unusual swelling of a polymer in a bacterial bath
• Activity induced collapse and re-expansion of rigid polymers
• Active polymer rings: activity-induced collapse and dynamical arrest

Cited by in corpus (4)

• Inclusions, Boundaries and Disorder in Scalar Active Matter
• Transport of molecules via polymerization in chemical gradients
• Spiral folding of a flexible chain of chiral active particles
• Traveling Fronts and the Smoothing of the Collective-Motion Phase Transition in Vibrated Polar Disks