Unfolding of a diblock chain and its anomalous diffusion induced by active particles
arXiv:1806.01489 · doi:10.1063/1.5095850
Abstract
We study the structural and dynamical behaviors of a diblock copolymer chain in a bath of active Brownian particles (ABPs) by extensive Brownian dynamics simulation in a two-dimensional model system. Specifically, the A block of chain is self-attractive, while the B block is self-repulsive. We find, beyond a threshold, the A block unfolds with a pattern like extracting a woolen string from a ball. The critical force decreases with the increase of the B block length,NB, for short cases, then keeps a constant with further increase of NB. In addition, we find a power law exists between the unfolding time of chain and active force, Fa, as well as NB. Finally, we focus on the translational and rotational diffusion of chain, and find that both of them remain supper-diffusive at the long time limit for small active forces due to an asymmetry distribution of ABPs. Our results open new routes for manipulating polymer's behaviors with ABPs.
arXiv comment11 pages, 7 figures
References in corpus (20)
- Active Particles in Complex and Crowded Environments
- Statistical Mechanics of Interacting Run-and-Tumble Bacteria
- Collective Motion of Vibrated Polar Disks
- Arrested phase separation in reproducing bacteria: a generic route to pattern formation?
- Self-Starting Micromotors in a Bacterial Bath
- Dynamics of Self-Propelled Particles Under Strong Confinement
- How to capture active particles
- Active particles with soft and curved walls: Equation of state, ratchets, and instabilities
- Transport powered by bacterial turbulence
- Unusual swelling of a polymer in a bacterial bath
- Activity induced collapse and re-expansion of rigid polymers
- Facilitation of polymer looping and giant polymer diffusivity in crowded solutions of active particles
- Traveling fronts in active-passive particle mixtures
- Generic long-range interactions between passive bodies in an active fluid
- Chain reconfiguration in active noise
- Deformation of a soft boundary induced and enhanced by enclosed active particles
- Thermal and Athermal Swarms of Self-Propelled Particles
- Motion of two micro-wedges in a turbulent bacterial bath
- Transition between globule and stretch states of a self-attracting chain in the repulsive active particle bath
- Beating of grafted chains induced by active Brownian particles