Issue 16, 2016

Dynamics of flexible active Brownian dumbbells in the absence and the presence of shear flow

Abstract

The dynamical properties of a flexible dumbbell composed of active Brownian particles are analytically analyzed. The dumbbell is considered as a simplified description of a linear active polymer. The two beads are independently propelled in directions which change in a diffusive manner. The relaxation behavior of the internal degree of freedom is tightly coupled to the dumbbell activity. The latter dominates the dynamics for strong propulsion. As is shown, limitations in bond stretching strongly influence the relaxation behavior. Similarly, under shear flow, activity determines the relaxation and tumbling behavior at strong propulsion. Moreover, shear leads to a preferred alignment and consequently to shear thinning. Thereby, a different power-law dependence on the shear rate compared to passive dumbbells under flow is found.

Graphical abstract: Dynamics of flexible active Brownian dumbbells in the absence and the presence of shear flow

Article information

Article type
Paper
Submitted
08 Dec 2015
Accepted
26 Feb 2016
First published
01 Mar 2016
This article is Open Access
Creative Commons BY license

Soft Matter, 2016,12, 3737-3749

Dynamics of flexible active Brownian dumbbells in the absence and the presence of shear flow

R. G. Winkler, Soft Matter, 2016, 12, 3737 DOI: 10.1039/C5SM02965A

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