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Issue 44, 2016
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Flow-induced nonequilibrium self-assembly in suspensions of stiff, apolar, active filaments

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Abstract

Active bodies in viscous fluids interact hydrodynamically through self-generated flows. A stiff, apolar, active filament generates symmetric fluid flow around it and thus cannot self-propel. Here we study the mobility and aggregation induced by hydrodynamic flow in a suspension of stiff, apolar, active filaments. We consider two types of active filaments, with those producing extensile or contractile flows along their long axis. Lateral hydrodynamic attractions in extensile filaments lead, independent of the volume fraction, to anisotropic aggregates which translate and rotate ballistically. Lateral hydrodynamic repulsions in contractile filaments lead to microstructured states, where the degree of clustering increases with the volume fraction and the filament motion is always diffusive. Our results demonstrate that the interplay between active hydrodynamic flows and anisotropic excluded volume interactions provides a generic nonequilibrium mechanism for hierarchical self-assembly of active soft matter.

Graphical abstract: Flow-induced nonequilibrium self-assembly in suspensions of stiff, apolar, active filaments

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Article information


Submitted
15 Sep 2016
Accepted
14 Oct 2016
First published
14 Oct 2016

Soft Matter, 2016,12, 9068-9076
Article type
Paper

Flow-induced nonequilibrium self-assembly in suspensions of stiff, apolar, active filaments

A. Pandey, P. B. Sunil Kumar and R. Adhikari, Soft Matter, 2016, 12, 9068 DOI: 10.1039/C6SM02104B

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