Active colloidal chains with cilia- and flagella-like motion

It has been shown that self-assembled chains of active colloidal particles can present sustained oscillations. These oscillations are possible because the effective diffusiophoretic forces that mediate the interactions of colloids do not respect the action-reaction principle and hence, a Hopf bifurc...

Full description

Saved in:
Bibliographic Details
Published in:New journal of physics 2018-05, Vol.20 (5), p.53014
Main Authors: Gonzalez, S, Soto, R
Format: Article
Language:English
Subjects:
active colloids
Anchoring
Asymmetry
Bifurcation theory
Chains
cilia
Colloids
flagella
Hopf bifurcation
Oscillations
Parameters
Physics
Self-assembly
self-propelled particles
Traveling waves
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:It has been shown that self-assembled chains of active colloidal particles can present sustained oscillations. These oscillations are possible because the effective diffusiophoretic forces that mediate the interactions of colloids do not respect the action-reaction principle and hence, a Hopf bifurcation is possible even for overdamped dynamics. Anchoring the particles in one extreme breaks the head-tail symmetry and the oscillation is transformed into a traveling wave pattern, and thus the chain behaves like a beating cilium. The net force on the anchor, estimated using the resistive force theory, vanishes before the bifurcation and thereafter grows linearly with the bifurcation parameter. If the mobilities of the particles on one extreme are reduced to mimic an elongated cargo, the traveling wave generates a net velocity on the chain that now behaves like a moving flagellum. The average velocity again grows linearly with the bifurcation parameter. Our results demonstrate that simplified systems, consisting only of a few particles with non-reciprocal interaction and head-tail asymmetry, show beating motion and self-propulsion. Both properties are present in many non-equilibrium models thus making our results a general feature of active matter.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/aabe3c