Active colloids at fluid interfaces

If an active Janus particle is trapped at the interface between a liquid and a fluid, its self-propelled motion along the interface is affected by a net torque on the particle due to the viscosity contrast between the two adjacent fluid phases. For a simple model of an active, spherical Janus colloi...

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Bibliographic Details
Published in:Soft matter 2016-01, Vol.12 (17), p.47-423
Main Authors: Malgaretti, P, Popescu, M. N, Dietrich, S
Format: Article
Language:English
Subjects:
Colloids
Computational fluid dynamics
Fluid flow
Fluids
Liquids
Nanoparticles
Phases
Translations
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Summary:If an active Janus particle is trapped at the interface between a liquid and a fluid, its self-propelled motion along the interface is affected by a net torque on the particle due to the viscosity contrast between the two adjacent fluid phases. For a simple model of an active, spherical Janus colloid we analyze the conditions under which translation occurs along the interface and we provide estimates of the corresponding persistence length. We show that under certain conditions the persistence length of such a particle is significantly larger than the corresponding one in the bulk liquid, which is in line with the trends observed in recent experimental studies. The motion of an active Janus particle trapped at a liquid-fluid interface is affected by a net torque due to the viscosity contrast between the adjacent fluid phases. The conditions under which translation along the interface occurs are analyzed.
ISSN:1744-683X
1744-6848
DOI:10.1039/c6sm00367b