Direct measurement of Lighthill's energetic efficiency of a minimal magnetic microswimmer

The realization of artificial microscopic swimmers able to propel in viscous fluids is an emergent research field of fundamental interest and vast technological applications. For certain functionalities, the efficiency of the microswimmer in converting the input power provided through an external ac...

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Bibliographic Details
Published in:Nanoscale 2019-10, Vol.11 (4), p.18723-18729
Main Authors: Calero, Carles, García-Torres, José, Ortiz-Ambriz, Antonio, Sagués, Francesc, Pagonabarraga, Ignacio, Tierno, Pietro
Format: Article
Language:English
Subjects:
Actuation
Bioengineering
Bioenginyeria
Computational fluid dynamics
Computer simulation
Efficiency
Energy conversion efficiency
Ferromagnetism
Física
Hidrodinàmica
Hydrodynamics
Hèlices
Magnetism
Magnetisme
Nanoelectromechanical systems
Nanofluids
Nanorods
Power consumption
Propellers
Self-assembly
Sistemes nanoelectromecànics
Swimming
Viscous fluids
Àrees temàtiques de la UPC
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Summary:The realization of artificial microscopic swimmers able to propel in viscous fluids is an emergent research field of fundamental interest and vast technological applications. For certain functionalities, the efficiency of the microswimmer in converting the input power provided through an external actuation into propulsive power output can be critical. Here we use a microswimmer composed by a self-assembled ferromagnetic rod and a paramagnetic sphere and directly determine its swimming efficiency when it is actuated by a swinging magnetic field. Using fast video recording and numerical simulations we fully characterize the dynamics of the propeller and identify the two independent degrees of freedom which allow its propulsion. We then obtain experimentally the Lighthill's energetic efficiency of the swimmer by measuring the power consumed during propulsion and the energy required to translate the propeller at the same speed. Finally, we discuss how the efficiency of our microswimmer could be increased upon suitable tuning of the different experimental parameters. This work demonstrates the direct measurement of the Lighthill's energetic efficiency from a minimal colloid-nanorod magnetic microswimmer.
ISSN:2040-3364
2040-3372
DOI:10.1039/c9nr05825g