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Tethered fleximags as artificial cilia

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Babataheri, Avin, Roper, Marcus, Fermigier, Marc and Du Roure, Olivia. (2011) Tethered fleximags as artificial cilia. Journal of Fluid Mechanics, Vol.678 . pp. 5-13. ISSN 0022-1120

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Official URL: http://dx.doi.org/10.1017/S002211201100005X

Abstract

Flexible superparamagnetic filaments ('fleximags') are very slender elastic filaments, which can be driven by distributed magnetic torques to mimic closely the behaviour of biological flagella. Previously, fleximags have been used as a basis for artificial micro-swimmers capable of transporting small cargos Dreyfus et al. (Nature, vol. 437, 2005, p. 862). Here, we demonstrate how these filaments can be anchored to a wall to make carpets of artificial micro-magnetic cilia with tunable densities. We analyse the dynamics of an artificial cilium under both planar and three-dimensional beating patterns. We show that the dynamics are controlled by a single characteristic length scale varying with the inverse square root of the driving frequency, providing a mechanism to break the fore and aft symmetry and to generate net fluxes and forces. However, we show that an effective geometrical reciprocity in the filament dynamics creates intrinsic limitations upon the ability of the artificial flagellum to pump fluid when driven in two dimensions.

Item Type:	Journal Article
Subjects:	Q Science > QR Microbiology
Divisions:	Faculty of Science > Mathematics
Library of Congress Subject Headings (LCSH):	Flagella (Microbiology) -- Simulation methods, Cilia and ciliary motion -- Simulation methods
Journal or Publication Title:	Journal of Fluid Mechanics
Publisher:	Cambridge University Press
ISSN:	0022-1120
Date:	July 2011
Volume:	Vol.678
Page Range:	pp. 5-13
Identification Number:	10.1017/S002211201100005X
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	University of California, Berkeley. Miller Institute for Basic Research in Sciences, Ile de France
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URI:	http://wrap.warwick.ac.uk/id/eprint/38833