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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

Official Date:

July 2011

Dates:

Date	Event
July 2011	Published

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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