Issue 13, 2014

Dynamic trapping and two-dimensional transport of swimming microorganisms using a rotating magnetic microrobot

Abstract

Manipulation of microorganisms with intrinsic motility is a challenging yet important task for many biological and biomedical applications. Currently, such a task has only been accomplished using optical tweezers, while at the risk of averse heating and photodamage of the biological samples. Here, we proposed a new micro-robotic approach for fluidic trapping and two-dimensional transportation of motile microorganisms near a solid surface in fluids. We demonstrated selective trapping and transportation of individual freely swimming multi-flagellated bacteria over a distance of 30 μm (7.5 body length of the carrier) on a surface, using the rotational flows locally induced by a rotating magnetic microparticle. Only a weak uniform magnetic field (<3 mT) was applied to actuate the microparticle. The microparticle can translate on a glass substrate by rotating at a speed of up to 100 μm s−1, while providing a fluidic force of a few to tens of pico-Newtons.

Graphical abstract: Dynamic trapping and two-dimensional transport of swimming microorganisms using a rotating magnetic microrobot

Supplementary files

Article information

Article type
Paper
Submitted
01 jan 2014
Accepted
12 feb 2014
First published
12 feb 2014

Lab Chip, 2014,14, 2177-2182

Author version available

Dynamic trapping and two-dimensional transport of swimming microorganisms using a rotating magnetic microrobot

Z. Ye and M. Sitti, Lab Chip, 2014, 14, 2177 DOI: 10.1039/C4LC00004H

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