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Micromachines 2017, 8(2), 37; doi:10.3390/mi8020037

A Rapid Magnetofluidic Micromixer Using Diluted Ferrofluid

Queensland Micro and Nanotechnology Centre, Griffith University, Brisbane, QLD 4111, Australia
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Author to whom correspondence should be addressed.
Academic Editors: Yong Kweon Suh and Zhigang Wu
Received: 18 October 2016 / Revised: 2 January 2017 / Accepted: 19 January 2017 / Published: 25 January 2017
(This article belongs to the Collection Lab-on-a-Chip)
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Abstract

Effective and rapid mixing is essential for various chemical and biological assays. The present work describes a simple and low-cost micromixer based on magnetofluidic actuation. The device takes advantage of magnetoconvective secondary flow, a bulk flow induced by an external magnetic field, for mixing. A superparamagnetic stream of diluted ferrofluid and a non-magnetic stream are introduced to a straight microchannel. A permanent magnet placed next to the microchannel induced a non-uniform magnetic field. The magnetic field gradient and the mismatch in magnetic susceptibility between the two streams create a body force, which leads to rapid and efficient mixing. The micromixer reported here could achieve a high throughput and a high mixing efficiency of 88% in a relatively short microchannel. View Full-Text
Keywords: magnetic; microfluidics; mixing; magnetoconvection; ferrofluid magnetic; microfluidics; mixing; magnetoconvection; ferrofluid
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Hejazian, M.; Nguyen, N.-T. A Rapid Magnetofluidic Micromixer Using Diluted Ferrofluid. Micromachines 2017, 8, 37.

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