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Micromachines 2017, 8(2), 37;

A Rapid Magnetofluidic Micromixer Using Diluted Ferrofluid

Queensland Micro and Nanotechnology Centre, Griffith University, Brisbane, QLD 4111, Australia
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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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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Hejazian, M.; Nguyen, N.-T. A Rapid Magnetofluidic Micromixer Using Diluted Ferrofluid. Micromachines 2017, 8, 37.

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