Preprint Article Version 1 NOT YET PEER-REVIEWED

A Rapid Magnetofluidic Micromixer Using Diluted Ferrofluid

  1. Queensland Micro and Nanotechnology Centre, Griffith University, Brisbane, Queensland 4111, Australia
Version 1 : Received: 18 October 2016 / Approved: 18 October 2016 / Online: 18 October 2016 (08:00:38 CEST)

How to cite: Hejazian, M.; Nguyen, N. A Rapid Magnetofluidic Micromixer Using Diluted Ferrofluid. Preprints 2016, 2016100071 (doi: 10.20944/preprints201610.0071.v1). Hejazian, M.; Nguyen, N. A Rapid Magnetofluidic Micromixer Using Diluted Ferrofluid. Preprints 2016, 2016100071 (doi: 10.20944/preprints201610.0071.v1).

Abstract

Effective and rapid mixing is essential for various chemical and biological assays. The present work reports 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 paramagnetic 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 90 % in a relatively short microchannel.

Subject Areas

magnetic; microfluidics; mixing; magnetoconvection; ferrofluid

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