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  • Magnetofluidic spreading in microchannels

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    85173_1.pdf (549.8Kb)
    Author(s)
    Zhu, Gui-Ping
    Nam-Trung, Nguyen
    Griffith University Author(s)
    Nguyen, Nam-Trung
    Year published
    2012
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    Abstract
    We investigate the spreading phenomena caused by the interaction between a uniform magnetic field and a magnetic fluid in microchannels. The flow system consists of two liquids: a ferrofluid and a mineral oil. The ferrofluid consists of superparamagnetic nanoparticles suspended in an oil-based carrier. Under a uniform magnetic field, the superparamagnetic particles are polarized and represent magnetic dipoles. The magnetization of the magnetic nanoparticles leads to a force resulting in the change of diffusion behavior inside the microchannel. Mixing due to secondary flow close to the interface also contributes to the spreading ...
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    We investigate the spreading phenomena caused by the interaction between a uniform magnetic field and a magnetic fluid in microchannels. The flow system consists of two liquids: a ferrofluid and a mineral oil. The ferrofluid consists of superparamagnetic nanoparticles suspended in an oil-based carrier. Under a uniform magnetic field, the superparamagnetic particles are polarized and represent magnetic dipoles. The magnetization of the magnetic nanoparticles leads to a force resulting in the change of diffusion behavior inside the microchannel. Mixing due to secondary flow close to the interface also contributes to the spreading of the ferrofluid. The magnetic force acting on the liquid/liquid interface is caused by the mismatch of magnetization between the nanoparticles and surrounding liquid in a multiphase flow system. This paper examines the roles of magnetic force in the observed spreading phenomena. The effect of particles on the flow field is also considered. These phenomena would allow simple wireless control of a microfluidic system without changing the flow rates. These phenomena can potentially be used for focusing and sorting in cytometry.
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    Journal Title
    Microfluidics and Nanofluidics
    Volume
    13
    Issue
    4
    DOI
    https://doi.org/10.1007/s10404-012-1056-x
    Copyright Statement
    © 2012 Springer Berlin Heidelberg. This is an electronic version of an article published in Microfluidics and Nanofluidics, October 2012, Volume 13, Issue 4, pp 655-663. Microfluidics and Nanofluidics is available online at: http://link.springer.com/ with the open URL of your article.
    Subject
    Mechanical engineering
    Microelectromechanical systems (MEMS)
    Nanotechnology
    Publication URI
    http://hdl.handle.net/10072/50066
    Collection
    • Journal articles

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