Bead Capture and Release on a Magnetic Sensor in a Microfluidic System

Bjarke Thomas Dalslet, Christian Danvad Damsgaard, S.C. Freitas, P.P. Freitas, Mikkel Fougt Hansen

    Research output: Contribution to conferencePosterResearchpeer-review

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    Abstract

    Planar Hall effect magnetic sensors for detection of biological agents using surface treated magnetic beads are integrated with a fluid injection system. The response of the sensors is used to evaluate bead capture rates for different bead concentrations c and fluid flow rates Q, and to monitor subsequent removal of the beads. It is found that the capture rate scales directly with c and that it depends linearly on Q. At low Q the capture rate is only partially due to gravitational sedimentation of beads. At higher Q an additional term proportional to Q becomes important, which is attributed to capture of beads by the magnetic fields near the sensor. It is shown that beads can be washed off the sensor surface.
    Original languageEnglish
    Publication date2008
    DOIs
    Publication statusPublished - 2008
    Event2008 IEEE Sensors - Lecce, Italy
    Duration: 26 Oct 200829 Oct 2008
    http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=4703548

    Conference

    Conference2008 IEEE Sensors
    CountryItaly
    CityLecce
    Period26/10/200829/10/2008
    Internet address

    Bibliographical note

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