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.
|Publication status||Published - 2008|
|Event||2008 IEEE Sensors - Lecce, Italy|
Duration: 26 Oct 2008 → 29 Oct 2008
|Conference||2008 IEEE Sensors|
|Period||26/10/2008 → 29/10/2008|