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Multiple and Mass Transfer of Magnetic Particles for Use in Biosensors
Dongyeon Keum,Paengro Lee,Kimin Hong IEEE 2011 IEEE transactions on magnetics Vol.47 No.9
<P>We studied a method of collecting small magnetic particles on a narrow metallic wire and transferring them between wires by using magnetic fields of electrical currents. By applying currents to a grid pattern of wires in specified directions, we could adjust direction of thermal drift of the particles in a fluid. We could collect a large amount of particles on a wire at an elevated speed aided by the drift. Gradual changes of the currents in two parallel wires enabled us to transfer the particles between the wires at a fast rate. The transfer could be reversed multiple times by switching the direction of currents. The multiple and mass control of the magnetic particles could be used for high sensitivity biosensors.</P>
Manipulation of Magnetic Beads by Magnetic Fields of Narrow Metallic Wires for Use in Biosensors
Dongyeon Keum,Lee, P.,Jungdae Kim,Kimin Hong IEEE 2009 IEEE transactions on magnetics Vol.45 No.6
<P>In this paper, we investigated a means to manipulate small magnetic beads using the magnetic fields of current-carrying wires. Narrow metallic wires were fabricated with optical lithography and vacuum deposition methods. As we applied 20-40 mA of current, the magnetic beads could be collected on the wire. Depending on the magnitude of the currents, the velocity of the beads was 2-20 mum/s. In addition to the motion of the beads by the interaction with the fields, we also observed drift of the beads caused by the local heating of the wire and the resulting temperature gradient. We also demonstrated transfer of beads between wires by switching the current between the wires. We consider that this simple device can be used to transfer the beads to the locations of the sensors and that it can increase the reaction probability between beads and magnetic sensors.</P>