Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session T60: Poster Session III
1:00 PM,
Thursday, March 8, 2018
LACC
Room: West Hall A
Abstract ID: BAPS.2018.MAR.T60.366
Abstract: T60.00366 : Size-based Sorting of Magnetic Microparticles using Patterned Circular Arrays in Variable Magnetic Fields
Presenter:
Edward Cullom
(Physics, Rhodes College)
Authors:
Edward Cullom
(Physics, Rhodes College)
Noah Sanchez
(Physics, Rhodes College)
Robert Raulston
(Physics, Rhodes College)
Gregory Vieira
(Physics, Rhodes College)
The controlled locomotion of superparamagnetic microparticles is useful for lab-on-chip biomedical devices and sorting heterogeneous particle populations. We have built and refined a low-cost system capable of applying tunable magnetic forces and moving particles of varying sizes. Controlled locomotion is made possible by patterning micro-sized circular NiFe arrays onto a 1 cm2 silicon chip, generating magnetic traps at the circles’ peripheries when external fields are present. The direction of particle motion is determined by pre-programmed sequences of changing magnetic field and input from a joystick, allowing the user to manipulate the particles in real-time. Particles of varying sizes were used, ranging from 2μm − 4μm in diameter. For given field sequences, we have found that each particle has a maximum velocity, dependent on its size and selected features of the platform, at which it can travel across the array. At higher velocities, microparticles of differing sizes transverse the circular array at different rates. The particles posess an intrinsic cut-off velocity, dependent on diameter, at which they can no longer transverse the array. This allows the user to selectively manipulate particles of a particular size, potentially allowing for sorting of the microparticles.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.T60.366
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