Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22230
Title: Effect of patterned micro-magnets on superparamagnetic beads in microchannels
Authors: Guo, SS
Deng, YL
Zhao, LB
Chan, HLW 
Zhao, XZ
Issue Date: 2008
Publisher: Institute of Physics Publishing
Source: Journal of physics. D, Applied physics, 2008, v. 41, no. 10, 105008 How to cite?
Journal: Journal of physics. D, Applied physics 
Abstract: The trapping response of patterned micro-magnets (PMMs) was studied based on the parameters affecting superparamagnetic beads in microfluidic channels. Using replica moulding and electroplating technologies, the PMMs were fabricated on the microchannel bottom, which generated sufficient magnetic forces to bias the moments of magnetic particles in a flowing stream. A simplified physical principle was used to analyse the relative velocity of the magnetic particle in the confined space of a microchannel. The results revealed that the magnetic force contributed to the fluidic flow rate as well as to the hydrodynamic drag force. The relative velocity of magnetic particles was dependent on the frequency under an external magnetic field driven by an alternate current (ac) source. It showed that the magnetic gradient induced hysteresis characteristics of the transmission spectrum, associated with the interaction of superparamagnetic beads and magnetic field.
URI: http://hdl.handle.net/10397/22230
ISSN: 0022-3727
EISSN: 1361-6463
DOI: 10.1088/0022-3727/41/10/105008
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