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- W2030148913 abstract "We report the exploration of diamagnetic repulsion forces for the selective manipulation of microparticles inside microfluidic devices. Diamagnetic materials such as polymers are repelled from magnetic fields, an effect greatly enhanced by suspending a diamagnetic object in a paramagnetic Mn(2+) solution. The versatility of diamagnetic repulsion is demonstrated for the trapping, focussing and deflection of polystyrene particles for three example applications. Firstly, magnet pairs with unlike poles facing each other were arranged along a microcapillary to trap plugs of differently functionalised particles for a simultaneous surface-based assay in which biotin was selectively bound to a plug of streptavidin coated particles utilising only 22nL of reagent. Secondly, by slightly modifying the magnetic field design, the rapid focussing of particles into a narrow central stream at a flow rate of 650microms(-1) was accomplished for particle pre-concentration. In a third application, 5 and 10microm polystyrene particles were separated from each other in continuous flow by passing the particle mixture through a microfluidic chamber with a perpendicular magnetic field, a method termed diamagnetophoresis. The separation was investigated between flow rates of 20-100microL h(-1), with full resolution of the particle populations being achieved at 20microL h(-1). These experiments show the potential of diamagnetic repulsion for simple, label-free manipulation of particles and other diamagnetic objects such as cells for a range of bioanalytical techniques." @default.
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- W2030148913 date "2009-12-01" @default.
- W2030148913 modified "2023-09-26" @default.
- W2030148913 title "Diamagnetic repulsion—A versatile tool for label-free particle handling in microfluidic devices" @default.
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- W2030148913 doi "https://doi.org/10.1016/j.chroma.2009.06.039" @default.
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