A reconfigurable superparamagnetic bead filter for microfluidic detection of bio-material

M. Matteucci, F.G.A. Homburg, S. Pelt, van, A.H. Dietzel

Research output: Contribution to journalArticleAcademicpeer-review


For a faster and more efficient sensing of highly diluted samples, up-concentration of biological species is often required. Within this framework, we here describe the design, fabrication and first experimental results of a compact microfluidic chip that uses the capture and release of micron-sized superparamagnetic beads for species up-concentration. The beads are captured out of the bypassing flow by soft-magnetic structures embedded in the microchannel that can be magnetized by an external field. Simulations of bead capture are reported for average flow speeds up to 50 mm/s that are equivalent to flow rates of 0.03 l/s on a single channel. A comparison between the experimental results obtained with an average flow speed of 4.44 mm/s (flow rate of about 0.028 l/s) and finite element method (FEM) simulations of the bead capture is shown. From the obtained results we can conclude that an up-scaled version of such a chip could easily scan fluids with flow rates above 1 l/s.
Original languageEnglish
Pages (from-to)742-746
JournalMicroelectronic Engineering
Issue number5-8
Publication statusPublished - 2010


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