Berlin 2008 – scientific programme

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MA: Fachverband Magnetismus

MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)

MA 18.61: Poster

Tuesday, February 26, 2008, 15:15–18:30, Poster E

Microfluidic Separation System for Magnetic Beads — •Frank Wittbracht, Alexander Weddemann, and Andreas Hütten — Bielefeld University, Universitätsstraße 25, 33615 Bielefeld

Lab-on-a-chip technologies and the µTAS have gained importance in recent years. The ultimate goal is the integration of all functions and components needed for the analysis of a sample on microfluidic chips. Magnetic materials are used widely in these systems for different applications such as magnetohydrodynamic pumps and magnetic valves. Especially in terms of separation and detection of biological samples magnetic materials are suitable.

In this work a microfluidic separation system for magnetic beads was experimentally realized according to theoretical simulations. The separation of magnetic beads is achieved by magnetic gradient fields resulting from conducting lines that are structured on the fluidic chip. Silicon wafers are used as a substrate and enable the integration of XMR sensors into the microfluidic device. Microfluidic structures are built with SU-8 negative photo resist due to its excellent mechanical and chemical stability.