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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 25: Micro and Nano Fluidics III: Lab-on-Chip Geometries
CPP 25.1: Hauptvortrag
Donnerstag, 29. März 2007, 17:15–17:45, H37
Coupled electro-hydrodynamic force fields for the manipulation of objects in solutions — •Magnus Jaeger1, Maika Felten2, Guenter Fuhr1, Michael Stuke3, and Claus Duschl2 — 1Saarland University, Faculty Clinical Medicine, Department Medical Technology, Ensheimer Strasse 48, 66386 St. Ingbert, Germany — 2Fraunhofer Institute for Biomedical Engineering, Am Muehlenberg 13, 14476 Potsdam, Germany — 3Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
Presently, pumping of fluids in lab-on-chip systems still suffers from serious limitations. Theoretical and experimental investigations have shown that high-frequency travelling electric waves are well-suited to pump liquids through microchannels. The absence of any moving parts pre-destines this method for the design of microscaled fluid pumps. Depending on the frequency of the electric field used, different mechanisms lead to an effective fluid transport. We used impedance measurements to quantify the processes in the different frequency regimes. To analyse the flow profile above the electrodes, Fluorescence Correlation Spectroscopy was carried out. Furthermore, we scaled the whole system down to the nanometer range. Since the electrodes that generate the force on the fluid are installed at the channel walls, this method shows great promise for overcoming the enormous frictional forces in nanostructures. This work is part of the Priority Programme 1164 "Nano- & Microfluidics: Bridging the Gap between Molecular Motion and Continuum Flow" and funded by the Deutsche Forschungsgemeinschaft under the reference number JA 17 17 / 1 - 2.