Dresden 2006 – scientific programme

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AKB: Biologische Physik

AKB 40: Poster Session II

AKB 40.14: Poster

Wednesday, March 29, 2006, 16:30–19:30, P3

Pumping Nanofluidics Optically along Freely Defined Patterns — •Franz Weinert and Braun Dieter — Noether Group on Dissipative Microsystems, Applied Physics, Ludwig Maximilians Universität München, Amalienstr. 54, 80799 München, Germany

Liquid is pumped in thin films by nonlinear thermal expansion. The flow geometry is not defined by channels, but by the focus movement of an infrared laser scanning microscope. The fluid follows the laser path in reverse direction. Pumping matches a theory based on temperature dependent viscosity. For decreasing chamber thickness, pump speed rises quadratically, reaching 20um/s for 2.5um. Highly viscous liquids are pumped equally well. The technique frees micro- and nanofluidics from the load of channel lithography, delicate interfacing and complex pump design.