Dresden 2006 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 24: POSTER Microfluidics
CPP 24.12: Poster
Thursday, March 30, 2006, 17:00–19:00, P2
Nanoscale Flow-Cells and their Application — •Tilmann Rogge1, Kristin Mandisloh1, Timo Mappes1, Martina Schürmann2, Axel Rosenhahn2, Ahmed Abdelmonem2, and Michael Himmelhaus2 — 1Institut für Mikrostrukturtechnik, Forschungszentrum Karlsruhe, 76021 Karlsruhe — 2Angewandte Physikalische Chemie, Universität Heidelberg, 69120 Heidelberg
Our goal is to study aqueous, organic, and biological liquid flows in micro- and nanochannels. Although liquid flows in micro- and nanocapillaries usually still can be treated within the framework of conventional continuum mechanics, the situation differs from that in macrosystems due to the smaller characteristic length scales, such as channel length and width, and the significantly increased surface-to-volume ratio of the fluid and its surrounding. Therefore, the balance between the various forces contributing to the overall behavior of the fluidic system is changed. Since the flow velocities are small, interface forces are an important contribution to the overall performance of microfluidic devices. We use pressure tight flow cells with optically transparent windows allowing for optical investigations with UV-, VIS- and IR radiation. The micro- and nanostructures are fabricated by X-ray lithography and other lithographic methods yielding channel widths of some hundreds of nanometers and channel heights below 10 micrometers. An appropriate periphery allows the use of flow volumes in the nanoliter range. Applications of these flow cells are adsorption studies with non-linear optical techniques. Furthermore, digital in-line holography is used to track tracer particles carried by the flow. The results are compared to those obtained by conventional microscopy.