Berlin 2008 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: POSTERS Micro- and Nanofluidics

CPP 22.24: Poster

Mittwoch, 27. Februar 2008, 16:00–18:30, Poster A

Surface scattering characterization of the fluid/substrate interface in a fluidic experiment — •J.-F. Moulin and P. Mueller-Buschbaum — TU Muenchen, Physik-Department, LS E13, James-Franck-Str.1, 85747 Garching (Germany)

We will present the results of Grazing Incidence X-Ray Scattering (GISAXS) performed on fluidic channels. Scattering methods such as Grazing incidence x-ray scattering (GISAXS) provide a wealth of information about the interfacial structure: with such an experimental technique both the in-plane ordering and the out of plane correlations are detected and quantitatively characterized in a non invasive/non destructive manner. Up to now this technique has never been used to characterize samples under flow. We have thus designed a new setup to perform GISAXS during a fluidic experiment where a solution is run over a substrate [1]. Together with state of the art GISAXS synchrotron beamlines such as BW4 at Hasylab (Hamburg, Germany) this setup makes it possible to map the structure of the liquid/solid interface of a fluidic channel at spots separated by c.a. 50 microns along the flow direction.

We will here present results obtained on detection of gold nanoparticles at the fluid/substrate interface as well as on the way these particles form a thin film under flow and how the structure of this film evolves with time.

[1]Flow at interfaces: a new device for x-ray surface scattering investigations, J-.F. Moulin, S .V. Roth, P. Müller-Buschbaum accepted for publication in Review of Scientific Instruments (2007)