Regensburg 2013 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 34: Poster: Wetting, Micro and Nano Fluidics
CPP 34.7: Poster
Mittwoch, 13. März 2013, 16:30–18:30, Poster C
X-ray photon correlation spectroscopy (XPCS) study of nanospheres in parabolic microflow — •Raphael Urbani1, Fabian Westermeier2, Bernd Struth2, and Thomas Pfohl1 — 1Chemistry Department, University of Basel, 4056 Basel, Switzerland — 2Hasylab, Deutsches Elektronen-Synchrotron, 22607 Hamburg, Germany
The combination of state-of-the-art microfluidics with small angle X-ray scattering (SAXS) and X-ray photon correlation spectroscopy (XPCS) has been successfully used for dynamic investigations of colloidal particles in microflow with different geometric constraints.
Using a coherent X-ray beam of small size (about 10 µm x 10 µm) allows us to measure static and dynamic properties at different spatial positions within in the microfluidic channel system. We are able to measure autocorrelation functions at fixed q-positons in the range of 10−6 - 10−1 s with an APD-detector and simultaniously at a wide q-range in a temporal range of 4 x 10−3 - 102 s using a 2D fast readout detector. Analyzing the autocorrelation functions, we obtain detailed information about advective and diffusive transport within the microfluidic flow of different velocities and in different channel geometries such as curvatures and constrictions.
By means of the combination of XPCS with microfluidcs we probe spatially dependent the influence of microfluidic velocity fields, shear stress, hydrodynamic (wall) interactions and inertia effects on the transport behavior of the nanoparticles.