Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 10: Wetting, Micro and Nanofluidics
CPP 10.2: Vortrag
Montag, 31. März 2014, 15:15–15:30, ZEU 114
Layer erosion by crossflow: in-situ detection using microfluidics and GISAXS — Gerd Herzog1, Matthias Schwartzkopf1, Berit Heidmann1, Shun Yu1, Frans de Jong2, Michael Schlüter2, Volker Körstgens3, Peter Müller-Buschbaum3, and •Stephan V. Roth1 — 1DESY, Notkestr. 85, D-22607 Hamburg, Germany — 2Institute of Multiphase Flows, Hamburg University of Technology, Eißendorfer Str. 38, D-21073 Hamburg, Germany — 3TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, D-85748 Garching, Germany
The process of inorganic coating (scaling) and fouling of organic matter under crossflow conditions is very important in many technical applications, e.g. membrane modules, heat exchangers, coatings for surfaces (airplanes, automobiles, ships), windows, textiles, etc. Despite this fact, the physical process of scaling and fouling as well as the reduction of scaling and fouling under crossflow conditions is not well understood because the molecular interaction forces between particles and surface are difficult to estimate and the shear stresses that act at the particles are difficult to describe. Therefore we use microbeam grazing incidence small-angle X-ray scattering (µGISAXS) to investigate the dynamic deposition and erosion behavior of particles at surfaces. Polymeric colloids on a glass plate have been detected in a microfluidic cell by means of µGISAXS under water crossflow conditions. Depending on the choice of colloidal layer (surface functionalization), the time series of the measurements show a significant reduction of colloids on the surface and thereby image the erosion process quantitatively.