Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 25: Colloids and Complex Liquids I - Structure
CPP 25.3: Vortrag
Mittwoch, 16. März 2011, 11:15–11:30, ZEU 222
Pattern formation of colloidal suspensions by dip-coating: An in-situ grazing incidence X-ray scattering study — •Jan Perlich1, Matthias Schwartzkopf1, Volker Körstgens2, Peter Müller-Buschbaum2, Rainer Gehrke1, and Stephan V. Roth1 — 1HASYLAB-DESY, Notkestr. 85, D-22603 Hamburg (Germany) — 2TU München, Physik Department, LS Funkt. Mat., James-Franck-Str. 1, D-85748 Garching (Germany)
The dip-coating technique is one of the commonly applied methods for the preparation of thin films or the patterning of templates from polymer solutions and particle suspensions. We present an in-situ investigation of the dip-coating process of colloidal suspensions by the advanced scattering technique grazing incidence small angle X-ray scattering (GISAXS). The focus is on the real-time monitoring of the vertical dip-coating process to deliver an insight of the structural changes during pattern formation. With the selected measurement configuration a fixed spot on the sample surface is probed and the structural information at the time the contact line passes through the beam-illuminated area is obtained, hence revealing the structure at the vicinity of the flowing meniscus. After the in-situ GISAXS experiments, the as-prepared samples are analyzed by optical microscopy (OM) for an overall homogeneity check of the dip-coated thin film. Finally, the surface structures are investigated by atomic force microscopy (AFM), yielding topographic images and thus real space information about the structure heights and widths.