Dresden 2006 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 24: POSTER Microfluidics

CPP 24.9: Poster

Thursday, March 30, 2006, 17:00–19:00, P2

Wetting properties of nanostructured composite surfaces and patterning of monolayer and polymer surfaces — •Oliver Bäumchen, Renate Fetzer, and Karin Jacobs — Experimental Physics, Saarland University, D-66123 Saarbrücken, Germany

Two main factors influence the wettability of a surface: On the one hand there is chemical heterogeneity (e.g. coatings or silane layers), on the other hand topographical roughness (surface structure) on the micro- and nanometer scale. Very rough surfaces can suspend small liquid drops and produce very large contact angles. Our goal is to fabricate and to characterize physically and chemically nanostructured surfaces. Moreover, we aim at characterizing the impact of microscopic local wetting properties to the macroscopic wetting behavior. By AFM, we study wetting at the nanoscale, whereas on the macroscale, we utilize optical microscopy. That way, we investigate a new nanocomposite material based on aluminum and its oxide [1], that exhibits complex topographical structures. In addition, we are interested in chemically structured surfaces and their wetting behavior. Therefore we utilize TEM masks to turn hydrophobic PDMS (poly(dimethylsiloxane)) films by plasma etching partially into hydrophilic silicone oxide-like layers. Furthermore we apply the microcontact-printing technique to pattern self-assembled thiol and silane monolayers on gold and silicon surfaces.

[1] M. Veith et al., Europ. J. Anorg. Chem. 24, 4387 (2003)