Regensburg 2000 – scientific programme

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DY: Dynamik und Statistische Physik

DY 17: POSTER I

DY 17.23: Poster

Monday, March 27, 2000, 15:00–18:00, D

Thin film morphology of a new type of complex fluid — •Stefan Schlagowski, Ralf Seemann, Karin Jacobs, Stephan Herminghaus und Axel Busch — Abteilung Angewandte Physik, Universität Ulm, 89069 Ulm

We have studied the morphological changes and the dewetting behavior of thin films of surfactant encapsulated clusters (SEC) [1] on silicon substrates upon annealing.

These SEC consist of Molybdenium oxide clusters covered by a surfactant (DODA) forming spherical particles of diameter 3.5 nm. The interparticle interactions are expected to be purely of hard core/ van der Waals type and are in the order of thermal energies. This allows us to study a ßimple" solid resp. liquid whith constituent particles of a size accessible by e.g. atomic force microscopy.

Thin films of thicknesses between 10-500 nm can easily be prepared from SEC-solutions. Observations show how the initially smooth film forms polygonal terraces of monolayer height and small filaments that resemble domain borders after annealing at 180 ^∘C for several minutes. Further annealing leads to dewetting of the film.

[1] Surfactant encapsulated Clusters (SECs):
(DODA)₂₀(NH₄)[H₃Mo₅₇V₆(NO)₆O₁₈₃(H₂O) ₁₈]; D. G. Kurth et al., Science (in print)