Regensburg 2007 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: POSTER: Biological Systems + New Materials

CPP 20.22: Poster

Mittwoch, 28. März 2007, 16:00–18:30, Poster B

Self-assembled treelike patterns from an evaporating binary solution — •Leonid Govor, Gottfried Bauer, and Jürgen Parisi — Institute of Physics, University of Oldenburg, Carl-von-Ossietzky Str. 9-11, D-26129 Oldenburg, Germany

Spontaneous formation of treelike patterns which developed during evaporation of the solvent from a phase-separated bilayer resulting from a binary polymer solution spin-coated onto a solid substrate has been studied. The initial bilayer consists of a poly(isobutyl methacrylate) (BMA) layer on top of a nitrocellulose (NC) solution layer. During evaporation, the top BMA layer becomes unstable and transforms into short ridges. Finally, the inhomogeneous evaporation of the solvent from the NC solution layer connects the BMA ridges to treelike patterns. To support our model, we present results of a complementary experiment based on casting of the BMA solution on an inclined glass substrate.