Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 2: Nanoengineered thin films

DS 2.4: Vortrag

Montag, 26. März 2012, 13:15–13:30, H 0111

Ultraschall unterstützte Deposition von kolloidalen Kristallen — •Sabine Wollmann, Hubert Krenner, and Achim Wixforth — Universität Augsburg, Universitätsstraße 1, 86159 Augsburg

Colloidal crystals are a versatile system to realize templates and masks for etching and deposition processes or to realize photonic band gap materials. We present investigations on ultrasonic assisted deposition of colloidal crystals employing surface acoustic waves. For this, droplets of an aqueous solution of polystyrene beads with diameters ranging from 0,5 μm to 3 μm are drying under surface acoustic wave agitation. The beads show a periodical arrangement after the water is evaporated. By means of optical diffraction we study in-situ the resulting colloidal films for different colloid concentrations, evaporations rate of the solvent and the pulse width and amplitude of the surface acoustic wave. We present first results on an improved formation of ordered domains and a control of the nucleation site within the droplet under acoustic agitation.