Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 36: Postersitzung (Elektronische Struktur, Grenzfl
äche fest-flüssig, Halbleiteroberfl
ächen und -grenzfl
ächen, Nanostrukturen, Oberfl
ächenreaktionen, Teilchen und Cluster, Struktur und Dynamik reiner Oberfl
ächen)
O 36.56: Poster
Montag, 7. März 2005, 15:00–18:00, Poster TU F
Dynamics of Nanodroplets — •Anja Habenicht1, Michael Olapinski2, Frank Burmeister3, Johannes Boneberg1, and Paul Leiderer1 — 1Universität Konstanz, Fachbereich Physik, LS Leiderer, 78457 Konstanz — 2LMU München, Sektion Physik, LS Kotthaus / AG Simmel, 80539 München — 3Fraunhofer Institut Werkstoffmechanik, 79108 Freiburg
Liquid metal nanodroplets are generated by a dewetting induced desorption process: flat metal nanostructures placed on a substrate are illuminated with an intensive short laser pulse. If heated over the melting point, the liquid nanostructures reduce their surface energy by reforming to spheres. For the large aspect ratios used here, this involves a vertical movement of the center of mass and due to inertia the droplets leave the surface. The velocity of the desorbed nanodroplets is measured with a light barrier technique where the scattering signal is converted into a velocity dependent particle density. Results for different structure dimensions and laser energies are shown. Further we show first results of impact experiments, where the liquid or solid droplets are landed on another substrate. The particles cool down during the flight due to thermal radiation. By catching at different distances the landing temperature can be varied and thus different outcomes of droplet impact are achieved.