Dresden 2006 – scientific programme
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DS: Dünne Schichten
DS 24: Poster presentation
DS 24.1: Poster
Tuesday, March 28, 2006, 15:00–17:30, P2
Argon: bulk, sheets and nanotubes — •Karin Schmalzl1,2, Maikel Rheinstaedter2, and Dieter Strauch3 — 1Forschungszentrum Juelich, 52425 Juelich, Germany — 2Institut Laue-Langevin, BP 156 - 38042 Grenoble, France — 3Institut fuer Theoretische Physik, Universitaet Regensburg, Germany
Condensed matter in geometrical confinement like nanoporous matrices allows to study the change of dynamics due to spatial restrictions. We investigated 36Argon adsorbed in nanoporous Gelsil Glass by inelastic neutron scattering. At low filling fractions the atoms form an amorphous adsorbate film on the pore walls. At higher fillings, a capillary condensate forms in the pore center. The preparation of single or of several monolayers were possible what permitted the study of, e.g., the dynamical interaction between the third and second layer.
We compare the measured density of states of different fillings with the ones calculated with ab initio calculations . The calculations were done with LDA and GGA pseudopotentials. We studied rods and hollow cylinders with different number of atoms to appraoch the different fillings of the pores.
We also investigated the dynamics of a 2D system like a monolayer, double layer and several layers of atoms and followed in this way the transition to the bulk state.