Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)
O 27.108: Poster
Dienstag, 24. März 2009, 18:30–21:00, P2
n-Alkanes in Tubular Nanochannels: Phase Transition Behaviour and Capillary Filling — •Daniel Rau1, Patrick Huber1, and Oskar Paris2 — 1Faculty of Physics and Mechatronics Engineering, Saarland University, D-66041 Saarbrücken, Germany — 2Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Research Campus Golm, D-14424 Potsdam, Germany
We present time-dependent angle-dispersive and energy-dispersive small-angle x-ray diffraction experiments on the capillary filling of tubular nanochannels in a template-grown porous matrix (SBA-15) by a liquid hydrocarbon. These measurements reveal a square root of time, classical Lucas-Washburn law for the channel invasion dynamics. These spontaneous imbibition experiments are complemented by combined x-ray diffraction and specific heat measurements on the filled matrices, which allow us to study the phase transition behaviour of the spatially nanoconfined linear hydrocarbons.