Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 39: Phase transitions
O 39.1: Vortrag
Dienstag, 23. März 2010, 15:00–15:15, H42
On the phase transition behaviour of confined molecular assemblies: The influence of the crystal structure on the freezing-melting transition — •Sebastian Mörz1, Christof Schäfer1, Andriy Kityk2, Klaus Knorr1, and Patrick Huber1 — 1Technische Physik, Universität des Saarlandes, Saarbrücken, Germany — 2Institute for Computer Science, Czestochowa University of Technology, Czestochowa, Poland
The phase transition behaviour of simple fluids is strongly altered when confined to a mesoporous sorbent. The formation of supercooled states during cooling gives rise to a pronounced hysteresis between freezing and melting of pore confined liquids. The nucleation mechanisms which initiate the solidification of the supercooled liquid are to date not entirely understood.
We present a comparative calorimetric study on different confined liquids (N2, Ar, CO) which elucidates the decisive influence of grain boundaries and crystal structure of the solidified material on the freezing transition.