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Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 39: Phase transitions

O 39.1: Talk

Tuesday, March 23, 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 Huber11Technische 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.

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