Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: Poster: Glass Transition and Dynamics of Liquids
CPP 22.7: Poster
Dienstag, 15. März 2011, 18:00–20:00, P2
Confinement-induced glass transition of n-butanol in silicon-nanochannels — •Carsten Biehl, Rene Berwanger, and Rolf Pelster — FR 7.2 Experimentalphysik, Universität des Saarlandes, D-66123 Saarbrücken, Germany
We have investigated the molecular dynamics of n-butanol, C4H9OH, confined in mesoporous silicon oxide with a mean pore radius of 7 nm. In contrast to the bulk material, confined butanol does not crystallize upon slow cooling. Using dielectric spectroscopy we observe a glass transition and determine the glass transition temperature Tg. Upon slow heating we observe indications for a partial crystallization in the temperature range above 125 K. We compare these results to measurements on quenched bulk butanol showing the formation of a metastable glacial state as a result of a frustrated crystallization process [1,2].
[1] I. M. Shmyt’ko. R. J. Jiménez-Riobóo, M. Hassaine and A. A. Ramos, J. Phys.: Condens. Matter 22, 195102 (2010)
[2] M. Hassaine et al, J. Chem. Phys. 131, 174508 (2009)