Molecular dynamics in zeolitic host systems

Huwe, A.; Kremer, F.; Kärger, J.; Behrens, P.; Schwieger, W.; Ihlein, G.; Weiß, Ö.; Schüth, F.

doi:10.1016/S0167-7322(99)00138-5

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Molecular dynamics in zeolitic host systems

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Weiß, Ö.
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schüth, F.
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Huwe, A., Kremer, F., Kärger, J., Behrens, P., Schwieger, W., Ihlein, G., et al. (2000). Molecular dynamics in zeolitic host systems. Journal of Molecular Liquids, 86(1-3), 173-182. doi:10.1016/S0167-7322(99)00138-5.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-47C6-2

Abstract

Broadband dielectric spectroscopy (10^-2Hz - 10⁹Hz) is employed to study the molecular dynamics of the simple glassforming liquid ethylene glycol (EG) being confined to zeolites of varying size and topology. A sharp transition is observed from a single molecule dynamics (with an Arrhenius-type temperature dependence) to that of a liquid (with a temperature dependence of the mean relaxation rate according to a Vogel-Fulcher-Tammann-law (VFT-law)): While EG in silicalite and H-ZSM-5 (showing a single-molecule relaxation) has a coordination number of four, EG in zeolite beta or AIPO₄-5 has a coordination number of five and behaves like a bulk liquid.