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Molecular dynamics in zeolitic host systems

✍ Scribed by A. Huwe; F. Kremer; J. Ka¨rger; P. Behrens; W. Schwieger; G. Ihlein; O¨. Weiß; F. Schu¨th

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
441 KB
Volume
86
Category
Article
ISSN
0167-7322

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✦ Synopsis

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 singlemolecule dynamics (with an Arrhenius-type temperature dependence) to that of a li quid (with a temperature dependence of the mean relaxation rate according to a Vogel-Fulcher-Tammann-law (VET-law)): While EG in silicalite and H-ZSM-5 (showing a singlemolecule relaxation) has a coordination number of four, EG in zeolite beta or ALP04-5 has a coordination number of five and behaves like a bulk liquid.

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