Regensburg 2010 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 6: Poster Session I
DY 6.27: Poster
Monday, March 22, 2010, 16:00–18:00, Poster B2
Measuring Hindered Transport and Self-Diffusion by Means of Optical and NMR Methods — •Tom Kirchner1, Christian Chmelik1, Helge Bux2, Jürgen Caro2, Lars Heinke1, Florian Hibbe1, Tobias Titze1, and Jörg Kärger1 — 1University of Leipzig, Faculty of Physics and Earth Science, Linnéstr. 5, D-04103 Leipzig, Germany — 2Leibniz University Hannover, Callinstr. 3a, D-30167 Hannover, Germany
Infrared micro-imaging and pulsed field gradient NMR allow to obtain the transport and
selfdiffusivities of a probe molecule in the same host material and over comparable
length scales. In a systematic study, we compare directly both quantities in one and the same system,
namely methanol in a representatve of the famous novel group of nanoporous materials (MOF
ZIF-8). Following this approach, an unexpected behaviour has been obtained: the self-diffusion of
methanol notably exceeds the transport diffusion in a wide range of loadings. This finding is rationalized by considering the strong inter-molecular interaction and
the dominating role of inter-cage hopping in mass transfer in the systems under study.