Regensburg 2010 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 5: Diffusion and Point Defects I

MM 5.4: Vortrag

Montag, 22. März 2010, 11:00–11:15, H6

Fluid transport in one dimensional channel systems — •Ramona Baum, Florian Hibbe, Sergej Naumov, Jörg Kärger, and Rustem Valiullin — Department of Interface Physics, University of Leipzig, Germany

Interference microscopy (IFM) is a well-suited experimental technique for studying transport of guest molecules in nanoporous materials [1]. A sufficient spatial resolution, which is in the range of micrometers enables the monitoring of the evolution of concentration profiles under non-equilibrium conditions. The transient concentration profiles, which are the result of a change in the ambient pressure, therefore allow the study of the adsorption and desorption kinetics. L-zeolite represents an important model system to study molecular transport in nanopores. It is a crystal with a length of 7 to 8 μm with one dimensional channels arranged in a hexagonal pattern. Such organization of the pore structure allows most unambiguous verification of theoretical predictions about the diffusion process [2]. In this work, we present the data on molecular transport of propane in L-zeolite assessed using IFM. The results obtained, revealing the one dimensional character of the diffusion process, are in good correlation with the crystallographic structure of this material.

[1]L.Heinke,D.Tzoulaki, C.Chmelik, F.Hibbe, J.M.van Baten, H.Lim, J.Li, R.Krishna, J.Kärger, Phys.Rev.Lett. 102, 065901 (2009)

[2] J.Kärger, R.Valiullin, S.Vasenkov, New Journal of Physics 7 (2005) 1-15.