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Relation Between Structure and Diffusion in Nanostructured Porous Solids and in Lipid Membranes

Published online by Cambridge University Press:  26 February 2011

Sergey Vasenkov  and
Jörg Kärger
Sergey Vasenkov
Affiliation:
Vasenkov@physik.uni-leipzig.de, Leipzig University, Physics, Linestrasse 5, Leipzig, N/A, 04103, Germany
Jörg Kärger
Affiliation:
kaerger@physik.uni-leipzig.de, Leipzig University, Physics
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Abstract

Pulsed field gradient (PFG) NMR technique has been applied to study molecular transport in two different types of nanostructured materials, viz. in fluid catalytic cracking (FCC) catalysts and in lipid membranes. Diffusion studies have been performed for a broad range of molecular displacements covering displacements that are as small as a fraction of a micron. The effective diffusivities recorded on various length scales are used to evaluate the relevance of various transport modes in the particles of FCC catalysts for the rate of molecular exchange between catalyst particles and the surrounding atmosphere. This rate is shown to be primarily related to the diffusion in the meso- and macropores of the particles under the condition of fast molecular exchange between these pores and the zeolite crystals located in the particles. Studies of lipid membranes are focused on developing fundamental understanding of the influence of various types of domains on lateral mobility of lipids. A meaningful study of this influence requires an ability of monitoring lipid diffusion for different displacements that are smaller and larger than the domain size. First PFG NMR data along this direction are presented.

Keywords

nuclear magnetic resonance (NMR)catalyticbiological
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 899: Symposium N – Dynamics in Small Confining Systems VIII , 2005 , 0899-N08-02
Copyright
Copyright © Materials Research Society 2006

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References

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