Hostname: page-component-745bb68f8f-v2bm5 Total loading time: 0 Render date: 2025-02-05T04:59:06.488Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Kortunov, P., Vasenkov, S., Kärger, J., et al. , Chem. Mater 17, 2466 (2005).Google Scholar
2. Fluid Catalytic Cracking V. Materials and Technological Innovations, ed. Ocelli, M. L. and O'Connor, P., (Elsevier, Amsterdam, 2001).Google Scholar
3. Binder, W. H., Barragan, V., and Menger, F. M., Angew. Chem. Int. Ed. 42, 5802 (2003).Google Scholar
4. Devaux, P. F. and Morris, R., Traffic 5, 241 (2004).Google Scholar
5. Kärger, J. and Ruthven, D. M., Diffusion in Zeolites and Other Microporous Solids (Wiley & Sons, New York, 1992).Google Scholar
6. Callaghan, P. T., Principles of NMR Microscopy (Clarendon Press, Oxford, 1991).Google Scholar
7. Blümich, B., NMR Imaging of Materials (Clarendon Press, Oxford, 2000).Google Scholar
8. Galvosas, P., Stallmach, F., Seiffert, G., et al. , J. Magn. Reson. 151, 260 (2001).Google Scholar
9. Cotts, R. M., Hoch, M. J. R., Sun, T., et al. , J. Magn. Reson. 83, 252 (1989).Google Scholar
10. Oradd, G. and Lindblom, G., Magn. Reson. Chem. 42, 123 (2004).Google Scholar
11. Oradd, G., Westerman, P. W., and Lindblom, G., Biophys. J. 89, 315 (2005).Google Scholar
12. Filippov, A., Oradd, G., and Lindblom, G., Biophys. J. 86, 891 (2004).Google Scholar
13. Berger, C., Gläser, R., Rakoczy, R. A., et al. , Microporous Mesoporous Mater. 83, 333 (2005).Google Scholar
14. Geier, O., Vasenkov, S., and Karger, J., J. Chem. Phys. 117, 1935 (2002).Google Scholar
15. Kahya, N., Scherfeld, D., Bacia, K., et al. , J. Biol. Chem. 78, 28109 (2003).Google Scholar