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| Authors | L. Heinke, D. Tzoulaki, C. Chmelik, F. Hibbe, J.M. van Baten, H. Lim, Y. Li, R. Krishna, J. Kärger | | Title | Assessing guest diffusivities in porous hosts from transient concentration profiles |
| Journal | Physical Review Letters |
| Volume | 102 |
| Year | 2009 |
| Issue | 6 |
| Pages | 065901- |
| ISSN | 00319007 |
| Faculty | Faculty of Science |
| Institute/dept. | FNWI: Van 't Hoff Institute for Molecular Sciences (HIMS) |
| Abstract | Using the short-chain-length alkanes from ethane to n-butane as guest molecules, transient concentration profiles during uptake or release (via interference microscopy) and tracer exchange (via IR microimaging) in Zn(tbip), a particularly stable representative of a novel family of nanoporous materials (the metal organic frameworks), were recorded. Analyzing the spatiotemporal dependence of the profiles provides immediate access to the transport diffusivities and self-diffusivities, yielding a data basis of unprecedented reliability for mass transfer in nanoporous materials. As a particular feature of the system, self- and transport diffusivities may be combined to estimate the rate of mutual passages of the guest molecules in the chains of pore segments, thus quantifying departure from a genuine single-file system. |
| Document type | Article |
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