Assessing guest diffusivities in porous hosts from transient concentration profiles

Lars Heinke, Despina Tzoulaki, Christian Chmelik, Florian Hibbe, Jasper M. Van Baten, Hyuna Lim, Jing Li, Rajamani Krishna, Jörg Kärger

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60 Citations (Scopus)

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.

Original languageEnglish
Article number065901
JournalPhysical review letters
Volume102
Issue number6
DOIs
Publication statusPublished - Feb 11 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Cite this

    Heinke, L., Tzoulaki, D., Chmelik, C., Hibbe, F., Van Baten, J. M., Lim, H., Li, J., Krishna, R., & Kärger, J. (2009). Assessing guest diffusivities in porous hosts from transient concentration profiles. Physical review letters, 102(6), [065901]. https://doi.org/10.1103/PhysRevLett.102.065901