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

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)


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
Issue number6
Publication statusPublished - Feb 11 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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