Assessing guest diffusivities in porous hosts from transient concentration profiles

Heinke, Lars ; Tzoulaki, Despina ; Chmelik, Christian ; Hibbe, Florian ; van Baten, Jasper M. ; Lim, Hyuna ; Li, Jing ; Krishna, Rajamani ; Kärger, Jörg (2009) Assessing guest diffusivities in porous hosts from transient concentration profiles Physical Review Letters, 102 (6). 065901_1-065901_4. ISSN 0031-9007

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Official URL: http://prl.aps.org/abstract/PRL/v102/i6/e065901

Related URL: http://dx.doi.org/10.1103/PhysRevLett.102.065901

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.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:93764
Deposited On:25 Jun 2012 13:11
Last Modified:25 Jun 2012 13:11

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