TY - JOUR
T1 - Assessing guest diffusivities in porous hosts from transient concentration profiles
AU - Heinke, Lars
AU - Tzoulaki, Despina
AU - Chmelik, Christian
AU - Hibbe, Florian
AU - Van Baten, Jasper M.
AU - Lim, Hyuna
AU - Li, Jing
AU - Krishna, Rajamani
AU - Kärger, Jörg
PY - 2009/2/11
Y1 - 2009/2/11
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.102.065901
DO - 10.1103/PhysRevLett.102.065901
M3 - Article
AN - SCOPUS:61349132957
VL - 102
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 6
M1 - 065901
ER -