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The diffusion path reversibility confirms symmetry of surface barriersSastre, German, Kärger, Jörg, Ruthven, Douglas M. 05 March 2020 (has links)
The resistance perceived by guest molecules upon entering or leaving a microporous host material (the
“surface barrier”) is known to often surpass the influence of diffusion in its interior on the overall rate
of molecular uptake and release [1, 2]. Our knowledge of the relevant mechanisms of surface
permeation, however, is still rather limited. This is related to the difficulties in its direct measurement
which, given the “nanoscopic” extension of the relevant space scale, notably exceed the difficulties
which do exist with already the diffusion measurement. A question discussed in this context refers to
the possibility that the resistance perceived by the molecules on entering the pore space may differ from
that perceived upon leaving [3-5].
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