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An anomalous transport effect has been found by neutron spin echo measurements on n-alkanes diffusing in a small-pore zeolite: the diffusivity decreases from C1 to C8, but rises for C10 and has a maximum at C12, then decreases again. This confirms the existence of the “window effect” proposed thirty years ago by Gorring. The picture shows schematically how one end of a C12 chain extends through a zeolite window, lowering the barrier to diffusion.
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Jobic et al. (2003) studied this question.
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