The process of adsorption and subsequent desorption of gases in porous materials often shows hysteretic behaviour. A combination of diffusion measurements and numerical modelling could now explain why.
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Stapf, S. How molecules huddle in holes. Nature Phys 2, 731–732 (2006). https://doi.org/10.1038/nphys441
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DOI: https://doi.org/10.1038/nphys441
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