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| - Surface Self-Diffusion of Organic Molecules Adsorbed in Porous Silicon
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| - The pulsed field gradient nuclear magnetic resonance method has been employed to probe self-diffusion oforganic guest molecules adsorbed in porous silicon with a 3.6 nm pore size. The molecular self-diffusioncoefficient and intrapore adsorption were simultaneously measured as a function of the external vapor pressure.The latter was varied in a broad range to provide pore loading from less than monolayer surface coverage tofull pore saturation. The measured diffusivities are found to be well-correlated with the adsorption isotherms.At low molecular concentrations in the pores, corresponding to surface coverages of less than one monolayer,the self-diffusion coefficient strongly increases with increasing concentration. This observation is attributedto the occurrence of activated diffusion on a heterogeneous surface. Additional experiments in a broadtemperature range and using binary mixtures confirm this hypothesis.
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