13C NMR spectra. The cage occupancies of the small and large cages of the hydrates were estimated from the 13 C NMR spectra on the basis of a statistical thermodynamic model. The large cages were almost fully occupied with guest molecules, whereas small cage occupancy decreased with increasing C2H6 concentration. Therefore, large cages are highly preferentially occupied by C2H6 molecules rather than CH4 molecules.
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