Gas sorption into the nanochannel water cage

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The gas handling apparatus was made to control relative humidity and pressure inside the pressure cell, which is equipped in our Fourier transformed infrared spectrometer. Employing the system, we tried the experiments on gas sorption of CO2, N2, Xe into the 14- and 18-sided cavities consisting of water molecules in the nanochannel. The appropriate relative humidity was determined to dehydrate the water molecules inside the water cage. In spite of infrared inactive molecular vibrations, noble infrared band due to the gas molecule hydrated in the water cage seems to appear, because charge polarization may be induced owing to strong hydrations and interfacial interactions. From the microwave conductivity and infrared spectra, we clarified that proton and protonic hole in the water network form an Eigen-type hydrate with a local distortion. The proton and protonic hole are generated by the self-dissociation of water molecules directly hydrogen bonded to the framework molecule.