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tuning the properties of confined water in standard and lybrid nanotubes： An infrared spectroscopic study

Nano Research 2018年第9期11卷 4759-4773页

作者： Yuanyuan Liao Pierre Picot Maxime Laine Jean-Blaise Brubach Pascale Roy Antoine Thill Sophie Le Caer LIONS NIMBE UMR 3685 CEA CNRS Universite Paris-Saclay CEA Saclay Bt. 546 F-91191 Gif-sur-Yvette Cedex France Synchrotron SOLEIL AILES Beamline L'Orme des Mefisier Saint-Aubin BP 48 F-91192 Gif-sur-Yvette Cedex France

imogolite is a natural nanotubular aluminum silicate clay mineral found in volcanic soils. Its well-defined, tunable structure makes it a good candidate for studying water confinement in a one-dimensional （1D） structure. Water confinement in self-sustaining imogolite thin films was studied using infrared spectroscopy. Two types of synthetic imogolites were investigated： pristine imogolite （IMO-OH） with a hydrophilic inner surface covered with Si-OH groups and hybrid imogolite （IMO-CH3） with a hydrophobic inner surface covered with Si-CH3 groups. Both imogolites have an outer surface that is covered with Al-OH groups. Infrared spectra were recorded in the 20-4,000 cm^-1 spectral range as a function of relative humidity. Analysis of the O-H stretching band provides information on the H bonding of confined water molecules inside and outside the IMO-OH tubes. The scenario for water filling as a function of relative humidity is determined for both systems. Adsorption begins in the IMO-OH tubes at the lowest relative humidity （〈 10%）. The inner surface of the tubes is first covered with water molecules; then, the central part of the tubes is filled, leading to very strong H bonds and a structured spectrum. In contrast, the H bonds of water adsorbed on the outer surfaces of these tubes are weaker. A different scenario is observed for water inside IMO-CH3： Weakly H-bonded water molecules are present, similar to that observed in carbon nanotubes. Water confinement in imogolites is governed by the hydrophilicity of the inner walls. At similar partial pressures, the degree of H bonding depends on the interactions between water and the nanotube wall.

关键词： imogolite nanotubes confinement infrared spectroscopy water isotherms hydrophilic hydrophobic

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