Abstract Due to their narrow and well-defined structure, single wall nanotube, aluminosilicate nanotubes (imogolites) are excellent candidates to study how water is modified by either confinement or by the interface nature. A protocol is provided here to produce imogolite films that are ideally suited for infrared studies. Two types of imogolites were selected: a hydrophilic imogolite (IMO-OH) with inner surface fully covered with Si–OH hydrophilic groups and a hybrid imogolite (IMO-CH3) with inner surface fully covered with hydrophobic Si–CH3 groups. Films with different thicknesses were characterized by Small Angle X-ray Scattering (SAXS). The initial water content and the porosity of the films were estimated from ThermoGravimetric Analysis (TGA). Infrared spectroscopy was used to deduce the molar absorption coefficient of the bending mode that is significantly modified in confined water as compared to bulk water. Moreover, the interest of these films which allow avoiding extra-absorption features from the salt matrix or the supporting wafer is illustrated by an infrared study of the processes occurring in the IMO-OH film when it is heated from room temperature up to 350 °C. The evolution of the IR bands while heating shows the dehydration/dehydroxylation processes.

中文翻译：

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用于红外光谱的伊莫缨石和类伊莫缨石纳米管的自支撑薄膜

摘要 由于单壁纳米管、铝硅酸盐纳米管 (imogolites) 狭窄且结构明确，是研究水如何通过限制或界面性质进行改性的绝佳候选材料。这里提供了一个协议来生产非常适合红外研究的伊莫戈利特薄膜。选择了两种类型的伊莫缟石：内表面完全被 Si-OH 亲水基团覆盖的亲水伊莫缟石 (IMO-OH) 和内表面完全被疏水性 Si-CH3 基团覆盖的杂化伊莫缟石 (IMO-CH3)。具有不同厚度的薄膜通过小角 X 射线散射 (SAXS) 进行表征。薄膜的初始含水量和孔隙率由热重分析 (TGA) 估算。红外光谱用于推导弯曲模式的摩尔吸收系数，与散装水相比，该弯曲模式在承压水中显着改变。此外，通过对 IMO-OH 薄膜从室温加热到 350 °C 时发生的过程的红外研究，说明了这些薄膜的兴趣可以避免盐基质或支撑晶片的额外吸收特征. 加热时红外波段的演变显示了脱水/脱羟基过程。通过对 IMO-OH 薄膜从室温加热到 350 °C 时发生的过程的红外研究，说明了这些薄膜的兴趣可以避免盐基质或支撑晶片的额外吸收特征。加热时红外波段的演变显示了脱水/脱羟基过程。通过对 IMO-OH 薄膜从室温加热到 350 °C 时发生的过程的红外研究，说明了这些薄膜的兴趣可以避免盐基质或支撑晶片的额外吸收特征。加热时红外波段的演变显示了脱水/脱羟基过程。