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Quasi-stabilized hydration layers on muscovite mica under a thin water film grown from humid air

机译:在潮湿空气下形成的薄水膜下白云母云母上的拟稳定水化层

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摘要

The interfaces between solids and water films in air play fundamental roles in physicochemical phenomena, biological functions, and nano-fabrication. Though the properties of the interfaces have been considered to be irrelevant to the water film thickness, we found distinctive mechanical features of the interface between a cleaved muscovite mica surface and a thin water film grown in humid air, dissimilar to those in bulk water, using frequency-modulation atomic force microscopy. The thin water film grew with quasi-stabilized hydration networks of water molecules, tightly bound each other at the interface, to a thickness of ~2 nm at near-saturating humidity. Consequently, defective structures of the hydration networks persisted vertically through the hydration layers at the interface, and K+ ions on the cleaved surface remained without dissolution into the water film. The results provide atomistic insights into thin water films in regard to epitaxial-like growth from vapour and the motion of water molecules and ions therein.
机译:空气中固体与水膜之间的界面在物理化学现象,生物学功能和纳米制造中起着基本作用。尽管人们认为界面的性质与水膜的厚度无关,但我们发现,白云母云母表面与潮湿空气中生长的薄水膜之间的界面具有独特的机械特征,这与散装水不同。调频原子力显微镜。薄的水膜与准稳定的水分子水合网络一起生长,在界面处彼此紧密结合,在接近饱和的湿度下达到〜2 nm的厚度。因此,水合网络的有缺陷的结构通过界面处的水合层在垂直方向上持续存在,并且在裂解表面上的K + 离子残留而没有溶解到水膜中。该结果提供了关于水蒸气的外延样生长以及其中水分子和离子运动的水薄膜的原子学见解。

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