We demonstrate hydrogen‐bonded structures of water in self‐organized subnanoporous water treatment membranes obtained using synchrotron‐based high‐resolution soft X‐ray emission spectroscopy. The ion selectivity of these water treatment membranes is usually understood by the size compatibility of nanochannels in the membrane with the Stokes radius of hydrated ions, or by electrostatic interaction between charges inside the nanochannels and such ions. However, based on a comparison between the hydrogen‐bonded structures of water molecules in the nanochannels of the water treatment membrane and those surrounding the ions, we propose a definite contribution of structural consistency among the associated hydrogen‐bonded water molecules to the ion selectivity. Our observation delivers a novel concept to the design of water treatment membranes where water molecules in the nanochannel can be regarded as a part of the material that controls the ion selectivity.

中文翻译：

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亚纳米孔液晶水处理膜中水分子的离子选择性：氢键的结构研究

我们展示了使用基于同步加速器的高分辨率软 X 射线发射光谱获得的自组织亚纳米孔水处理膜中水的氢键结构。这些水处理膜的离子选择性通常通过膜中纳米通道的尺寸与水合离子的斯托克斯半径的兼容性来理解，或者通过纳米通道内的电荷与此类离子之间的静电相互作用来理解。然而，基于水处理膜纳米通道中水分子的氢键结构与离子周围水分子的氢键结构之间的比较，我们提出相关氢键水分子之间的结构一致性对离子选择性的明确贡献。我们的观察为水处理膜的设计提供了一个新颖的概念，其中纳米通道中的水分子可以被视为控制离子选择性的材料的一部分。