Membranes integrating two-dimensional (2D) materials have emerged as a category with unusual ion transport and potentially useful separation applications in both aqueous and nonaqueous systems. The interlayer galleries in these membranes drive separation and selectivity, with specific transport properties determined by the chemical and structural modifications within the inherently different interlayers. Here we report an approach to tuning interlayer spacing with a single source material─exfoliated and restacked vermiculite with alkanediamine cross-linkers─to both control the gallery height and enhance the membrane stability. The as-prepared cross-linked 2D vermiculite membranes exhibit ion diffusivities tuned by the length of the selected diamine molecule. The 2D nanochannels in these stabilized vermiculite membranes enable a systematic study of confined ionic transport.

中文翻译：

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独立蛭石膜的可调谐离子传输

集成二维 (2D) 材料的膜已成为一类具有不寻常的离子传输和在水性和非水性系统中潜在有用的分离应用的类别。这些膜中的夹层通道驱动分离和选择性，具有由固有不同夹层内的化学和结构修改决定的特定传输特性。在这里，我们报告了一种使用单一来源材料（用链烷二胺交联剂剥离和重新堆叠的蛭石）调整层间距的方法，以控制通道高度并增强膜稳定性。所制备的交联二维蛭石膜表现出由所选二胺分子的长度调节的离子扩散系数。