Two‐dimensional (2D) nanosheets‐based membranes, which have controlled 2D nano‐confined channels, are highly desirable for molecular/ionic sieving and confined reactions. However, it is still difficult to develop an efficient method to prepare large‐area membranes with high stability, high orientation, and accurately adjustable interlayer spacing. Here, we present a strategy to produce metal ion cross‐linked membranes with precisely controlled 2D nano‐confined channels and high stability in different solutions using superspreading shear‐flow‐induced assembly strategy. For example, membranes based on graphene oxide (GO) exhibit interlayer spacing ranging from 8.0 ± 0.1 Å to 10.3 ± 0.2 Å, with a precision of down to 1 Å. At the same time, the value of the orientation order parameter (f) of GO membranes is up to 0.95 and GO membranes exhibit superb stability in different solutions. The strategy we present, which can be generalized to the preparation of 2D nano‐confined channels based on a variety of 2D materials, will expand the application scope and provide better performances of membranes.

中文翻译：

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具有精确控制纳米限制通道的大面积分层膜


基于二维 (2D) 纳米片的膜具有受控的 2D 纳米限制通道，非常适合分子/离子筛分和限制反应。然而，开发一种有效的方法来制备高稳定性、高取向性和精确可调的层间距的大面积膜仍然很困难。在这里，我们提出了一种策略，使用超级扩散剪切流诱导组装策略，生产具有精确控制的二维纳米限制通道和在不同溶液中具有高稳定性的金属离子交联膜。例如，基于氧化石墨烯 (GO) 的膜的层间距范围为 8.0 ± 0.1 Å 至 10.3 ± 0.2 Å，精度低至 1 Å。同时，GO膜的取向序参数（f）值高达0.95，GO膜在不同溶液中表现出极好的稳定性。我们提出的策略可以推广到基于各种二维材料的二维纳米受限通道的制备，将扩大应用范围并提供更好的膜性能。