Nanofluidics derived from low-dimensional nanosheets and protein nanochannels are crucial for advanced catalysis, sensing, and separation. However, polymer nanofluidics is halted by complicated preparation and miniaturized sizes. This work reports the bottom-up synthesis of modular nanofluidics by confined growth of ultrathin metal–organic frameworks (MOFs) in a polymer membrane consisting of zwitterionic dopamine nanoparticles (ZNPs). The confined growth of the MOFs on the ZNPs reduces the chain entanglement between the ZNPs, leading to stiff interfacial channels enhancing the nanofluidic transport of water molecules through the membrane. As such, the water permeability and solute selectivity of MOF@ZNPM are one magnitude improved, leading to a record-high performance among all polymer nanofiltration membranes. Both the experimental work and the molecular dynamics simulations confirm that the water transport is shifted from high-friction-resistance conventional viscous flow to ultrafast nanofluidic flow as a result of rigid and continuous nanochannels in MOF@ZNPM.

中文翻译：

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金属-有机骨架增强的超快水传输两性离子聚合物纳米流体膜

源自低维纳米片和蛋白质纳米通道的纳米流体对于高级催化、传感和分离至关重要。然而，聚合物纳米流体因复杂的制备和小型化而停滞不前。这项工作报告了通过在由两性离子多巴胺纳米粒子 (ZNP) 组成的聚合物膜中限制生长超薄金属有机框架 (MOF) 来自下而上合成模块化纳米流体。MOFs 在 ZNPs 上的受限生长减少了 ZNPs 之间的链缠结，导致刚性界面通道增强了水分子通过膜的纳米流体传输。因此，MOF@ZNPM 的水渗透性和溶质选择性提高了一个数量级，从而在所有聚合物纳滤膜中创造了创纪录的高性能。