Two-dimensional nanosheet membranes with responsive nanochannels are appealing for controlled mass transfer/separation, but limited by everchanging thicknesses arising from unstable interfaces. Herein, an interfacially stable, thermo-responsive nanosheet membrane is assembled from twin-chain stabilized metal-organic framework (MOF) nanosheets, which function via two cyclic amide-bearing polymers, thermo-responsive poly(N-vinyl caprolactam) (PVCL) for adjusting channel size, and non-responsive polyvinylpyrrolidone for supporting constant interlayer distance. Owing to the microporosity of MOF nanosheets and controllable interface wettability, the hybrid membrane demonstrates both superior separation performance and stable thermo-responsiveness. Scattering and correlation spectroscopic analyses further corroborate the respective roles of the two polymers and reveal the microenvironment changes of nanochannels are motivated by the dehydration of PVCL chains.

具有响应性纳米通道的二维纳米片膜对于受控的质量转移/分离具有吸引力，但受到不稳定界面引起的厚度变化的限制。本文中，界面稳定的热响应纳米片膜是由双链稳定的金属有机骨架（MOF）纳米片组装而成的，它通过两种带有环状酰胺的聚合物，热响应性聚（N-乙烯基己内酰胺）（PVCL）起作用用于调节通道尺寸，无响应聚乙烯吡咯烷酮用于支持恒定的层间距离。由于MOF纳米片的微孔性和可控制的界面润湿性，该杂化膜显示出优异的分离性能和稳定的热响应性。