Abstract
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.
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Acknowledgements
The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Nos. 21991123, 51733003, 21674025, and 51873035), and “Qimingxing” project (No. 19QA1400200) of the Shanghai Committee of Science and Technology. The authors also thank the staff from BL16B Beamline at the Shanghai Synchrotron Radiation Facility for the assistance during data collection.
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Interfacially stable MOF nanosheet membrane with tailored nanochannels for ultrafast and thermo-responsive nanofiltration
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Jia, W., Wu, B., Sun, S. et al. Interfacially stable MOF nanosheet membrane with tailored nanochannels for ultrafast and thermo-responsive nanofiltration. Nano Res. 13, 2973–2978 (2020). https://doi.org/10.1007/s12274-020-2959-6
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DOI: https://doi.org/10.1007/s12274-020-2959-6