期刊
NANO RESEARCH
卷 13, 期 11, 页码 2973-2978出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-2959-6
关键词
metal-organic framework (MOF) nanosheet membrane; thermo-responsiveness; molecular separation; infrared (IR) spectroscopy
类别
资金
- National Natural Science Foundation of China [21991123, 51733003, 21674025, 51873035]
- Qimingxing project of the Shanghai Committee of Science and Technology [19QA1400200]
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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