期刊
SMALL
卷 16, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201903925
关键词
flux regulation; gating membrane; salt responsivity; zwitterionic nanohydrogels
类别
资金
- National Natural Science Funds for Distinguished Young Scholar [51625306]
- National Natural Science Foundation of China [51603229, 21406258]
- Key Project of National Natural Science Foundation of China [21433012]
- Joint Research Fund for Overseas Chinese, Hong Kong, and Macao Scholars [21728602]
- State Key Laboratory of Separation Membranes and Membrane Processes (Tianjin Polytechnic University) [M1-201801]
Highly sensitive responsiveness is vital for stimuli-responsive membranes. However, it is a great challenge to fabricate stimuli-responsive membranes with ultrahigh gating ratio (the ratio of the salt solution permeating flux to the pure water permeating flux) and high response speed simultaneously. In this work, a salt-responsive membrane with an ultrahigh gating ratio is fabricated via a facile strategy by grafting zwitterionic nanohydrogels onto a poly(acrylic acid)-grafting-poly(vinylidene fluoride) (PAA-g-PVDF) microporous membrane. Due to the synergistic effect of two functional materials, PAA chains and zwitterionic nanohydrogels tethered on PAA chains, this stimuli-responsive membrane exhibits an ultrasensitive salt responsiveness with a gating ratio of up to 8.76 times for Na+ ions, 89.6 times for Mg2+ ions, and 89.3 times for Ca2+ ions. In addition, such zwitterionic nanohydrogels-grafted PAA-g-PVDF (ZNG-g-PVDF) membranes exhibit very rapid responses to stimuli. The permeating flux changes swiftly while altering the feed solution in a continuous filtration process. The excellent salt-responsive characteristics endow such a ZNG-g-PVDF membrane with great potential for applications like drug delivery, water treatment, and sensors.
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