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Liu, Jingchong; Wang, Nü; Yu, Li-Juan; Karton, Amir; Li, Wen; Zhang, Weixia; Guo, Fengyun; Hou, Lanlan; Cheng, Qunfeng; Jiang, Lei; Weitz, David A; Zhao, Yong
Nature communications, 12/2017, Volume: 8, Issue: 1Journal Article
Smart regulation of substance permeability through porous membranes is highly desirable for membrane applications. Inspired by the stomatal closure feature of plant leaves at relatively high temperature, here we report a nano-gating membrane with a negative temperature-response coefficient that is capable of tunable water gating and precise small molecule separation. The membrane is composed of poly(N-isopropylacrylamide) covalently bound to graphene oxide via free-radical polymerization. By virtue of the temperature tunable lamellar spaces of the graphene oxide nanosheets, the water permeance of the membrane could be reversibly regulated with a high gating ratio. Moreover, the space tunability endows the membrane with the capability of gradually separating multiple molecules of different sizes. This nano-gating membrane expands the scope of temperature-responsive membranes and has great potential applications in smart gating systems and molecular separation.
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