Bioinspired graphene membrane with temperature tunable channels for water gating and molecular separation

Jingchong Liu, Nü Wang (), Li-Juan Yu, Amir Karton, Wen Li, Weixia Zhang, Fengyun Guo, Lanlan Hou, Qunfeng Cheng, Lei Jiang, David A. Weitz and Yong Zhao ()
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Jingchong Liu: Beihang University
Nü Wang: Beihang University
Li-Juan Yu: The University of Western Australia, 35 Stirling Highway Crawley
Amir Karton: The University of Western Australia, 35 Stirling Highway Crawley
Wen Li: Shanghai University, Nanchen Street 333
Weixia Zhang: Harvard University, Cambridge
Fengyun Guo: Beihang University
Lanlan Hou: Beihang University
Qunfeng Cheng: Beihang University
Lei Jiang: Beihang University
David A. Weitz: Harvard University, Cambridge
Yong Zhao: Beihang University

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract 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.

Date: 2017
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DOI: 10.1038/s41467-017-02198-5

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