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ACS Appl Mater Interfaces. 2017 Sep 20;9(37):32237-32247. doi: 10.1021/acsami.7b08740. Epub 2017 Sep 11.

Anion-Responsive Poly(ionic liquid)s Gating Membranes with Tunable Hydrodynamic Permeability.

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College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University , Chengdu 610065, People's Republic of China.
National Engineering Research Center for Biomaterials, Sichuan University , Chengdu 610064, People's Republic of China.


Novel anion-responsive "intelligent" membranes with functional gates are fabricated by filling polyethersulfone microporous membranes with poly(ionic liquid)s (PILs) gels. The wetting properties of the PILs could be controlled by changing their counteranions (CAs), and thus, the filled PILs gel gates in the membrane pores could spontaneously switch from the "closed" state to the "open" one by recognizing the hydrophilic CAs in the environment and vice versa. As a result, the fluxes of the "intelligent" membranes could be tuned from a very low level (0 mL/m2·mmHg for Cl-, Br-, and BF4-) to a relatively high one (430 mL/m2·mmHg for TFSI). The anion-responsive gating behavior of the PILs filled membranes is fast, reversible, and reproducible. In addition, the "intelligent" membranes are sensitive to contact time and ion concentrations of the hydrophobic CA species. The proposed anion-responsive "intelligent" membranes are highly attractive for ion-recognizable chemical/biomedical separations and purifications.


anion-response; hydrodynamic permeability control; poly(ionic liquid)s; “intelligent” membranes


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