Fig. 1 Synthesis of ZIF-8 membranes and the difference between ZIF-8_I and ZIF-8_Cm for propene/propane separation. Synthesis of ZIF-8 membranes and the.

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Presentation transcript:

Fig. 1 Synthesis of ZIF-8 membranes and the difference between ZIF-8_I and ZIF-8_Cm for propene/propane separation. Synthesis of ZIF-8 membranes and the difference between ZIF-8_I and ZIF-8_Cm for propene/propane separation. (A) The electrochemical cell for membrane growth by FCDS. The substrate serves as a cathode in the electrochemcial system. (B) Schematic illustration of the ZIF-8 membrane growth via FCDS in comparison with solvothermal growth. In the solvothermal route, zinc ions and linkers assemble into the normal ZIF-8_I phase. With the local in situ electric field that formed around the support by the current, inborn lattice distortion occurs and the stiff polymorph ZIF-8_Cm is formed. (C to H) Schematic illustration and SEM images during ZIF-8 layer formation. Scale bars, 200 nm. (I) Difference between ZIF-8_I and ZIF-8_Cm for C3H6/C3H8 separation. Because the linkers of ZIF-8_I are easier to rotate than those of ZIF-8_Cm, during C3H6/C3H8 separation, the bigger propane molecules can permeate through the ZIF-8_I apertures more easily than through the ZIF-8_Cm apertures. Consequently, ZIF-8_Cm polymorph is expected to be more efficient for propene sieving. Sheng Zhou et al. Sci Adv 2018;4:eaau1393 Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).