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Lookup NU author(s): Maria Kazakli, Dr Greg MutchORCiD, Dr Georgios TriantafyllouORCiD, Professor Ian Metcalfe
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).
High temperature ceramic membranes often suffer catastrophic failure and loss of selectivity due to the initiation and propagation of cracks, leading to the creation of leak paths for undesired permeants. Cracking occurs due to the brittle nature of ceramics and e.g. materials expansivity mismatch or stresses accumulated at sealing points. One way to overcome this problem is to produce a self-healing membrane, where the healing phase restores perm-selectivity to the membrane following cracking. Here we show that the molten salt in a supported molten-salt membrane for CO2 permeation can be used to self-heal a working membrane in operation, all the while being the selective phase for permeation. By designing a membrane with a sacrificial crack-inducing agent (removed to create a clear leak-path) we show in a single experiment how a permeating membrane can crack and leak, then autonomously self-heal via an intrinsic mechanism; controlled spreading of the highly-wetting and CO2 selective molten salt. No external triggers or self-healing stimuli are required, indicating that highly-wetting and selective liquids can be used to increase membrane lifetime by self-healing, reducing capital and operating costs.
Author(s): Kazakli M, Mutch GA, Qu L, Triantafyllou G, Metcalfe IS
Publication type: Article
Publication status: Published
Journal: Journal of Membrane Science
Year: 2020
Volume: 600
Print publication date: 15/04/2020
Online publication date: 21/01/2020
Acceptance date: 16/01/2020
Date deposited: 22/01/2020
ISSN (print): 0376-7388
ISSN (electronic): 1873-3123
Publisher: Elsevier BV
URL: https://doi.org/10.1016/j.memsci.2020.117855
DOI: 10.1016/j.memsci.2020.117855
Data Access Statement: https://doi.org/10.25405/data.ncl.9610601.v1
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