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- W3082007133 abstract "The microstructure of membranes (especially the grain size) has a considerable influence on their oxygen separation performance. Numerous studies focused on isotropic materials such as perovskites, while only a few investigated anisotropic K2NiF4-type materials due to their complex oxygen ion transport paths. In this work, a series of K2NiF4-type (Pr0.9La0.1)1.9Ni0.74Cu0.21Ga0.05O4+δ ((PL)1.9NCG) dense membranes, with a grain size of 8.2–166.4 μm2, were prepared by adjusting the sintering conditions. The oxygen permeation fluxes through the (PL)1.9NCG membranes displayed a unique concave curve as a function of the grain size, with an initial decrease when the grain size increased from 8.2–62.1 μm2, followed by an increase when the grain size exceeded the critical value (62.1 μm2). As the structure, density, and surface exchange rates of the (PL)1.9NCG membranes were found to alter slightly with the grain size, the differences in the oxygen permeability were deduced to be originating from the anisotropic bulk diffusion process. Therefore, adjusting the grain size is an effective strategy for enhancing the oxygen permeability of anisotropic membranes." @default.
- W3082007133 created "2020-09-08" @default.
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- W3082007133 date "2021-01-01" @default.
- W3082007133 modified "2023-09-27" @default.
- W3082007133 title "Reducing anisotropic effects on oxygen separation performance of K2NiF4-type membranes by adjusting grain size" @default.
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- W3082007133 doi "https://doi.org/10.1016/j.memsci.2020.118628" @default.
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