“…For example, PB shows permeability in the order of K + > Na + > Li + , similarly to the order of the radii of hydrated ions of Li + , Na + and K + whose values are 0.12, 0.18 and 0.235 nm [52], respectively. Gao et al [53] reported a permeability order of K + > Na + > Li + for CoHCF; our previous results also indicated that the permeability of CoHCF is K + > Na + > Li + [10,11]. Engel and Grabner [54] reported the permeability order of CuHCF as K + > Na + , Kulesza and Faszynska [55] and Dong and Jin [56] showed that the permeability order of InHCF is also K + > Na + .…”