| http://www.w3.org/ns/prov#value | - Whether the cation exchange membrane according to the invention is grafted with a group of formula ???R1???(CH2)m???NR2R3 and/or with a molecule bearing at least such a group notably in the form of a polymeric structure, the thickness of the grafting i.e. the thickness of the thereby grafted layer is less than 100 nm, advantageously less than 80 nm, notably less than 60 nm and, in particular, comp
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