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(a) Nafion surface view and (b) surface profile indicated by the horizontal line in (a) only; the first half of the indicated line is displayed. Observe a visible ∼50 nm periodicity indicated by horizontal arrows which corresponds to fiber pairs (2 × 25 nm). This periodicity is associated with the fiber transverse dimension (50 nm) and corresponds to fiber pair widths visible in (a). Adapted from ACS Omega2023,8, 51, and 49073–49079.
