Figure 7

SEM images of spun fibers of N-R₇-C. Scale bars show 250 μM (a), 25 μm (b) 10 μm (c). Surface striations are observed at high magnification in some cases (b), but not others (c). The fiber shown in panel (c) represents a second batch of fibers, spun on a separate occasion to the fibers shown in (a) and (b).