Fig. 4.
SEM images of cross-sections of co-ES fiber bundles produced at different combinations of core flow rate-production time. (a–c) 0.8 mL/h — 0.5 h, 1 h, 2 h; (d–f) 1.0 mL/h — 0.5 h, 1 h, 2 h; (g–i) 1.4 mL/h — 0.5 h, 1 h, 2 h.
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