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SEM images of co-ES fiber strips using various translation speeds of (a) 0.2 mm/s; (b) 0.5 mm/s; (c) 1 mm/s; (d) 3 mm/s; and (e) 5 mm/s at the core flow rate of 0.8 mL/h; (f) cross-sectional porosity; (g) a 30 mm wide fiber strip produced using 0.5 mm/s and 12 h; (h) a 15 mm wide strip produced using 0.5 mm/s and 6 h.
