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Cross section of representative fibers. The fibers were fabricated by electrospinning 20% (w/v) PS solutions with various THF/DMF ratios. (A, B) 4:1, (C, D) 1:1, and (E, F) 0:6 v/v. RH 60%, collecting distance 15 cm, feeding rate 1.5 ml/h, and applied voltage 12 kV.
