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Cross section of representative PS grooved fibers obtained from different concentrations. (A) 10% (w/v), (B) 15% (w/v), (C) 25% (w/v), and (D) 30% (w/v). THF/DMF ratio 1:1 v/v, RH 60%, collecting distance 15 cm, feeding rate 1.5 ml/h, applied voltage 12 kV.
