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A basic series electrospinning unit (Nanolab, Malaysia) was employed to prepare electrospun fibers. The polymer solution was placed in a 10-mL plastic syringe (Luer Lock Solo syringe, B Braun, Germany) pumped at a speed of 0.7 mL/h for electrospinning of TE-loaded fibers or 1.2 mL/h for electrospinning of TE-free fibers. The inner diameter of a blunt needle fixed on the syringe was 0.8 mm. A rotating drum collector was located 10 cm from the needle tip, covered with aluminum foil for deposition of fibers. Its rotation speed was adjusted to 1000 rpm. The voltage between the needle and the collector was set at 9 kV for TE-loaded fibers or 11 kV for TE-free fibers. The electrospinning experiments were performed at room temperature.

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