coaxial spinnerete를 이용한 중공나노섬유 제조

2015-10-06 02:23

Figure 1 (A) Schematic illustration of the setup for electrospinning nanofibers having a core/sheath structure. The spinneret was fabricated from two coaxial capillaries, through which heavy mineral oil and an ethanol solution containing PVP and Ti(OiPr)4 were simultaneously ejected to form a continuous, coaxial jet. (B) TEM image of two as-spun hollow fibers after the oily cores had been extracted with octane. The walls of these tubes were made of a composite containing amorphous TiO2 and PVP. (C) TEM image of TiO2 (anatase) hollow fibers that were obtained by calcining the composite nanotubes in air at 500 deg.gifC. (D) SEM image of a uniaxially aligned array of anatase hollow fibers that were collected across the gap between a pair of electrodes. These fibers were fractured using a razor blade to expose their cross-sections. In the preparation of all these samples, the feeding rate for heavy mineral oil was 0.1 mL/h and the concentrations of Ti(OiPr)4 and PVP were 0.3 and 0.03 g/mL, respectively. The voltage of electrospinning was 12 kV.


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