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장덕례,조용준,허기석,Chang, Duk-Rye,Cho, Yong-Jun,Heo, Gi-Seok 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.5
PVdF-HFP nanofibers were fabricated by co-electrospinning technique. The fabricated PVdF-HFP nanofibers were characterized using scanning electron microscopy (SEM). We have evaluated systematically the effects of the most important processing parameters: voltage, solution concentration and tip to collector distance, on the morphology of the formed fibers. 7.5 wt%$\sim$20 wt% PVdF-HFP nanofibers of about 495 nm$\sim$2.26 $\mu$m in diameter were fabricated. The average diameter of PVdF-HFP nanofibers increased with increasing concentration of PVdF-HFP solution. It is found that the concentration of PVdF-HFP polymer solution strongly affects the size of the fibers so that diameter of fibers increases with increasing concentration of the solution. Also the applied voltage is strongly correlated with the distribution of nanofibers. In addition, we found an evidence that electrostatic effects influence the stability of discharge.
장덕례,정은영,김호성,Chang, Duk-Rye,Jeong, Eun-Young,Kim, Ho-Sung 한국재료학회 2007 한국재료학회지 Vol.17 No.5
Polyacrylonitrile nanofibers were fabricated by co-electrospinning technique and were characterized using scanning electron microscopy(SEM). We have evaluated systematically the effects of the important processing parameters affected on the morphology of the formed fibers; voltage, solution concentration and tip to collector distance. PAN nanofibers of about 200 nm${\sim}$2500 nm in diameter were well fabricated at the polymer concentration of 7.5 wt%${\sim}$15 wt%. It has been found that the average diameter of PAN nanofibers increased with increasing the concentration of PAN solution due to the reduction of whipping and splitting for the high viscosity solution. we also found an evidence that the applied voltage is strongly correlated with the distribution of nanofibers and the uniformed size of nanofibers were obtained at electrostatic value of 1 kV/cm.