Hong Byungpyo, Jung Hyemin, Byun Hongsik
Department of Chemical System Engineering, Keimyung University, Daegu 704-701, Korea.
J Nanosci Nanotechnol. 2013 Sep;13(9):6269-74. doi: 10.1166/jnn.2013.7719.
Polyvinylidene fluoride (PVdF) (Kynar 761) nanofibers were prepared by electrospinning at an external voltage of 6-10 kV, a traveling distance of 7-15 cm and flow rate of 0.4-1 ml/hr. Although the diameter of the fiber was not significantly changed, the electrospinning conditions affected the overall distribution of diameter. This is probably due to the interactions, both attraction and repulsion, of positive charges on polymer solutions and the electrically grounded collector. Especially, the effect of voltage on the distribution of diameter was investigated in this study. The final PVdF nanofiber membrane showed narrow pore-size distribution and high water flux compared with the commercial MF membrane. PVdF nanofiber membranes incorporated nanosilver or graphene oxide were also prepared as nanosilver and graphene have an antibacterial activity. It was found that more than 200 ppm of silver nanoparticles in the PVdF nanofiber had 99.9% of growth inhibition of Staphylococcus aureus and Klebsiella pneumonia. It was also found that 0.2 wt% of graphene oxide in the PVdF electrospinning solution had 99.6% of disinfection property to E-Coli.
聚偏氟乙烯（PVdF）（Kynar 761）纳米纤维通过静电纺丝制备，外部电压为6 - 10 kV，行进距离为7 - 15 cm，流速为0.4 - 1 ml/小时。尽管纤维直径没有显著变化，但静电纺丝条件影响了直径的整体分布。这可能是由于聚合物溶液上的正电荷与接地收集器之间存在吸引和排斥的相互作用。特别是，本研究考察了电压对直径分布的影响。与商用微滤膜相比，最终的PVdF纳米纤维膜显示出窄的孔径分布和高的水通量。还制备了掺入纳米银或氧化石墨烯的PVdF纳米纤维膜，因为纳米银和氧化石墨烯具有抗菌活性。研究发现，PVdF纳米纤维中银纳米颗粒含量超过200 ppm时，对金黄色葡萄球菌和肺炎克雷伯菌的生长抑制率达99.9%。还发现，PVdF静电纺丝溶液中0.2 wt%的氧化石墨烯对大肠杆菌具有99.6%的消毒性能。
