전기방사 시스템을 이용한 유-무기 복합 나노섬유 제조에 관한 연구

Abstract

Carbon nanotube (CNT)/Silica (SiO2) composite nanofibers were fabricated by electrospinning and then treated by calcination. To obtain CNT/SiO2 composite nanofibers, functionalized CNTs (fCNTs) were prepared by chemical oxidation and mixed with tetraethyl orthosilicate:H2O:H3PO4:poly(vinyl alcohol) solutions. The resulting solutions were electrospun under adjusted parameters and the properties of the composite nanofiber solution were measured. The dispersity and direction of CNTs in the composite nanofibers were also monitored. By using fCNTs, the CNTs were well dispersed in CNT/SiO2 composite nanofibers by improving the dispersity of CNTs in the TEOS sol-gel/PVA solution. fCNTs can therefore be used to enhance the dispersity and direction of CNTs in SiO2 composite nanofibers prepared by electrospinning. Silica (SiO2) composite nanofibers containing a different amount of polystyrene (PS) nanoparticles were fabricated via electrospinning with PVA as a binder. PS nanoparticles were prepared by emulsion polymerization. Then PS nanoparticles were mixed with a TEOS/Ethanol/H2O/H3PO4/PVA solution. The spinning solution which was obtained was electrospun under different electrospinning parameters. It was suggested that the amount of ethanol in the spinning solution was a critical factor to determine the morphology of the nanofibers. Because the amount of ethanol affected the viscosity and the electric conductivity of the spinning solution. In addition, porous SiO2 nanofibers were prepared by the removal of the PS nanoparticles and PVA from PS nanoparticle/SiO2/PVA composite nanofibers by calcination. CNT/SiO2 composite nanofibers, PS nanoparticles/SiO2/PVA composite nanofibers and SiO2 porous nanofibers containing macro- and meso-pores were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier Transform Infrared Spectroscopy, and thermogravimetric analysis.