| 초록 |
In this study, we prepared hierarchically porous SiCN ceramic nanofibers by electrospinning and pyrolysis using phenyl-silsesquiazane (SSQZ), which is a branched polysilazane. The SSQZ solution was mixed with high molecular weight poly(ethylene oxide) (PEO) to compensate its low viscosity. The addition of PEO not only improved the viscosity, but also generated the pores on the surface of nanofibers by nonsolvent-induced phase separation (NIPS), resulting in hierarchical structure. The morphology of nanofibers and pores were affected by nonsolvents as well as ratio of SSQZ and PEO. Also, the electrospun nanofibers were stably ceramized during pyrolysis at 700 ºC. The characterization of nanofibers was performed by field emission scanning electron microscopy and Fourier-transform infrared spectroscopy. The pore size and its distributions were confirmed by transmission electron microscopy and N2 adsorption isotherm analysis. |
