| Summary: | 碩士 === 國立臺南大學 === 材料科學系碩士班 === 96 === In this study, silica nanofibers were synthesized by electrospinning and Sol-Gel process. A viscous solution of [poly(vinyl butyral) (PVB)] was used into the silica precursor, followed by heat treatment temperature at 500oC to obtain silica nanofibers. SEM images show their morphology and fibers diameter about 120-190nm. XRD patterns of the silica nanofibers exhibits the characteristics of amorphous after heat treatment. The properties of silica nanofibers produces depend on many process variables including the nanofiber precursor viscosity, the needle inner diameter, the magnitude of the applied voltage and volume feed rate, and the work distance between the needle and the collector. We measured the viscosity of our electrospinning solutions , a viscosity are spinning in the range of 25-35 cP works well. Finally a cetyl trimethyl-ammonium bromide(CTAB) was employed to prepare silica rodlike-nanofibers. The result indicated the best processing parameters to electrospinning including the smallest available needle of inner diameter of 0.16 mm; low volume feed rate of 0.1 ml/h; applied voltage of 12 kV and tip collector distance of 10 cm, excellent results were achieved. Both of nanofibers and nanorods were characterized by SEM and BET. The silica nanofibers had an average diameter about 80-110 nm, the pore diameter about 2.33-3.09nm, total pore volume were 0.19-0.23cm3/g and have high specific surface area were 259-338 m2/g.
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