Preparation And Characterization Of PVP/α-Fe₂O₃ Composite Nanofibers

Electrospinning technology currently caused widespread concern around the world. Fibers prepared by electrospinning technique have advantages of large specific surface areas, high prosities, etc. Nanoα-Fe₂O₃ with high surface activity, good lightfastness, magnetic properties and good absorption of UV radiation and shielding effect, therefore, which can be widely used as the main component of a good soft magnet material and have a strong sensitivity, can be used for targeted drug delivery in medicine; and have broad applications in many areas such as in fine ceramics, catalysis, filter, light absorption, anti-corrosion and photographic materials. If compositingα-Fe₂O₃ nanoparticles and polymer PVP so as to combine the advantages ofα-Fe₂O₃ nanoparticles and polymer PVP, so that synthesis composite materials with material characteristics ofα-Fe₂O₃ nanoparticles and polymers. In this paper, we preparedα-Fe₂O₃ nanoparticles and PVP/α-Fe₂O₃ composite nanofiber materials by sol-gel method (Sol-Gel) and electrospinning technique. The specific conclusions of this study are as follows:1.α-Fe₂O₃ was fabricated by sol-gel process successfully, the morphology and structure of the products were characterized by many means. Study found that calcination temperature had a great impact on the formation and morphology ofα-Fe₂O₃. With increasing the temperature, the preparedα-Fe₂O₃ changed from smaller particle size and nonuniform state to bigger particle size and uniform state. When the temperature was 5500C, the particle size increased, and the obtained products were basically transformed into homogeneous single-phaseα-Fe₂O₃ by X-ray diffraction (XRD) analysis.2. PVP/α-Fe₂O₃ composite nanofiber materials were prepared by sol-gel method and electrospinning technique, the morphology and structure of the products were characterized by many means. The study found that PVP/α-Fe₂O₃ composite nanofibers have relatively smooth surface, uniform diameters, which showed thatα-Fe₂O₃ were effectively wrapped in composite nanofibers and had better dispersions. And by thermogravimetric analysis(TGA), the results showed that the organic component(PVP) of PVP/α-Fe₂O₃composite nanofibers whose initial decomposition temperature was lower than that of pure PVP fibers, which showed that PVP had interactions withα-Fe₂O₃, resulting in decomposition temperature of the PVP was lowed.