Preparation And Application Of Compiosite Nanofibers By Electrospinning

Electrospinning technique which uses high-strength electric field to transfer melt or solution of polymer into ultra fine fibers is the most widely used method of preparation nanofibers,currently. And it has been widely used in biomedical field, tissue engineering, sensor, membranes and other fields, owing to its simple operation, and quick, substantial, continuous preparation of micro-nanofibers.Firstly, this thesis introduces the origin and development of electrospinning, and analysis the current research, and summarizes the preparation and application of electrospinning, including applied in electrochemical sensors, biomedicine, photocatalytic degradation. Secondly, three kinds of composite nanofibers were prepared by electrospinning, and the morphology, properties and performances of the nanofibers were also studied. The details are as follows:1. Prepared PB nanoparticles in chemical method, then dissolved the proportions of PB and PVDF into DMAC and acetone for preparing spinning solution, got porous PB/PVDF composite nanofibers through electrospinning technology and characterized by SEM, UV-Vis, FT-IR, XRD,TGA for PB nanoparticles and nanofibers. Then the composite nanofibers were applied to modify conductive glass for building sensor to detecte ascorbic acid(AA). The results showed that the PB/PVDF composite nanofibers not only has good electrical conductivity, but also has a good respons to AA, and the composite nanofibers also can improve stability of PB in neutral and alkaline environment.2. Using PVP as protection agent, DMF as solvent and reducing agent to reduce nitrater silver(Ag NO3) for preparing Ag nanoparticles, and added the proportions of PVDF for preparing spinning solution. Subsequently, we will get Ag/PVP/PVDF composite nanofibers by electrospinning. At last, the Ag nanoparticles and the composite nanofibers were characterized by SEM, XRD, FT-IR, UV-Vis, TG. Then, the composite nanofibers were applied to bacteriostasis experiment for studying antibacterial properties. The results suggest that Ag/PVP/PVDF composite nanofibers has excellent antibacterial effection, stabilization, and easy to be recycled.3. The Zn(CH3COO)2/PVP composite nanofibers were obtained through electrospinning, and calcined during high temperatureand, the Zn O nanofibers would be achieved. Subsequently, coated In2S3 nanosheets by hydrothermal method for preparing Zn O/In2S3 composite nanofibers. Then the nanofibers were characterized by SEM, XRD, TG, EDS, UV-Vis DRS. Finally, the property ofZn O/In2S3 composite nanofibers degradating Rhodamine B and K2Cr2O7 in visible light was studied. The research achievement shows that Zn O/In2S3 composite nanofibers are good at photocatalytic degradation of organic contaminants and heavy metal ions under visible light.