Preparation And Research Of TiO₂/PAN-based Activated Carbon Nanofiber

Electrospinning is a new and great potential development spinning technology. Different from other gengeration one-dimensional nanomaterials, Electrospinning is based on the principle that high-voltage electrostatic field conductive fluids under high-speed jet. Electrospinning occurs when the electrical forces at the surface of a polymer solution or melt overcome the surface tension and cause an electrically charged jet to be ejected. When the jet dries or solidified, an electrically charged fiber remains. This charged fiber can be directed or accelerated by electrical forces and then collected in mats or other useful geometrical forms. The diameters of electrospun fibers are in the range of tens of nanometers to several micrometers.This thesis systematically studied the influences of solution concentration, spinning voltage and solution ratio on the electropinning process and the morphology of electrospun fibers by using TiO₂, PAN and DMF as fiber-forming materials. The results showed: solution concentration and voltage have a direct impact on spinning fiber fineness and spinnability, while the proportion was appropriate, bearing fiber can play the role. Additionally, the collection on a rotating cylinder is not only helpful to the process of electrospinning, but also roller collection enable fiber parallel to the fiber tensile oriented role.On this ground, the fiber were handed with preoxidation, carbonization and the fiber crystallographic form and structural transformation were researched. In preoxidation process, the PAN molecule gradually formed cyclized structure system and TiO₂ improved from amorphism to anatase. Due to drawing orientation, the neat collection, strength and glossiness of fiber received by roller were far better than these of fiber received by plate. At last, with H3PO4 as the activating agent, the PAN-ACF/TiO₂ nanofiber was obtained when calcined in nitrogen at 600°C...