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In recent years, the electrospinning method has been studied extensively. However, there is a disadvantage with respect to the amount of solvent being used for producing nanofibers; most of the solvent will be evaporated into the atmosphere leading to a very earth-unfriendly situation. In this study, we attempt to spin nanofibers/microfibers without using solvents in question; alternatively, physical centrifugal force is used. For that purpose, a new experimental device has been designed and fabricated. As the material spun, we chose polypropylene (PP), which was heated by a rotating disk via an induction heater (IH) and sprayed out from a microsize nozzle onto the disk rotated by centrifugal force. PP fibers are formed when molten PP is released from the nozzle while being simultaneously cooled by air. Fabricated PP fibers are observed by scanning electron microscopy (SEM). The maximum relative centrifugal force of a rotating disk was 67000 G in a previous report in which a belt driving system was employed [Z. Shichang and H. Noguchi: Proceedings of Seikei-Kakou Annual Meeting (2012) 181]. In the present work, the rotation speed of the disk is increased by a gear driving system, in which the centrifugal force of the rotating disk is increased to 1 G, for the centrifugal melt spinning equipment. Eventually, we applied the present nanofiber/microfibers as a good material for fabricating thin filters for collecting, sensing, and subsequent evaluation of the characteristics of PM2.5 generated in the exhaust gas of gasoline-fueled automobiles because of their superior resistance to various chemicals.

sensors and materials

Study on Nanofiber Spinning Using Centrifugal Force - Rotational Speed of Spinning Disk vs Nanofiber/Microfiber Diameter when Disk Speed is Increased via Gears -