Single-bubble Electrospinning Unit

The structural diagram of a single-bubble electrospinning unit is shown in Fig. 6.7. Bubbles are formed on the mouth of the nozzle during the experimental process, and the forces on the charged bubbles are the electric field force (Fe), the force caused by the difference in air pressure inside and outside of the bubbles (Fp), and the surface tension of the bubbles (Ft) after voltage application. The bubble film composed of the spinning solution is drawn and then ruptured into multijets when the electric field force exceeds Fp and Ft. Finally, the multijets are stretched into nanofibers via the electric force. Bubbles can be continually formed on the mouth of the nozzle, and each bubble bursts to form high-speed multiple jets. The squirting speed of the air is controlled to increase nanofiber yield. The nanofiber yield is as high as 2.352 g/h, which is far greater than the yield achieved by conventional single-needle production.