LAUSR

The bubble electrospinning [1-3] is to replace a Taylor cone in classic electrospinning by a polymer bubble. The electrostatic force is to overcome the surface tension of the bubble, which will be broken into pieces when the electrostatic force is large enough, and each fragment has a high ejecting velocity of about 300 m/s, and it can be further accelerated by the electrostatic force. The electrostatic force is replaced by other external forces, such as centrifugal force, flowing air, various mechanical forces in the bubbfil spinning process [4, 5]. A rapid solvent evaporation occurs due to a sudden drop of air pressure at the nozzles when a polymer bubble is broken at nozzles, and flash evaporation is also widely adopted for fabrication of nanoporous fibers [6, 7], controlling the solution concentration and pressure drop and temperature are important to adjust its porosity and size of the fiber. In the spinning process, multiple solvents are used to control the spinning process and the fiber morphology as well. For a multi-solvent solution, it is important to calculate the amounts of flashed solvents.