Criterion for an oscillatory charged jet during the bubble spinning process

The oscillatory diameter of the charged jet during bubble electrospinning results in beads on the obtained nanobers. We demonstrate that the applied voltage and the initial ow rate of the jet are crucial parameters necessary to control the morphology of the nanobers. We also nd that there is a criterion for the production of smooth nanobers without beads. The theory developed in this paper can be extended to classical electrospinning and blown bubble-spinning.