ABSTRACT
The physical principles of electrospinning are based on the Taylor examination, related to a specific problem of fluid mechanics. This chapter discusses the basics of electrospinning process of polymer nanofibers. A thin skin consisting of nearly pure polymer forms rapidly at the initial stage of the spinning. The method of fabricating tubular nanofibers is called co-electrospinning. In order to analyze the possible post-processes in electrospun tubular nanofibers, the pressure distribution along the fiber is determined, which provides information about the elastic energy being stored in the fibers during evaporation as a result of their radial compression. The post-processes in electrospun tubular nanofibers are good validations for assumption regarding a residual solvent, encapsulated inside electrospun nanofibers immediately after fabrication; and this residual solvent provides a partial relaxation of the stretched polymer matrix of electrospun nanofibers. Such type of instability is called capillary or Rayleigh instability.
